ENGLISH FRANÇAIS
ESPAÑOL
INSTALLATION MANUAL
AIR
CONDITIONER
P/NO : MFL63748905
Please read this installation manual completely before installing the product.
Installation work must be performed in accordance with the national wiring
standards by authorized personnel only.
Please retain this installation manual for future reference after reading it
thoroughly.
Water Mini series
www.lg.com
Copyright © 2013 - 2018 LG Electronics Inc. All Rights Reserved.
2 Outside Unit
ARWN Series Outside unit Installation Manual
TABLE OF CONTENTS
Safety Precautions .........................................................................................................3
Installation Process .......................................................................................................7
Outside units Information..............................................................................................8
Alternative Refrigerant R410A ......................................................................................9
Select the Best Location................................................................................................9
Installation space ........................................................................................................10
Water control ................................................................................................................11
Lifting method ..............................................................................................................13
Installation ....................................................................................................................14
Refrigerant piping installation ....................................................................................18
Device protection unit..................................................................................................21
Refrigerant piping system ..........................................................................................23
Y branch pipe and header branch pipe type .............................................................37
Leakage test and vacuum ...........................................................................................39
Electrical Wiring ...........................................................................................................41
Test Run ........................................................................................................................55
Cooling tower applied method ...................................................................................62
Caution For Refrigerant Leak......................................................................................63
Water Solenoid Valve Control .....................................................................................65
Variable Water Flow Control KIT(Accessory) ............................................................66
ENGLISH
Installation Manual 3
Safety Precautions
Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must
be followed.
n Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.
n Meanings of symbols used in this manual are as shown below.
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
Be sure not to do.
Be sure to follow the instruction.
Installation
• Have all electric work done by a licensed electrician according to "Electric Facility Engineering Standard" and
"Interior Wire Regulations" and the instructions given in this manual and always use a special circuit.
- If the power source capacity is inadequate or electric work is performed improperly, electric shock or fire may
result.
• Ask the dealer or an authorized technician to install the air conditioner.
- Improper installation by the user may result in water leakage, electric shock, or fire.
• Always ground the product.
- There is risk of fire or electric shock.
• Always install a dedicated circuit and breaker.
- Improper wiring or installation may cause fire or electric shock.
• For re-installation of the installed product, always contact a dealer or an Authorized Service Center.
- There is risk of fire, electric shock, explosion, or injury.
• Do not install, remove, or re-install the unit by yourself (customer).
- There is risk of fire, electric shock, explosion, or injury.
• Do not store or use flammable gas or combustibles near the air conditioner.
- There is risk of fire or failure of product.
• Use the correctly rated breaker or fuse.
- There is risk of fire or electric shock.
• Do not install the unit outside.
- Otherwise it may cause fire, electric shock and trouble.
• Do not install the product on a defective installation stand.
- It may cause injury, accident, or damage to the product.
• When installing and moving the air conditioner to another site, do not charge it with a different refrigerant from the
refrigerant specified on the unit.
- If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction and the
unit may be damaged.
• Do not reconstruct to change the settings of the protection devices.
- If the pressure switch, thermal switch, or other protection device is shorted and operated forcibly, or parts other
than those specified by LGE are used, fire or explosion may result.
• Ventilate before operating air conditioner when gas leaked out.
4 Outside Unit
Safety Precautions
- It may cause explosion, fire, and burn.
• Securely install the cover of control box and the panel.
- If the cover and panel are not installed securely, dust or water may enter the outside unit and fire or electric shock
may result.
• If the air conditioner is installed in a small room, measures must be taken to prevent the refrigerant concentration
from exceeding the safety limit when the refrigerant leaks.
- Consult the dealer regarding the appropriate measures to prevent the safety limit from being exceeded. Should
the refrigerant leak and cause the safety limit to be exceeded, harzards due to lack of oxygen in the room could
result.
• Use a vacuum pump or Inert (nitrogen) gas when doing leakage test or air purge. Do not compress air or Oxygen
and Do not use Flammable gases. Otherwise, it may cause fire or explosion.
- There is the risk of death, injury, fire or explosion.
Operation
• Do not damage or use an unspecified power cord.
- There is risk of fire, electric shock, explosion, or injury.
• Use a dedicated outlet for this appliance.
- There is risk of fire or electrical shock.
• Be cautious that water could not enter the product.
- There is risk of fire, electric shock, or product damage.
• Do not touch the power switch with wet hands.
- There is risk of fire, electric shock, explosion, or injury.
• When the product is soaked (flooded or submerged), contact an Authorized Service Center.
- There is risk of fire or electric shock.
• Be cautious not to touch the sharp edges when installing.
- It may cause injury.
• Take care to ensure that nobody could step on or fall onto the outside unit.
- This could result in personal injury and product damage.
• Do not open the inlet grille of the product during operation. (Do not touch the electrostatic filter, if the unit is so
equipped.)
- There is risk of physical injury, electric shock, or product failure.
Installation
• Always check for gas (refrigerant) leakage after installation or repair of product.
- Low refrigerant levels may cause failure of product.
• Do not install the product where the noise or hot air from the outside unit could damage the neighborhoods.
- It may cause a problem for your neighbors.
• Keep level even when installing the product.
- To avoid vibration or water leakage.
• Do not install the unit where combustible gas may leak.
- If the gas leaks and accumulates around the unit, an explosion may result.
• Use power cables of sufficient current carrying capacity and rating.
- Cables that are too small may leak, generate heat, and cause a fire.
• Do not use the product for special purposes, such as preserving foods, works of art, etc. It is a consumer air condi-
tioner, not a precision refrigeration system.
ENGLISH
Installation Manual 5
Safety Precautions
- There is risk of damage or loss of property.
• Keep the unit away from children. The heat exchanger is very sharp.
- It can cause the injury, such as cutting the finger. Also the damaged fin may result in degradation of capacity.
• When installing the unit in a hospital, communication station, or similar place, provide sufficient protection against
noise.
- The inverter equipment, private power generator, high-frequency medical equipment, or radio communication
equipment may cause the air conditioner to operate erroneously, or fail to operate. On the other hand, the air con-
ditioner may affect such equipment by creating noise that disturbs medical treatment or image broadcasting.
• Do not install the product where it is exposed to sea wind (salt spray) directly.
- It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins, could cause
product malfunction or inefficient operation.
Operation
• Do not use the air conditioner in special environments.
- Oil, steam, sulfuric smoke, etc. can significantly reduce the performance of the air conditioner or damage its
parts.
• Do not block the inlet or outlet.
- It may cause failure of appliance or accident.
• Make the connections securely so that the outside force of the cable may not be applied to the terminals.
- Inadequate connection and fastening may generate heat and cause a fire.
• Be sure the installation area does not deteriorate with age.
- If the base collapses, the air conditioner could fall with it, causing property damage, product failure, or personal
injury.
• Be very careful about product transportation.
- Only one person should not carry the product if it weighs more than 20kg.
- Some products use PP bands for packaging. Do not use any PP bands for a means of transportation. It is dan-
gerous.
- Do not touch the heat exchanger fins. Doing so may cut your fingers.
- When transporting the outside unit, suspending it at the specified positions on the unit base. Also support the out-
side unit at four points so that it cannot slip sideways.
• Safely dispose of the packing materials.
- Packing materials, such as nails and other metal or wooden parts, may cause stabs or other injuries.
- Tear apart and throw away plastic packaging bags so that children may not play with them. If children play with a
plastic bag which was not torn apart, they face the risk of suffocation.
• Turn on the power at least 6hours before starting operation.
- Starting operation immediately after turning on the main power switch can result in severe damage to internal
parts. Keep the power switch turned on during the operational season.
• Do not touch any of the refrigerant piping during and after operation.
- It can cause a burn or frostbite.
• Do not operate the air conditioner with the panels or guards removed.
- Rotating, hot, or high-voltage parts can cause injuries.
• Do not directly turn off the main power switch after stopping operation.
- Wait at least 5minutes before turning off the main power switch. Otherwise it may result in water leakage or other
problems.
• Auto-addressing should be done in condition of connecting the power of all indoor and outdoour units. Auto-
addressing should also be done in case of changing the indoor unit PCB.
• Use a firm stool or ladder when cleaning or maintaining the air conditioner.
- Be careful and avoid personal injury.
6 Outside Unit
Safety Precautions
When wiring:
Electrical shock can cause severe personal injury or death. Only a qualified,
experienced electrician should attempt to wire this system.
• Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked.
• Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and inadequate grounding can cause accidental injury or death.
• Ground the unit following local electrical codes.
• Connect all wiring tightly. Loose wiring may cause overheating at connection points and a possible fire hazard.
• The choice of materials and installations must comply with the applicable local/national or international
standards.
When transporting:
Be careful when picking up and moving the indoor and outside units. Get a partner to help, and
bend your knees when lifting to reduce strain on your back. Sharp edges or thin aluminum fins on
the air conditioner can cut your finger.
When installing...
... in a wall: Make sure the wall is strong enough to hold the unit's weight.
It may be necessary to construct a strong wood or metal frame to provide added support.
... in a room: Properly insulate any tubing run inside a room to prevent "sweating" that can cause
dripping and water damage to wall and floors.
... in moist or uneven locations: Use a raised concrete pad or concrete blocks provide a solid,
level foundation for the outside unit. This prevents water damage and abnormal vibration.
... in an area with high winds: Securely anchor the outside unit down with bolts and a metal
frame. Provide a suitable air baffle.
... in a snowy area(for Heat Pump Model): Install the outside unit on a raised platform that is
higher than drifting snow. Provide snow vents.
When connecting refrigerant tubing
• Keep all tubing runs as short as possible.
• Use the flare method for connecting tubing.
• Check carefully for leaks before starting the test run.
When servicing
• Turn the power OFF at the main power box(mains) before opening the unit to check or repair
electrical parts and wiring.
• Keep your fingers and clothing away from any moving parts.
• Clean up the site after you finish, remember to check that no metal scraps or bits of wiring have
been left inside the unit being serviced.
WARNING
WARNING
• Refer to local code for all wiring size.
• Installation or repairs made by unqualified persons can result in hazards to you and others.
Installation of all field wiring and components MUST conform with local building codes or, in the absence of local
codes, with the National Electrical Code 70 and the National Building Construction and Safety Code or Canadian
Electrical code and National Building Code of Canada.
• The information contained in the manual is intended for use by a qualified service technician familiar with safety
procedures and equipped with the proper tools and test instruments.
• Failure to carefully read and follow all instructions in this manual can result in equipment malfunction, property
damage, personal injury and/or death.
Installation Process
ENGLISH
Installation Manual 7
Installation Process
The foundation must be level even
Outside unit foundation work
Avoid short circuits and ensure
sufficient space is allowed for service
Installation of outside unit
Refer to automatic addressing flowchart
Automatic addressing of indoor unit
In the final check for 24hours at 3.8MPa (38.7kgf/cm
2
) there must be no drop in pressure.
Airtight test
Multiple core cable must not be used.
(suitable cable should be selected)
Electrical work
(connection circuits and drive circuits)
Make sure no gaps are left where
the insulating materials are joined
Heat insulation work
Make sure airflow is sufficient
Duct work
Special attention to dryness,
cleanness and tightness
Refrigerant piping work
Check model name to make
sure the fitting is made correctly
Installation of indoor unit
Take account of gradient
of drain piping
Sleeve and insert work
Make relationship between outside, indoor, remote controller, and option connections clear.
(Prepare control circuit diagram)
Preparation of contract drawings
Indicate clearly who is to be responsible for switch settings
Determination of division work
The vacuum pump used must have a capacity of reaching at least 5torr, more than 1hour
Vacuum drying
Recharge correctly as calculated in this manual. and record the amount of added refrigerant
Additional charge of refrigerant
Make sure there are no gaps left between the facing materials used on the ceiling
Fit facing panels
Run each indoor unit in turn to make sure the pipe work has been fitted correctly
Test run adjustment
Explain the use of the system as clearly as possible to your customer and make sure all relevant
documentation is in order
Transfer to customer with explanation
Preheat the crank case with the electrical heater for more than 6hours.
• The above list indicates the order in which the individual work operations are normally carried out but this order may be
varied where local conditions warrants such change.
• The wall thickness of the piping should comply with the relevant local and national regulations for the designed pres-
sure 3.8MPa.
• Since R410A is a mixed refrigerant, the required additional refrigerant must be charged in its liquid state.(If the refriger-
ant is charged in its gaseous state, its composition changes and the system will not work properly.)
8 Outside Unit
Outside units Information
Outside units Information
Power Supply: Outside Unit (1Ø, 208/230V, 60Hz)
Ratio of the connectable Indoor Units to the Outside: Within 50 ~ 130%
Ratio of running Indoor Units to the Outside: Within 10 ~ 100%
A combination operation over 100% cause to reduce each indoor unit capacity.
Model (HP) 456
Model
ARWN038GA2 ARWN048GA2 ARWN053GA2
Refrigerant
Product charge kg (lbs) 1.0 (2.2) 1.0 (2.2) 1.0 (2.2)
CF (Correction Factoer)
kg (lbs) - - -
Number of maxmum connectable indoor units
6 8 9
Net Weight kg (lbs) 76 (168) 76 (168) 76 (168)
Dimensions
(WxHxD)
mm 520 X 1,080 X 330 520 X 1,080 X 330 520 X 1,080 X 330
inch 20
1
/2 × 42
1
/2 × 13 20
1
/2 × 42
1
/2 × 13 20
1
/2 × 42
1
/2 × 13
Connecting
Pipes
Liquid
Ø, mm (inch)
9.52 (3/8) 9.52 (3/8) 9.52 (3/8)
Gas
Ø, mm (inch)
19.05 (3/4) 19.05 (3/4) 19.05 (3/4)
For Mexico:
Model ARWN~~~GA2: Nominal voltage: 220 V~ 60 Hz
Alternative Refrigerant R410A
ENGLISH
Installation Manual 9
Select the Best Location
Select space for installing outside unit, which will meet the following conditions:
• No direct thermal radiation from other heat sources
• No possibility of annoying neighbors by noise from unit
• No exposition to strong wind
• With strength which bears weight of unit
• Note that drain flows out of unit when heating
• With space for air passage and service work shown next page.
