Mrcool DUCT12HP230BO Olympus Ceiling Duct Air Handler User Manual

MODELS:

Read this manual carefully before installation and keep it where

the operator can easily nd it for future reference.

Due to updates and constantly improving performance, the

information and instructions within this manual are subject to

change without notice.

Version Date: May 20, 2025

Please visit www.mrcool.com/documentation

to ensure you have the latest version of this manual.

This product utilizes R-454B refrigerant

Olympus Series

Duct Air

Handlers

(9k-18K)

Service Manual

DUCT-*HP-230B-O

Table of Contents

1. Safety Precautions

1. Precautions

2. Information servicing

2. Model Reference & External Appearance

1. Model Reference

2. External Appearance

3. Indoor Unit

1. Feature

2. Dimensional Drawings

3. Part names

4. Service Place

5. Accessories

6. Fan Performance

7. Sound Pressure Levels

8. Refrigerant System Diagram

9. Electrical Characteristics

10. Electrical Wiring Diagrams

4. Installation

5. Product Features

6. Troubleshooting

1. Safety Caution

2. General Troubleshooting

3. Information Inquiry

4. Error Diagnosis and Troubleshooting Without Error Code

5. Quick Maintenance by Error Code

6. Troubleshooting by Error Code

7. Check Procedures

Appendix

i) Temperature Sensor Resistance Value Table for T1,T2,T3 and T4 (°C – K)

ii) Temperature Sensor Resistance Value Table for TP (°C – K)

iii) Pressure On Service Port

Contents

1. Precautions .............................................................................................................2

2. Information servicing(For flammable materials) .................................................4

Safety Precautions

 Safety Precautions 2 

1. Precautions

To prevent personal injury, or property or unit damage,

adhere to all precautionary measures and instructions

outlined in this manual. Before servicing a unit, refer to this

service manual and its relevant sections.

Failure to adhere to all precautionary measures listed in this

section may result in personal injury, damage to the unit or

to property, or in extreme cases, death.

WARNING indicates a potentially hazardous

situation which if not avoided could result in serious

personal injury, or death.

CAUTION indicates a potentially hazardous situation

which if not avoided could result in minor or

moderate personal injury, or unit damage.

1.1 In case of Accidents or Emergency

WARNING

• If a gas leak is suspected, immediately turn off the

gas and ventilate the area if a gas leak is suspected

before turning the unit on.

• If strange sounds or smoke is detected from the unit,

turn the breaker off and disconnect the power supply

cable.

• If the unit comes into contact with liquid, contact an

authorized service center.

• If liquid from the batteries makes contact with skin or

clothing, immediately rinse or wash the area well with

clean water.

• Do not insert hands or other objects into the air inlet

or outlet while the unit is plugged in.

• Do not operate the unit with wet hands.

• Do not use a remote controller that has previously

been exposed to battery damage or battery leakage.

CAUTION

• Clean and ventilate the unit at regular intervals when

operating it near a stove or near similar devices.

• Do not use the unit during severe weather conditions.

If possible, remove the product from the window

before such occurrences.

1.2 Pre-Installation and Installation

WARNING

• Use this unit only on a dedicated circuit.

• Damage to the installation area could cause the unit

to fall, potentially resulting in personal injury, prop-

erty damage, or product failure.

• Only qualified personnel should disassemble, install,

remove, or repair the unit.

• Only a qualified electrician should perform electri-

cal work. For more information, contact your dealer,

seller, or an authorized service center.

CAUTION

• While unpacking be careful of sharp edges around

the unit as well as the edges of the fins on the con-

denser and evaporator.

1.3 Operation and Maintenance

WARNING

• Do not use defective or under-rated circuit breakers.

• Ensure the unit is properly grounded and that a

dedicated circuit and breaker are installed.

• Do not modify or extend the power cable. Ensure

the power cable is secure and not damaged during

operation.

• Do not unplug the power supply plug during

operation.

• Do not store or use flammable materials near the

unit.

• Do not open the inlet grill of the unit during

operation.

• Do not touch the electrostatic filter if the unit is

equipped with one.

• Do not block the inlet or outlet of air flow to the unit.

• Do not use harsh detergents, solvents, or similar items

to clean the unit. Use a soft cloth for cleaning.

• Do not touch the metal parts of the unit when

removing the air filter as they are very sharp.

• Do not step on or place anything on the unit or

outdoor units.

• Do not drink water drained from the unit

• Avoid direct skin contact with water drained from the

unit.

• Use a firm stool or step ladder according to

manufacturer procedures when cleaning or

maintaining the unit.

CAUTION

• Do not install or operate the unit for an extended

period of time in areas of high humidity or in an

environment directly exposing it to sea wind or salt

spray.

• Do not install the unit on a defective or damaged

installation stand, or in an unsecure location.

• Ensure the unit is installed at a level position

• Do not install the unit where noise or air discharge

created by the outdoor unit will negatively impact the

environment or nearby residences.

• Do not expose skin directly to the air discharged by

the unit for prolonged periods of time.

• Ensure the unit do not operate in areas water or

other liquids.

• Ensure the drain hose is installed correctly to ensure

proper water drainage.

• When lifting or transporting the unit, it is

recommended that two or more people are used for

this task.

• When the unit is not to be used for an extended time,

disconnect the power supply or turn off the breaker.

 Safety Precautions 3 

WARNING For Using Flammable Refrigerant

1. Installation(where refrigerant pipes are allowed)

- Any person who is involved with working on or breaking into a

refrigerant circuit should hold a current valid certificate from an

industry-accredited assessment authority, which authorises their

competence to handle refrigerants safely in accordance with an

industry recognised assessment specification.

- Maintenance and repair requiring the assistance of other skilled

personnel shall be carried out under the supervision of the person

competent in the use of flammable refrigerants.

- That the installation of pipe-work shall be kept to a minimum.

- That pipe-work shall be protected from physical damage.

- Where refrigerant pipes shall be compliance with national gas

regulations.

- That mechanical connections shall be accessible for mainte-

nance purposes.

- Be more careful that foreign matter(oil, water,etc) does not

enter the piping.

Also, when storing the piping, securely seal the opening by

pinching, taping, etc.

- Appliance shall be stored in a well ventilated area where the

room size corresponds to the room area as specifiec for opera-

tion.

- Appliance shall be stored in a well ventilated area where the

room size corresponds to the room area as specifiec for opera-

tion.

- Joints shall be tested with detection equipment with a capability

of 5 g/year of refrigerant or better, with the equipment in stand-

still and under operation or under a pressure of at least these

standstill or operation conditions after installation. Detachable

joints shall NOT be used in the indoor side of the unit(brazed,

welded joint could be used).

- In cases that require mechanical ventilation, ventilation open-

ings shall be kept clear of obstruction.

2. When a FLAMMABLE REFRIGERANT is used, the requirements

for installation space of appliance and /or ventilation require-

ments are determined according to

- the mass charge amount(M) used in the appliance,

- the installation location,

- the type of ventilation of the location or of the appliance.

- piping material, pipe routing, and installation shall include pro-

tection from physical damage in operation and service, and be in

compliance with national and local codes and standards, such as

ASHRAE 15, IAPMO Uniform Mechanical Code, ICC International

Mechanical Code, or CSA B52. All field joints shall be acces-

sible for inspection prior to being covered or enclosed.

- that protection devices, piping, and fittings shall be protected as

far as possible against adverse environmental efects, for example,

the danger of water collecting and freezing in relief pipes or the

accumulation of dirt and debris;

- that piping in refrigeration systems shall be so designed and

installed to minimize the likelihood of hydraulic shock damaging

the system;

- that steel pipes and components shall be protected against cor-

rosion with a rustproof coating before applying any insulation;

- that precautions shall be taken to avoid excessive vibration or

pulsation;

- the minimum floor area of the room shall be mentioned in the

form of a table or a single figure without reference to a formula;

- after completion of field piping for split systems, the field pipe-

work shall be pressure tested with an inert gas and then vacuum

tested prior to refrigerant charging, according to the following

requirements:

a. The minimum test pressure for the low side of the system shall

be the low side design pressure and the minimum test pressure

for the high side of the system shall be the high side design pres-

sure, unless the high side of the system can not be isolated from

the low side of the system in which case the entire system shall

be pressure tested to the low side design pressure.

b. The test pressure after removal of pressure source shall be

maintained for at least 1 h with no decrease of pressure indicated

by the test gauge, with test gauge resolution not exceeding 5%

of the test pressure.

c. During the evacuation test, after achieving a vacuum level

specified in the manual or less, the refrigeration system shall be

isolated from the vacuum pump and the pressure shall not rise

above 1500 microns within 10 min. The vacuum pressure level

shall be specified in the manual, and shall be the lessor of 500

microns or the value required for compliance with national and

local codes and standards, which may vary between residential,

commercial,and industrial buildings.

-- field-made refrigerant joints indoors shall be tightness tested

according to the following requirements: The test method shall

have a sensitivity of 5 grams per year of refrigerant or better

under a pressure of at least 0,25 times the maximum allowable

pressure. No leak shall be detected.

-- Any servicing shall be performed only as recommended by the

manufacturer.

3. Qualification of workers

Any maintenance, service and repair operations must be required

qualification of the working personnel. Every working procedure

that afects safety means shall only be carried out by competent

persons that joined the training and achieved competence should

be documented by a certificate. The training of these procedures

is carried out by national training organizations or manufacturers

that are accredited to teach the relevant national competency

standards that may be set in legislation. All training shall follow

the ANNEX HH requirements of UL 60335-2-40 4th Edition.

Examples for such working procedures are:

• breaking into the refrigerating circuit;

• opening of sealed components;

• opening of ventilated enclosures.

 Safety Precautions 4 

2. Information servicing(For

flammable materials)

2.1 Checks to the area

• Prior to beginning work on systems containing ﬂammable

refrigerants, safety checks are necessary to ensure that the

risk of ignition is minimized. For repair to the refrigerating

system, the following precautions shall be complied with

prior to conducting work on the system.

2.2 Work procedure

• Work shall be undertaken under a controlled procedure so

as to minimise the risk of a ﬂammable gas or vapour being

present while the work is being performed.

2.3 General work area

• All maintenance staff and others working in the local area

shall be instructed on the nature of work being carried out.

Work in conﬁned spaces shall be avoided.

2.4 Checking for presence of refrigerant

• The area shall be checked with an appropriate refrigerant

detector prior to and during work, to ensure the technician

is aware of potentially ﬂammable atmospheres.

• Ensure that the leak detection equipment being used is

suitable for use with ﬂammable refrigerants, i.e. no sparking,

adequately sealed or intrinsically safe.

2.5 Presence of ﬁre extinguisher

• If any hot work is to be conducted on the refrigeration

equipment or any associated parts, appropriate ﬁre

extinguishing equipment shall be available to hand. Have

a dry powder or CO2 ﬁre extinguisher adjacent to the

charging area.

2.6 No ignition sources

• No person carrying out work in relation to a REFRIGERATING

SYSTEM which involves exposing any pipe work shall use

any sources of ignition in such a manner that it may lead

to the risk of ﬁre or explosion. All possible ignition sources,

including cigarette smoking, should be kept sufciently far

away from the site of installation, repairing, removing and

disposal, during which refrigerant can possibly be released to

the surrounding space. Prior to work taking place, the area

around the equipment is to be surveyed to make sure that

there are no ﬂammable hazards or ignition risks.

• “No Smoking” signs shall be displayed.

2.7 Ventilated area

• Ensure that the area is in the open or that it is adequately

ventilated before breaking into the system or conducting any

hot work. A degree of ventilation shall continue during the

period that the work is carried out. The ventilation should

safely disperse any released refrigerant and preferably expel

it externally into the atmosphere.

2.8 Checks to the refrigeration equipment

• Where electrical components are being changed, they shall

be ﬁt for the purpose and to the correct speciﬁcation. At all

times the manufacturer’s maintenance and service guidelines

shall be followed. If in doubt consult the manufacturer’s

technical department for assistance. The following

checks shall be applied to installations using FLAMMABLE

REFRIGERANTS:

• the actual refrigerant charge is in accordance with the

room size within which the refrigerant containing parts

are installed;

• the ventilation machinery and outlets are operating

adequately and are not obstructed;

• if an indirect refrigerating circuit is being used, the

secondary circuits shall be checked for the presence of

refrigerant;

• marking to the equipment continues to be visible and

legible, marking and signs that are illegible shall be

corrected;

• refrigeration pipe or components are installed in a

position where they are unlikely to be exposed to any

substance which may corrode refrigerant containing

components, unless the components are constructed of

materials which are inherently resistant to being corroded

or are suitably protected against being so corroded.

2.9 Checks to electrical devices

• Repair and maintenance to electrical components shall

include initial safety checks and component inspection

procedures. If a fault exists that could compromise safety,

then no electrical supply shall be connected to the circuit

until it is satisfactorily dealt with. If the fault cannot be

corrected immediately but it is necessary to continue

operation, an adequate temporary solution shall be used.

This shall be reported to the owner of the equipment so all

parties are advised.

Initial safety checks shall include:

• that capacitors are discharged: this shall be done in a safe

manner to avoid possibility of sparking;

• that there no live electrical components and wiring

are exposed while charging, recovering or purging the

system;

• that there is continuity of earth bonding.

2.10 Sealed electrical components shall be

replaced

2.11 Intrinsically safe components must be

replaced

 Safety Precautions 5 

2.12 Cabling

• Check that cabling will not be subject to wear, corrosion,

excessive pressure, vibration, sharp edges or any other

adverse environmental effects. The check shall also take

into account the effects of aging or continual vibration from

sources such as compressors or fans.

2.13 Detection of flammable refrigerants

• Under no circumstances shall potential sources of ignition be

used in the searching for or detection of refrigerant leaks. A

halide torch (or any other detector using a naked ﬂame) shall

not be used.

• The following leak detection methods are deemed

acceptable for refrigerant systems. Electronic leak detectors

may be used to detect refrigerant leaks but, in the case

of FLAMMABLE REFRIGERANTS, the sensitivity may not be

adequate, or may need re-calibration. (Detection equipment

shall be calibrated in a refrigerant-free area.) Ensure that

the detector is not a potential source of ignition and is

suitable for the refrigerant used. Leak detection equipment

shall be set at a percentage of the LFL of the refrigerant

and shall be calibrated to the refrigerant employed, and

the appropriate percentage of gas (25 % maximum) is

conﬁrmed. Leak detection ﬂuids are also suitable for use

with most refrigerants but the use of detergents containing

chlorine shall be avoided as the chlorine may react with the

refrigerant and corrode the copper pipe-work.

NOTE Examples of leak detection ﬂuids are

- bubble method,

- ﬂuorescent method agents.

• If a leak is suspected, all naked ﬂames shall be removed/

extinguished.

• If a leakage of refrigerant is found which requires brazing,

all of the refrigerant shall be recovered from the system, or

isolated (by means of shut of valves) in a part of the system

remote from the leak. See the following instructions of

removal of refrigerant.

2.14 Removal and evacuation

• When breaking into the refrigerant circuit to make repairs

or for any other purpose, conventional procedures shall be

used. However, it is important that best practice is followed

since ﬂammability is a consideration.

• The following procedure shall be adhered to:

• safely remove refrigerant following local and national

regulations;

• evacuate;

• purge the circuit with inert gas(optional for A2L);

• evacuate(optional for A2L);

• continuously ﬂush or purge with inert gas when using

ﬂame to open circuit; and open the circuit;

• The refrigerant charge shall be recovered into the correct

recovery cylinders if venting is not allowed by local and

national codes. For appliances containing ﬂammable

refrigerants, the system shall be purged with oxygen-

free nitrogen to render the appliance safe for ﬂammable

refrigerants. This process might need to be repeated several

times. Compressed air or oxygen shall not be used for

purging refrigerant systems.

• For appliances containing ﬂammable refrigerants,

refrigerants purging shall be achieved by breaking the

vacuum in the system with oxygen-free nitrogen and

continuing to ﬁll until the working pressure is achieved, then

venting to atmosphere, and ﬁnally pulling down to a vacuum

(optional for A2L). This process shall be repeated until no

refrigerant is within the system (optional for A2L). When the

ﬁnal oxygen-free nitrogen charge is used, the system shall

be vented down to atmospheric pressure to enable work to

take place.

• The outlet for the vacuum pump shall not be close to any

potential ignition sources, and ventilation shall be available.

2.15 Charging procedures

• In addition to conventional charging procedures, the

following requirements shall be followed:

• Works shall be undertaken with appropriate tools only (In

case of uncertainty, please consult the manufacturer of

the tools for use with ﬂammable refrigerants)

• Ensure that contamination of different refrigerants does

not occur when using charging equipment. Hoses or lines

shall be as short as possible to minimize the amount of

refrigerant contained in them.

• Cylinders shall be kept upright.

• Ensure that the refrigeration system is earthed prior to

charging the system with refrigerant.

• Label the system when charging is complete(if not

already).

• Extreme care shall be taken not to overﬁll the

refrigeration system.

• Prior to recharging the system it shall be pressure tested

with OFN. The system shall be leak tested on completion

of charging but prior to commissioning. A follow up

leak test shall be carried out prior to leaving the site.

2.16 Decommissioning

Before carrying out this procedure, it is essential that the

technician is completely familiar with the equipment and all its

detail. It is recommended good practice that all refrigerants are

recovered safely. Prior to the task being carried out, an oil and

refrigerant sample shall be taken in case analysis is required prior

to re-use of recovered refrigerant. It is essential that electrical

power is available before the task is commenced.

• Become familiar with the equipment and its operation.

• Isolate system electrically.

• Before attempting the procedure ensure that:

• mechanical handling equipment is available, if required,

for handling refrigerant cylinders;

• all personal protective equipment is available and being

 Safety Precautions 6 

used correctly;

• the recovery process is supervised at all times by a

competent person;

• recovery equipment and cylinders conform to the

appropriate standards.

• Pump down refrigerant system, if possible.

• If a vacuum is not possible, make a manifold so that

refrigerant can be removed from various parts of the system.

• Make sure that cylinder is situated on the scales before

recovery takes place.

• Start the recovery machine and operate in accordance with

manufacturer’s instructions.

• Do not overﬁll cylinders. (No more than 80 % volume liquid

charge).

• Do not exceed the maximum working pressure of the

cylinder, even temporarily.

• When the cylinders have been ﬁlled correctly and the process

completed, make sure that the cylinders and the equipment

are removed from site promptly and all isolation valves on

the equipment are closed off.

• Recovered refrigerant shall not be charged into another

refrigeration system unless it has been cleaned and checked.

2.17 Labelling

• Equipment shall be labelled stating that it has been de-

commissioned and emptied of refrigerant. The label shall be

dated and signed. For appliances containing FLAMMABLE

REFRIGERANTS, ensure that there are labels on the

equipment stating the equipment contains FLAMMABLE

REFRIGERANT.

2.18 Recovery

• When removing refrigerant from a system, either for

servicing or decommissioning,

• it is recommended good practice that all refrigerants are

removed safely.

• When transferring refrigerant into cylinders, ensure that

only appropriate refrigerant recovery cylinders are employed.

Ensure that the correct number of cylinders for holding the

total system charge is available. All cylinders to be used

are designated for the recovered refrigerant and labelled

for that refrigerant (i. e. special cylinders for the recovery

of refrigerant). Cylinders shall be complete with pressure-

relief valve and associated shut-of valves in good working

order. Empty recovery cylinders are evacuated and, if

possible,cooled before recovery occurs.

• The recovery equipment shall be in good working order

with a set of instructions concerning the equipment that

is at hand and shall be suitable for the recovery of the

ﬂammable refrigerant. If in doubt the manufacturer should

be consulted. In addition, a set of calibrated weighing scales

shall be available and in good working order. Hoses shall be

complete with leak-free disconnect couplings and in good

condition.

• The recovered refrigerant shall be processed according

to local legislation in the correct recovery cylinder, and

the relevant waste transfer note arranged. Do not mix

refrigerants in recovery units and especially not in cylinders.

• If compressors or compressor oils are to be removed,

ensure that they have been evacuated to an acceptable

level to make certain that ﬂammable refrigerant does not

remain within the lubricant. The compressor body shall not

be heated by an open ﬂame or other ignition sources to

accelerate this process. When oil is drained from a system, it

shall be carried out safely.

2.19 Transportation, marking and storage

for units

1. Transport of equipment containing ﬂammable refrigerants

Compliance with the transport regulations

2. Marking of equipment using signs

Compliance with local regulations

3. Disposal of equipment using ﬂammable refrigerants

Compliance with national regulations

4. Storage of equipment/appliances

The storage of equipment should be in accordance with the

manufacturer’s instructions.

5. Storage of packed (unsold) equipment

Storage package protection should be constructed such that

mechanical damage to the equipment inside the package will

not cause a leak of the refrigerant charge. The maximum number

of pieces of equipment permitted to be stored together will be

determined by local regulations.

Contents

1. Model Reference ....................................................................................................2

2 External Appearance .............................................................................................2

Model Reference

 Model Reference 2 

1. Model Reference

Indoor Unit Model

Capacity

(Btu/h)

Power Supply

Duct

1Phase, 208/230V~, 60Hz

DUCT-09HP-230B-O

DUCT-12HP-230B-O

12k

DUCT-18HP-230B-O

18k

2. External Appearance

2.1 Indoor Unit

Duct

Contents

1. Feature....................................................................................................................2

2. Dimensional Drawings ..........................................................................................4

3. Part names .............................................................................................................7

4. Service Place ...........................................................................................................7

5. Accessories .............................................................................................................8

6 Fan Performance ....................................................................................................9

7. Sound Pressure Levels .........................................................................................14

8. Refrigerant System Diagram ..............................................................................16

9. Electrical Characteristics ......................................................................................17

10. Electrical Wiring Diagrams ..................................................................................17

Indoor Unit-Duct

 IDU-A6 Duct 2 

1. Feature

1.1 Eccentric Fan Design

New eccentric fan design improves the airflow at the air outlet, resulting better performance.

1.2 Slim Design

The industry lowest height is designed to be fitted into tight roof space.

1.3 Flexible Air Intake

The frame size of air inlet in rear and bottom is the same. It’s very easy to switch to match different

applications.

 IDU-A6 Duct 3 

1.4 Built-in Drain Pump(Optional)

The built-in drain pump can lift condensing water up to 750mm.

1.5 Easy Clean

You can pull out the filter from left, right, or from the bottom for easy cleaning.

 IDU-A6 Duct 4 

2. Dimensional Drawings

Model

unit A B C C1 D E F G H I J K L M H1 H2 W1 W2

(kBtu/h)

9/12

mm 700 200 470 506 450 137 537 30 152 599 186 50 741 360 84 140 84 84

inch 27.56 7.87 18.50 19.92 17.72 5.39 21.14 1.18 5.98 23.58 7.32 1.97 29.17 14.17 3.31 5.51 3.31 3.31

mm 880 210 634 674 600 140 706 50 136 782 190 50 920 508 78 148 88 112

inch 34.65 8.27 24.96 26.54 23.62 5.51 27.80 1.97 5.35 30.79 7.48 1.97 36.22 20.00 3.07 5.83 3.46 4.41

 IDU-A6 Duct 5 

9k/12k with external condensate pump(optional)

 IDU-A6 Duct 6 

18k with external condensate pump(optional)

 IDU-A6 Duct 7 

3. Part names

Air outlet

Air inlet

Air lter(on some models)

Drain hose

Electric control box

Refrigerant connecting pipe

4. Service Place

Air outlet

Air inlet

! (20cm)

7.9

11.8in

23.6inx23.6in (60cmx60cm)

checking orifice

! (30cm)

 IDU-A6 Duct 8 

5. Accessories

The air conditioning system comes with the following accessories. Use all of the installation parts and accessories to in-

stall the air conditioner. Improper installation may result in water leakage, electrical shock and ﬁre, or equipment failure.

Name Shape Quantity

Manual

2~4

Reﬁrgenout in/out pipe protection cover 2

Copper nut 2

Wired remote controller(with packing)

Outlet pipe sheath 1

Outlet pipe clasp 2

Drain joint & Seal ring 1

Magnetic ring (for wired

controller connection)

Magnetic ring (Hitch it on the connective cable

between indoor unit and outdoor unit after

installation.)

Display panel

Remote controlle(purchase separately) 1

Dry battery(purchase separately) 2

Remote controller holder(purchase separately) 1

Optional accessories:

• There are two types of remote controls: wired and wireless.

• Select a remote controller based on customer preferences and requirements and install in an appropriate place.

• Refer to catalogues and technical literature for guidance on selecting a suitable remote controller.

 IDU-A6 Duct 9 

6. Fan Performance

100

150

200

250

300

350

400

450

500

0 0.02 0.04 0.06 0.08 0.1 0.12

Air volume CFM

External static pressure in.WC

SP1

100

150

200

250

300

350

400

450

500

0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22

Air volume CFM

External static pressure in.WC

SP2

100

150

200

250

300

350

400

450

500

0.18 0.2 0.22 0.24 0.26 0.28 0.3 0.32

Air volume CFM

External static pressure in.WC

SP3

100

150

200

250

300

350

400

450

500

0.28 0.3 0.32 0.34 0.36 0.38 0.4 0.42

Air volume CFM

External static pressure in.WC

SP4

 IDU-A6 Duct 10 

12k

100

200

300

400

500

600

0 0.02 0.04 0.06 0.08 0.1 0.12

Air volume CFM

External static pressure in.WC

SP1

100

200

300

400

500

600

0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22

Air volume CFM

External static pressure in.WC

SP2

100

200

300

400

500

600

0.18 0.2 0.22 0.24 0.26 0.28 0.3 0.32

Air volume CFM

External static pressure in.WC

SP3

100

200

300

400

500

600

0.28 0.3 0.32 0.34 0.36 0.38 0.4 0.42

Air volume CFM

External static pressure in.WC

SP4

 IDU-A6 Duct 11 

18k

100

200

300

400

500

600

700

800

0 0.02 0.04 0.06 0.08 0.1 0.12

Air volume CFM

External static pressure in.WC

SP1

100

200

300

400

500

600

700

800

0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22

Air volume CFM

External static pressure in.WC

SP2

100

200

300

400

500

600

700

800

0.18 0.2 0.22 0.24 0.26 0.28 0.3 0.32

Air volume CFM

External static pressure in.WC

SP3

100

200

300

400

500

600

700

800

0.28 0.3 0.32 0.34 0.36 0.38 0.4 0.42

Air volume CFM

External static pressure in.WC

SP4

 IDU-A6 Duct 12 

Constant air volume

100

150

200

250

300

350

0 0.04 0.08 0.12 0.16 0.2 0.24 0.28 0.32 0.36 0.4

Air volume CFM

External static pressure in.WC

12k

100

150

200

250

300

350

400

450

0 0.04 0.08 0.12 0.16 0.2 0.24 0.28 0.32 0.36 0.4

Air volume CFM

External static pressure in.WC

 IDU-A6 Duct 13 

18k

100

200

300

400

500

600

700

800

0 0.04 0.08 0.12 0.16 0.2 0.24 0.28 0.32 0.36 0.4

Air volume CFM

External static pressure in.WC

 IDU-A6 Duct 14 

7. Sound Pressure Levels

7.1 Sound pressure level

2m/6.56ft

1m/3.28ft

1.5m/4.92ft

Notes:

-Sound measured at 1.5m/4.92ft away from the center of the unit.

-Data is valid at free ﬁeld condition

-Data is valid at nominal operation condition

-Reference acoustic pressure OdB = 20µPa

-Sound level will vary depending on a range of factors such as

the construction -(acoustic absorption coefﬁcient) of particular

room

in which the equipment is installed.

-The operating conditions are assumed to be standard.

 IDU-A6 Duct 15 

7.2 NC Curves

DUCT-12HP-230B-O

DUCT-09HP-230B-O

DUCT-18HP-230B-O

 IDU-A6 Duct 16 

8. Refrigerant System Diagram

thermistor T1

(room temperature)

Refrigerant GAS pipe connection (Flare)

Distributor

indoor heat exchanger

heating

cooling

thermistor T2

Cond./Eva.temperature(Gas)

Refrigerant LIQUID pipe connection

(Flare)

 IDU-A6 Duct 17 

9. Electrical Characteristics

Indoor model

9k~18k

Power

Phase 1

Frequency And Volt 208/230V,60Hz

Minimum Circuit Ampacity A 3

Max Fuse A 15

10. Electrical Wiring Diagrams

IDU Capacity (Btu/h) IDU Wiring Diagram

9k~18k 16023000014312

Abbreviation Paraphrase

Y/G Yellow-Green Conductor

PUMP PUMP

TO CCM Comm.Bus Central Controller

T1 Indoor Room Temperature

T2 Coil Temperature of Indoor Heat Exchanger

 Wiring Diagrams 

10.1 Some connectors introduce:

ALARM ON/OFF

ALARM

OUTPUT

REMOTE

ON/OFF

A. For new fresh motor terminal port (also for Anion generator) CN43:

1. Connect the fan motor to the port, no need care L/N of the motor;

2. The output voltage is the power supply;

3. The fr

esh motor can not excess 200W or 1A, follow the smaller one;

4. The new fresh motor will be worked when the indoor fan motor work ;when the indoor fan mo-

tor stops , the new fresh motor would be stopped;

5. When the unit enters force cooling mode or capacity testing mode , the fresh motor isn’t work.

 Wiring Diagrams 

ALARM ON/OFF

ALARM

OUTPUT

REMOTE

ON/OFF

B For ALARM terminal port CN33

1. Provide the terminal port to connect ALARM, but no voltage of the terminal port , the power from

the ALARM system (not from the unit )

2. Although design voltage can support higher voltage ,but we strongly ask you connect the power

less than 24V, current less than 0.5A

3. When the unit occurs the problem , the relay would be closed , then ALARM works

RY9

JDQ-SH-112V/5A-O-T85-P37-B

+12V

ALARM

CN33

JXZ-PD2ZG-BK-A

 Wiring Diagrams 

ALARM ON/OFF

ALARM

OUTPUT

REMOTE

ON/OFF

C. For remote control (ON-OFF) terminal port CN23 and short connector of J7

1. Remove the short connector of J7 when you use ON-OFF function;

2. When remote switch off (OPEN); the unit would be off;

3. When remote switch on (CLOSE); the unit would be on;

4. When close/open the remote switch, the unit would be responded the demand within 2 seconds;

5. When the remote switch on, you can use remote controller/ wire controller to select the mode

what you want; when the remote switch off, the unit would not respond the demand from remote

controller/wire controller.

when the remote switch off, but the remote controller/wire controller are on, CP code would be

shown on the display board.

6. The voltage of the port is 12V DC, design Max. current is 5mA.

R158

0603-2001-F-1/10W-T

+12V

IC16 IC -P C817-SOP4-T

R160

0603-1002-F-1/10W-T

R163

0603-2001-F-1/10W-T

C-0603-104K50-X7R-01

+5V

IC_ON/OFF

D22

DW-1SS184-SOT23-T

D21

DW-1SS226-SOT23-T

JR10

0603-1002-F-1/10W-T

CZH-1*2P-Au-B

ON/OFF

CN23

JK-B3P3-GSnB

Reserved

JR4

0603-000-J-1/10W-T

+5V

JR5

0603-000-J-1/10W-T

GND

AHU_W

JR6 0603-000-J-1/10W-T

C83

10.2 Micro-Switch Introduce:

SW 1

1 1

1 2

3 4

FOR COOLING&HEATING OR COOLING ONLY MODE

SETTING

COOLING&HEATING COOLING ONLY

FACTORY SETTING

A. Micro-switch SW1 is for selection of mode.

Range: COOLING&HEATING, COOLING ONLY.

SW 1

3 4

3 4 3 4

3 4

1 2

3 4

MAIN

NO SLAVE

FOR MAIN-SLAVE SETTING

B.Micro-switch SW1 is for setting the master or slave unit when the unit is in twin connection.

Range: Master no slave (Normal 1 drive 1 connection), Master (2 positions without difference), Slave

1 2

SW 2

1 2

3 4

C.Micro-switch SW2 is for selection of indoor fan stop temperature (TEL0) when it is in anti-cold wind action in heating

mode.

Range: 24°C, 15°C, 8°C, according to EEROM setting (reserved for special customizing).