• Because of the possibility of fire, do not install unit to the space where generation, inflow, stagnation, and
leakage of combustible gas is expected.
• Avoid unit installation in a place where acidic solution and spray (sulfur) are often used.
• Do not use unit under any special environment where oil, steam and sulfuric gas exist.
• It is recommended to fence round the outside unit in order to prevent any person or animal from accessing the
outside unit.
• This product is prohibited for outside installation.
• Select installation location considering following conditions to avoid bad condition when additionally performing
defrost operation.
1. Install the outside unit at a place well ventilated and having a lot of sunshine in case of installing the product
at a place with a high humidity in winter (near beach, coast, lake, etc).
(Ex) Rooftop where sunshine always shines.
2. Performance of heating will be reduced and preheat time of the indoor unit may be lengthened in case of
installing the outside unit in winter at following location:
(1) Shade position with a narrow space
(2) Location with high moisture level in neighboring floor.
(3) Location with high humidity around.
(4) Location where water gathers since the floor is not even.
• The refrigerant R410A has the property of higher operating pressure in comparison with R22.
Therefore, all materials have the characteristics of higher resisting pressure than R22 ones and this characteristic
should be also considered during the installation.
R410A is an azeotrope of R32 and R125 mixed at 50:50, so the ozone depletion potential (ODP) of R410A is 0.
Alternative Refrigerant R410A
• The wall thickness of the piping should comply with the relevant local and national regulations for the designed
pressure 3.8MPa
• Since R410A is a mixed refrigerant, the required additional refrigerant must be charged in its liquid state.
If the refrigerant is charged in its gaseous state, its composition changes and the system will not work properly.
• Do not place the refrigerant container under the direct rays of the sun to prevent it from exploding.
• For high-pressure refrigerant, any unapproved pipe must not be used.
• Do not heat pipes more than necessary to prevent them from softening.
• Be careful not to install wrongly to minimize economic loss because it is expensive in comparison with R22.
10 Outside Unit
Installation space
Installation space
Required the minimum space as shown below for installation and
check. If the space is not fit on this drawing, consult with LG.
: Service area
20 (25/32)
100 (3-15/16)
193 (7-19/32)
523 (20-19/32)
H-Beam Support
[Unit : mm(inch)]
600 (23-5/8)
379 (14-29/32)
1,080 (42-17/32)
100 (3-15/16)
100 (3-15/16)
20 (25/32)
<Front View>
Water pipe
installation
space
<Top View>
Product
(Outside unit)
Service area
(Front)
ENGLISH
Installation Manual 11
Water control
Water control
Water control
• Keep the water temperature between 10~45°C (50~113°F). Other it may cause the breakdown.
- Standard water supply temperature is 30°C (86°F) for Cooling and 20°C (68°F) for heating.
• Properly control the water velocity. Otherwise it may cause the noise, pipe vibration or pipe contraction, expansion
according to the temperature. Use the same water pipe size connected with the product or more.
• Refer to the water source pipe diameter and water velocity table below. As the water velocity is fast, air bubble will
increase.
• Be careful of the water purity control. Otherwise it may cause the breakdown due to water pipe corrosion.
(Refer to 'Standard Table for Water Purity Control')
• In case the water temperature is above 40°C (104°F), it is good to prevent the corrosion by adding the anticorrosive
agent.
• Install the pipe, valve and gauge sensor in the space where it is easy to maintain. Install the water valve in the low
position for drain, if required.
• Be careful not to let air in. If so, the water velocity will be unstable in the circulation, pump efficiency will also
decrease and may cause the piping vibration. Therefore, install the air purge where it may generate the air.
• Choose the following anti freezing methods. Otherwise, it will be dangerous for the pipe to break in the winter.
- Circulate the water with the pump before dropping the temperature.
- Keep the normal temperature by boiler.
- When the cooling tower is not operated for a long time, drain the water in the cooling tower.
- Use an anti-freeze. (For using an anti freeze, change the DIP switch on main PCB in outside unit.)
- Refer to the additive amount about freezing temperature as in the table given below.
• In addition to anti freeze, it may cause the change of the pressure in the water system and the low performance of
the product.
• Make sure to use the closed cooling type tower.
When applying the open type cooling tower, use a 2
nd
heat exchanger to make the water supply system a closed
type system.
Diameter [mm(inch)] Velocity range (m/s)
< 50 (1-31/32) 0.6 ~ 1.2
50 (1-31/32) ~ 100 (5-7/8) 1.2 ~ 2.1
100100 (5-7/8) < 2.1 ~ 2.7
Minimum temperature for anti freezing [°C (°F)]
0 -5 (23) -10 (14) -15 (5) -20 (-4) -25
Ethylene glycol (%) 0 12 20 30 - -
Propylene glycol (%) 0 17 25 33 - -
Methanol (%) 0 6 12 16 24 30
Anti freeze type
12 Outside Unit
Standard table for water purity control
The water may contain many foreign substances and hence may influence the performance and lifetime of the prod-
uct due to the corrosion of the condenser and water pipe. (Use water source that complies with the below standard
table for water purity control.)
If you use water supply other than the tap water to supply the water for the cooling tower, you must do a water quality
inspection.
• If you use the closed cooling tower, the water quality must be controlled in accordance with the following standard
table.
If you do not control the water quality in accordance with the following standard water quality table, it can cause per-
formance deterioration to the air conditioner and severe problem to the product
[Reference]
(1) The "O" mark for corrosion and scale means that there is possibility of occurrence.
(2) When the water temperature is 40°C or above or when uncoated iron is exposed to the water, it can result in corro-
sion. Therefore adding anti-corrosion agent or removing the air can be very effective.
(3) In case of using the closed type cooling tower, the cooling water and supplementing water must satisfy the water qual-
ity criteria of closed type system in the table.
(4) Supplementing water and supplied water must be supplied with tap water, industrial water and underground water
excluding filtered water, neutral water, soft water etc.
(5) 15 items in the table are general causes of corrosion and scale.
Items
pH(25C)
Conductivity[25C](mS/m)
Chlorine ion(mg CI
-
/l)
Sulfuric acid ion(mg SO
2
-
/l)
Acid demand[pH 4.8] (mg SiO2/l)
Total hardness(mg SiO2/l)
Ca hardness(mg CaCO3/l)
Ion silica(mg SiO2/l)
Fe(mg Fe/l)
Copper(mg Cu/l)
Sulfuric acid ion(mg S
2
/l)
Ammonium ion(mg NH4/l)
Residual chlorine(mg Cl/l)
Free carbon dioxide(mg CO2/l)
Stability index
7.0~8.0
Below 30
Below 50
Below 50
Below 50
Below 70
Below 50
Below 30
Below 1.0
Below 1.0
Must not be detected
Below 0.3
Below 0.25
Below 0.4
-
Below 0.3
Below 0.1
Must not be detected
Below 0.1
Below 0.3
Below 4.0
-
7.0~8.0
Below 30
Below 50
Below 50
Below 50
Below 70
Below 50
Below 30
O
O
O
O
-
-
-
-
O
O
O
O
O
O
O
O
-
-
-
-
-
O
O
O
-
O
O
O
O
O
Closed type
Basic Item
Reference Item
Effect
Circulating water Supplemented water Corrosion Scale
4
+
Water control
ENGLISH
Installation Manual 13
Lifting method
Lifting method
• When carrying the unit suspended, pass the ropes under the unit and use the two suspension points each
at the front and rear.
• Always lift the unit with ropes attached at fours points so that impact is not applied to the unit.
• Attach the ropes to the unit at an angle of 40° or less
• Do not have only one person carry product if it is more than 20kg (44.1lbs).
• PP bands are used to pack some products. Do not use them as a means for transportation because they
are dangerous.
• Tear the plastic packaging bag and scrap it so that children cannot play with it. Otherwise plastic pack-
aging bag may suffocate children.
• When carrying in outside unit, be sure to support it at four points. Carrying in and lifting with 3-point sup-
port may make outside unit unstable, resulting in a fall of it.
• When carrying with the forklift, be careful not to drop the product.
40° or less
Rope supporter
A
B
Sub line
WARNING
CAUTION
14 Outside Unit
Installation
Location of anchor bolt
Installation
• Be sure to install unit in a place strong enough to withstand its weight.
Any lack of strength may cause unit to fall down, resulting in a personal injury.
• Have installation work in order to protect against a strong wind and earthquake. Any installation
deficiency may cause unit to fall down, resulting in a personal injury.
• Especially take care for support strength of the floor surface, water drain processing (processing of
water flown out from the outside unit during operation) and paths of the pipe and wiring when mak-
ing a base support.
WARNING
The location of
anchor bolt
354 (13-15/16)
392 (15-7/16)
[Unit : mm(inch)]
• Check the strength and level of the installation ground so that the unit will not cause any operating vibration or noise
after installation.
• Fix the unit securely by means of the foundation bolts. (Prepare 4sets of M12 foundation bolts, nuts and washers each
which are available on the market.)
• It is best to screw in the foundation bolts until their length are 20mm (25/32inch) from the foundation surface.
[Unit:mm(inch)]
200 (7-7/8)
200 (7-7/8)
Nut
75 (2-31/32)
75 (2-31/32)
Spring washer
Frame
Anti-vibration
materials
Four bolt are
required
3 thread ridges
H-Beam
Concrete
base
100 (3-15/16)
Foundation bolt executing method
Foundation for Installation
ENGLISH
Installation Manual 15
Installation
Preparation of Piping
1) Cut the pipes and the cable.
n Use the accessory piping kit or the pipes purchased
locally.
n Measure the distance between the indoor and the out-
side unit.
n Cut the pipes a little longer than measured distance.
n Cut the cable 1.5m longer than the pipe length.
2) Burrs removal
n Completely remove all burrs from the cut cross section
of pipe/tube.
n Put the end of the copper tube/pipe to downward direc-
tion as you remove burrs in order to avoid to let burrs
drop in the tubing.
3) Flaring work
n Carry out flaring work using flaring tool as shown below.
Firmly hold copper tube in a bar(or die) as indicated
dimension in the table above.
4) Check
n Compare the flared work with figure below.
n If flare is noted to be defective, cut off the flared section
and do flaring work again.
Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following procedure.
Copper
tube
90°
Slanted Uneven Rough
Pipe
Reamer
Point down
Bar
Copper pipe
"A"
<Wing nut type>
<Clutch type>
Inclined
Inside is shining without scratches.
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
Pipe diameter
Inch (mm)
A inch (mm)
Wing nut type Clutch type
Ø1/4 (Ø6.35)
0.04~0.07 (1.1~1.8) 0~0.02 (0~0.5)
Ø3/8 (Ø9.52)
Ø1/2 (Ø12.7)
Ø5/8 (Ø15.88)
16 Outside Unit
Installation
1. Remove the cap and turn the valve counter clockwise with the hexagon wrench.
2. Turn it until the shaft stops.
Do not apply excessive force to the shutoff valve. Doing so may break the valve body, as the valve is not a
backseat type. Always use the special tool.
3. Make sure to tighten the cap securely.
1. Remove the cap and turn the valve clockwise with the hexagon wrench.
2. Securely tighten the valve until the shaft contacts the main body seal.
3. Make sure to tighten the cap securely.
* For the tightening torque, refer to the table on the below.
Precautions when connecting pipes
• See the following table for flare part machining dimensions.
• When connecting the flare nuts, apply refrigerant oil to the inside and outside of the flares and turn them three
or four times at first. (Use ester oil or ether oil.)
• See the following table for tightening torque.(Applying too much torque may cause the flares to crack.)
• After all the piping has been connected, use nitrogen to perform a gas leak check.
Tightening torque
CAUTION
• Always use a charge hose for service port connection.
• After tightening the cap, check that no refrigerant leaks are
present.
• When loosening a flare nut, always use two wrenches in
combination, When connecting the piping, always use a spanner and torque
wrench in combination to tighten the flare nut.
• When connecting a flare nut, coat the flare(inner and outer faces) with oil for
R410A (PVE) and hand tighten the nut 3 to 4 turns as the initial tightening.
Opening shutoff valve
Closing shutoff valve
FLARE SHAPE and FLARE NUT TIGHTENING TORQUE
Shutoff
valve size
Ø6.4
Ø9.5
Ø12.7
Ø15.9
Ø22.2
Ø25.4
13.5-16.5
18-22
14-17
33-39
50-60
62-75
23-27
13.5-16.5
5.4-6.6
Hexagonal
wrench 4mm
Hexagonal
wrench 6mm
Hexagonal
wrench 10mm
8.1-9.9
27-33 36-44
-
11.5-13.9
22-28-
Tightening torque N-m(Turn clockwise to close)
Shaft(valve body)
Gas line piping attached to unit
Cap(Valve lid) Service port Flare nut
90°"
±2
45
°"
±2
A
R=0.4~0.8
pipe size tightening torque(Ncm) A(mm) flare shape
Ø9.5 3270-3990 12.8-13.2
Ø12.7 4950-6030 16.2-16.6
Ø15.9 6180-7540 19.3-19.7
Union
ENGLISH
Installation Manual 17
Installation
1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance
(over 120°C).