SW 2

3 4

1 2

3 4

D. Micro-switch SW2 is for selection of temperature compensation in heating mode. This helps to reduce the real

temperature difference between ceiling and ﬂoor so that the unit could run properly. If the height of installation is lower,

smaller value could be chosen.

Range: 6°C, 2°C, 4°C, E function (reserved for special customizing)

SW 8

3 3

1 2

3 4

FACTORY SETTING

E. Micro-switch SW8 is for selection of auto-restart function.

Range: Active, inactive

S1 + S W 8

1 2

3 4

1 2

3 4

1 2

3 4

1 2

3 4

E. Micro-switch S1 and dial-switch SW8 are for address setting when you want to control this unit by a central controller.

Range: 00-63

AUTO

5~7K

8~10K

11~14K

18K

24~28K 29~33K

36~38K

60K

C D

48~49K

55K

5 E

39~47K

F. Dial-switch ENC1: The indoor PCB is universal designed for whole series units from 5K to 60K. This ENC1 setting will

tell the main program what size the unit is.

Range: AUTO, 5-7K,8-10K,......,60K

NOTE: AUTO means the indoor unit is equipped with different outdoor units, which can automatically identify the

capacity of the outdoor uint, model, mono or multi zone and match the indoor unit parameters.

Usually there is glue on it because the switch position cannot be changed at random unless you want to use this PCB as

a spare part to use in another unit. Then you have to select the right position to match the size of the unit.

Contents

1. Location Selection

2. Indoor Unit Installation

3. Drainage Pipe Installation

4. Refrigerant Pipe Installation

5. Engineering of Insulation

6. Engineering of Electrical Wiring

Installation

 3. IDU Installation-Duct 

1. Location selection

1.1 Unit location selection can refer to

installation manual.

1.2 DO NOT install the unit in the following

locations:

• Areas with oil drilling or fracking.

• Coastal areas with high salt content in the air.

• Areas with caustic gases in the air, such as near hot

springs.

• Areas that experience power fluctuations, such as

factories

• Enclosed spaces, such as cabinets.

• Kitchens that use natural gas

• Areas with strong electromagnetic waves.

• Areas that store ﬂammable materials or gas.

• Rooms with high humidity, such as bathrooms or

laundry rooms.

• If possible, DO NOT install the unit where it is ex-

posed to direct sunlight.

2. Indoor Unit Installation

2.1 Installation place

The distance between the mounted indoor unit should

meet the speciﬁcations illlustrated in the following

diagram.

Left

side

Right

side

Strong and durable ceiling

Indoor unit

>7.9in(20cm) >11.8in(30cm)

>0.8in(2cm)

>11.8in(30cm)

>90.6in(230cm)

Floor

Service access Ceiling

(When no ceiling)

2.2 Service space

Air outlet

Air inlet

7.9in(20cm)

11.8in(30cm)

23.6inx23.6in(60cmx60cm)

checking orifice

2.3 Hang Indoor Unit

1. Please refer to the following diagrams to locate the four

positioning screw bolt hole on the ceiling. Be sure to mark

the areas where ceiling hook holes will be drilled.

Air filter

Electric control box

Capacity(kBtu/h)

Size of mounted plug( (inch/mm))

9/12 29.17/741 14.17/360

18 36.22/920 20/508

2. Install and ﬁt pipes and wires after you have ﬁnished

installing the main body. When choosing where to start,

determine the direction of the pipes to be drawn out.

Especially in cases where there is a ceiling involved, align

the refrigerant pipes, drain pipes, and indoor and outdoor

lines with their connection points before mounting the

unit..

3. Install hanging screw bolts.

1) Cut off the roof beam.

2) Strengthen the point at which the cut was made.

Consolidate the roof beam..

4. After you select an installation location,align the

refrigerant pipes, drain pipes, as well as indoor and

outdoor wires with their connection points before

mounting the unit..

5. Drill 4 holes 4”(10cm) deep at the ceiling hook positions

in the internal ceiling. Be sure to hold the drill at a 90°

angle to the ceiling.

6. Secure the bolt using the included washers and nuts.

7. Install the four suspension bolts.

8. Mount the indoor unit with at least two people to

 3. IDU Installation-Duct

lift and secure it. Insert suspension bolts into the unit’s

hanging holes. Fasten them using the washers and nuts

provided.

9. Mount the indoor unit onto the hanging screw bolts

with a block. Position the indoor unit ﬂat using a level

indicator to prevent leaks.

Screw nut

Washer

Hanging screw bolt

Overhang part

Shockproof cushion

Note: Conﬁrm the minimum drain tilt is 1/100 or more.

2.4 Duct and accessories installation

1. Install the ﬁlter(optional) according to air inlet size.

2. Install the canvas tie-in between the body and duct.

3. The air inlet and air outlet duct should be far enough

apart enough to a avoid air passage short-circuit.

4. Connect the duct according to the following diagram.

Canvas tie-in Canvas tie-in

Air outlet

Isolation booth

checking orifice

Air inlet

Air dust filter

5. For DC motor models, you can change the fan motor

static pressure according to external duct static pressure.

NOTE: 1. Do not put the connecting duct weight on the

indoor unit.

2. When connecting the duct, use an nonﬂammable

canvas tie-in to prevent vibrating.

3. When connecting duct, install in place prone to

takedown for maintenance.

4. Change the fan motor static pressure corresponding to

external duct static pressure.

5. If installed in place like meeting room where noise is

easy to be perceived, design isolation booth and internal

duct underlayer to mufﬂe the duct system and weaken the

air encounter noise in the duct.

2.5 Filter installation

1. Take off ventilation panel and ﬂange,

Air return flange

Ventilation panel

Bend the rear ventilation panel 90 degrees along the

dotted line into a descending ventilation panel.(some

models)

2. Change the mounting positions of ventilation panel and

air return flange .

Air return flange

Ventilation panel

3. When installing the ﬁlter mesh, ﬁt it into the ﬂange as

illustrated in the following ﬁgure.

 3. IDU Installation-Duct 

Air return flange

Ventilation panel

NOTE: All the ﬁgures in this manual are for demonstration

purposes only. The air conditioner you have purchased may

be slightly different in design, though similar in shape.

2.6 Fresh air duct installation

Dimension :

Duct joint for fresh air

6k/9k/12k

Ø92mm(3.62”)

Ø113mm(4.45”)

18k

125mm(4.92”)

160mm(6.3”)

2.7 Horizontal Installation

1 With Built-in pump (standard for 9k/12k/18k models)

Drain connector A, B & C are covered with caps originally.

Connect the drainpipe to the connector D.

Connector

Connector D

Connector B Connector C

2 With External pump (optional for 9k/12k models only)

Cut both ends of the rubber hose into a straight one, use

it to connect the drain Connector A and the external

pump and safety it with clamps on both ends. Then

connect the drainpipe to the Connector B.

Connector A

Connector

rubber hose

Clamps

Pump port

3 With External pump (optianl for 18k model only)

Drain connector A, B & C are covered with caps originally.

Take the cap on drain connector B off, connect the

external pump to drain connector B using a hose & two

hoseclamps. Then connect the drainpipe to the connector

Connector

Connector B

Connector C

Connector

Hose

 3. IDU Installation-Duct

Plug the external pump to the “PUMP” pin and the water

level sensor to the “CN5” to enable the pump.

Short connect the “CN5”

Unplug the “PUMP” pin

Remove the

cover

Fig. 1

2.8 Vertical Installation

1 No need pump (Disable pump)

The pump must be disabled while the unit is installed

vertically or the pump assembly is removed from its

original position.

Open the cover of E-Parts Box assembly, unplug the

“PUMP” pin to disable the pump function, and short

connect ”CN5” plug to disable the water level sensor. (see

Fig. 1)

2 Drain pipe connecting

When installed vertically (up ﬂow), the pump must be

disabled ﬁrstly. Follow the 2.8.1 steps to disable the

pump. For the unit with external pump, the whole

pump assembly can be removed. Then take the cap on

drain connector off and connect the drainpipe to drain

connector .

Connect the natural

drain at this location

Remove this part

6k/9k/12k models

Remove this part

Connect the natural

drain at this location

Remove the cap

Istall the cap

18k model

3. Drainage Pipe Installation

The drainpipe is used to drain water away from the unit.

Improper installation may cause unit and property damage.

CAUTION:

• Insulate all piping to prevent condensation, which could

lead to water damage.

• If the drainpipe is bent or installed incorrectly, water may

leak and cause a water-level switch malfunction.

• In HEAT mode, the outdoor unit will discharge water.

Ensure that the drain hose is placed in an appropriate area

to avoid water damage and slippage.

• DO NOT pull the drainpipe forcefully. This could

disconnect it.

NOTE ON PURCHASING PIPES:

Installation requires a polyethylene tube(exterior

diameter =1.46-1.54in/3.7-3.9cm, interior diameter

= 1.26in/3.2cm), which can be obtained at your

localhardware store or dealer.

NOTE ON DRAINPIPE INSTALLATION:

• When using an extended drainpipe, tightenthe indoor

connection with an additionalprotection tube. This

prevents it from pulling loose.

• The drainpipe should slope downward at a gradient of at

least 1/100 to prevent water from ﬂowing back into the air

conditioner.

 3. IDU Installation-Duct 

• To prevent the pipe from sagging, space hanging wires

every 39-59in(1-1.5m).

• If the outlet of the drainpipe is higher than the body’s

pump joint, use a lift pipe for the indoor unit’s exhaust

outlet. The lift pipe must be installed no higher than 21.7in

(55cm) from the ceiling board. The distance between

the unit and the lift pipe must be less than 7.9in (20cm).

Incorrect installation could cause water to ﬂow back into

the unit and ﬂood.

• To prevent air bubbles, keep the drain hose level or

slightly tiled up (<3in/75mm).

Install the drainpipe as illustrated in the following

Figure.

1.Cover the drainpipe with heat insulation to prevent

condensation and leakage.

2.Attach the mouth of the drain hose to the unit’s outlet

pipe. Sheath the mouth of the hose and clip it ﬁrmly with

a pipe clasp.

rainpipe

connecting port

Drain hose

Pipe clasp

Insulation

Lean over 1/50

Ceiling

39-59in

(1-1.5m)

3. Pass the drain hose through the wall hole.

Make sure the water drains to a safe location

where it will not cause water damage or a

slipping hazard.

NOTE: The drainpipe outlet should be at least

1.9in (5cm) above the ground. If it touches

the ground, the unit may become blocked and

malfunction. If you discharge the water directly

into a sewer, make sure that the drain has a U or

S pipe to catch odors that might otherwise come

back into the house.

Drainpipe installation for units with a pump

a Metal clamp (accessory)

b Drain hose (accessory)

c Rising drain piping (vinyl pipe of 0.98in(25mm) nominal diameter

and 1.26in(32mm) outer diameter) (field supply)

d Hanging bars (field supply)

(in/mm)

27.6in(700mm)

Air vent

11.8in(300mm)

39.4~59.1in

(1000~1500mm)

0~3.0in

(0~75mm)

NOTE: When connecting multiple drainpipes, install the

pipes as illustrated.

Units with a pump

0-700mm

Air vents are not allowed

in lifting section

Air vent (Each indoor

unit must have a vent)

Air vent

Incline 1/50

(27.6’’)

Air vent

Drainage test

Check whether the drainpipe is unhindered.

This test should be performed on newly built houses

before the ceiling is paved.

Units with a pump.

1.Remove the test cover.

Fill the water pan with 2 liters of water.

Stow tube

2.Turn on the unit in COOLING mode. You will hear

the drain pump.Check whether the water is discharged

properly (a 1-minute lag is possible, depending on the

length of the drain pipe), Check whether water leaks from

the joints.

3.Turn off the air conditioner and put the cap back on.

 4. Refrigerant Pipe Installation 

4. Refrigerant Pipe Installation

4.1 Recommended copper pipe thickness

Pipe diameter

(inch(mm))

Thickness(inch/mm)

Ø1/4 (Ø6.35) 0.024/0.6

Ø3/8 (Ø9.52) 0.028/0.7

Ø1/2 (Ø12.7) 0.03/0.75

Ø5/8 (Ø15.9) 0.03/0.75

Ø3/4 (Ø19) 0.031/0.8

Ø7/8 (Ø22) 0.039/1

4.2 Maximum length and drop height

Ensure that the length of the refrigerant pipe, the number

of bends, and the drop height between the indoor and

outdoor units meets the requirements shown in the

following table.

Capacity (Btu/h)

Max. Length

(ft/m)

Max. Elevation

(ft/m)

12k 82/25 49.2/15

18k 98.4/30 65.6/20

24k 164/50 82/25

36k/48k/60k 246/75 98.4/30

Caution:

1. The capacity test is based on the standard length and

the maximum permissive length is based on the system

reliability.

2. Oil traps

-If oilﬂowsbackintotheoutdoorunit’scompressor,this

might cause liquid compression or deterioration of oil

return. Oiltrapsintherising gaspipingcanpreventthis.

-An oil trap should be installed every 20ft(6m) of vertical

suction line riser (<36k Btu/h unit).

-An oil trap should be installed every 32.8ft(10m) of

vertical suction line riser (≥36k Btu/h unit).

10m/32.8ft (≥36000Btu/h unit)

6m/20ft (＜36000Btu/h unit)

10m/32.8ft (≥36000Btu/h unit)

6m/20ft (＜36000Btu/h unit)

Indoor unit/

Outdoor unit

Indoor unit/

Outdoor unit

4.3 The procedure of connecting pipes

1. Choose the pipe size according to the speciﬁcation

table.

2. Conﬁrm the cross way of the pipes.

3. Measure the necessary pipe length.

4. Cut the selected pipe with pipe cutter

• Make the section flat and smooth.

Oblique Rough Warpe

5. Insulate the copper pipe

• Before test operation, the joint parts should not be

heat insulated.

6. Flare the pipe

• Insert a flare nut into the pipe before flaring the

pipe

• According to the following table to flare the pipe.

 4. Refrigerant Pipe Installation 

Pipe diameter

(inch(mm))

Flare dimension A

(inch/mm)

Flare shape

Min Max

Ø1/4 (Ø6.35) 0.33/8.4 0.34/8.7

R0.4~0.8

Ø3/8 (Ø9.52) 0.52/13.2 0.53/13.5

Ø1/2 (Ø12.7) 0.64/16.2 0.65/16.5

Ø5/8 (Ø15.9) 0.76/19.2 0.78/19.7

Ø3/4 (Ø19) 0.91/23.2 0.93/23.7

Ø7/8 (Ø22) 1.04/26.4 1.06/26.9

• After flared the pipe, the opening part must be seal

by end cover or adhesive tape to avoid duct or exog-

enous impurity come into the pipe.

7. Drill holes if the pipes need to pass the wall.

8. According to the ﬁeld condition to bend the pipes so

that it can pass the wall smoothly.

9. Bind and wrap the wire together with the insulated pipe

if necessary.

10. Set the wall conduit.

11. Set the supporter for the pipe.

12. Locate the pipe and ﬁx it by supporter.

• For horizontal refrigerant pipe, the distance be-

tween supporters should not be exceed 1m.

• For vertical refrigerant pipe, the distance between

supporters should not be exceed 1.5m.

13. Connect the pipe to indoor unit and outdoor unit by

using two spanners.

• Be sure to use two spanners and proper torque to

fasten the nut, too large torque will damage the

bellmouthing, and too small torque may cause

leakage. Refer the following table for different pipe

connection.

Pipe diameter

(inch(mm))

Torque

Sketch map

m(lb.ft)

Ø1/4 (Ø6.35)

18~20

(13.3~14.8)

Ø3/8 (Ø9.52)

32~39

(23.6~28.8)

Ø1/2 (Ø12.7)

49~59

(36.1~43.5)

Ø5/8 (Ø15.9)

57~71

(42~52.4)

Ø3/4 (Ø19)

67~101

(49.4~74.5)

Ø7/8 (Ø22)

85-110

(62.7-81.1)

NOTE: MINIMUM BEND RADIUS

Carefully bend the tubing in the middle according to the

diagram below.

DO NOT bend the tubing more than 90°or more than 3

times.

Use appropriate tool

min-radius 10cm(3.9 )

 4. Refrigerant Pipe Installation 

• Be sure not bind the insulation material over-tight, it

may extrude out the air in the material to cause bad

insulation and cause easy aging of the material.

5.2 Insulation of drainage pipe

1. Operational procedure of refrigerant pipe

insulation

Select the suitable pipe → insulation (except joint section)

→ piping layout and connection→ drainage test→ insulate

the joint parts

2. Purpose of drainage pipe insulation

The temperature of condensate drainage water is very low.

If insulation is not enough, it shall form dew and cause

leakage to damage the house decoration.

3. Insulation material selection for drainage pipe

• The insulation material should be flame retardant

material, the flame retardancy of the material should

be selected according to the local law.

• Thickness of insulation layer is usually above

10mm/0.39in.

• Use specific glue to paste the seam of insulation ma-

terial, and then bind with adhesive tape. The width

of tape shall not be less than 5cm/1.97in. Make sure

it is firm and avoid dew.

4. Installation and highlights of insulation

construction

• The single pipe should be insulated before connect-

ing to another pipe, the joint part should be insu-

lated after the drainage test.

• There should be no insulation gap between the

insulation material.

5 . Engineering of Insulation

5.1 Insulation of refrigerant pipe

1. Operational procedure of refrigerant pipe

insulation

Cut the suitable pipe → insulation (except joint section) →

ﬂare the pipe → piping layout and connection→ vacuum

drying → insulate the joint parts

2. Purpose of refrigerant pipe insulation

• During operation, temperature of gas pipe and

liquid pipe shall be over-heating or over-cooling

extremely. Therefore, it is necessary to carry out in-

sulation; otherwise it shall debase the performance

of unit and burn compressor.

• Gas pipe temperature is very low during cooling.

If insulation is not enough, it shall form dew and

cause leakage.

• Temperature of gas pipe is very high (generally

50-100°C/122-212°F) during heating. Insulation

work must be carried out to prevent hurt by care-

lessness touching.

3. Insulation material selection for refrigerant pipe

• The burning performance should over 120°C/248°F

• According to the local law to choose insulation

materials

• Recommended insulation casing thickness

Humidity<80%RH Humidity ≥80%RH

10mm/0.39in 15mm/0.59in

4. Installation highlights of insulation construction

• Gas pipe and liquid pipe shall be insulated sepa-

rately, if the gas pipe and liquid pipe were insulated

together; it will decrease the performance of air

conditioner.

• The insulation material at the joint pipe shall be

5~10cm/1.97~3.97in longer than the gap of the

insulation material.

• The insulation material at the joint pipe shall be

inserted into the gap of the insulation material.

• The insulation material at the joint pipe shall be

banded to the gap pipe and liquid pipe tightly.

• The linking part should be use glue to paste to-

gether

 6. Engineering of Electrical Wring 

6. Engineering of Electrical Wring

1. Highlights of electrical wiring installation

• All field wiring construction should be finished by

qualified electrician.

• Air conditioning equipment should be grounded ac-

cording to the local electrical regulations.

• Current leakage protection switch should be in-

stalled.

• Do not connect the power wire to the terminal of

signal wire.

• When power wire is parallel with signal wire, put

wires to their own wire tube and remain at least

300mm/11.8in gap.

• According to table in indoor part named “the speci-

fication of the power” to choose the wiring, make

sure the selected wiring not small than the date

showing in the table.

• Select different colors for different wire according to

relevant regulations.

• Do not use metal wire tube at the place with acid or

alkali corrosion, adopt plastic wire tube to replace it.

• There must be not wire connect joint in the wire

tube If joint is a must, set a connection box at the

place.

• The wiring with different voltage should not be in

one wire tube.

• Ensure that the color of the wires of outdoor and

the terminal No. are same as those of indoor unit

respectively.

Table: Minimum Cross-Sectional Area able of Power and

Signal Cables

Rated Current of

Appliance (A)

AWG

≤ 6 18

6 - 10 16

10 - 16 14

16 - 25 12

25 - 32 10

Contents

1. Display Function ....................................................................................................2

2 Safety Features ......................................................................................................3

3. Basic Functions .......................................................................................................4

3.1 Table .............................................................................................................4

3.2 Abbreviation ..................................................................................................5

3.3 Fan Mode ......................................................................................................5

3.4 Cooling Mode ...............................................................................................5

3.5 Heating Mode(Heat Pump Units) ...................................................................6

3.6 Auto-mode ....................................................................................................6

3.7 Drying Mode .................................................................................................7

3.8 Forced Operation Function ............................................................................7

3.9 Timer Function ..............................................................................................7

3.10 Sleep Function ...............................................................................................7

3.11 Auto-Restart Function ....................................................................................7

3.12 8°C Heating(Heat pump units) .......................................................................7

3.13 Follow me .....................................................................................................8

4. Optional Functions ................................................................................................9

5. Using the wire controller to set external static pressure ................................10

6. Using the wire controller to set airﬂow rate .....................................................10

Product Features

 Product Features 2 

1. Display Function

Duct Type

 Product Features 3 

2. Safety Features

Compressor three-minute delay at restart

Compressor functions are delayed for up to ten seconds

upon the ﬁrst startup of the unit, and are delayed for up

to three minutes upon subsequent unit restarts.

Automatic shutoff based on discharge temperature

If the compressor discharge temperature exceeds a certain

level for nine seconds, the compressor ceases operation.

Inverter module protection

The inverter module has an automatic shutoff mechanism

based on the unit’s current, voltage, and temperature.

If automatic shutoff is initiated, the corresponding error

code is displayed on the indoor unit and the unit ceases

operation.

Indoor fan delayed operation

• When the unit starts, the louver is automatically

activated and the indoor fan will operate after a period

of setting time or the louver is in place.

• If the unit is in heating mode, the indoor fan is

regulated by the anti-cold wind function.

Compressor preheating

Preheating is automatically activated when T4 sensor is

lower than setting temperature.

Sensor redundancy and automatic shutoff

• If one temperature sensor malfunctions, the air

conditioner continues operation and displays the

corresponding error code, allowing for emergency use.

• When more than one temperature sensor is

malfunctioning, the air conditioner ceases operation.

 Product Features 4 

3. Basic Functions

3.1 Table

Functions Auto mode

Cases Case 1 Case 2 Case 3

Models

9k~18k

Note: The detailed description of case 1 or case 2 is shown in the following function sections(from 3.4 to 3.6).

 Product Features 5 

3.2 Abbreviation

Unit element abbreviations

Abbreviation Element

T1 Indoor room temperature

Coil temperature of evaporator

T3 Coil temperature of condenser

T4 Outdoor ambient temperature

TP Compressor discharge temperature

Tsc Adjusted setting temperature

CDIFTEMP Cooling shutdown temperature

HDIFTEMP2 Heating shutdown temperature

In this manual, such as CDIFTEMP, HDIFTEMP2...etc., they

are well-setting parameter of EEPROM.

3.3 Fan Mode

When fan mode is activated:

• The outdoor fan and compressor are stopped.

• Temperature control is disabled and no temperature

setting is displayed.

• The indoor fan speed can be set to 1%~100% and

auto.

• The louver operations are identical to those in cooling

mode.

• Auto fan: In fan-only mode, AC operates the same as

auto fan in cooling mode with the temperature set at

24°C(75°F).

3.4 Cooling Mode

3.4.1 Indoor Fan Control

1) In cooling mode, the indoor fan operates continuously.

The fan speed can be set to 1%-100%, or low,

medium, high and auto.

2) Auto fan action in cooling mode:

• Descent curve

• When T1-Tsc is lower than to 3.5°C/6.3°F, fan speed

reduces to 80%;

• When T1-Tsc is lower than to 1°C/1.8°F,, fan speed

reduces to 60%;

• When T1-Tsc is lower than to 0.5°C/0.9°F, fan speed

reduces to 40%;

• When T1-Tsc is lower than to 0°C/0°F, fan speed

reduces to 20%;;

• When T1-Tsc is lower than to -0.5°C/-0.9°F, fan

speed reduces to 1%;.

• Rise curve

• When T1-Tsc is higher than or equal 0°C/0°F, fan

speed increases to 20%;;

• When T1-Tsc is higher than or equal 0.5°C/0.9°F,

fan speed increases to 40%;

• When T1-Tsc is higher than or equal 1°C/1.8°F,, fan

speed increases to 60%;

• When T1-Tsc is higher than or equal 1.5°C/2.7°F,

fan speed increases to 80%;

• When T1-Tsc is higher than or equal 4°C/7.2°F, fan

speed increases to 100%.

3.4.2 Condenser Temperature Protection

When the condenser temperature exceeds a conﬁgured

value, the compressor ceases operation.

3.4.5 Evaporator Temperature Protection

• Off: Compressor stops.

• Decrease: Decrease the running frequency to the lower

level per 1 minute.

• Hold: Keep the current frequency.

• Resume: No limitation for frequency.

3.5 Heating Mode(Heat Pump Units)

3.5.1 Indoor Fan Control:

1) In heating mode, the indoor fan operates continuously.

The fan speed can be set to 1%-100% and auto.

• Anti-cold air function

 Product Features 6 

• If the temperature difference of T2 changes during

auto fan and causes the fan speed to change,

run the current fan speed for 30 seconds ﬁrst,

the default interval is the interval before the fan

speed changes, and then judge T2 according to the

current interval after 30 seconds to get the ﬁnal

anti-cold air interval.

ΔTE1=0

2) Auto fan action in heating mode:

• Rise curve

• When T1-Tsc is higher than -1.5°C/-2.7°F,, fan

speed reduces to 80%;

• When T1-Tsc is higher than 0°C/0°F, fan speed

reduces to 60%;

• When T1-Tsc is higher than 0.5°C/0.9°F, fan speed

reduces to 40%;

• When T1-Tsc is higher than 1°C/1.8°F, fan speed

reduces to 20%.

• Descent curve

• When T1-Tsc is lower than or equal to 0.5°C/0.9°F,

fan speed increases to 40%;

• When T1-Tsc is lower than or equal to 0°C/0°F, fan

speed increases to 60%;

• When T1-Tsc is lower than or equal to -1.5°C/-

2.7°F,, fan speed increases to 80%;

• When T1-Tsc is lower than or equal to -3°C/-5.4°F,

fan speed increases to 100%.

3.5.2 Evaporator Coil Temperature Protection

• Off: Compressor stops.

• Decrease: Decrease the running frequency to the lower

level per 20 seconds.

• Hold: Keep the current frequency.

• Resume: No limitation for frequency.

3.6 Auto-mode

• This mode can be selected with the remote controller

and the temperature setting can be adjusted between

16°C~30°C.

Case 1:

• In auto mode, the machine selects cooling, heating, or

fan-only mode on the basis of ∆T (∆T =T1-TS).

∆T Running mode

∆T>2°C(3.6°F) Cooling

-3℃(-5.4°F)≤∆T≤2°C(3.6°F) Fan-only

∆T<-3°C(-5.4°F) Heating*

Heating*: In auto mode, cooling only models run the fan

• Indoor fan will run at auto fan speed.

• The louver operates same as in relevant mode.

• If the machine switches mode between heating and

cooling, the compressor will keep stopping for certain

time and then choose mode according to ∆T.

Case 2:

In auto mode, the machine selects cooling, heating or

fan-only mode on the basis of T1,Ts and Outdoor ambient

temperature(T4).

Case 3:

In auto mode, the machine selects cooling, heating or

 Product Features 7 

fan-only mode on the basis of T1,Ts, Outdoor ambient

temperature(T4) and relative humidity(φ).

3.7 Drying mode

• In drying mode, AC operates the same as auto fan in

cooling mode.

• All protections are activated and operate the same as

they do that in cooling mode.

• Low Room Temperature Protection

If the room temperature is lower than 10°C/50°F, the

compressor ceases operations and does not resume until

room temperature exceeds 12°C/53.6°F.

3.8 Forced operation function

Press the AUTO/COOL button, the AC will run as below

sequence:

Forced auto →Forced cooling →Off

• Forced cooling mode:

The compressor and outdoor fan continue to run and

the indoor fan runs at breeze speed. After running for 30

minutes, the AC will switch to auto mode with a preset

temperature of 24°C(76°F).

• Forced auto mode:

Forced auto mode operates the same as normal auto mode

with a preset temperature of 24°C(76°F).

• The unit exits forced operation when it receives the

following signals:

• Switch off

• Changes in:

• mode

• fan speed

• sleep mode

• Follow me

3.9 Timer Function

• The timing range is 24 hours.

• Timer On. The machine turns on automatically at the

preset time.

• Timer Off. The machine turns off automatically at the

preset time.

• Timer On/Off. The machine turns on automatically at

the preset On Time, and then turns off automatically

at the preset Off Time.

• Timer Off/On. The machine turns off automatically at

the preset Off Time and then turns on automatically at

the preset On Time.

• The timer does not change the unit operation mode.

If the unit is off now, it does not start up immediately

after the “timer off” function is set. When the setting

time is reached, the timer LED switches off and the

unit running mode remains unchanged.

• The timer uses relative time, not clock time

3.10 Sleep function

• The sleep function is available in cooling, heating, or

auto mode.

• The operational process for sleep mode is as follows:

• When cooling, the temperature rises 1°C/1.8°F

(to not higher than 30°C/86°F) every hour. After 2

hours, the temperature stops rising and the indoor

fan is ﬁxed at low speed.

• When heating, the temperature decreases

1°C/1.8°F(to not lower than 16°C/60.8°F) every

hour. After 2 hours, the temperature stops

decreasing and the indoor fan is ﬁxed at low speed.

Anti-cold wind function takes priority.

• The operating time for sleep mode is 8 hours, after

which, the unit exits this mode.

• The timer setting is available in this mode.

3.11 Auto-Restart function

• The indoor unit has an auto-restart module that

allows the unit to restart automatically. The module

automatically stores the current settings and in the

case of a sudden power failure, will restore those

setting automatically within 3 minutes after power

returns.

3.12 8°C Heating(Heat pump units)

In heating mode, the temperature can be set to as low

as 8°C, preventing the indoor area from freezing if

unoccupied during severe cold weather.

 Product Features 8 

3.13 Follow me

• Once the follow me function is active, the remote

control will send a signal every 3 minutes, with no

beeps. The unit automatically sets the temperature

according to the measurements from the remote

control.

• The unit will only change modes if the information

from the remote control makes it necessary, not from

the unit’s temperature setting.

• If the unit does not receive a signal for 7 minutes or

you press “Follow Me,” the function turns off. The

unit regulates temperature based on its own sensor

and settings.

 Product Features 9 

4. Optional Functions

4.1 Silence(Multi-Zone Systems do not

have this function)

• Press “Silence” or keep pressing Fan button for more

than 2 seconds on the remote control to enable the

SILENCE function. While this function is active, the

compressor frequency is maintained at a lower level

than F3. The indoor unit will run at faint breeze(1%),

which reduces noise to the lowest possible level.

• When match with multi outdoor unit, this function is

disabled.

4.2 ECO Function(Multi-Zone Systems do

not have this function)

• Used to enter the energy efﬁcient mode.

• Under cooling mode, press ECO button, the remote

controller will adjust the temperature automatically

to 24°C/75°F, fan speed of Auto to save energy (but

only if the set temperature is less than 24°C/75°F).

If the set temperature is more than 24°C/75°F and

30°C/86°F, press the ECO button, the fan speed will

change to Auto, the set temperature will remain

unchanged.

• When pressing the ECO button, or modifying the

mode or adjusting the set temperature to less than

24°C/75°F, the AC will quit the ECO operation.

• Operation time in ECO mode is 8 hours. After 8 hours

the AC quits this mode.

4.3 Electrical energy consumption control

function(Multi-Zone Systems do not

have this function)

Press the “Gear” button on remote controller to enter the

energy efﬁcient mode in a sequence of following:

Turn off the unit or activate ECO, sleep, Super cool,

8°C Heating, Silence or self clean function will quit this

function.

4.4 Active Clean function (Multi-Zone

Systems do not have this function)

• The Active Clean Technology washes away dust, mold,

and grease that may cause odors when it adheres to

the heat exchanger by automatically freezing and then

rapidly thawing the frost. The internal wind wheel

then keeps operating to blow-dry the evaporator, thus

preventing the growth of mold and keeping the inside

clean.