2. Precautions in high humidity circumstance:
This air conditioner has been tested according to the
"ISO Conditions with Mist" and confirmed that there is
not any default. However, if it is operated for a long
time in high humid atmosphere (dew point tempera-
ture: more than 23°C), water drops are liable to fall. In
this case, add heat insulation material according to
the following procedure:
• Heat insulation material to be prepared... EPDM
(Ethylene Propylene Diene Methylene)-over 120°C
the heat-resistance temperature.
• Add the insulation over 10mm thickness at high humidity environment.
Indoor unit
Thermal insulator
(accessory)
Fastening band
(accessory)
Refrigerant piping
HEAT INSULATION
18 Outside Unit
Refrigerant piping installation
WARNING
After completing work, securely tighten both service ports and caps so that gas does not leak.
Refrigerant piping installation
WARNING
Always use extreme care to prevent the refrigerant gas (R410A) from leakage while using fire or
flame. If the refrigerant gas comes in contact with the flame from any source, such as a gas stove, it
breaks down and generates a poisonous gas which can cause gas poisoning. Never perform brazing
in an unventilated room. Always conduct an inspection for gas leakage after installation of the refrig-
erant piping has been completed.
① Pipe joint (auxiliary parts): Securely perform brazing with
a nitrogen blow into the service valve port.(Releasing
pressure : 0.02MPa or less)
② Cap: Remove caps and operate valve, etc. After opera-
tion, always reattach caps (tightening torque of valve
cap: 25Nm (250kg-cm) or more). (Don't remove the
internal part of the port)
③ Service port: Make the refrigerant pipe vacuum and
charge it using the service port. Always reattach caps
after completing work (tightening torque of service cap:
14Nm (140kg-cm) or more).
④ Liquid pipe
⑤ Gas pipe
⑥ Elbow joint (field supply)
Cautions in pipe connection/valve operation
Open status when both the pipe and
the valve are in a straight line.
Cut both the pipe and the valve with a
cutter to suit the length
(Don't cut the length of less than 70mm)
CLOSE OPEN
Elbow
Ball Valve(Gas Pipe)
Ball Valve
(Liquid Pipe)
ENGLISH
Installation Manual 19
Refrigerant piping installation
1) Water pipe system diagram
• The water pressure resistance of the water pipe system of this product is 1.98MPa
• When the water pipe passes indoors, make sure to execute heat insulation on the pipe so that water drops do not form on
the outer side of the water pipe.
• The size of the drain pipe must be equal to or larger than the diameter of the connecting product.
- Always install a trap so that the drained water does not back flush.
• Always install a strainer (50Mesh or above) at the entrance of the water pipe. (When sand, trash, rusted pieces get mixed
into the water supply, it can cause problems to the product due to blocking)
- If On/Off valve is applied, by interlocking with outside unit, it can save the energy consumption of pump by blocking the
water supply to the outside unit not operating. Select appropriate valve and install on site if necessary.
• Install a pressure gauge and temperature gauge at the inlet and outlet of the water pipe.
• Flexible joints must be installed not to cause any leakage from the vibration of pipes.
• Install a service port to clean the heat exchanger at the each end of the water inlet and outlet.
• For the components of the water pipe system, always use components above the designed water pressure.
2) Water pipe connection
• The water pipe should be the same size of the connection on the product or more.
• If necessary install the insulation material in the water pipe inlet/outlet to prevent water drop, freeze and to save energy.
(Use the above 20mm thickness PE insulation material.)
• Tightly connect the socket to the water pipe refer to below table for recommended specification.
(Too much torque may cause the damage of the facility.)
Do not directly connect the drain outlet to the water pipe outlet.
(It can cause problems to the product.)
Installation of water pipe
Water pipe
outlet
Gate valve
Gate valve
Service port
Pressure gauge
Temperature gauge
Service port
Strainer
Drain line
Water pipe
Inlet
20 Outside Unit
mm inch (kN) (kgf) (kN) (kgf) (N
.
m) (kgf
.
m)(N
.
m) (kgf
.
m)
12.7 1/2 3.5 350 2.5 250 20 2 35 3.5
19.05 3/4 12 1,200 2.5 250 20 2 115 11.5
25.4 1 1 1.2 1,120 4 400 45 4.5 155 15.5
31.8 1 1/4 14.5 1,450 6.5 650 87.5 8.75 265 26.5
38.1 1 1/2 16.5 1,700 9.5 950 155 16 350 35.5
50.8 2 21.5 2,200 13.5 1,400 255 26 600 61
Pipe thickness Shear stress Tensile stress Bending moment Torque
Water pipe
connection
Water pipe inlet
Water pipe outlet
Refrigerant piping installation
ENGLISH
Installation Manual 21
Device protection unit
Device protection unit
Strainer on water pipe
To protect the water cooling type product, you must install a strainer with 50mesh or more on the heat water supply pipe.
If not installed, it can result in damage of heat exchanger by the following situation.
1. Heat water supply within the plate type heat exchanger is composed of multiple small paths.
2. If you do not use a strainer with 50mesh or more, alien particles can partially block the water paths.
3. When running the heater, the plate type heat exchanger plays the role of the evaporator, and at this time, the temperature of the
coolant side drops to drop the temperature of the heat water supply, which can result in icing point in the water paths.
4. And as the heating process progresses, the water paths can be partially frozen to lead to damage in plate type heat exchanger.
5. As a result of the damage of the heat exchanger from the freezing, the coolant side and the heat water source side will be mixed
to make the product unusable.
Heat Source"
(Water)"
"
Refrigerant"
"
1. Pollution of"
Heat source"
"
2. Partially frozen"
"
3. Damage"
"
Installation of flow switch
• The flow switch must be installed at the horizontal pipe of the heat water supply outlet of the product and check the direc-
tion of the heat water flow before the installation. (Picture 1)
• When connecting the flow switch to the product, remove the jump wire to connect to the communication terminal (4(A) and
4(B)) of the outside unit control box. (Picture 2, 3) (Open the cover of the flow switch and check the wiring diagram before
connecting the wires. The wiring method can differ by the manufacturer of the flow switch.)
• If necessary, adjust the flow rate detection screw after consulting with an expert and adjust to the minimum flow rate
range. (Picture 4) (Minimum flow rate range of this product is 50%. Adjust the flow switch to touch the contact point when
the flow rate reaches 50% of the flow rate.)
- Reference flow rate : 4HP–11GPM, 5HP-13GPM, 6HP-16GPM
Picture 1
Picture 4
Picture 3
3(B) 4(A) 4(B)
Picture 2
Device protection unit
22 Outside Unit
Flow switch work
• It is recommended to install the flow switch to the water collection pipe system
connecting to the outside unit.
(Flow switch acts as the 1st protection device when the heat water is not sup-
plied. If a certain level of water does not flow after installing the flow switch, an
error sign of CH24 error will be displayed on the product and the product will stop
operating.)
• When setting the flow switch, it is recommended to use the product with default
set value to satisfy the minimum flow rate of this product. (The minimum flow rate
range of this product is 50%. Reference flow rate : 4HP–11GPM, 5HP-13GPM,
6HP-16GPM)
• Select the flow switch with the permitted pressure specification considering the
pressure specification of the heat water supply system. (Control signal from out-
side unit is AC 220V.)
1inch or
3/4inch
socket
Cover
Micro-switch
Adjustment screw
Vibration plate
Bellows
Pad
• If the set value does not satisfy the minimum flow rate or if the set value is changed by the user arbitrarily, it can result
in product performance deterioration or serious product problem.
• If the product is operated with the heat water supply not flowing smoothly, it can damage the heat exchanger or cause
serious product problems.
• In case of CH24 or CH180 error, there is a possibility that the plate type heat exchanger is partially frozen inside. In this
case resolve the issue of partial freezing and then operate the product again. (Cause of partial freezing : Insufficient
heat water flow rate, water not supplied, insufficient coolant, alien particle penetrated inside plate type heat exchanger)
• When the product operates while the flow switch touches the contact point at the flow rate range out of the permitted
range, it can cause product performance deterioration or serious product problem.
• Must use the normal closed type flow switch - Circuit of outside unit is normal closed type
Refrigerant piping system
Refrigerant piping system
Y branch method
ENGLISH
Installation Manual 23
• * : Assume equivalent pipe length of Y branch to be 0.5m (1.6ft), that of header to be 1m (3.3ft), calcu-
lation purpose
Example : 5 Indoor Units connected
Ⓐ : Outside Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
L70 (230)
H30 (98.4)
l 40 (131)
[Unit:m(ft)]
h15 (49)
Ú Total pipe length = A+B+C+D+a+b+c+d+e ≤ 145m (475.7ft)
Longest pipe length Equivalent pipe length
A+B+C+D+e ≤ 70m (230ft) * A+B+C+D+e ≤ 90m (295.2ft)
Longest pipe length after 1st branch
B+C+D+e ≤ 40m (131ft)
Difference in height(Outside Unit ÷ Indoor Unit)
H ≤ 30m (98.4ft)
Difference in height (Indoor Unit ÷ Indoor Unit)
h ≤ 15m (49ft)
L
l
H
h
Indoor Unit should be installed at lower position than the header
24 Outside Unit
Refrigerant piping system
Header branch method
n Header Method
Example : 6 Indoor Units connected
Ⓐ : Outside Unit
Ⓑ : 1st branch
Ⓒ : Indoor Units
Ⓓ : Sealed piping
L70 (230)
H30 (98.4)
40 (131)
h15 (49)
[Unit:m(ft)]
WARNING
Pipe length after header branching (a~f)
It is recommended that difference in length of the pipes connected to the Indoor Units is mini-
mized. Performance difference between Indoor Units may occur.
• * : Assume equivalent pipe length of Y branch to be 0.5m (1.6ft), that of header to be 1m (3.3ft), calcu-
lation purpose
Longest pipe length * Equivalent pipe length
A+f ≤ 70m (230ft) A+f ≤ 90m (295.2ft)
Longest pipe length after 1st branch
f ≤ 40m (131ft)
Difference in height(Outside Unit ÷ Indoor Unit)
H ≤ 30m (98.4ft)
Difference in height (Indoor Unit ÷ Indoor Unit)
h ≤ 15m (49ft)
L
l
H
h
Ú Total pipe length = A+a+b+c+d+e+f ≤ 145m (475.7ft)
ENGLISH
Installation Manual 25
Refrigerant piping system
Y/Header branch method
n Combination of Y branch/header method
Example : 5 Indoor Units connected
Ⓐ : Outside Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Header
Ⓕ : Sealed piping
L70 (230)
40 (131)
H30 (98.4)
[Unit:m(ft)]
h15 (49)
Branch pipe can not be used after header
Ú Refrigerant pipe diameter from branch to branch (B,C)
Ú Total pipe length = A+B+C+a+b+c+d+e ≤ 145m (475.7ft)
Longest pipe length * Equivalent pipe length
A+B+b ≤ 70m (230ft) A+B+b ≤ 90m (295.2ft)
Longest pipe length after 1st branch
B+b ≤ 40m (131ft)
Difference in height(Outside Unit ÷ Indoor Unit)
H ≤ 30m (98.4ft)
Difference in height (Indoor Unit ÷ Indoor Unit)
h ≤ 15m (49ft)
L
l
H
h
Downward Indoor Unit total capacity
[kW(Btu/h)]
≤ 5.6 (19,100) Ø6.35 (1/4) Ø12.7 (1/2)
< 16 (54,600) Ø9.52 (3/8) Ø15.88 (5/8)
≤ 22.4 (76,400) Ø9.52 (3/8) Ø19.05 (3/4)
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
WARNING
It is recommended that difference of piping length for pipes connected to the Indoor Unit is
minimized. Performance difference between Indoor Units may occur.
* :
Assume equivalent pipe length of Y branch to be 0.5m (1.6ft), that of header to be 1m (3.3ft), calculation purpose.
CAUTION
It is recommended that indoor unit is installed at lower position than the header.
26 Outside Unit
Refrigerant piping system
The calculation of the additional charge should take into account the length of pipe.
Product Charge (kg(lbs))
Additional charge (kg(lbs))
=
+
+
+
+
+
+=
+
x 0.237lbs/ft
x 0.178lbs/ft
x 0.116lbs/ft
x 0.079lbs/ft
x 0.041lbs/ft
x 0.015lbs/ft
CF(kg(lbs))
(Correction Factor)
If a negative result is obtained from
the calculation, no refrigerant needs
to be added.