• When this function is turned on, the indoor unit

display window appears “CL”, after 20 to 45 minutes,

the unit will turn off automatically and cancel Active

Clean function.

 Product Features 10 

5. Using the wired controller to set

external static pressure

• You can use the unit’s automatic airﬂow adjustment

function to set external static pressure.

• Automatic airﬂow adjustment is the volume of blow-

off air that has been automatically adjusted to the

quantity rated.

1. Make sure the test run is done with a dry coil. If the coil

is not dry, run the unit for 2 hours in FAN ONLY mode to

dry the coil.

2. Check that both power supply wiring and duct

installation have been completed. Check that any closing

dampers are open. Check that the air ﬁlter is properly

attached to the air suction side passage of the unit.

3. If there is more than one air inlet and outlet, adjust

the dampers so that the airﬂow rate of each air inlet and

outlet conforms with the designed airﬂow rate. Make sure

the unit is in FAN ONLY mode. Press and set the airﬂow

adjustment button on the remote control to change the

airﬂow rate from H or L.

4. Set the parameters for automatic airﬂow adjustment.

When the air conditioning unit is off, perform the

following steps:

- When the unit is turned off, hold the MODE button

and FAN button down together for three seconds.

(“AF” indicator ﬂashes for 3 times.)(for 12B wired

controller) or long press COPY button for 3 seconds(for

120X/120G/120C/120M/120N wired controller).

- Press “

△

” or “

▽

” to select the AF.

- Press “MODE”. The air conditioning unit will then start

the fan for airﬂow automatic adjustment.

After 3 to 6 minutes, the air conditioning unit stops

operating once automatic airﬂow adjustment has ﬁnished.

Caution: DO NOT adjust the dampers when automatic

airﬂow adjustment is active.

Caution:

• If there is no change after airﬂow adjustment in the

ventilation paths, be sure to reset automatic airﬂow

adjustment.

• If there is no change to ventilation paths after airﬂow

adjustment,contact your dealer, especially if this occurs

after testing the outdoor unit or if the unit has been

moved to a different location.

• Do not use automatic airﬂow adjustment with remote

control,if you are using booster fans, outdoor air

processing unit, or a HRV via duct.

• If the ventilation paths have been changed, reset airﬂow

automatic adjustment as described from step 3 onwards.

For 120L/120K wired controller, perform the following

steps:

- In power-on or standby mode, long press ON/OFF and

FAN together for 7 seconds to engineer mode

- Press “

△

” or “

▽

” to select the channel “8”.

- Press “On/Off” for 2s to enter the Static Pressure

Selector, the code displayed is “Ch”.

- Press “

△

” or “

▽

” to select the AF.

- Press “Conﬁrm” to conﬁrm.

- Press “On/Off” for 2s to exit.

6. Using the wired controller to set

airflow rate

When the air conditioning unit is off, perform the

following steps:

1. Press“MODE” and “FAN” for 3 seconds(for 12B wired

controller) or long press COPY button for 3 seconds(for

120X/120G/120C/120M/120N wired controller).

2. Press “

△

” or “

▽

” to select the SP.

3. Press “MODE” to set the airﬂow rate in the range of

0~4.

“0”: No airﬂow change

 Product Features 11 

“1”~”4”:Airﬂow increase progressively

4. Press “

△

” or “

▽

” to conﬁrm airﬂow rate.(for 120

series wired remote controller, Press “conﬁrm” to conﬁrm

airﬂow rate).

5. Press “ON/OFF” or do not touch the button for 6

minutes to exit the airﬂow setting.

6. Shut off the power supply and then turn it on.

For 120L/120K wired controller, perform the following

steps:

- In power-on or standby mode, long press ON/OFF and

FAN together for 7 seconds to engineer mode

- Press “

△

” or “

▽

” to select the channel “8”.

- Press “On/Off” for 2s to enter the Static Pressure

Selector, the code displayed is “Ch”.

- Press “

△

” or “

▽

” to select the 0~4.

- Press “Conﬁrm” to conﬁrm.

- Press “On/Off” for 2s to exit.

Contents

Troubleshooting

1. Safety Caution ............................................................................................. 3

2. General Troubleshooting .............................................................................. 4

2.1 Error Display (Indoor Unit) ......................................................................................... 4

2.2 Error Display on Two Way Communication Wired Controller ..................................... 5

3. Engineering Mode ........................................................................................ 6

3.1 Information Inquiry ................................................................................................... 6

3.2 Advanced Function Setting ....................................................................................... 9

4. Error Diagnosis and Troubleshooting Without Error Code ........................ 12

4.1 Remote maintenance ................................................................................................ 12

4.2 Field maintenance ..................................................................................................... 13

5. Quick Maintenance by Error Code ............................................................... 18

6. Troubleshooting by Error Code .................................................................... 19

6.1 EH00/ EH0A / EC51 (EEPROM Malfunction Error Diagnosis and Solution) ................. 19

6.2 EL01 (IDU & ODU communication error Diagnosis and Solution) ................................ 20

6.3 EH03 / EC07 (Fan Speed Out of Control Diagnosis and Solution) ............................... 23

6.4 EH60/EH61/EC53/EC52/EC54/EC56 (Open Circuit or Short Circuit of Temperature Sensor

Diagnosis and Solution) ............................................................................................ 26

6.5 EL0C (System lacks refrigerant Diagnosis and Solution) ............................................. 26

6.6 EH0E(Water-Level Alarm Malfunction Diagnosis and Solution) ................................... 28

6.7 PC00(ODU IPM module protection Diagnosis and Solution) ....................................... 29

6.8 PC01(ODU voltage protection Diagnosis and Solution) ............................................ 30

6.9 PC04(Inverter compressor drive error Diagnosis and Solution) .................................... 31

Contents

Troubleshooting

6.10 PC03(Pressure protection (low or high pressure) Diagnosis and Solution) ................... 32

6.11 PC02(Compressor top (or IPM) temp. proteciton Diagnosis and Solution) .................. 35

6.12 PC0L (Low ambient temperature protection) ............................................................. 36

6.13 EH b3 (Communication malfunction between wire and master control) Diagnosis and Solution

6.14 EH bA(Communication error between the indoor unit and the external fan module)/

EH3A(External fan DC bus voltage is too low protection)/ EH3b(External fan DC bus voltage is too

high fault) diagnosis and solution .............................................................................. 38

6.15 FHCC(Refrigerant sensor error) or EHC3(Refrigerant sensor is out of range) diagnosis and solution

6.16 EHC1(Refrigerant sensor detects leakage) or EHC2(Refrigerant sensor is out of range and leakage

is detected) diagnosis and solution ............................................................................ 40

6.17 EL11 (Communication malfunction between main unit and secondary units(for twins system)

Diagnosis and Solution) ............................................................................................. 41

6.18 EH12 (Main unit or secondary units malfunction(for twins system) ) Diagnosis and Solution) 41

7. Check Procedures .................................................................................................42

 Troubleshooting 3 

1. Safety Caution

WARNING

Be sure to turn off all power supplies or disconnect all wires to avoid electric shock.

While checking indoor/outdoor PCB, please equip oneself with antistatic gloves or wrist

strap to avoid damage to the board.

WARNING

Electricity remains in capacitors even when the power supply is off.

Ensure the capacitors are fully discharged before troubleshooting.

NOTE: If using the inverter test tool maintenance, remove the big handle, take out the detection cable, take out female

end of the cable and connect the inverter test tool. After the maintenance is completed, insert the female end back into

the port.

Note: This picture is for reference only. Actual appearance may vary.

 Troubleshooting 4 

2. General Troubleshooting

2.1 Error Display (Indoor Unit)

When the indoor unit encounters a recognized error, the operation lamp will ﬂash in a corresponding series, the timer

lamp may turn on or begin ﬂashing, and an error code will be displayed. These error codes are described in the following

table:

Display Error Information Solution

Forced cooling(Not an error code) --

EC07

ODU fan speed out of control TS23

EC51

ODU EEPROM parameter error TS19

EC52

ODU coil temp. sensor(T3) error TS26

EC53

ODU ambient temp. sensor(T4) error TS26

EC54

COMP. discharge temp. sensor(TP) error TS26

EC56

IDU coil outlet temp. sensor(T2B) error(Multi-zone) TS26

ECC1

Other IDU refrigerant sensor detects leakage (Multi-zone) TS40

EH00

IDU EEPROM malfunction TS19

EH03

IDU fan speed out of control TS23

EH0A

IDU EEPROM parameter error TS19

EH0E

Water-level alarm malfunction TS28

EH12

Main unit or secondary units malfunction TS41

EH3A

External fan DC bus voltage is too low protection TS38

EH3

External fan DC bus voltage is too high fault TS38

EH60

IDU room temp. sensor (T1) error TS26

EH61

IDU evaporator coil temp. sensor (T2) error TS26

EH A

Communication error between the indoor unit and the external fan module TS38

EHC1

Refrigerant sensor detects leakage TS40

EHC2

Refrigerant sensor is out of range and leakage is detected TS40

EHC3

Refrigerant sensor is out of range TS39

 Troubleshooting 5 

EL01

IDU & ODU communication error TS20

EL0C

System lacks refrigerant TS27

EL11

Communication malfunction between main unit and secondary units TS41

FHCC

Refrigerant sensor error TS39

PC00

ODU IPM module protection TS29

PC01

ODU voltage protection TS30

PC02

Compressor top (or IPM) temp. proteciton TS35

PC03

Pressure protection (low or high pressure) (for some models) TS32

PC04

Inverter compressor drive error TS31

PC0L

Low ambient temperature protection(for some models) TS36

----

IDUs mode conﬂict(Multi-zone) --

For other errors:

The display board may show a garbled code or a code undeﬁned by the service manual. Ensure that this code is not a

temperature reading.

Troubleshooting:

Test the unit using the remote control. If the unit does not respond to the remote, the indoor PCB requires replacement.

If the unit responds, the display board requires replacement.

LED ﬂash frequency:

... ...

2.2 Error Display on Two Way Communication Wired Controller

Display Malfunction or Protection Solution

EH 3

Communication malfunction between wire and master control((for KJR-120X/KJR-120M/

KJR-120N series wired controller)

TS37

The other error codes displayed on the wire controller are same from those on the unit.

 Troubleshooting 6 

3. Engineering Mode

3.1 Information Inquiry

In order to enter to the engineering mode, and check the data of the system (data checking mode), Please make the

following steps:

• Make sure that the AC is on the standby status, or working normally in a non-locked conditions.

• Press “Power” + “Fan” buttons together for 7s until the remote controller screen shows “0”, and also “Auto, Cool,

Dry, Heat, Battery “ icons will be displayed at the same time.

• Press “Up” or “Down” button to choose different channel number that you want to check (from 0-30) on the

remote controller, and then the display will show the parameter value

Channel Code Meaning Remark

0 Error code

Refer to next list of error code Empty means no error

1 T1

Room temperature

Actual data, °C

2 T2

Indoor coil temperature

Actual data,°C

3 T3

Outdoor coil temperature

Actual data, °C

4 T4

Ambient temperature

Actual data, °C

5 TP

Discharge temperature

Actual data,°C

6 FT Targeted frequency

Actual data

7 Fr Actual frequency

Actual data

8 dL Running current

3.2A=3

9 Ac AC voltage

10 Sn Reserved

11 od Indoor operating mode

0-Off;1-Cooling;2-Heating;3-Fan only; 4-Drying;5-

Auto;7-defrosting;12-Active clean

12 Pr Outdoor fan speed

Actual data/8

13 Lr EXV opening steps

Actual data/8

14 Ir Indoor fan speed

Actual data/8

15 Hu Humidity (if a sensor there)

Actual data, %

16 TT Set temperature including compensation

Actual data, °C

17 nA Reserved

18 nA Reserved

19 Uo Outdoor DC bus voltage

20 oT Target Frequency calculated by indoor

Without limitation

21~29 nA Reserved

30 AP Actual static pressure

Please note that:

1-The Channel number indicates a certain parameter value (Check the below table).

2-The indoor unit display will show the code for 2s, and then the parameter value.

3-In the engineering mode, the other keys or operations are invalid except for the following buttons “Power”, “Up”,

“Down” , and “Ok”.

4-In order to exit from the engineering mode, press “Power” + “Fan” buttons together for 2s to quit Checking and back

to the home screen.

 Troubleshooting 7 

5-The engineering mode will be exited if there is no valid input data for 60s.

Error code of engineer mode

Display Error Information

EH00

IDU EEPROM malfunction

EH0A

IDU EEPROM parameter error

EL01

IDU & ODU communication error

EH A

Communication error between indoor unit and external fan module

EH30

Parameters error of indoor external fan

EH35

Phase failure of indoor external fan

EH36

Indoor external fan current sampling bias fault

EH37

Indoor external fan zero speed failure

EH38

Indoor external fan stall failure

EH39

Out of step failure of indoor external fan

EH3A

Low voltage protection of indoor external fan DC bus

EH3

Indoor external fan DC bus voltage is too high fault

EH3E

Indoor external fan overcurrent fault

EH3F

Indoor external fan module protection/hardware overcurrent protection

EH03

IDU fan speed out of control

EC51

ODU EEPROM parameter error

EC52

ODU coil temp. sensor(T3) error

EC53

ODU ambient temp. sensor(T4) error

EC54

COMP. discharge temp. sensor(TP) error

EC55

IGBT temperature sensor TH is in open circuit or short circuit

EC0

Outdoor unit malfunction

EH60

IDU room temp. sensor (T1) error

EH61

IDU evaporator coil temp. sensor (T2) error

EC71

Outdoor external fan overcurrent fault

EC75

Outdoor external fan module protection/hardware overcurrent protection

EC72

Outdoor external fan phase failure

EC74

Outdoor external fan current sampling bias fault

EC73

Zero speed failure of outdoor unit DC fan

EC07

ODU fan speed out of control(

EH 5

Intelligent eye communication failure

EL0C

Refrigerant leak detected

EH0E

Water-level alarm malfunction

EHOF

Intelligent eye malfunction

FH07

Communication malfunction between indoor unit and auto-lifting panel

PC00

ODU IPM module protection

PC10

Over low voltage protection

PC11

Over voltage protection

PC12

DC voltage protection

 Troubleshooting 8 

PC02

Top temperature protection of compressor or High temperature protection of IPM module

PC40

Communication error between outdoor main chip and compressor driven chip

PC41

Current Input detection protection

PC42

Compressor start error

PC43

Lack of phase (3 phase) protection

PC44

Outdoor unit zero speed protection

PC45

341PWM error

PC46

Compressor speed malfunction

PC49

Compressor over current protection

PC06

Compressor discharge temperature protection

PC08

Outdoor current protection

PH09

Anti-cold air in heating mode

PC0f

PFC module malfunction

PC30

System overpressure protection

PC31

System pressure is too low protection

PC03

Pressure protection

PC0l

Outdoor low ambient temperature protection

PH 90

Evaporator coil temperature over high protection

PH 91

Evaporator coil temperature over low Protection

PC0A

Condenser high temperature protection

PH0c

Indoor unit humidity sensor failure

LH00

Frequency limit caused by T2

LH30

Indoor external fan current limit

LH31

Indoor external fan voltage limit

LC01

Frequency limit caused by T3

LC02

Frequency limit caused by TP

LC05

Frequency limit caused by voltage

LC03

Frequency limit caused by current

LC06

Frequency limit caused by PFC

LC30

Frequency limit caused by high pressure

LC31

Frequency limit caused by low pressure

LH07

Frequency limit caused by remote controller

----

IDUs mode conﬂict(match with multi outdoor unit)

No malfunction and protection

 Troubleshooting 9 

3.2 Advanced Function Setting

In order to enter to the engineering mode, and check the advanced function settings, Please make the following steps:

If you want to check the current functions set value (Presetting Page):

1- Firstly, you need to disconnect the power supply from the unit, and wait for 1 minute.

2- Then connect the power supply again to the unit (the unit should be under the standby state).

3- Press “Power” + “Fan” buttons together for 7s until the remote controller screen shows “0”, and also “Auto, Cool,

Dry, Heat, Battery “ icons will be displayed at the same time.

4- Press “Up” or “Down” button to choose different channel number that you want to check (from 0-30) on the remote

controller.

5- Then Press “Power” button for 2s until the remote controller screen shows “Ch” .

6- Press “OK” button to query the current function set value while the remote controller shows “CH”, and the function

set value will be shown on the indoor unit display.

If you want to change the current functions set value:

1- Firstly, you need to disconnect the power supply from the unit, and wait for 1 minute.

2- Then connect the power supply again to the unit (the unit should be under the standby state).

3- Press “Power” + “Fan” buttons together for 7s until the remote controller screen shows “0”, and also “Auto, Cool,

Dry, Heat, Battery “ icons will be displayed at the same time.

4- Press “Up” or “Down” button to choose different channel number that you want to change (from 0-30) on the

remote controller.

5- Then Press “Power” button for 2s until the remote controller screen shows “Ch”.

6- Press “Up” or “Down” button to choose the desired set value from the screen of the remote control.

7- Then Press “OK” to send the new set value to the indoor unit, and the indoor unit will display “CS”, which means

that the new set value is uploaded successfully.

8- Finally, disconnect the power supply again from the unit, and wait for 10 minutes, then connect it again.

Please note that:

1- The Channel number indicates a certain function, and each number will be showed on the indoor unit screen

indicates the current function set value (Check the below table).

2- In the engineering mode, the other keys or operations are invalid except for the following buttons “Power”, “Up”,

“Down” , and “Ok”.

3- In order to set a new set value successfully, you need to ﬁnish the steps (from 2 to 7) within 1 minute only.

4- The engineering mode will be exited if there is no valid input data for 60s.

5- In order to exit from the engineering mode, Pleas follow the following steps:

- Press “Power” button for 2s press until the remote controller screen shows “0”.

- Then Press “Power” + “Fan” buttons together for 2s to quit the engineering mode and back to the home screen.

 Troubleshooting 10 

Channel Function Parameter Value Meaning Remark

Capacity setting

(Btu/h)

1-100K

1 Auto-restart function

0 – Inactive

1 – Active

Fan control when Ts

reached

1- Fan stop

2 - Fan runs at lowest RPM

3 - Fan runs at setting RPM

4~11 - Fan stops for 4 mins and runs for 1min

3 Mode lock

CH–Cooling and heating (all modes)

HH–Heating only (Heating + Fan only)

CC–Cooling only (Cooling + Drying + Fan only)

nU–Cooling and heating without Auto

Remote controller will

change as well.

Lowest setting

temperature

16-24

Remote controller will

change as well.

Highest setting

temperature

25-30

Remote controller will

change as well.

6 Reserved

7 Twins selection 0 – No twins; 1 – Master unit; 2– Secondar unit

Static pressure/

Constant air volume

0-8-Static pressure; AF-Constant air volume

9 / Nothing to set

10 / Nothing to set

Min. frequency

limitation in cooling

mode

10, 11, 12, …, 49, 50, -- (Cancel)

Min. frequency

limitation in heating

mode

10, 11, 12, …, 49, 50, -- (Cancel)

Max frequency

selection in T4

limitation of Zone6

20, 21, 22, …, 149, 150, -- (Cancel)

14 / Nothing to set

Frequency selection

of outdoor forced-

operation

10, 11, 12, …, 249, 250, -- (Cancel)

16 One button reset rS – Reset

17 nA Nothing to set

18 Capacity setting(kW) 23,26,32,35,51,72,120,-- (Cancel)

Max. frequency

selection in cooling

mode

40, 41, 42, …, 83, 84, -- (Cancel)

Max. frequency

selection in heating

mode

40, 41, 42, …, 83, 84, -- (Cancel)

Without limitation

Cooling temperature

compensation

-3.0, -2.5, -2.0, …, 3.0, 3.5, -- (Cancel)

 Troubleshooting 11 

Heating temperature

compensation

-6.5, -6.0, -5.5, …, 0.5, 1.0, 1.5, …, 7.0, 7.5, -- (Cancel)

Max. fan speed

selection in cooling

-41, -40, -39, …, 19, 20, -- (Cancel)

Min. fan speed

selection in cooling

-41, -40, -39, …, 19, 20, -- (Cancel)

Max. fan selection in

heating

-41, -40, -39, …, 19, 20, -- (Cancel)

Min. fan speed

selection in heating

-41, -40, -39, …, 19, 20, -- (Cancel)

27 Reserved Nothing to set

Anti-cold air Stop

Fan Temperature

16~28

29 Reserved Nothing to set

30 Reserved Nothing to set

 Troubleshooting 12 

4. Error Diagnosis and Troubleshooting Without Error Code

WARNING

Be sure to turn off unit before any maintenance to prevent damage or injury.

4.1 Remote maintenance

SUGGESTION: When troubles occur, please check the following points with customers before ﬁeld maintenance.

No. Problem Solution

1 Unit will not start TS14 - TS15

2 The power switch is on but fans will not start TS14 - TS15

3 The temperature on the display board cannot be set TS14 - TS15

4 Unit is on but the wind is not cold(hot) TS14 - TS15

5 Unit runs, but shortly stops TS14 - TS15

6 The unit starts up and stops frequently TS14 - TS15

7 Unit runs continuously but insufﬁcient cooling(heating) TS14 - TS15

8 Cool can not change to heat TS14 - TS15

9 Unit is noisy TS14 - TS15

 Troubleshooting 13 

4.2 Field maintenance

Problem Solution

1 Unit will not start TS16 - TS17

2 Compressor will not start but fans run TS16 - TS17

3 Compressor and condenser (outdoor) fan will not start TS16 - TS17

4 Evaporator (indoor) fan will not start TS16 - TS17

5 Condenser (Outdoor) fan will not start TS16 - TS17

6 Unit runs, but shortly stops TS16 - TS17

7 Compressor short-cycles due to overload TS16 - TS17

8 High discharge pressure TS16 - TS17

9 Low discharge pressure TS16 - TS17

10 High suction pressure TS16 - TS17

11 Low suction pressure TS16 - TS17

12 Unit runs continuously but insufﬁcient cooling TS16 - TS17

13 Too cool TS16 - TS17

14 Compressor is noisy TS16 - TS17

15 Horizontal louver can not revolve TS16 - TS17

 Troubleshooting 14 

1.Remote Maintenance

Possible causes of trouble

Power failure

The main power tripped

Loose connections

Faulty transformer

The voltage is too high or too low

The remote control is powered off

Broken remote control

Dirty air filter

Dirty condenser fins

The setting temperature is higher/lower than the room's(cooling/heating)

The ambient temperature is too high/low when the mode is cooling/heating

Fan mode

SILENCE function is activated(optional function)

Frosting and defrosting frequently

Unit will not start ☆ ☆

☆

The power switch is on but fans will not start ☆

☆ ☆

The temperature on the display board cannot be set ☆ ☆

Unit is on but the wind is not cold(hot) ☆ ☆

☆

Unit runs, but shortly stops

☆ ☆

☆

The unit starts up and stops frequently ☆ ☆

☆

Unit runs continuously but insufficient cooling(heating) ☆ ☆ ☆ ☆ ☆

Cool can not change to heat

Unit is noisy

Test method / remedy

Test voltage

Close the power switch

Inspect connections - tighten

Change the transformer

Test voltage

Replace the battery of the remote control

Replace the remote control

Clean or replace

Clean

Adjust the setting temperature

Turn the AC later

Adjust to cool mode

Turn off SILENCE function.

Turn the AC later

Refrigerant Circuit

Electrical Circuit

 Troubleshooting 15 

1.Remote Maintenance

Possible causes of trouble

Heavy load condition

Loosen hold down bolts and / or screws

Bad airproof

The air inlet or outlet of either unit is blocked

Interference from cell phone towers and remote boosters

Shipping plates remain attached

Unit will not start

The power switch is on but fans will not start

☆

The temperature on the display board cannot be set

Unit is on but the wind is not cold(hot)

Unit runs, but shortly stops

The unit starts up and stops frequently ☆

Unit runs continuously but insufficient cooling(heating)

☆ ☆ ☆

Cool can not change to heat

Unit is noisy ☆

☆

Test method / remedy

Check heat load

Tighten bolts or screws

Close all the windows and doors

Remove the obstacles

Reconnect the power or press

ON/OFF button on remote control to restart operation

Remove them

Others

 Troubleshooting 16 

2.Field Maintenance

Possible causes of trouble

Compressor stuck

Shortage of refrigerant

Restricted liquid line

Dirty air filter

Dirty evaporator coil

Insufficient air through evaporator coil

Overcharge of refrigerant

Dirty or partially blocked condenser

Air or incompressible gas in refrigerant cycle

Short cycling of condensing air

High temperature condensing medium

Insufficient condensing medium

Broken compressor internal parts

Inefficient compressor

Expansion valve obstructed

Expansion valve or capillary tube closed completely

Leaking power element on expansion valve

Poor installation of feeler bulb

Heavy load condition

Loosen hold down bolts and / or screws

Shipping plates remain attached

Poor choices of capacity

Contact of piping with other piping or external plate

Unit will not start

Compressor will not start but fans run

☆

Compressor and condenser (outdoor) fan will not

start

Evaporator (indoor) fan will not start

Condenser (Outdoor) fan will not start

Unit runs, but shortly stops ☆ ☆

☆ ☆ ☆ ☆

Compressor short-cycles due to overload

☆ ☆ ☆

High discharge pressure ☆ ☆ ☆ ☆ ☆ ☆

Low discharge pressure

☆ ☆

High suction pressure ☆

☆ ☆ ☆

Low suction pressure

☆ ☆ ☆

☆ ☆ ☆ ☆

☆

Unit runs continuously but insufficient cooling

☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆

☆ ☆

Too cool

Compressor is noisy ☆

☆ ☆ ☆ ☆

Horizontal louver can not revolve

Test method / remedy

Replace the compressor

Leak test

Replace restricted part

Clean or replace

Clean coil

Check fan

Change charged refrigerant volume

Clean condenser or remove obstacle

Purge, evacuate and recharge

Remove obstruction to air flow

Remove obstruction in air or water flow

Replace compressor

Test compressor efficiency

Replace valve

Fix feeler bulb

Check heat load

Tighten bolts or screws

Remove them

Choose AC of lager capacity or add the number of AC

Rectify piping so as not to contact each other or with external

plate

Refrigerant Circuit

Others

 Troubleshooting 17 

2.Field Maintenance

Possible causes of trouble

Power failure

Blown fuse or varistor

Loose connections

Shorted or broken wires

Safety device opens

Faulty thermostat / room temperature sensor

Wrong setting place of temperature sensor

Faulty transformer

Shorted or open capacitor

Faulty magnetic contactor for compressor

Faulty magnetic contactor for fan

Low voltage

Faulty stepping motor

Shorted or grounded compressor

Shorted or grounded fan motor

Unit will not start ☆ ☆ ☆ ☆ ☆ ☆

Compressor will not start but fans run

☆ ☆ ☆ ☆

☆

Compressor and condenser (outdoor) fan will not start ☆ ☆ ☆

Evaporator (indoor) fan will not start

☆ ☆ ☆

☆

Condenser (Outdoor) fan will not start ☆ ☆ ☆

☆ ☆

Unit runs, but shortly stops ☆

☆

Compressor short-cycles due to overload

☆

High discharge pressure

Low discharge pressure

High suction pressure

Low suction pressure

Unit runs continuously but insufficient cooling

Too cool ☆ ☆

Compressor is noisy

Horizontal louver can not revolve ☆ ☆ ☆

Test method / remedy

Test voltage

Inspect fuse type & size

Inspect connections - tighten

Test circuits with tester

Test continuity of safety device

Test continuity of thermostat / sensor & wiring

Place the temperature sensor at the central of the air inlet

grille

Check control circuit with tester

Check capacitor with tester

Test continuity of coil & contacts

Test voltage

Replace the stepping motor

Check resistance with multimeter

Electrical Circuit

 Troubleshooting 18 

5. Quick Maintenance by Error Code

If you do not have the time to test which speciﬁc parts are faulty, you can directly change the required parts according

the error code.

You can ﬁnd the parts to replace by error code in the following table.

Part requiring

replacement

Error Code

EH00/

EH0A

EL01 EH03 EH60 EH61 EL0C

EHC1/

EHC2

EH0E EC53 EH0b

Indoor PCB

x x

Outdoor PCB x x x x x x x x

Indoor fan motor x x x x x x x x x

T1 sensor x x x x x x x x x

T2 sensor x x x x x x x

T3 sensor x x x x x x x x x x

T4 sensor x x x x x x x x x

Reactor x x x x x x x x x

Compressor x x x x x x x x x x

Additional

refrigerant

x x x x x x x

Water-level switch x x x x x x x x x

Water pump x x x x x x x x x

Display board x x x x x x x x x

Part requiring

replacement

EC54 EC51 EC52 EC56 EC07 PC00 PC01 PC02 PC04 PC03

FHCC/

EHC3

Indoor PCB

x x x x x x x x x x

Outdoor PCB x

Outdoor fan motor x x x x x x x

T3 sensor x x x x x x x x x x

TP sensor x x x x x x x x x x

T2B sensor x x x x x x x x x x

Refrigerant sensor x x x x x x x x x x

Reactor sensor x x x x x x x x x x

Compressor x x x x x x x x x

IPM module board x x x x x x x

Pressure protector x x x x x x x x x x

Additional

refrigerant

x x x x x x x x x x

 Troubleshooting 19 

6. Troubleshooting by Error Code

6.1 EH00/ EH0A / EC51 (EEPROM Malfunction Error Diagnosis and Solution)

Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip.

Recommended parts to prepare:

• Indoor PCB

• Outdoor PCB

Troubleshooting and repair:

Shut off the power supply and

turn it on 2 minutes later.

Is it still displaying

the error code?

YES

Replace the indoor main PCB(EH

00/EH 0A) /outdoor main PCB(EC

51).

The unit is operating normally.

Remarks:

EEPROM: A read-only memory whose contents can be erased and reprogrammed using a pulsed voltage.

The location of the EEPROM chip on the indoor and outdoor PCB is shown in the following two images:

This pictures are only for reference, actual appearance may vary.

Troubleshooting and repair of compressor driven chip EEPROM parameter error and communication error

between outdoor main chip and compressor driven chip are same as EC51.

 Troubleshooting 20 

6.2 EL01 (IDU & ODU communication error Diagnosis and Solution)

Description: Indoor unit can not communicate with outdoor unit

Recommended parts to prepare:

• Indoor PCB

• Outdoor PCB

• Reactor

Troubleshooting and repair:

Current loop Communication(S Communication):

Does the error code

disappear?

Power off, then restart the unit after 2

minutes.

Measure the DC voltage between N/L2

and S (Black pin to N/L2, Red pin to S).

The value is fixed and close

to 0

The value is alternative

from negative to positive

The value is always positive

Check the wiring connection

between indoor and outdoor

unit, are they good?

Check the wiring connection

from outdoor terminal to

outdoor PCB and wiring

between PCBs if there is

more than 1 PCB

Check the wiring connection

from indoor terminal to indoor

PCB, are they good?

Turn on the unit, check if W

and 1(L) is connected?

Check if the power LED is

on?

Yes

Unplug all the high voltage

components connected to main

PCB such as 4 way valve, heater,

AC fan one by one to check their

resistance. Is there any component

short circuit?

Unplug electronic expansion valve.

Check if power LED is on?

Check the AC voltage of L, N

output to IPM board, is it same

as power input?

Check the DC 5V, 12V

from IPM board to main

PCB, are they normal?

Unplug all the high voltage

components connected to main

PCB such as 4 way valve, heater,

AC fan one by one to check their

resistance. Is there any component

short circuit?

Yes

Unplug electronic expansion valve.

Check if the DC 5V, 12V to main

PCB are OK

Replace short-circuited

component and main

PCB

Replace coil of electronic

expansion valve

Replace outdoor PCB

Replace short-circuited

component and outdoor

PCB

Yes

Replace main PCBNo

Yes

Replace IPM board

Repalce indoor PCB

Solved

Correct the connection or

change wires

Yes

For units with main PCB and IPM board

both

For units with only one

PCB

For units

with W wire

For units without W

wire

 Troubleshooting 21 

Remarks:

• Use a multimeter to test the DC voltage between 2 port(or S or L2 port) and 3 port(or N or S port) of outdoor unit.