A
A B
B
CAUTION
Total liquid pipe (m(ft)): Ø22.2mm (7/8inch)
Total liquid pipe (m(ft)): Ø19.05mm (3/4inch)
Total liquid pipe (m(ft)): Ø15.88mm (5/8inch)
Total liquid pipe (m(ft)): Ø12.7mm (1/2inch)
Total liquid pipe (m(ft)): Ø9.52mm (3/8inch)
Total liquid pipe (m(ft)): Ø6.35mm (1/4inch)
Total amount(kg(lbs))
Outside unit
Header branch
Indoor unit
Ex) 10HP
Additional Charge = A x 0.041 + B x 0.041 + C x 0.041
+ D x 0.041 + E x 0.015 + HR + CF
= 164 x 0.041 + 33 x 0.041 + 33 x 0.041
+ 33 x 0.041 + 33 x 0.015 + 0(CF)
= 11.3lbs (5.1kg)
A : Ø9.52 (3/8), 50m (164ft)
B : Ø9.52 (3/8), 10m (33ft)
C : Ø9.52 (3/8), 10m (33ft)
D : Ø9.52 (3/8), 10m (33ft)
E : Ø 6.35 (1/4), 10m (33ft)
Note:
Fill in the f-gas Label attached on outside about the quantity of the fluorinated greenhouse gases
① Manufacturing site (See Model Name label)
② Installation site (If possible being placed adjacent to the service points for the addition or removal of refrigerant)
③ The total Charge (①+②)
# : Use only ARNU153BGA2, ARNU183BGA2, ARNU243BGA2
##: Use only ARNU093TPAA, ARNU123TPAA, ARNU153TPAA, ARNU183TNAA, ARNU243TNAA
n Correction factor of Indoor unit
(Unit : lbs)
Capacity (Btu/h)
Type
5k 7k 9k 12k 15k 18k 24k 28k 30k 36k 42k 48k 54k
Ceiling Consealed Duct(Low Static)
0.37 0.37 0.37 0.37 0.82 0.82
Ceiling Consealed Duct(High
Static)
0.57 0.57 0.57
0.57
0.97
#
0.57
0.97
#
0.57
0.97
#
0.97 0.97 0.97 1.37 1.37
Wall Mounted(ARTCOOL Mirror)
0.53 0.53 0.53 0.53 0.62 0.62
1way Ceiling Cassette
0.44 0.44 0.44
2way Ceiling Cassette
0.35 0.35
4way Ceiling Cassette
0.40 0.40
0.55
1.17
##
0.55
1.17
##
0.71
1.17
##
0.71
1.48
##
1.06
1.48
##
1.06 1.41 1.41 1.41
Floor Standing
0.37 0.37 0.37 0.37 0.82 0.82
Ceiling & Floor
0.22 0.22
Ceiling Suspended
0.77 0.77
Vertical AHU
1.04
1.04 1.04 1.04 1.57 2.00 2.00 2.00
Calculation of amount of refrigerant
ENGLISH
Installation Manual 27
Refrigerant piping system
WARNING
Regulation for refrigerant leakage
: the amount of refrigerant leakage should satisfy the following equation for human safety.
If the above equation can not be satisfied, then follow the following steps.
- Selection of air conditioning system: select one of the next
1. Installation of effective opening part
2. Reconfirmation of Outside Unit capacity and piping length
3. Reduction of the amount of refrigerant
4. Installation of 2 or more security device (alarm for gas leakage)
- Change Indoor Unit type
: installation position should be over 2m (6.6ft) from the floor (Wall mounted type ’ Cassette type)
- Adoption of ventilation system
: choose ordinary ventilation system or building ventilation system
- Limitation in piping work
: Prepare for earthquake and thermal stress
WARNING
Refer to model information since the CF Value of correction factor differs depending on model.
CAUTION
If a negative result is obtained from the calculation, no refrigerant needs to be added.
Total amount of refrigerant in the system
≤ 0.44kg/m
3
(0.028lbs/ft
3
)
Volume of the room at which Indoor Unit of the least capacity is installed
Refrigerant piping system
28 Outside Unit
Distribution Method
1. Line Distribution
2. Vertical Distribution
Ensure that the branch pipes are attached vertically.
3. The others
Header
1st
1st
1st
Main pipe
Distribution
2nd
2nd
3rd
2nd
Main pipe
Distribution
1st
3rd
3rd main pipe distribution
2nd
Refrigerant piping system
ENGLISH
Installation Manual 29
To Outside Unit
Sealed Piping
A
A
B
A
B
1. Use the following materials for refrigerant piping.
• Material: Seamless phosphorous deoxidized copper pipe
• Wall thickness : Comply with the relevant local and national regulations for the designed pressure
3.8MPa. We recommend the following table as the minimum wall thickness.
2. Commercially available piping often contains dust and other materials. Always blow it clean with a dry inert
gas.
3. Use carefully to prevent dust, water or other contaminants from entering the piping during installation.
4. Reduce the number of bending portions as much as possible, and make bending radius as big as possible.
5. Always use the branch piping set shown below, which are sold separately.
6. If the diameters of the branch piping of the designated refrigerant piping differs, use a pipe cutter to cut
the connecting section and then use an adapter for connecting different diameters to connect the piping.
7. Always observe the restrictions on the refrigerant piping (such as rated length, difference in height, and
piping diameter).
Failure to do so can result in equipment failure or a decline in heating/cooling performance.
8. A second branch cannot be made after a header. (These are shown by .)
9. The Multi V will stop due to an abnormality like excessive or insufficient refrigerant. At such a time, always
properly charge the unit. When servicing, always check the notes concerning both the piping length and
the amount of additional refrigerant.
10. Never perform a pump down. This will not only damage the compressor but also deteriorate the
performance.
11. Never use refrigerant to perform an air purge. Always evacuate using a vacuum pump.
Caution
ARBLN01621 ARBLN03321 ARBL054 ARBL057 ARBL1010
ARBLN07121 ARBLN14521 ARBL104 ARBL107 ARBL2010
Y branch
Header
4 branch 7 branch 10 branch
Outer diameter
[mm(inch)]
Minimum thickness
[mm(inch)]
6.35
(1/4)
9.52
(3/8)
12.7
(1/2)
15.88
(5/8)
19.05
(3/4)
22.2
(7/8)
25.4
(1)
28.58
(1-1/8)
31.8
(1-1/4)
34.9
(1-3/8)
38.1
(1-1/2)
41.3
(1-15/16)
0.8
(0.03)
0.8
(0.03)
0.8
(0.03)
0.99
(3.25)
0.99
(0.04)
0.99
(0.04)
0.99
(0.04)
0.99
(0.04)
1.1
(0.04)
1.21
(0.05)
1.35
(0.05)
1.43
(0.06)
30 Outside Unit
Refrigerant piping system
WARNING
When installing and moving the air conditioner to another site, be sure to make recharge refrigerant
after perfect evacuation.
- If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction and
the unit may be damaged.
- After selecting diameter of the refrigerant pipe to suit total capacity of the indoor unit connected after
branching, use an appropriate branch pipe set according to the pipe diameter of the indoor unit and the
installation pipe drawing.
WARNING
Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.
12. When connecting the refrigerant piping, make sure the service valves of the Outside Unit is completely
closed (the factory setting) and do not operate it until the refrigerant piping for the Outside and Indoor
Units has been connected, a refrigerant leakage test has been performed and the evacuation process
has been completed.
13. Always use a non-oxidizing brazing material for brazing the parts and do not use flux. If not, oxidized film
can cause clogging or damage to the compressor unit and flux can harm the copper piping or refrigerant
oil.
14. Take care so that there is no thermal damage on the service valves of the outside unit.
(Especially packing part of service port.) Wrap the service valve with a wet towel when brazing it.
3
2
1
45
6
1 Refrigerant piping 4 Taping
2 Pipe to be brazed 5 Valve
3 Nitrogen 6 Pressure-reducing valve
Refrigerant piping system
ENGLISH
Installation Manual 31
Refrigerant piping on three principles
- Pipe must be able to obtain the specified thickness and should be used
with low impurities.
- Also when handling storage, pipe must be careful to prevent a fracture,
deformity and wound.
Should not be mixed with contaminations such as dust, moisture.
Drying Cleanliness Airtight
Should be no moisture inside
No dust inside.
There is no refrigerant leakage
Items
moisture
Dust
Leakage
Cause
failure
• Significant hydrolysis of refriger-
ant oil
• Degradation of refrigerant oil
• Poor insulation of the compres-
sor
• Do not cold and warm
• Clogging of EEV, Capillary
• Degradation of refrigerant oil
• Poor insulation of the compres-
sor
• Do not cold and warm
• Clogging of EEV, Capillary
• Gas shortages
• Degradation of refrigerant oil
• Poor insulation of the compres-
sor
• Do not cold and warm
Countermea
sure
• No moisture in the pipe
• Until the connection is complet-
ed, the plumbing pipe entrance
should be strictly controlled.
• Stop plumbing at rainy day.
• Pipe entrance should be taken
side or bottom.
• When removal burr after cutting
pipe, pipe entrance should be
taken down.
• Pipe entrance should be fitted
cap when pass through the
walls.
• No dust in the pipe.
• Until the connection is complet-
ed, the plumbing pipe entrance
should be strictly controlled.
• Pipe entrance should be taken
side or bottom.
• When removal burr after cutting
pipe, pipe entrance should be
taken down.
• Pipe entrance should be fitted
cap when pass through the
walls.
• Airtightness test should be.
• Brazing operations to comply
with standards.
• Flare to comply with standards.
• Flange connections to comply
with standards.
Refrigerant piping system
32 Outside Unit
How to work
Regulator
Nitrogen gas
Pressure 0.02MPa less
Auxiliary valve
Taping
(Should not
contain air)
Welding Point
Note) should not block the outlet side.
When the internal pressure in pipe is abo
ve the atmospheric pressure, pinhole is o
ccurred and it is a leakage cause.
Oxide scale
Nitrogen
Welding, as when heating without nitrogen substitution a large amount of the oxide film is formed on the inter-
nal piping.
The oxide film is a caused by clogging EEV, Capillary, oil hole of accumulator and suction hole of oil pump in
compressor.
It prevents normal operation of the compressor.
In order to avoid this problem, Welding should be done after replacing air by nitrogen gas.
When welding plumbing pipe, the work is required.
Nitrogen substitution method
CAUTION
1. Always use the nitrogen.(not use oxygen, carbon dioxide, and a Chevron gas):
Please use the following nitrogen pressure 0.02MPa
Oxygen --------- Promotes oxidative degradation of refrigerant oil. Because it is flammable, it is
strictly prohibited to use
Carbon dioxide --- Degrade the drying characteristics of gas
Chevron Gas ---- Toxic gas occurs when exposed to direct flame.
2. Always use a pressure reducing valve.
3. Please do not use commercially available antioxidant.
The residual material seems to be the oxide scale is observed.
In fact, due to the organic acids generated by oxidation of the alcohol contained in the anti-oxi-
dants, ants nest corrosion occurs. (causes of organic acid alcohol + copper + water + temperature).
Refrigerant piping system
ENGLISH
Installation Manual 33
Outside unit
Gas pipe
Main pipe
Liquid pipe
Branching
pipe
Branching
pipe
Indoor unit
7.5 Selection of refrigerant piping
Selection of pipe sizeName
Size of main pipe
Pipe size of between branching sections
Connecting pipe size of indoor unit
Piping partsNo.
Outside unit
↓
1st branching section
Branching section
↓
Branching section
Branching section
↓
Indoor unit
Main pipe
①
②
③
Branching pipe
Indoor unit
connecting pipe
Outside unit capacity
Liquid pipe Gas pipe
[mm (inch)] [mm (inch)]
4HP Ø9.52 (3/8) Ø19.05 (3/4)
5HP Ø9.52 (3/8) Ø19.05 (3/4)
6HP Ø9.52 (3/8) Ø19.05 (3/4)
Indoor unit capacity[kW (Btu/h)]
Liquid pipe Gas pipe
[mm (inch)] [mm (inch)]
≤ 5.6 (19,100) Ø6.35 (1/4) Ø12.7 (1/2)
< 16.0 (54,600) Ø9.52 (3/8) Ø15.88 (5/8)
Indoor unit capacity[kW (Btu/h)]
Liquid pipe Gas pipe
[mm (inch)] [mm (inch)]
≤ 5.6 (19,100) Ø6.35 (1/4) Ø12.7 (1/2)
< 16.0 (54,600) Ø9.52 (3/8) Ø15.88 (5/8)
< 22.4 (76,400) Ø9.52 (3/8) Ø19.05 (3/4)
Refrigerant piping system
34 Outside Unit
Branch pipe Fitting
Y branch
A
B
To Outside Unit
To Branch Piping or Indoor Unit
A
B
Facing
upwards
Facing
downwards
Within ±3° Within ±3°
Viewed from point A
in direction of arrow
Horizontal
plane
Within +/- 10°
A
Insulator
(included with kit)
Liquid and gas
pipe joints
Insulator for
field piping
Tape
(field supply)
Header
To outside unit
To indoor unit
A
B
A
B
C
• Ensure that the branch pipes are attached horizontally or vertically (see the diagram below.)
• There is no limitation on the joint mounting configuration.
• If the diameter of the refrigerant piping selected by the procedures described is different from the size
of the joint, the connecting section should be cut with a pipe cutter.
• Branch pipe should be insulated with the insulator in each kit.
• When the number of pipes to be connected is
smaller than the number of header branches,
install a cap to the unconnected branches.
• The indoor unit having larger capacity must be
installed closer to Ⓐ than smaller one.
• If the diameter of the refrigerant piping selected
by the procedures described is different from
the size of the joint,
the connecting section
should be cut with a pipe cutter.
ⓒ Pipe cutter
Refrigerant piping system
ENGLISH
Installation Manual 35
• When the number of indoor units to be connected to the branch pipes is less than the number of branch
pipes available for connection then cap pipes should be fitted to the surplus branches.
• Fit branch pipe lie in a horizontal plane.
• Header should be insulated with the insulator in each kit.
• Joints between branch and pipe should be sealed with the tape included in each kit.
• Any cap pipe should be insulated using the insulator provided with each kit and then taped as described
above.
B%
Pinched pipe
Horizontal plane
View from point B in the direction of the arrow
Insulate the header using"
the insulation"
material attached to the"
branch pipe kit"
as shown in the figure.