The red pin of multimeter connects with 2 port(or S or L2 port) while the black pin is for 3 port(or N or S port) .

• When AC is operating normally, the voltage is moving alternately as positive values and negative values

• If the outdoor unit has malfunction, the voltage has always been the positive value.

• While if the indoor unit has malfunction, the voltage has always been a certain value.

• Use a multimeter to test the resistance of the reactor which does not connect with capacitor.

• The normal value should be around zero ohm. Otherwise, the reactor must have malfunction.

Note: The picture and the value are only for reference, actual condition and speciﬁc value may vary.

S and N

L2 and S

2 and 3

 Troubleshooting 22 

485 Communication(S1,S2 Communication):

Recommended parts to prepare:

• Signal wires

• Magnet ring

• Indoor PCB

• Outdoor PCB

Troubleshooting and repair:

Power off, then restart the unit 2

minutes later

Adopt shield cable/Shield cable

earthing.

Yes

Remove interference or

add magnet ring on power

wire

Yes

Replace the signal wire.

Yes

Pull out and insert back.

Replace indoor main PCB, is the error

distinguished?

Yes

Replace the outdoor main PCB.

Check whether there’s any

interference.

Such as too many lamps, power

transformers? Or the signal wire

is too long?

Check whether the signal wire is

shield cable or whether the

shield cable is earthing?

Check whether the signal wire is

broken?

Check whether the signal wires

insert on PCB well?

 Troubleshooting 23 

6.3 EH03 / EC07 (Fan Speed Out of Control Diagnosis and Solution)

Description: When indoor / outdoor fan speed keeps too low or too high for a certain time, the unit ceases operation

and the LED displays the failure.

Recommended parts to prepare:

• Connection wires

• Fan assembly

• Fan motor

• PCB

Troubleshooting and repair:

YES

Power off, then restart the unit after 2 minutes.

Is it within normal parameters?

Replace the fan motor

Does a problem remain?

The unit is operating normally

Shut off the power supply, Rotate

the fan by hand.

YES

Does it turn easily?

Find the cause of the problem and resolve it

Check the wiring of fan motor.

YES

Is it improperly wired?

Ensure proper connections

Measure the voltage for

the fan motor from the PCB.

YES

Replace the main PCB

Replace the DC fan IPM board (if

has)

 Troubleshooting 24 

Index:

1.Indoor DC Fan IPM Board

For A6 Duct Unit:

Port Description Parameter Remark

CON1 Power input for the PCB 230V/AC

CN1 Communication with main PCB DC

CN2 Test port 5V/DC For debugging board

CN23 UVW output for DC fan motor

CON2 Ports for reactor

CN1 Communication with main PCB

12345

NO. Signal Voltage

1 Vcc +15V

2 GND

3 TXD 0~6V

4 RXD 0~15V

5 -- --

For A7 Duct unit:

Power on and when the unit is in standby, measure the voltage of CN15, pin1-pin2 and pin3-pin2 of CN13 in DC motor

driver board. If the value of the voltage is not in the range showing in below tables, the indoor main PCB must has

problems and need to be replaced.

 Troubleshooting 25 

Port Description Parameter Remark

CN15 Power input for the PCB 230V/AC L, N and Earth

CN13 Communication with main PCB DC

CN6 Test port 5V/DC For debugging board

CN20 UVW output for DC fan motor

CN18L Ports for reactor

CN13 Communication with main PCB

12345

NO. Signal Voltage

1 Vcc +15V

2 GND

3 TXD 0~6V

4 RXD 0~15V

5 -- --

2. Outdoor DC Fan Motor (control chip is in outdoor PCB)

Release the UVW connector. Measure the resistance of U-V, U-W, V-W. If the resistance is not equal to each other, the

fan motor must has problems and need to be replaced. otherwise the PCB must has problems and need to be replaced.

 Troubleshooting 26 

6.4 EH60/EH61/EC53/EC52/EC54/EC56 (Open Circuit or Short Circuit of Temperature Sensor

Diagnosis and Solution)

Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure.

Recommended parts to prepare:

• Connection wires

• Sensors

• PCB

Troubleshooting and repair:

Check the connection between

temperature sensor and PCB.

Replace indoor PCB((EH XX) or outdoor

PCB(EC XX)

Is it within acceptable

parameters?

Is it properly wired? Ensure proper connections.

Measure the resistance value

of the sensor.

YES

Replace the sensor.

YES

This picture and the value are only for reference, actual appearance and value may vary

 Troubleshooting 27 

6.5 EL0C (System lacks refrigerant Diagnosis and Solution)

Description: Judging the abnormality of the refrigeration system according to the number of compressor stops and the

changes in operating parameters caused by excessive exhaust temperature.

Recommended parts to prepare:

• Indoor PCB

• Additional refrigerant

Troubleshooting and repair:

Power off, then restart the unit 15 minutes later.

Are any leakages present?

Put your hands in front of the

indoor air outlet.

Is there cool or heat

air blowing out from

indoor air outlet?

Ensure proper connections.

Check system for leakages.

Repair the leakage and

recharge the refrigerant.

YES

Is T2 loose?

YES YES

Is T1 too close to

the evaporator

Install correctly

YES

Replace the indoor PCB

Charge the refrigerant

appropriately(about 10% of

the nameplate charg e)

 Troubleshooting 28 

6.6 EH0E(Water-Level Alarm Malfunction Diagnosis and Solution)

Description: If the sampling voltage is not 5V, the LED displays the failure code.

Recommended parts to prepare:

• Connection wires

• Water-level switch

• Water pump

• Indoor PCB

Shut off the power supply and

turn it on 2 minutes later

Shut off the power supply and

turn it on 2 minutes later.

Does a problem

remain

Does a problem

remain?

YES

s the water-level switch

inserted properly?

Is the water-level switch

inserted properly?

Replace the indoor main PCB.

YES

The unit is operating normally.

Insert the water-

level

switch properly

Insert the water-

level

switch properly

Is the water-level switch

broken?

Is the water-level switch

broken?

Replace the water-level switch

Replace the water

-level switch

YES

Replace the water pump

Does a problem

remain?

Does a problem

remain?

YES

The unit is operating normally.NO

 Troubleshooting 29 

6.7 PC00(ODU IPM module protection Diagnosis and Solution)

Description: When the voltage signal the IPM sends to the compressor drive chip is abnormal, the display LED shows

“PC00” and the AC turn off.

Recommended parts to prepare:

• Connection wires

• IPM module board

• Outdoor fan assembly

• Compressor

• Outdoor PCB

Troubleshooting and repair:

Check the wiring between

PCB and compressor.

Does an error exist?

Ensure proper connections

replace the wires and connectors.

YES

Check the IPM.

Is it in working order?

Replace the IPM board or

replace the outdoor PCB.

Check the outdoor fan and the

outdoor unit ventilation.

YES

Is it in working order?

Please refer to the solution of

the “

Fan

Speed is Out of Control”malfunction.

Check the compressor

resistance values.

YES

Are they within

acceptable parameters?

Replace the compressor.

Replace the outdoor PCB.

YES

 Troubleshooting 30 

6.8 PC01(ODU voltage protection Diagnosis and Solution)

Description: Abnormal increases or decreases in voltage are detected by checking the speciﬁed voltage detection circuit.

Recommended parts to prepare:

• Power supply wires

• IPM module board

• PCB

• Reactor

Troubleshooting and repair:

Check the power supply.

Is it in working order?

Turn off the unit.

Check the connections and wires.

YES

Are they in working order?

Ensure proper connections or

replace the wires.

Power on and measure the

voltage between P and N.

YES

While the unit is in standby,

is the voltage between P and N is around

DC 310V, 340V or 380V? When start up

the unit, is it in 220V~400V?

Replace the IPM board.NO

Check the reactor.

YES

Is it in working order?

Replace outdoor PCB.

Replace the reactor.

YES

Skip this step for models which

electric control box cover cannot

be removed. See the disassembly

guide for details.

 Troubleshooting 31 

6.9 PC04(Inverter compressor drive error Diagnosis and Solution)

Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communication

signal detection, voltage detection, compressor rotation speed signal detection and so on.

Recommended parts to prepare:

• Connection wires

• IPM module board

• Outdoor fan assembly

• Compressor

• Outdoor PCB

Troubleshooting and repair:

Check the wiring between the

PCB and compressor.

Is it improperly wired?

Ensure proper connections or replace

the wires and connectors.

YES

Check the IPM.

Is it functioning

properly?

Replace the IPM board or

replace the outdoor PCB.

Check the outdoor fan and

the outdoor unit ventilation.

YES

Is it functioning

properly?

Please refer to “Fan

Speed Malfunction”

Check the compressor

resistance values.

YES

Are they within

acceptable parameters?

Replace the compressor.NO

Replace the outdoor PCB.

YES

 Troubleshooting 32 

6.10 PC03(Pressure protection (low or high pressure) Diagnosis and Solution)

Description: Outdoor pressure switch cut off the system because high pressure is higher than 4.4 MPa or outdoor

pressure switch cut off the system because low pressure is lower than 0.13 MPa, the LED displays the failure code.

Recommended parts to prepare:

• Connection wires

• Pressure switch

• Outdoor fan

• Outdoor main PCB

• Refrigerant

Troubleshooting and repair:

 Troubleshooting 33 

Are the high pressure switch

and main control boar wired

correctly?

Are the high pressure switch

and main control boar wired

correctly?

Method: Disconnect the plug.

Measure the resistance of the

high pressure protector, if the

protector is normal the value is

o, Does a problem still exist?

Method: Disconnect the plug.

Measure the resistance of the

high pressure protector, if the

protector is normal the value is

o, Does a problem still exist?

Yes

Is the high pressure

protector broken?

Is the high pressure

protector broken?

Is the outdoor ambient

temperature is higher than

50℃?

Is the outdoor ambient

temperature is higher than

50℃?

Yes

Check if the outdoor unit

ventilation is good

Check if the outdoor unit

ventilation is good

Yes

Is the heat exchanger dirty?

Yes

Replace outdoor main board. Is

the problem resolved?

Replace outdoor main board. Is

the problem resolved?

High pressure protection

Is the outdoor fan running

properly?

Is the outdoor fan running

properly?

Yes

Connect high pressure switch and

mian control board

Connect high pressure switch and

mian control board

Replace high pressure protector

Stop the unit

Ensure that the outdoor unit

ventilation is functioning properly

Ensure that the outdoor unit

ventilation is functioning properly

Please refer to the solution of the “Fan

Speed is operating outside of normal

range”malfunction.

Please refer to the solution of the “Fan

Speed is operating outside of normal

range”malfunction.

Clean the heat exchanger

Check whether the refrigerant

system is functioning properly

Check whether the refrigerant

system is functioning properly

 Troubleshooting 34 

Low pressure protection

Are the low pressure protector

and main control board wired

properly?

Are the low pressure protector

and main control board wired

properly?

Yes

Reconnect the low pressure protector

and main control board

Reconnect the low pressure protector

and main control board

Replace outdoor main board

Replace low pressure protector

Is the outdoor ambient

temperature

too low?

Is the outdoor ambient

temperature too low?

Stop the unit

Yes

Open the valve core of the high

pressure valve

Open the valve core of the high

pressure valve

Is the

valve core of the high

pressure valve fully opened?

Is the valve core of the high

pressure valve fully opened?

Is the indoor fan running

properly in cooling mode?

Is the indoor fan running

properly in cooling mode

Refer to the solution to the malfunction

of fan speed being out of control. Find

the cause and resolve the problem.

Refer to the solution to the malfunction

of fan speed being out of control. Find

the cause and resolve the problem.

Yes

Check whether the refrigerant

system is functioning properly.

Check whether the refrigerant

system is functioning properly.

Is it in working order?

When the level of refrigerant is

not sufficient, doe the system

function properly after more

refrigerant is added?

When the level of refrigerant is

not sufficient, doe the system

function properly after more

refrigerant is added?

Is the low pressure protector

broken?Method: Disconnect the

plug. Measure the resistance of

the low pressure protector

. If the

protector is normal the value is o.

Is the low pressure protector

broken?Method: Disconnect the

plug. Measure the resistance of

the low pressure protector. If the

protector is normal the value is o.

Yes

 Troubleshooting 35 

6.11 PC02(Compressor top (or IPM) temp. proteciton Diagnosis and Solution)

Description: For some models with overload protection, If the sampling voltage is not 5V, the LED will display the failure.

If the temperature of IPM module is higher than a certain value, the LED displays the failure code.

Recommended parts to prepare:

• Connection wires

• Outdoor PCB

• IPM module board

• High pressure protector

• System blockages

Troubleshooting and repair:

Check if the air flow system

of indoor and outdoor units

are obstructed?

Clear up the air inlet and outlet or the heat

exchanger of indoor and outdoor units.

Yes

Turn off the power supply and turn

it on 10 minutes later.

Check if the temperature of

compressor Top

Is more than 90℃？

Check if the refrigerant

system

is normal?

Repair the refrigerant

system .

Replace the outdoor control PCB.

Yes

Check if all the connection, especially

the connection of OLP (Over Load

Protector) sensor is good.

Correct the connection.

Measure the resistance

between the two ports of

the OLP. Is it zero?

Yes

Replace the OLP.No

Replace the outdoor control PCB.Yes

 Troubleshooting 36 

Check the fastening screws on the

PCB and IPM radiator.

Are they

fixed tightly?

Replace the outdoor

control PCB.

Tighten the screws and apply

silicon grease.

YES

6.12 PC0L (Low ambient temperature protection)

Description: It is a protection function. When compressor is off, outdoor ambient temperature(T4) is lower than -35

for 10s, the AC will stop and display the failure code.

When compressor is on, outdoor ambient temperature(T4) is lower than -40

C.for 10s, the AC will stop and display the

failure code.

When outdoor ambient temperature(T4) is no lower than -32

C.for 10s, the unit will exit protection.

 Troubleshooting 37 

6.13 EH b3 (Communication malfunction between wire and master control) Diagnosis and

Solution

Description: If Indoor PCB does not receive feedback from wired controller, the error displays on the wired controller

Recommended parts to prepare:

• Connection wires

• Indoor PCB

• Wired controller

Troubleshooting and repair:

YES

Power off, then restart the unit after 2 minutes.

Does the error still exist?

Replace the wired controller

Does a problem remain?

The unit is operating normally

Check the wirings and connections

YES

Are all the

connections good?

Ensure proper connections

YES

Replace the indoor main PCB

The problem is solved

 Troubleshooting 38 

6.14 EH bA(Communication error between the indoor unit and the external fan module)/

EH3A(External fan DC bus voltage is too low protection)/ EH3b(External fan DC bus

voltage is too high fault) diagnosis and solution

Description: Indoor unit does not receive the feedback from external fan module during 150 seconds.

or Indoor unit receives abnormal increases or decreases in voltage from external fan module.

Recommended parts to prepare:

• External drive board

• Indoor main PCB

Troubleshooting and repair:

Shut off the power supply and

turn it on 2 minutes later.

Is it still displaying

the error code?

Replace the indoor main PCB.

The unit is operating normally.

Check if ENC1 is

correct

Reset the ENC1

Yes

Check whether the external driver board

is damaged by referring to Index. (if has)

Replace the external driver board

Yes

 Troubleshooting 39 

6.15 FHCC(Refrigerant sensor error) or EHC3(Refrigerant sensor is out of range) diagnosis

and solution

Description: Indoor unit receives fault signal for 10s or indoor unit does not receive feedback from refrigerant sensor for

150s.

Recommended parts to prepare:

• Connection wires

• Sensors

• Indoor main PCB

Troubleshooting and repair:

Check the connection between

refrigerant sensor and PCB.

If the fault still exists, replace

the indoor main PCB

Is it properly wired?

Ensure proper connections.

YES

Replace the sensor.

 Troubleshooting 40 

6.16 EHC1(Refrigerant sensor detects leakage) or EHC2(Refrigerant sensor is out of range

and leakage is detected) diagnosis and solution

Description:

The refrigerant sensor detects a concentration higher than or equal to 10%*LFL for 10 seconds or the refrigerant sensor

detects a concentration higher than or equal to 20%*LFL or the multi model receives the refrigerant leakage protection

fault sent by the outdoor unit.