Insulator
Insulator of field pipe
Tape
Tape
Cap pipe
Insulator for cap pipe
Refrigerant piping system
36 Outside Unit
Thermal insulation of refrigerant piping
Heat
insulation
material
Outer
covering
Adhesive + Heat - resistant polyethylene foam +
Adhesive tape
Indoor Vinyl tape
Floor exposed
Water-proof hemp cloth + Bronze asphalt
Outside
Water-proof hemp cloth + Zinc plate + Oily paint
Note:
When using polyethylene cover as covering material, asphalt roof-
ing shall not be required.
• Do not insulate gas or low pressure pipe and liquid or high
pressure pipe together.
• Be sure to fully insulate connecting portion.
Liquid pipe
Gas pipe
Power lines
Finishing tape
Insulating material
Bad example
Good example
These parts are not insulated.
B A C
A
B
C
A
C
D
E
A
B
C
D
E
Transmission lines
F
Liquid pipe
Transmission lines
Transmission lines
Separation
Gas pipe
Power lines
Insulating material
A
B
C
D
E
A
A
B
F
Heat insulation material
Pipe
Outer covering
(Wind the connection part and cutting part of
heat insulation material with a finishing tape.)
Power lines
E
D
D
B
A
C
Be sure to give insulation work to refrigerant piping by covering liquid pipe and gas pipe separately with
enough thickness heat-resistant polyethylene, so that no gap is observed in the joint between indoor unit
and insulating material, and insulating materials themselves. When insulation work is insufficient, there is a
possibility of condensation drip, etc. Pay special attention to insulation work to ceiling plenum.
1m1m
A
B
D
F
F
G
B
G
D
B
H
I
J
A
E
B
I
A
B
D
C
Inner wall (concealed)
Floor (fireproofing)
Penetrating portion on fire
limit and boundary wall
Roof pipe shaft
Outer wall Outer wall (exposed)
Penetrations
Sleeve
Heat insulating material
Lagging
Caulking material
Band
Waterproofing layer
Sleeve with edge
Lagging material
Mortar or other incombustible caulking
Incombustible heat insulation material
When filling a gap with mortar, cover the
penetration part with steel plate so that
the insulation material will not be caved in.
For this part, use incombustible materials
for both insulation and covering.(Vinyl
covering should not be used.)
Y branch pipe and header branch pipe type
ENGLISH
Installation Manual 37
Y branch pipe and header branch pipe type
Y branch pipe
Models Gas pipe Liquid pipe
[unit:mm (inch)
ARBLN03321
ARBLN07121
ARBLN14521
ARBLN01621
413 (16-1/4)
390 (15-11/32)
I.D19.05 (3/4)
I.D19.05 (3/4)
I.D19.05 (3/4)
I.D19.05 (3/4)
O.D15.88 (5/8)
I.D12.7 (1/2)
I.D15.88 (5/8)
I.D15.88 (5/8)
I.D15.88 (5/8)
I.D12.7 (1/2)
I.D12.7 (1/2)
I.D12.7 (1/2)
I.D12.7
(1/2)
I.D12.7
(1/2)
I.D12.7 (1/2)
I.D12.7 (1/2)
292 (11-1/2)
281 (11-1/16)
292 (11-1/2)
281 (11-1/16)
74
(2-29/32)
74
(2-29/32)
70 (2-3/4)
70 (2-3/4)
70 (2-3/4)
70 (2-3/4)
I.D15.88 (5/8)
I.D15.88 (5/8)
I.D25.4 (1)
I.D25.4 (1)
O.D25.4 (1)
80 (3-5/32)
110 (4-11/32)
471 (18-17/32)
517 (20-11/32)
125
(4-29/32)
83
(3-9/32)
130 (5-1/8)
I.D15.88 (5/8)
I.D41.3 (1-5/8)
I.D41.3
(1-5/8)
I.D41.3 (1-5/8)
I.D38.1 (1-1/2)
I.D38.1 (1-1/2)
I.D38.1 (1-1/2)
O.D38.1 (1-1/2)
O.D15.88 (5/8)
2
2
3
3
2
2
3
3
3
3
376 (14-13/16)
404 (15-29/32)
)23/32-4 (021)23/32-4 (021
120 (4-23/32)
120 (4-23/32)
90 (3-17/32)
90 (3-17/32)
I.D15.88 (5/8)
I.D15.88 (5/8)
2
3
2
31
I.D19.05 (3/4)
I.D19.05 (3/4)
I.D19.05 (3/4)
I.D19.05 (3/4)
O.D19.05 (3/4)
O.D19.05 (3/4)
O.D19.05 (3/4)
12
96
(3-25/32)
I.D22.2 (7/8)
I.D22.2 (7/8)
I.D22.2 (7/8)
I.D22.2 (7/8)
I.D22.2 (7/8)
O.D22.2 (7/8)
O.D22.2 (7/8)
I.D22.2 (7/8)
I.D22.2 (7/8)
I.D6.35 (1/4)
I.D6.35 (1/4)
I.D6.35 (1/4)
1
1
I.D34.9 (1-3/8)
I.D34.9 (1-3/8)
I.D34.9 (1-3/8)
I.D34.9 (1-3/8)
O.D34.9 (1-3/8)
I.D28.58 (1-1/8)
I.D28.58 (1-1/8)
I.D28.58 (1-1/8)
I.D28.58 (1-1/8)
I.D28.58 (1-1/8)
O.D28.58 (1-1/8)
I.D28.58 (1-1/8)
O.D31.8 (1-1/4)
I.D31.8 (1-1/4)
I.D31.8 (1-1/4)
I.D9.52 (3/8)
I.D9.52 (3/8)
I.D9.52 (3/8)
O.D9.52 (3/8)
1
I.D12.7 (1/2)
I.D12.7 (1/2)
I.D12.7 (1/2)
74
(2-29/32)
332 (13-1/16)
321 (12-5/8)
I.D6.35 (1/4)
I.D6.35 (1/4)
I.D9.52 (3/8)
I.D9.52 (3/8)
I.D9.52 (3/8)
I.D15.88 (5/8)
I.D15.88 (5/8)
I.D15.88 (5/8)
I.D12.7 (1/2)
I.D12.7 (1/2)
I.D12.7 (1/2)
O.D12.7 (1/2)
O.D12.7 (1/2)
70 (2-3/4)
110 (4-11/32)
371 (14-19/32)
394 (15-1/2)
83
(3-9/32)
2
3
3
I.D19.05 (3/4)
I.D19.05 (3/4)
I.D19.05 (3/4)
2
I.D6.35 (1/4)
I.D9.52 (3/8)
I.D9.52 (3/8)
I.D12.7 (1/2)
O.D12.7 (1/2)
I.D12.7
(1/2)
110 (4-11/32)110 (4-11/32)
416 (16-3/8)
444 (17-15/32)
O.D15.88 (5/8)
I.D15.88 (5/8)
I.D19.05 (3/4)
I.D15.88 (5/8)
I.D15.88 (5/8)
I.D19.05 (3/4)
I.D19.05 (3/4)
O.D19.05 (3/4)
80 (3-5/32)
2
3
1
2 33
96
(3-25/32)
I.D22.2 (7/8)
I.D22.2 (7/8)
I.D22.2 (7/8)
I.D6.35 (1/4)
I.D9.52 (3/8)
I.D9.52 (3/8)
Y branch pipe and header branch pipe type
38 Outside Unit
Header
[unit:mm (inch)]
Models Gas pipe Liquid pipe
4 branch
ARBL054
7 branch
ARBL057
4 branch
ARBL104
7 branch
ARBL107
10 branch
ARBL1010
10 branch
ARBL2010
360 (14-5/32)
540 (21-1/4)
540 (21-1/4)
120 (4-23/32)
ID15.88 (5/8)
ID12.7 (1/2)
ID12.7 (1/2)
ID15.88 (5/8)
ID15.88 (5/8)
ID19.05 (3/4)
120 (4-23/32)
360 (14-5/32)
ID9.52 (3/8)
ID9.52 (3/8)
ID6.35 (1/4)
ID6.35 (1/4)
ID9.52 (3/8)
ID12.7 (1/2)
150
(5-29/32)
150
(5-29/32)
150
(5-29/32)
150
(5-29/32)
150
(5-29/32)
400 (15-23/32)
160 (6-5/16)
ID15.88 (5/8)ID15.88 (5/8)
ID12.7 (1/2)ID12.7 (1/2)
ID15.88 (5/8)
ID12.7 (1/2)
ID19.05 (3/4)
ID15.88 (5/8)
ID22.2 (7/8)
ID28.58 (1-1/8)
ID25.4 (1)
120
(4-23/32)
120
(4-23/32)
120
(4-23/32)
120
(4-23/32)
120
(4-23/32)
120
(4-23/32)
120
(4-23/32)
120
(4-23/32)
120
(4-23/32)
120 (4-23/32)
ID15.88 (5/8)
ID12.7 (1/2)
ID15.88 (5/8)
ID12.7 (1/2)
ID15.88 (5/8)
ID19.05 (3/4)
120 (4-23/32)
ID6.35 (1/4)
ID9.52 (3/8)
ID9.52 (3/8)
ID12.7 (1/2)
160 (6-5/16)
580 (22-27/32)
ID19.05 (3/4)
ID15.88 (5/8)
ID15.88 (5/8)ID15.88 (5/8)
ID12.7 (1/2)ID12.7 (1/2)
ID15.88 (5/8)
ID12.7 (1/2)
ID22.2 (7/8)
ID28.58 (1-1/8)
ID25.4 (1)
700 (27-9/16)
120 (4-23/32)
ID6.35 (1/4)
ID9.52 (3/8)
ID9.52 (3/8)ID9.52 (3/8)
ID6.35 (1/4)ID6.35 (1/4)
ID9.52 (3/8)
ID6.35 (1/4)
ID9.52 (3/8)ID12.7 (1/2)
ID15.88 (5/8)
ID12.7 (1/2)
120 (4-23/32)
720 (28-11/32)
ID6.35 (1/4)
ID9.52 (3/8)
ID9.52 (3/8)
ID6.35 (1/4)
ID12.7 (1/2)
ID9.52 (3/8)
107 (4-7/32)
60*9=540 (21-1/2)
700 (27-9/16)
ID6.35 (1/4)
ID9.52 (3/8)
ID19.05 (3/4)
ID15.88 (5/8)
ID9.52 (3/8)
ID6.35 (1/4)
ID9.52 (3/8)
ID6.35 (1/4)
120
(4-23/32)
120
(4-23/32)
160 (6-5/16)
760 (29-28/32)
ID19.05 (3/4)
ID15.88 (5/8)
ID22.2 (7/8)
ID28.58 (1-1/8)
ID25.4 (1)
182 (7-5/32)
775 (30-17/32)
ID19.05 (3/4)
ID15.88 (5/8)
ID15.88 (5/8)
ID12.7 (1/2)
ID28.58 (1-1/8)
ID31.8 (1-1/4)
ID34.9 (1-3/8)
150
(5-29/32)
150
(5-29/32)
150
(5-29/32)
150
(5-29/32)
150
(5-29/32)
150
(5-29/32)
150
(5-29/32)
120 (4-23/32)
120
(4-23/32)
360 (14-5/32)
ID9.52
(3/8)
ID9.52 (3/8)
ID6.35 (1/4)
ID6.35
(1/4)
ID9.52 (3/8)
ID12.7 (1/2)
Leakage test and vacuum
ENGLISH
Installation Manual 39
Leakage test and vacuum
Leak test
Indoor unit
Outside unit
Liquid side
Gas side
Liquide pipe
Gas pipe
Close
Close
Nitrogen gas
cylinder
Leak test should be m
ade by pressurizing nitrogen gas to 3.8MPa (38.7kgf/cm
2
). If the pressure does not drop for 24
hours, the system passes the test. If the pressure drops, check where the nitrogen leaks. For the test method, refer to
the following figure. (Make a test with the service valves closed. Be also sure to pressurize liquid pipe, gas pipe and
high/low pressure common pipe). The test result can be judged good if the pressure has not be reduced after leaving
for about one day after completion of nitrogen gas pressurization.
Note:
If the ambient temperature differs between the time when pressure is applied and when the pressure drop is
checked, apply the following correction factor
There is a pressure change of approximately 0.1kg/cm
2
(0.01MPa) for each 1°C of temperature difference.
Correction= (Temp. at the time of pressurization – Temp. at the time of check) X 0.1
For example: Temperature at the time of pressurization (3.8MPa) is 27°C
24hour later: 3.73MPa, 20°C
In this case the pressure drop of 0.07 is because of temperature drop
And hence there is no leakage in pipe occurred.
To prevent the nitrogen from entering the refrigeration system in the liquid state, the top of the
cylinder must be at higher position than the bottom when you pressurize the system.
Usually the cylinder is used in a vertical standing position.
Leakage test and vacuum
40 Outside Unit
Vacuum
Vacuum drying should be made from the service port provided on the outside unit’s service valve to the vacuum
pump commonly used for liquid pipe, gas pipe and high/low pressure common pipe. (Make Vacuum from liquid
pipe, gas pipe and high/low pressure common pipe with the service valve closed.)
* Never perform air purging using refrigerant.
• Vacuum drying: Use a vacuum pump that can evacuate to -100.7kPa (5Torr, -755mmHg).
1. Evacuate the system from the liquid and gas pipes with a vacuum pump for over 2hrs and bring the system to
-100.7kPa.
After maintaining system under that condition for over 1hr, confirm the vacuum gauge rises. The system may
contain moisture or leak.