Multi-zone: Only the buzzer of the indoor unit that detects refrigerant leakage continues to sound the alarm, the

shortest sound is 10 seconds, and the longest sound is 5 minutes (you can press any key such as remote control or wire

control, APP and so on to eliminate the alarm), and the other non-refrigerant leakage fault indoor unit only displays

“ECC1”, but the buzzer does not sound.

Recommended parts to prepare:

• Additional refrigerant

Troubleshooting and repair:

Power off, then restart the unit 2 minutes later.

Are any leakages

present?

Check System for blockages and

clear blockages if present.

Does a problem remain?

YES

Check system for leakages.

Repair the leakage and recharge

the refrigerant.

YES

 Troubleshooting 41 

6.17 EL11 (Communication malfunction between main unit and secondary units(for twins

system) Diagnosis and Solution)

Description: When set in twins system, master unit and slave unit cannot be recognized normally.

Recommended parts to prepare:

• Connection wires

• Indoor PCB

Check the dial switch

settings of master unit and

slave unit. Are they correct?

Check the dial switch

settings of master unit and

slave unit. Are they correct?

Correct the settings

Check the PQE

communication wires

connection, is it wired

properly?

Check the PQE

communication wires

connection, is it wired

properly?

Yes

Correct the wire connections

One of the 2 indoor PCBs is

defective.

Connect only one indoor unit to

the outdoor unit separately. The

one that displays an E1 error code

is defective

One of the 2 indoor PCBs is

defective.

Connect only one indoor unit to

the outdoor unit separately. The

one that displays an E1 error code

is defective

Yes

6.18 EH12 (Main unit or secondary units malfunction(for twins system) ) Diagnosis and

Solution)

Description: When set in twins system, one indoor unit displays this error code, which means another indoor unit is

faulty. Check another indoor unit’s error code and then follow the prescribed solutions to resolve the malfunction.

 Troubleshooting 

7. Check Procedures

7.1 Temperature Sensor Check

WARNING

Be sure to turn off all power supplies or disconnect all wires to avoid electric shock.

Operate after compressor and coil have returned to normal temperature in case of injury.

1. Disconnect temperature sensor from PCB (Refer to Indoor Disassembly and Outdoor Disassembly).

2. Measure the resistance value of the sensor using a multi-meter.

3. Check corresponding temperature sensor resistance value table (Refer to Chapter 8. Appendix).

Note: The picture and the value are only for reference, actual condition and speciﬁc value may vary.

Contents

i) Temperature Sensor Resistance Value Table for TP (°C --K) ................................2

ii) Other Temperature Sensors Resistance Value Table (°C – K) ..............................3

iii) System Pressure Table ...........................................................................................4

Appendix

 Appendix 2 

i) Temperature Sensor Resistance Value Table for TP (°C --K)

°C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm

-20 -4 542.7 20 68 68.66 60 140 13.59 100 212 3.702

-19 -2 511.9 21 70 65.62 61 142 13.11 101 214 3.595

-18 0 483 22 72 62.73 62 144 12.65 102 216 3.492

-17 1 455.9 23 73 59.98 63 145 12.21 103 217 3.392

-16 3 430.5 24 75 57.37 64 147 11.79 104 219 3.296

-15 5 406.7 25 77 54.89 65 149 11.38 105 221 3.203

-14 7 384.3 26 79 52.53 66 151 10.99 106 223 3.113

-13 9 363.3 27 81 50.28 67 153 10.61 107 225 3.025

-12 10 343.6 28 82 48.14 68 154 10.25 108 226 2.941

-11 12 325.1 29 84 46.11 69 156 9.902 109 228 2.86

-10 14 307.7 30 86 44.17 70 158 9.569 110 230 2.781

-9 16 291.3 31 88 42.33 71 160 9.248 111 232 2.704

-8 18 275.9 32 90 40.57 72 162 8.94 112 234 2.63

-7 19 261.4 33 91 38.89 73 163 8.643 113 235 2.559

-6 21 247.8 34 93 37.3 74 165 8.358 114 237 2.489

-5 23 234.9 35 95 35.78 75 167 8.084 115 239 2.422

-4 25 222.8 36 97 34.32 76 169 7.82 116 241 2.357

-3 27 211.4 37 99 32.94 77 171 7.566 117 243 2.294

-2 28 200.7 38 100 31.62 78 172 7.321 118 244 2.233

-1 30 190.5 39 102 30.36 79 174 7.086 119 246 2.174

0 32 180.9 40 104 29.15 80 176 6.859 120 248 2.117

1 34 171.9 41 106 28 81 178 6.641 121 250 2.061

2 36 163.3 42 108 26.9 82 180 6.43 122 252 2.007

3 37 155.2 43 109 25.86 83 181 6.228 123 253 1.955

4 39 147.6 44 111 24.85 84 183 6.033 124 255 1.905

5 41 140.4 45 113 23.89 85 185 5.844 125 257 1.856

6 43 133.5 46 115 22.89 86 187 5.663 126 259 1.808

7 45 127.1 47 117 22.1 87 189 5.488 127 261 1.762

8 46 121 48 118 21.26 88 190 5.32 128 262 1.717

9 48 115.2 49 120 20.46 89 192 5.157 129 264 1.674

10 50 109.8 50 122 19.69 90 194 5 130 266 1.632

11 52 104.6 51 124 18.96 91 196 4.849 　　　

12 54 99.69 52 126 18.26 92 198 4.703 　　　

13 55 95.05 53 127 17.58 93 199 4.562 　　　

14 57 90.66 54 129 16.94 94 201 4.426 　　　

15 59 86.49 55 131 16.32 95 203 4.294 　　　

16 61 82.54 56 133 15.73 96 205 4.167 　　　

17 63 78.79 57 135 15.16 97 207 4.045 　　　

18 64 75.24 58 136 14.62 98 208 3.927 　　　

19 66 71.86 59 138 14.09 99 210 3.812 　　　

 Appendix 3 

ii) Other Temperature Sensors Resistance Value Table (°C – K)

°C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm

-20 -4 115.266 20 68 12.6431 60 140 2.35774 100 212 0.62973

-19 -2 108.146 21 70 12.0561 61 142 2.27249 101 214 0.61148

-18 0 101.517 22 72 11.5 62 144 2.19073 102 216 0.59386

-17 1 96.3423 23 73 10.9731 63 145 2.11241 103 217 0.57683

-16 3 89.5865 24 75 10.4736 64 147 2.03732 104 219 0.56038

-15 5 84.219 25 77 10 65 149 1.96532 105 221 0.54448

-14 7 79.311 26 79 9.55074 66 151 1.89627 106 223 0.52912

-13 9 74.536 27 81 9.12445 67 153 1.83003 107 225 0.51426

-12 10 70.1698 28 82 8.71983 68 154 1.76647 108 226 0.49989

-11 12 66.0898 29 84 8.33566 69 156 1.70547 109 228 0.486

-10 14 62.2756 30 86 7.97078 70 158 1.64691 110 230 0.47256

-9 16 58.7079 31 88 7.62411 71 160 1.59068 111 232 0.45957

-8 18 56.3694 32 90 7.29464 72 162 1.53668 112 234 0.44699

-7 19 52.2438 33 91 6.98142 73 163 1.48481 113 235 0.43482

-6 21 49.3161 34 93 6.68355 74 165 1.43498 114 237 0.42304

-5 23 46.5725 35 95 6.40021 75 167 1.38703 115 239 0.41164

-4 25 44 36 97 6.13059 76 169 1.34105 116 241 0.4006

-3 27 41.5878 37 99 5.87359 77 171 1.29078 117 243 0.38991

-2 28 39.8239 38 100 5.62961 78 172 1.25423 118 244 0.37956

-1 30 37.1988 39 102 5.39689 79 174 1.2133 119 246 0.36954

0 32 35.2024 40 104 5.17519 80 176 1.17393 120 248 0.35982

1 34 33.3269 41 106 4.96392 81 178 1.13604 121 250 0.35042

2 36 31.5635 42 108 4.76253 82 180 1.09958 122 252 0.3413

3 37 29.9058 43 109 4.5705 83 181 1.06448 123 253 0.33246

4 39 28.3459 44 111 4.38736 84 183 1.03069 124 255 0.3239

5 41 26.8778 45 113 4.21263 85 185 0.99815 125 257 0.31559

6 43 25.4954 46 115 4.04589 86 187 0.96681 126 259 0.30754

7 45 24.1932 47 117 3.88673 87 189 0.93662 127 261 0.29974

8 46 22.5662 48 118 3.73476 88 190 0.90753 128 262 0.29216

9 48 21.8094 49 120 3.58962 89 192 0.8795 129 264 0.28482

10 50 20.7184 50 122 3.45097 90 194 0.85248 130 266 0.2777

11 52 19.6891 51 124 3.31847 91 196 0.82643 131 268 0.27078

12 54 18.7177 52 126 3.19183 92 198 0.80132 132 270 0.26408

13 55 17.8005 53 127 3.07075 93 199 0.77709 133 271 0.25757

14 57 16.9341 54 129 2.95896 94 201 0.75373 134 273 0.25125

15 59 16.1156 55 131 2.84421 95 203 0.73119 135 275 0.24512

16 61 15.3418 56 133 2.73823 96 205 0.70944 136 277 0.23916

17 63 14.6181 57 135 2.63682 97 207 0.68844 137 279 0.23338

18 64 13.918 58 136 2.53973 98 208 0.66818 138 280 0.22776

19 66 13.2631 59 138 2.44677 99 210 0.64862 139 282 0.22231

 Appendix 4 

iii) System Pressure Table-R454B

Pressure Temperature Pressure Temperature

Kpa bar PSI °C °F Kpa bar PSI °C °F

58.196 0.58 8.44 -60 -76 935.23 9.35 135.64 8 46.4

61.517 0.62 8.92 -59 -74.2 963.75 9.64 139.78 9 48.2

64.988 0.65 9.43 -58 -72.4 992.93 9.93 144.01 10 50

68.615 0.69 9.95 -57 -70.6 1022.8 10.23 148.34 11 51.8

72.402 0.72 10.50 -56 -68.8 1053.3 10.53 152.76 12 53.6

76.354 0.76 11.07 -55 -67 1084.5 10.85 157.29 13 55.4

80.478 0.80 11.67 -54 -65.2 1116.4 11.16 161.91 14 57.2

84.776 0.85 12.30 -53 -63.4 1149 11.49 166.64 15 59

89.256 0.89 12.95 -52 -61.6 1182.3 11.82 171.47 16 60.8

93.923 0.94 13.62 -51 -59.8 1216.3 12.16 176.40 17 62.6

98.781 0.99 14.33 -50 -58 1251.1 12.51 181.45 18 64.4

103.84 1.04 15.06 -49 -56.2 1286.6 12.87 186.60 19 66.2

109.1 1.09 15.82 -48 -54.4 1322.8 13.23 191.85 20 68

114.56 1.15 16.61 -47 -52.6 1359.9 13.60 197.23 21 69.8

120.25 1.20 17.44 -46 -50.8 1397.7 13.98 202.71 22 71.6

126.15 1.26 18.30 -45 -49 1436.3 14.36 208.31 23 73.4

132.28 1.32 19.18 -44 -47.2 1475.7 14.76 214.02 24 75.2

138.64 1.39 20.11 -43 -45.4 1515.9 15.16 219.85 25 77

145.24 1.45 21.06 -42 -43.6 1557 15.57 225.82 26 78.8

152.09 1.52 22.06 -41 -41.8 1598.9 15.99 231.89 27 80.6

159.18 1.59 23.09 -40 -40 1641.6 16.42 238.09 28 82.4

166.54 1.67 24.15 -39 -38.2 1685.2 16.85 244.41 29 84.2

174.15 1.74 25.26 -38 -36.4 1729.7 17.30 250.86 30 86

182.04 1.82 26.40 -37 -34.6 1775 17.75 257.43 31 87.8

190.2 1.90 27.59 -36 -32.8 1821.3 18.21 264.15 32 89.6

198.65 1.99 28.81 -35 -31 1868.4 18.68 270.98 33 91.4

207.39 2.07 30.08 -34 -29.2 1916.5 19.17 277.95 34 93.2

216.42 2.16 31.39 -33 -27.4 1965.6 19.66 285.08 35 95

225.76 2.26 32.74 -32 -25.6 2015.5 20.16 292.31 36 96.8

235.41 2.35 34.14 -31 -23.8 2066.5 20.67 299.71 37 98.6

245.37 2.45 35.59 -30 -22 2118.4 21.18 307.24 38 100.4

255.67 2.56 37.08 -29 -20.2 2171.3 21.71 314.91 39 102.2

266.29 2.66 38.62 -28 -18.4 2225.2 22.25 322.73 40 104

277.25 2.77 40.21 -27 -16.6 2280.2 22.80 330.70 41 105.8

288.56 2.89 41.85 -26 -14.8 2336.1 23.36 338.81 42 107.6

300.22 3.00 43.54 -25 -13 2393.2 23.93 347.09 43 109.4

312.24 3.12 45.28 -24 -11.2 2451.3 24.51 355.52 44 111.2

324.63 3.25 47.08 -23 -9.4 2510.4 25.10 364.09 45 113

337.39 3.37 48.93 -22 -7.6 2570.7 25.71 372.84 46 114.8

350.54 3.51 50.84 -21 -5.8 2632.1 26.32 381.74 47 116.6

364.08 3.64 52.80 -20 -4 2694.7 26.95 390.82 48 118.4

378.02 3.78 54.83 -19 -2.2 2758.3 27.58 400.04 49 120.2

392.37 3.92 56.91 -18 -0.4 2823.2 28.23 409.46 50 122

407.13 4.07 59.05 -17 1.4 2889.3 28.89 419.04 51 123.8

 Appendix 5 

422.31 4.22 61.25 -16 3.2 2956.5 29.57 428.79 52 125.6

437.92 4.38 63.51 -15 5 3025 30.25 438.72 53 127.4

453.98 4.54 65.84 -14 6.8 3094.7 30.95 448.83 54 129.2

470.47 4.70 68.23 -13 8.6 3165.7 31.66 459.13 55 131

487.43 4.87 70.69 -12 10.4 3238.1 32.38 469.63 56 132.8

504.84 5.05 73.22 -11 12.2 3311.7 33.12 480.30 57 134.6

522.73 5.23 75.81 -10 14 3386.7 33.87 491.18 58 136.4

541.1 5.41 78.48 -9 15.8 3463 34.63 502.25 59 138.2

559.95 5.60 81.21 -8 17.6 3540.7 35.41 513.52 60 140

579.31 5.79 84.02 -7 19.4 3619.9 36.20 525.00 61 141.8

599.16 5.99 86.90 -6 21.2 3700.5 37.01 536.69 62 143.6

619.54 6.20 89.85 -5 23 3782.7 37.83 548.61 63 145.4

640.43 6.40 92.88 -4 24.8 3866.3 38.66 560.74 64 147.2

661.86 6.62 95.99 -3 26.6 3951.5 39.52 573.10 65 149

683.82 6.84 99.18 -2 28.4 4038.3 40.38 585.69 66 150.8

706.34 7.06 102.44 -1 30.2 4126.8 41.27 598.52 67 152.6

729.41 7.29 105.79 0 32 4217 42.17 611.60 68 154.4

753.06 7.53 109.22 1 33.8 4309 43.09 624.95 69 156.2

777.28 7.77 112.73 2 35.6 4402.9 44.03 638.56 70 158

802.08 8.02 116.33 3 37.4 4498.7 44.99 652.46 71 159.8

827.48 8.27 120.01 4 39.2 4596.5 45.97 666.64 72 161.6

853.49 8.53 123.78 5 41 4696.5 46.97 681.15 73 163.4

880.11 8.80 127.64 6 42.8 4798.9 47.99 696.00 74 165.2

907.35 9.07 131.60 7 44.6 4904.1 49.04 711.25 75 167

Mrcool DUCT12HP230BO Olympus Ceiling Duct Air Handler with 12000 BTU Capacity, Heat Pump, and 230 Volts in Silver Outdoor Unit Required to Operate

Product's Documents

Service Manual.

Specifications

Mrcool DUCT12HP230BO Questions and Answers

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