2. Following should be executed if there is a possibility of moisture remaining inside the pipe.
(Rainwater may enter the pipe during work in the rainy season or over a long period of time)
After evacuating the system for 2hrs, give pressure to the system to 0.05MPa(vacuum break) with nitrogen
gas and then evacuate it again with the vacuum pump for 1hr to -100.7kPa(vacuum drying). If the system
cannot be evacuated to -100.7kPa within 2hrs, repeat the steps of vacuum break and its drying.
Finally, check if the vacuum gauge does not rise or not, after maintaining the system in vacuum for 1 hr.
Scale
Use a graviometer. (One that can measure
down to 0.1kg). If you are unable to prepare
such a high-precision gravimeter you may
use a charge cylinder.
Vacuum pump
Indoor unit
Outside unit
Liquid side
Gas side
Close
Liquide pipe
Gas pipe
Close
Note : Always add an appropriate amount of refrigerant. (For the refrigerant additional charge)
Too much or too little refrigerant will cause trouble.
To use the Vacuum Mode
(If the Vacuum mode is set, all valves of Indoor units and Outside units will be opened.)
When installing and moving the air conditioner to another site, recharge after perfect evacuation.
- If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction and
the unit may be damaged.
Electrical Wiring
ENGLISH
Installation Manual 41
Electrical Wiring
1. Follow ordinance of your governmental organization for technical standard related to electrical equipment,
wiring regulations and guidance of each electric power company.
2. Install the Outside Unit transmission line away from the power source wiring so that it is not affected by elec-
tric noise from the power source. (Do not run it through the same conduit.)
3. Be sure to provide designated grounding work to Outside Unit.
4. Give some allowance to wiring for electrical part box of Indoor and Outside Units, because the box is some-
times removed at the time of service work.
5. Never connect the main power source to terminal block of transmission line. If connected, electrical parts will
be burnt out.
6. Use 2-core shield cable for transmission line.(O mark in the figure below) If transmission lines of different sys-
tems are wired with the same multiplecore cable, the resultant poor transmitting and receiving will cause erro-
neous operations. ( mark in the figure below)
7. Only the transmission line specified should be connected to the terminal block for Outside Unit transmission.
Be sure to have authorized electrical engineers do the electric work using special circuits in
accordance with regulations and this installation manual. If power supply circuit has a lack of
capacity or electric work deficiency, it may cause an electric shock or fire.
Be sure to correct the outside unit to earth. Do not connect earth line to any gas pipe, water pipe,
lightening rod or telephone earth line. If earth is incomplete, it may cause an electric shock.
Remote
control
Remote
control
Remote
control
Remote
control
Indoor
Unit
Outside Unit Outside Unit
Outside Unit
Indoor
Unit
Remote
control
Remote
control
Indoor
Unit
Indoor
Unit
Remote
control
Remote
control
Indoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
Electrical Wiring
42 Outside Unit
When none are available, follow the instructions below.
• Do not connect wiring of different thicknesses to the power terminal block. (Slack in the power wiring
may cause abnormal heat.)
• When connecting wiring which is the same thickness, do as shown in the figure below.
• For wiring, use the designated power wire and connect firmly, then secure to prevent outside pressure
being exerted on the terminal block.
• Use an appropriate screwdriver for tightening the terminal screws. A screwdriver with a small head will
strip the head and make proper tightening impossible.
• Over-tightening the terminal screws may break them.
u Precautions when laying power and ground wiring
Round pressure terminal Power wire (Ground wire)
Use round pressure terminals for connections to the power terminal block.
When laying ground wiring, you must use round pressure terminals.
CAUTION
• This product have reversed phase protection detector that only works when the power is turned on.
If there exists black out or the power goes on and off which the product is operating, attach a
reversed phase protection circuit locally. running the product in reversed phase may break the com-
pressor and other parts.
• Use the 2-core shield cables for communication lines. Never use them together with power cables.
• The conductive shielding layer of cable should be grounded to the metal part of both units.
• Never use multi-core cable
• As this unit is equipped with an inverter, to install a phase leading capacitor not only will deteriorate
power factor improvement effect, but also may cause capacitor abnormal heating. Therefore, never
install a phase leading capacitor.
• Make sure that the power unbalance ratio is not greater than 2%. If it is greater, the unit's lifespan
will be reduced.
• Introducing with a missing N-phase or with a mistaken N-phase will break the equipment.
Electrical Wiring
ENGLISH
Installation Manual 43
- Unscrew all the screw, pull out the panel.
- Connect the transmission wire between outside unit and indoor unit,
the connection between outside unit and central controller system
pass through the sub PCB for central control.
- When connecting indoor unit with the shield cable, ground at the
grounding screw.
When connecting central controller with the shield cable, ground at
the grounding screw.
- Refer to next page about the distance between main power cable
and communication cable.
Front Panel
Control Box and Wiring Location
Electrical Wiring
44 Outside Unit
Transmission and Power Lines
1) Transmission cable
• Types : shielding wire
• Diameter : over 1.25mm
2
• Maximum allowable temperature: 60°C (140°F)
• Maximum allowable line length: under 300m (984ft)
2) Remote control cable
• Types : 3-core cable
3) Simple central control cable
• Types : 4-core cable (Shielding wire)
• Use wires of size : 1.0~1.5mm
2
• Insulation material : PVC
4) Separation of transmission and power lines
• If transmission and power lines are run alongside each other then there is a strong likelihood of operational
faults developing due to interference in the signal wiring caused by electrostatic and electromagnetic cou-
pling.
The tables below indicates our recommendation as to appropriate spacing of transmission and power lines
where these are to be run side by side
Note:
1. The figures are based on assumed length of parallel cabling up to 100m. For length in excess of 100m
the figures will have to be recalculated in direct proportion to the additional length of line involved.
2. If the power supply waveform continues to exhibit some distortion the recommended spacing in the
table should be increased.
• If the lines are laid inside conduits then the following point must also be taken into account when grouping
various lines together for introduction into the conduits
• Power lines(including power supply to air conditioner) and signal lines must not be laid inside the same
• In the same way, when grouping the lines power and signal lines should not be bunched together.
Current capacity of power line Spacing
10A 300mm (11-13/16inch)
50A 500mm (19-11/16inch)
100A 1,000mm (39-3/8inch)
Exceed 100A 1,500mm (59-1/16inch)
100V or more
If apparatus is not properly earthed then there is always a risk of electric shocks, the earthing of the
apparatus must be carried out by a qualified person.
Electrical Wiring
ENGLISH
Installation Manual 45
1. Use a separate power supply for the Outside Unit and Indoor Unit.
2. Bear in mind ambient conditions (ambient temperature,direct sunlight, rain water,etc.) when proceed-
ing with the wiring and connections.
3. The wire size is the minimum value for metal conduit wiring. The power cord size should be 1 rank
thicker taking into account the line voltage drops. Make sure the power-supply voltage does not drop
more than 10%.
4. Specific wiring requirements should adhere to the wiring regulations of the region.
5. Power supply cords of parts of appliances for outside use should not be lighter than polychloroprene
sheathed flexible cord.
6. Do not install an individual switch or electrical outlet to disconnect each of indoor unit separately from
the power supply.
u Wiring of Main Power Supply and Equipment Capacity
• Follow ordinance of your governmental organization for technical standard related to electrical equipment, wiring reg-
ulations and guidance of each electric power company.
• Make sure to use specified wires for connections so that no external force is imparted to terminal connections. If con-
nections are not fixed firmly, it may cause heating or fire.
• Make sure to use the appropriate type of overcurrent protection switch. Note that generated overcurrent may include
some amount of direct current.
• Some installation site may require attachment of an earth leakage breaker. If no earth leakage breaker is installed, it may
cause an electric shock.
• Do not use anything other than breaker and fuse with correct capacity. Using fuse and wire or copper wire with too large
capacity may cause a malfunction of unit or fire.
Electrical Wiring
46 Outside Unit
34 34 34
The GND terminal is a '–' terminal for the central controller, not Ground Line
Between Indoor and Outside unit
IDUSODU DRY1 DRY2 GND
INTERNET
BABA
12V
Outside unit
Single Phase of
Power supply
60Hz 208/230V
Power supply
1 Phase 60Hz
208/230V
Transmission line (3 line): Wired remote control
Single Phase of power supply line
Transmission line (2 shield line): Between Indoor Unit and Outside Unit
Power supply switch
(Switch fuse : ELCB)
Power supply switch
(Switch)
(Main Switch)
Pull Box(Installer option)
u Example Connection of Transmission Cable
WARNING
• Indoor Unit ground Lines are required for preventing electrical shock accident during current leakage,
Transmission disorder by noise effect and motor current leakage (without connection to pipe).
• Don't install an individual switch or electrical outlet to disconnect each of indoor unit separately from
the power supply.
• Install the main switch that can interrupt all the power sources in an integrated manner because this
system consists of the equipment utilizing the multiple power sources.
• If there exists the possibility of reversed phase, lose phase, momentary blackout or the power goes on
and off while the product is operating, attach a reversed phase protection circuit locally.
Running the product in reversed phase may break the compressor and other parts.
For Mexico:
Model ARWN~~~GA2: Nominal voltage: 220 V~ 60 Hz
Electrical Wiring
ENGLISH
Installation Manual 47
u Example Connection of Communication Cable
[BUS type]
• Connection of communication cable must be installed like below figure between indoor unit to outside unit.
[STAR type]
• Abnormal operation can be caused by communication defect, when connection of communication cable is installed like
below figure(STAR type).
External wiring
External wires should be connected as follows.
① Main power cable
② Communication cable
ڸ
ڹ
Electrical Wiring
48 Outside Unit
Connection method of the connecting cable (Example)
1. Make a hole appropriate for the passage of connection cable through on cap by tool.
2. After knocking out the holes, we recommend you paint the edges and areas around the edges using
the repair paint to prevent rusting
3. Pass the connecting cable through the hole.
4. Properly connect the cable on the terminal block.
5. Fix the connection cable with the cord clamp providing on the unit not to have strain at the terminal.
6. Finally, Fix the cap to the conduit panel.
WARNING
• Loose wiring may cause the terminal to overheat or result in unit malfunction.
• A fire hazard may also exist.
• Therefore, be sure all wiring is tightly connected.
Conduit
Model name ARWN038GA2 ARWN048GA2 ARWN053GA2
AWG 10 10 10
Conduit [mm (inch)] 12.7 (1/2) 12.7 (1/2) 12.7 (1/2)
Knockout Diameter [mm (inch)] 22.2 (7/8) 22.2 (7/8) 22.2 (7/8)
Electrical Wiring
ENGLISH
Installation Manual 49
Dip switch setting
1. Location of setting switch
2. Dip switch setting
1) Set the dip switch and turn on the power of the outside unit to check whether the set value is correctly
entered in the 7 segment.
2) This function is shown for only 2seconds after the power is connected.
n Check outside unit setting
• The number on the 7 segment is displayed in order after the power is connected.
• This number represents the setting condition.
If the applicable dip switch is not set correctly,
the product may not operate properly.
SW01B
SW02B
7 segment
SW01B
1234567
ON
SW02B
1234567
ON
Order Number Item
1 - Model code
2 - Total capacity(HP)
3 2 Heat pump model
4 25 Normal mode display (If the dip switch is set incorrectly, it is not displayed.)
5 136 Model Type (Water Mini)
n
Model Code
Model Code Unit(HP) Powersupply Ref.
120 4
121 5 1Ø, 208/230V R410A
122 6
For Mexico:
Model ARWN~~~GA2: Nominal voltage: 220 V~ 60 Hz
Electrical Wiring
50 Outside Unit
SW01B Setting SW02B Setting Remark
Normal mode at shipping
factory
1234567
ON
1234567
ON
Function SW01B Setting SW02B Setting Remark
Standard mode at shipping
factory
Standard
1234567
ON
1234567
ON
Electrical Wiring
ENGLISH
Installation Manual 51
Function SW01B Setting SW02B Setting Remark
Forced Oil Return
1234567
ON
1234567
ON
For water pipe Solenoid
Valve 208/230V power
Use this mode when tem-
perature of circulation inlet
water is under 10°C (50°F)
(You should use an anti
freeze)
You should install the vari-
able water flow valve con-
trol kit before using this
mode.
Vacuum Mode
Water Pipe
Solenoid Valve
208/230V
Functions
Ground source
mode
Variable water
Flow Control
Mode
1234567
ON
1234567
ON
1234567
ON
1234567
ON
1234567
ON
1234567
ON
1234567
ON
1234567
ON
Dry contact
Mode
1234567
ON
1234567
ON
n After operating the dip switch to set the additional function, you must reset the power of the main PCB to
reflect the changed function. (After recovering the dip switch to cancel the additional function, you must
reset the power of the main PCB to reflect the change.)
n If the dip switch is not set accurately, it can have excessive load on the product operation.
Set the dip switch properly.
For Mexico:
Model ARWN~~~GA2: Nominal voltage: 220 V~ 60 Hz
Electrical Wiring
52 Outside Unit
• The address of indoor units would be set by auto addressing
1) Wait for 3minutes after applying power supply.
2) Press the switch of the outside unit (SW02V) for 5seconds.
3) A "88" is indicated on 7-segment LED of the outside unit
PCB.
4) For completing addressing, 2~7minutes are required
depending on numbers of indoor unit connection set.
5) Numbers of indoor unit connection set whose addressing is
completed are indicated for 30seconds on 7-segment LED
of the outside unit PCB.
6) After completing addressing, address of each indoor unit is
indicated on the wired remote control display window.
(CH01, CH02, CH03, ............. CH06: Indicated as numbers
of indoor unit connection set.)
Indoor unit auto addressing
CAUTION
- In replacement of the indoor unit PCB, always perform auto address setting again.
If power supply is not applied to the indoor unit, operation error occurs.
Auto addressing is only possible on the main PCB
Auto addressing has to be performed after 3minutes to improve communication.
u The Procedure of Automatic Addressing
• Auto addressing setting end
Numbers of indoor unit connection set whose
addressing is completed are indicated for 30seconds
on 7-segment LED after completing setting
Indoor address number is displayed on wired remote control or
indoor unit display window. It is not an error message, will
disappeared when on/off button is pressed on remote control
ex) Display of 01, 02, ..., 15 means connection of 15 indoor
units and auto addressing is completed normally.
Auto addressing start
Waiting 3minutes
Power On
Press SW02V for 5sec.
7-segment LED = 88
Don't Press SW02V
Waiting about 2~7minutes
7-segment LED
OK
YES
NO Check the connections
of transmission line
= 88
Electrical Wiring
ENGLISH
Installation Manual 53
Group Number setting
Group Number setting for Indoor Units
① Confirm the power of whole system(Indoor Unit, Outside Unit) is OFF, otherwise turn off.
② The transmission lines connected to INTERNET terminal should be connected to central control of Outside
unti with care for their polarity( A ’ A, B ’ B )
③ Turn the whole system on.
④ Set the group and Indoor Unit number with a wired remote control.
⑤ To control several sets of Indoor Units into a group, set the group ID from 0 to F for this purpose.
Terminal block on the main PCB
SODU IDU INTERNET DRY1 DRY2
B
A
B(D) A(C)
GND 12V
B
A
BA
Group recognizing the simple central controller
No.0 group (00~0F)
No.1 group (10~1F)
No.2 group (20~2F)
No.3 group (30~3F)
No.4 group (40~4F)
No.5 group (50~5F)
No.6 group (60~6F)
No.7 group (70~7F)
No.8 group (80~8F)
No.9 group (90~9F)
No. A group (A0~AF)
No. B group (B0~BF)
No. C group (C0~CF)
No. D group (D0~DF)
No. E group (E0~EF)
No. F group (F0~FF)
Outside Units
Electrical Wiring
54 Outside Unit
Cool and Heat Selector Installation and Connection
• Connect wires as below figure at the hole of backside of Outside Unit Dry Contact.
• Insert the wire in the connection hole pushing the "Push" button.
• Setting Main PCB Dip SW of Master Outside Unit.
Without Cool/Heat Selector Installation and Connection
In case, try to set mode without Cool/Heat Selector and try to use other switch except from LG Outside
Cool/Heat Selector in field.
Connect signal terminal block as below figure and description.
- How to set mode without Cool/Heat Selector
• Cooling Mode Setting
¿ ‘ GND Connection
¡ ‘ Off (Open)
• Heating Mode Setting
¿ ‘ GND Connection
¡ ‘ GND Connection
• Fan/ All OFF Mode Setting
¿ ‘ Off (Open)
¡ ‘ GND Connection
Mode Change
Push Button
Heating
Outside Unit
: Developing
1. Fan / OFF
2.
OFF
Cooling
GND
GND
GND
Test Run
ENGLISH
Installation Manual 55
Test Run
Water supply system test run
• Before executing the test run for the product, you must first test the heat source water system.
The test run for the product must be executed after checking the flow rate and temperature of the heat source
water supplied.
Design the system including cooling tower, boiler, pump etc.
- Check the equipment capacity (Water volume, temperature control range).
Install the water pipe
Connect the water pipe to the inlet/outlet of the product so that the water
can be supplied to the product.
Execute water supply system test run
- The product does not operate but the pump and water supply equipment
will operate to flow the Heat source water to the heat exchanger on the
product side.
- Flow the water to all water piping system to clean any alien particles inside
the pipes and execute an air purge to remove an air within the pipes to
make the water supply smoother.
- Clean all the strainers of water pipe including around outside units.
Execute the test of water supply system without operating the product.
- Check whether outside unit inlet/outlet flow rate complies to the product
specification.
Standard Water volume is 80LPM based on 8HP and 150LPM based on
16HP.
- Check the water supply temperature. whether is OK
After checking the normal condition of the water supply, execute the test run
of the product.
To prevent the freezing of the heat exchanger when the refrigerant is dis-
charged with the water supply blocked, discharge the refrigerant after
draining out around the outside unit.
Equipment design
Water pipe system installation
Water supply system test run
Execute the product test run
Judging whether there is any
problem with the water supply
Water supply pipe and product
connection
Test Run
56 Outside Unit
How to Cope with Abnormal Test Run
Item
Phenomenon
Cause Checkpoint and resolution
Check whether the heat source water supply pump is operating.
Check whether the heat source water supply pipe is clogged.
(Clean strainer, valve locked, valve issue, air trapped etc.)
Check whether the flow switch is normal condition.
(Flow switch problem, arbitrary control, disconnection etc.)
Check whether heat source water supply pump is operating.
Check whether the heat source water supply pipe is clogged.
(Clean strainer, valve locked, valve issue, air trapped etc.)
Whether
heat water
is supplied
Heat water not supplied or flow
rate is insufficient (During air con-
ditioning)
CH32
When connecting the flow switch,
heat-sourced water doesn’t flow or
the amount of its flow lacks due to
the checked error related to heat-
sourced water.
CH24
Precaution before test run
1
2
3
4
5
Check whether the air is completely removed and the water supply is flowing smoothly.
Check whether there is any refrigerant leakage of any disconnected or loose communication or power wire, or use
the electric wiring diagram to check the wiring connection condition.
Check whether the power and communication wire are connected.
Check whether the power cable L1, L2 are correctly connected.
Check the insulation resistance with the DB mega tester device (DC 500V) between the power terminal block and
grounding, and check whether it is 2.0MΩ or above when measured.
If the resistance is 2.0MΩ or less, do not operate the product.
Precaution)
- Never check the insulation resistance for the terminal control board.
(The control board can be damaged.)
- If you leave the system turned off right after the installation or for a long period of time, the refrigerant gets accu-
mulated within the compressor and the insulation resistance reduces to less than 2MΩ. When the insulation
resistance is 2MΩ or less, turn on the power and let the electricity be supplied to the crank case heater of the
compressor and let the refrigerant including the oil inside the compressor to evaporate.
Then the insulation resistance value will increase to more than 2.0MΩ.
Check whether the liquid and gas pipes are open.
Precaution when blocking the water cooling type Multi V main power
- While using the product (Air conditioning season/Heating season), always connect the main power of the outside
unit.
- During the test run operation after installing the product or during the operation after blocking the outside unit
main power (Power outage etc.), you must always connect the power 6hours prior to heating the crank case
heater. If the crank case is not preheated for more than 6hours with the electric heater, it can cause a burn on
the compressor.
• Always check whether the water supply is flowing smoothly before the test run. (If sufficient amount
of water is not flowing, it can burn the product.)
• During the initial test run after installing the product, leaving the product for more than 3days or
after replacing the compressor, power must be connected 6hours prior to the operation to heat the
compressor heater. (If the product is not heated sufficiently, it can burn the product.)
Test Run
ENGLISH
Installation Manual 57
Maintenance of plate type heat exchanger
h When CH24 or CH180 error occurs during the test operation of the heater, the inside of the panel heat exchanger may be
partially frozen and therefore, be sure to get rid of its cause and then, re-operate the device.
(The root cause of partial freezing: The lack of flow of heat-sourced water, suspension of water, lack of cooling medium,
infiltration of foreign substance inside of panel heat exchanger )
As the scales are created in the panel heat exchanger, its efficiency may decrease or damage may occur due to winter-sowing due
to the decrease in its flow.
Due to this reason, regular maintenance is necessary so that the scales shouldn't be created.
1. Before the season of use, check below points.(Once a year)
1) inspection on water quality to check if this is within the standard condition.
2) Clean the strainer.
3) Check if the flow is appropriate.
4) Check if the operation environment is appropriate.(Pressure, flow, output temperature)
2. Below procedure should be abided by in order to clean the panel heat exchanger. (Once every 5years)
1) Check if the service port is equipped with the water pipe in order to clean the chemical solution.
5% diluted formic acid, citric acid, oxalic acid, acetate acid, phosphoric acid and etc. are appropriate for the chemical solution
for wiping out the scales.(Hydrochloric acid, sulphuric acid, nitric acid and etc. shouldn't be used due to its corrosion.)
2) Be sure to check if the gate valve of inflow/outflow pipe and the valve for outflow pipe are properly closed when cleaning.
3) Connect the water pipe for cleaning with the chemical solvent through the service plug of the pipe and fill up the panel heat
exchanger with 50°C~60°C (122°F~140°F) of cleaning solvent and circulate it with the pump for 2~5hours. The circulation
time may depend on the temperature of the cleaning solvent or the creation of the scales. Therefore, observe change in the
color of the chemical solvent to set the circulation time for removing the scales.
4) After the circulation of the solvent, extract the solvent inside of the panel heat exchanger and fill up 1~2% of NaOH or NaHCO
3
and then, circulate it for 15~20minutes to neutralize the heat exchanger.
5) Once the neutralization is completed, clean the inside of the panel heat exchanger with clean water.
Measure the water Ph to check if the chemical solvent is properly removed or not.
6) When using a different kind of chemical solvent in the market, be sure to check if there is any corrosive action to stainless or
copper in advance or not.
7) For details on the cleaning chemical solvent, be sure to consult the specialists of the related corporation.
3. After cleaning, operate the device to see if it works properly once again.
Gate valve(locked)
Service plug
Strainer
Outflow water"
valve(locked)
Gate valve(locked)
Water-cooling"
type multi V
Hose
Pump
[Cleaning the panel heat exchanger]
Screening net
Item
Phenomenon
Cause Checkpoint and resolution
Check whether heat source water supply pump is operating.
Check whether the heat source water supply pipe is clogged.
(Clean strainer, valve locked, valve issue, air trapped etc.)
Check whether heat source waterr supply pump is operating.
Check whether the heat source watersupply pipe is clogged.
(Clean strainer, valve locked, valve issue, air trapped etc.)
Whether
heat water
is supplied
Heat water not supplied or flow
rate is insufficient
Heat water not supplied or flow
rate is insufficient (During heat-
ing)
CH34
CH180
Test Run
58 Outside Unit
Daily check/management
Maintenance/Repair checklist
1. Water quality control
The plate type heat exchanger is not structured to be disassembled, cleaned or replaced with parts.
To prevent corrosion or scaling on the plate type heat exchanger, special care must be taken to control the water quality.
Water quality must satisfy the minimum criteria of the reference water quality items.
When anti-corrosion agent or corrosion inhibitor is added, the substance must not have any corrosive effect on stainless
steel and copper.
Even if the circulating water is not contaminated by the external air, it is recommended to empty the water flowing in the
pipe and to resupply the water.
2. Flow rate control
If the flow rate is insufficient, it can cause freezing on the plate type heat exchanger.
Check whether the strainer is clogged or whether the pipe is filled with air and then check the temperature and pressure
difference of the inlet and outlet pipe to check whether the flow rate is insufficient.
If the temperature and pressure difference is above the appropriate level, it means that the flow rate is reduced. In this
case, the operation must immediately be stopped and re-operated when the root cause is resolved. (*If air is trapped in
the pipe, the air must be purged. Air inside the water pipe interferes with the circulation of the heat water supply and can
cause insufficient flow rate or freezing.)
3. Brine density management
When using the brine (Anti-freeze) in the heat water supply, designated type and density must be used. Calcium chloride
brine can cause corrosion on the plate type heat exchanger and must not be used.
If the anti-freeze liquid is left as is, it absorbs the moisture from the air to cause a drop in the density, leading to freezing
of plate type heat exchanger. Therefore minimize the contact surface with the atmosphere and periodically measure the
density of the brine to supplement the brine as needed to maintain the density.
Product operating condition
Heat exchanger cleaning (Wash)
Strainer cleaning
Water quality check
Refrigerant leakage check
Indoor unit filter cleaning
Period (Year)
Checkpoint
• The above checklist is set based on the minimum period and more frequent checking can be required depending on the operating condition/water quality condition.
• When cleaning the heat exchanger, make sure to take parts out or lock the value so that chemical detergent does not penetrate into the pressure gauge etc.
• When cleaning the heat exchanger, check the connecting part of the water pipes prior to cleaning so that the chemical detergent does not leak.
• After sufficiently mixing the chemical detergent with water, start cleaning.
• Cleaning the heat exchanger is easier at the initial stage and becomes difficult after the scaling has accumulated.
• In areas where the water quality is poor, cleaning is required periodically.
Because chemical detergent has strong acidity, it must be washed off thoroughly with water.
• To check whether it is cleaned well inside, remove the hose and check the inside.
• Purge the air to remove any air inside the water pipe.
• After checking, always check whether the heat water supply is flowing normally flowing before operating the product.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
● ● ●
● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
● ●
● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
(
●
: Check mark)
Test Run
ENGLISH
Installation Manual 59
Self-Diagnosis Function
Error Indicator
• This function indicates types of failure in self-diagnosis and occurrence of failure for air condition.
• Error mark is displayed on display window of indoor units and wired remote controller, and 7-segment LEDof
outside unit control board as shown in the table.
• If more than two troubles occur simultaneously, lower number of error code is first displayed.
• After error occurrence, if error is released, error LED is also released simultaneously.
Display Error item Root cause of error
Indoor unit
0 1 - Indoor unit air temperature sensor error
Indoor unit air temperature sensor disconnection or short
circuit
0 2 -
Inlet pipe temperature sensor of indoor
unit
Indoor unit pipe inlet temperature sensor disconnection or
short circuit
0 3 -
Communication error between wired
remote controller and indoor unit
Occurs when indoor unit communication signal is not
received from the wired remote controller
0 4 - Indoor unit drain error Drain pump and float switch error
0 5 -
Communication error between outside
unit and indoor unit
When the indoor unit does not receive the outside com-
munication signal continuously for 5minutes or more
0 6 -
Indoor unit pipe outlet temperature sen-
sor error
Indoor unit pipe outlet temperature sensor disconnection
or short circuit
0 9 - Indoor unit EEPROM error
Communication error between MICOM and EEPROM or
when there is
no indoor unit EEPROM data
1 0 -
Indoor unit BLDC motor feedback signal
error
When motor connector is removed or defective
1 7 - Inlet Air temperature sensor of FAU Air temperature sensor of indoor unit is open or short
Outside unit
2 1 1
Outside unit inverter compressor IPM
fault
Outside unit inverter compressor drive IPM error
2 2 1
Inverter Board Input Over Current(RMS)
of Outside Unit
Outside Unit Inverter Board Input Current excess (RMS)
2 3 1
Outside unit inverter compressor DC link
under-voltage
DC voltage is not charged after master outside unit oper-
ating relay is turned on
2 4 1 Outside unit high pressure switch
Compressor maintenance by master outside unit high
pressure switch Flow rate insufficiency or flow switch
trouble of master outside unit
2
6 1
Outside unit inverter compressor opera-
tion failure error
Outside unit input voltage is 487V and above or less than
270V
Test Run
60 Outside Unit
Display Error item Root cause of error
Outside unit
2 8 1
Outside unit inverter DC link over-voltage
error
Compressor turned off due to master outside unit inverter
DC voltage over-charge
2 9 1
Outside unit inverter compressor over-
current
Outside unit inverter compressor error or operating com-
ponent (IPM) error operation
3 1 1
Outside unit inverter CT under-current
error
Compressor turned off due to master outside unit inverter
CT under-Current
3 2 1
Outside unit inverter compressor dis-
chrage temperature ove-rise
Compressor turned off due to master outside unit inverter
comppressor discharge temperature over-rise
Flow rate insufficiency or flow switch trouble of master
outside unit
3 4 1 Outside unit high pressure over-rise
Compressor turned off due to master outside unit high
pressure over-rise
Flow rate insufficiency or flow switch trouble of master
outside unit
3 5 1 Outside unit low pressure over-drop
Compressor turned off due to master outside unit low
pressure over-drop
3 6 1 Low pressure ratio Pressure ratio is under limit
3 9 1
Communication error between Outside
unit PFC and inverter board
Outside unit inverter compressor current detection (CT)
sensor disconnection or short circuit
4 0 1
Outside unit inverter compressor CT sen-
sor error
Outside unit inverter compressor current detection (CT)
sensor disconnection or short circuit
4 1 1
Outside unit inverter compressor dis-
charge temperature sensor error
Outside unit inverter compressor discharge temperature
sensor disconnection or short circuit
4 2 1 Outside unit under-voltage sensor error
Outside unit under-vlotage sensor disconnection or short
circuit
4 3 1 Outside unit over-voltage sensor error
Outside unit over-vlotage sensor disconnection or short
circuit
4 4 1 Outside unit air temperature sensor error
Outside unit air temperature sensor disconnection or
short circuit
4 5 1
Outside Unit Heat Exchanger
Temperature Sensor(A) Fault
Outside Unit Heat Exchanger Temperature Sensor(A)
Open or Short
4 6 1
Outside unit suction temperature sensor
error
Outside unit suction temperature sensor disconnection or
short circuit
5 1 1
Over-capacity
(Indoor unit capacity sum is excessive)
connection
Excessive connection f indoor unit connection display
value(Different from outside unit)
5 2 1
Communication error with master outside
unit inverter contrller
When the inverter controller signal is not received from
the master outside unit inverter controller
Test Run
ENGLISH
Installation Manual 61
Display Error item Root cause of error
5 3 1
Communication error with master outside
unit contrller and indoor unit
When the indoor uint control signal is not received from
the master outside unit inverter controller
5 7 1
Communication error between outside
unit inverter controller
Failing to receive inverter contoroller signal at Outdoor
Unit controller
6 0 1 Outside unit inverter PCB EEPROM error Oudoor unit inverter PCB EEPROM ACCESS error
6 2 1 Outside unit inverter IGBT over-rise error
Outside unit inverter IGBT when the temperature rises
above 110°C
6 5 1
Outside unit inverter IGBT temperature
sensor error
Outside unit inverter IGBT temperature sensor discon-
nection or short circuit
7 0 1 Outside unit static speed CT sensor error
Outside unit static speed CT sensor disconnection or
short circuit
7 1 1 PFC CT Sensor Error of Outdoor Unit Outdoor Unit PFC CT Sensor open or short
7 3 1
Outside unit inverter PCB input instant
over-current (Peak)
Outside unit inverter PCB input instant over-current
(Peak) exceeded
7 4 1
Outside unit inverter PCB phase imbal-
ance
When the master outside unit inverter PCB input current
is different
8 6 1 Outside unit master PCB EEPROM error
Communication error between master outside unit master
MICOM and EEPROM or EEPROM missing
8 8 1 PFC PCB EEPROM error
Communication error between Outside unit PFC and
EEPROM or EEPROM missing
1
1 3 1
Outside unit liquid pipe temperature sen-
sor error
Outside unit liquid pipe temperature sensor disconnection
or short circuit
1 5 1 1 Outside unit 4 way valve switch failure Outside unit 4 way valve switch error
1 8 0 1
Plate type heat exchanger freeze preven-
tion
Plate type heat exchanger freeze prevention error
1 8 1 1 Water temperature sensor error Water temperature sensor open/short
1 8 2 1 Communication error between MICOMs
Communication error between main MICOM and sub
MICOM
n Refer to the troubleshooting guide of service technical manual for each error.
Outside unit
Cooling tower applied method
62 Outside Unit
Cooling tower applied method
[Open type cooling tower + Second heat exchanger]
Heat exchanger is installed between the cooling tower
and outside unit system piping, and the temperature
difference between 1st side and 2nd side is main-
tained constantly
[Closed type cooling tower]
Heat source water of the cooling tower is supplied
directly to the outside unit system.
Open type
cooling tower
Closed type
cooling tower
1
st
side
2
nd
side
Heat exchange
When the open type cooling tower is used and the water supply is directly connected to the 2nd heat exchanger, product
damage by alien particle cannot be repaired for free.
- Always use the 2nd heat exchanger.
Caution For Refrigerant Leak
ENGLISH
Installation Manual 63
The installer and system specialist shall secure safety against leakage according to local regulations or standards.
The following standards may be applicable if local regulations are not available.
Though the R410A refrigerant is harmless and incombustible itself , the room to equip the air conditioner should be large to
such an extent that the refrigerant gas will not exceed the limiting concentration even if the refrigerant gas leaks in the room.
n Limiting concentration
Check limiting concentration along following steps and take appropriate measure depending on the situation.
n Calculate amount of all the replenished refrigerant (kg) per each refrigerant
system.
n Calculate minimum room capacity
Calculate room capacity by regarding a portion as one room or the smaller room.
(1) Without partition
(2) With partition and with opening which serve as
passage of air to adjoining room
Caution For Refrigerant Leak
Introduction
Checking procedure of limiting concentration
Limiting concentration is the limit of Freon gas concentration where immediate measures can be taken with-
out hurting human body when refrigerant leaks in the air. The limiting concentration shall be described in the
unit of kg/m
3
(Freon gas weight per unit air volume) for facilitating calculation.
Limiting concentration: 0.44kg/m
3
(R410A)
Outside unit
(No.1 system)
Flow of
refrigerant
Indoor unit
Room where refrigerant leaks
(Refrigerant of the whole No.1
system flows out.)
Amount of additional
replenished refrigerant
Total amount of replenished
refrigerant in refrigerant
facility (kg)
+
=
Note : In case one refrigerant facility is
divided into 2 or more refrigerant
systems and each system is
independent, amount of replenished
refrigerant of each system shall be
adopted.
Outside unit
Indoor unit
Outside unit
Indoor unit
Opening
Partition
In the case of opening
without door , or 0.15
% or more openings
(to floor space) both
above and below door)
Amount of replenished
refrigerant per one outside
unit system
Amount of replenished
refrigerant at factory shipment
Amount of additionally
replenished refrigerant
depending on piping
length or piping
diameter at customer
Caution For Refrigerant Leak
64 Outside Unit
(3) With partition and without opening which serve as passage of air to adjoining room
Calculate refrigerant concentration
n In case the concentration exceeds the limit
When the concentration exceeds the limit, change original plan or take one of the countermeasures
shown below:
• Countermeasure 1
Provide opening for ventilation.
Provide 0.15% or more opening to floor space both above and below door, or provide opening without
door.
• Countermeasure 2
Provide gas leak alarm linked with mechanical ventilator.
Reducing the outside refrigerant qty.
Pay a special attention to the place, such as a basement, etc. where refrigerant can stay, since refrigerant is
heavier than air.
Outside unit
Indoor unit
Smallest
room
(R410A)
=
Refrigerant concentration
(kg/m
3
)
Total amount of replenished
refrigerant in refrigerant facility (kg)
Capacity of smallest room where
indoor unit is installed (m
3
)
In case the result of calculation exceeds
the limiting concentration, perform the
same calculations by shifting to the
second smallest, and the third smallest
rooms until at last the result is below the
limiting concentration.
Countermeasure 2
Gas leak alarm
Mechanical ventilator
Countermeasure 1
Opening effective to ventilation
Indoor unit
Water Solenoid Valve Control
ENGLISH
Installation Manual 65
CN_26
CN_24
CN_22
MAIN PCBC_Box
Flow Switch
Solenoid
Valve
Water
Out
Water
In
L1
L2 3(A) 3(B)
4(A) 4(B)
CN_26
CN_24
CN_22
INTERNET
MAIN PCBC_Box
DDC BMS
Flow Switch
Solenoid
Valve
Water
Out
Water
In
L1
L2 3(A) 3(B)
4(A) 4(B)
Water Solenoid Valve Control
Set the dip switch refer to Fig.1 and turn on the power when you individual control for water solenoid valve
control.
For Mexico:
Model ARWN~~~GA2: Nominal voltage: 220 V~ 60 Hz
Figure 1
1234567
ON
1234567
ON
Central Control (Use DDC Port)
Individual Control (Use 208/230V Out Port)
66 Outside Unit
Variable Water Flow Control KIT(Accessory)
Variable Water Flow Control KIT(Accessory)
1. Shut off the main power line of outdoor unit.
2. Install the VWFC(Variable Water Flow Control) PCB in the C/BOX by using screws.
3. Install the transformer in the C/BOX by using screws.
4. Install the terminal block in the C/BOX by using screws.
5. Connect the Main PCB(CN41) to VWFC(CN_OUT) by using the cable assy.
6. Connect the blue wire of transformer to the Main PCB (JIG1(L), JIG2(N)).
7. Connect the red wire of transformer to the terminal block (2Pin Yellow terminal block).
8. Connect a power cable (DC 12V) to CN_PWR(12V, GND) of VWFC.
9. Connect a signal cable (DC 0~10V) of water flow control valve to CN_AO(AO_01(A+), GND(A-)) of VWFC.
10. Case of two water flow control valve, Connect a signal cable (DC 0~10V) of water flow control valve to
CN_AO(AO_02(B+), GND(B-)) of VWFC.
11. Connect a power cable (AC 24V) of water flow control valve to the terminal block (2Pin Yellow terminal block, Max cur-
rent 0.42A).
12. Connect the RS-485 communication cable to CN_COMM(BUS_A, BUS_B) of VWFC
13. Set up the main function Dip S/W of VWFC PCB.
14. Set up the Dip SW of outdoor main PCB.
15. Turn on the main power line of outdoor unit.
16. Check the signal of water flow control valve to CN_AO(AO_01, GND) of VWFC and the water flow rate.
VWFC PCB
Transformer
Terminal block
1. Install the product on flat surface and screw at least 2 places. Otherwise the VWFC PCB may not be anchored properly.
2. Do not deform the case at random. It may cause malfunction of the Variable Water Flow Control PCB
3. This is a class A product. In a non-industrial environment, this product may cause radio interference, in which case the user
may be required to take adequate measures.
USA, press #2 for PTAC, TTW
USA, press #3 for DFS, Multi V
CANADA
888-865-3026
888-865-3026
1-888-LG-Canada
www.lg.com
LG Customer Information Center
Register your product Online!
LGEUS
LG Electronics, Air conditioning Division
1000 Sylvan Ave., Englewood Cliffs, NJ 07632
LGECI
LG ELECTRONICS CANADA INC.
20 NORELCO DRIVE.
NORTH YORK, ONTARIO M9L 2X6.
Para México:
LG Electronics Mexico, S.A de C.V Av. Sor Juana lnes de la Cruz No. 555
Col. San Lorenzo Tlalnepantla, Estado de Mexico C.P. 54033
Tel. 5321 1919
Telefono sin costo 01 800 347 1919
US
Please call the installing contractor of your product, as warranty service will be
provided by them.
CANADA
Service call Number # : (888) LG Canada, (888) 542-2623
Numéro pour les appels de service : LG Canada, 1-888-542-2623
