INSTALLATION MANUAL
For safe and correct use, please read this installation manual thoroughly before installing the air-conditioner unit.
English
Air-Conditioners OUTDOOR UNIT
MXZ-8C140/160VAMD-A
EnglishEnglish
HFC
utilized
R410A
FOR INSTALLER
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2
Contents
1. Safety precautions
► Before installing the unit, make sure you read all the “Safety precautions”.
► Please report to or take consent by the supply authority before connec-
tion to the system.
After installation work has been completed, explain the “Safety Precautions” use,
and maintenance of the unit to the customer according to the information in the
Operation Manual and perform the test run to ensure normal operation. Both the
Installation Manual and Operation Manual must be given to the user for keeping.
These manuals must be passed on to subsequent users.
: Indicates a part which must be grounded.
Warning:
Carefully read the labels afxed to the main unit.
Warning:
• The unit must not be installed by the user. Ask a dealer or an authorized
technician to install the unit. If the unit is installed incorrectly, water leakage,
electric shock, or re may result.
• For installation work, follow the instructions in the Installation Manual and use
tools and pipe components specically made for use with R410A refrigerant.
• The R410A refrigerant in the HFC system is pressurized 1.6 times the pres-
sure of usual refrigerants. If pipe components not designed for R410A refrig-
erant are used and the unit is not installed correctly, the pipes may burst and
cause damage or injuries. In addition, water leakage, electric shock, or re
may result.
• The unit must be installed according to the instructions in order to minimize
the risk of damage from earthquakes, typhoons, or strong winds. An incor-
rectly installed unit may fall down and cause damage or injuries.
•
The unit must be securely installed on a structure that can sustain its weight.
If the unit is mounted on an unstable structure, it may fall down and cause
damage or injuries.
•
If the air conditioner is installed in a small room, measures must be taken to
prevent the refrigerant concentration in the room from exceeding the safety limit
in the event of refrigerant leakage. Consult a dealer regarding the appropriate
measures to prevent the allowable concentration from being exceeded.
Should the refrigerant leak and cause the concentration limit to be exceeded,
hazards due to lack of oxygen in the room may result.
• Ventilate the room if refrigerant leaks during operation. If refrigerant comes
into contact with a ame, poisonous gases will be released.
• All electric work must be performed by a qualied technician according to
local regulations and the instructions given in this manual. The units must
be powered by dedicated power lines and the correct voltage and circuit
breakers must be used. Power lines with insufcient capacity or incorrect
electrical work may result in electric shock or re.
• Be sure to connect the power supply cords and the connecting wires for
the indoor units, outdoor units, and branch boxes directly to the units (no
intermediate connections).
Intermediate connections can lead to communication errors if water enters
the cords or wires and causes insufcient insulation to ground or a poor
electrical contact at the intermediate connection point.
(If an intermediate connection is necessary, be sure to take measures to
prevent water from entering the cords and wires.)
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes,
to connect the refrigerant pipes. If the pipes are not connected correctly, the
unit will not be properly grounded and electric shock may result.
• Use only specied cables for wiring. The wiring connections must be made
securely with no tension applied on the terminal connections. Also, never
splice the cables for wiring (unless otherwise indicated in this document).
Failure to observe these instructions may result in overheating or a re.
• The terminal block cover panel of the outdoor unit must be rmly attached. If
the cover panel is mounted incorrectly and dust and moisture enter the unit,
electric shock or re may result.
• When installing or relocating, or servicing the outdoor unit, use only the
specied refrigerant (R410A) to change the refrigerant lines. Do not mix it
with any other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high pres-
sure in the refrigerant line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specied for the system will cause
mechanical failure or system malfunction or unit breakdown. In the worst
case, this could lead to a serious impediment to securing product safety.
• Use only accessories authorized by Mitsubishi Electric and ask a dealer
or an authorized technician to install them. If accessories are incorrectly
installed, water leakage, electric shock, or re may result.
• Do not alter the unit. Consult a dealer for repairs. If alterations or repairs are
not performed correctly, water leakage, electric shock, or re may result.
•
The user should never attempt to repair the unit or transfer it to another location.
If the unit is installed incorrectly, water leakage, electric shock, or re may
result. If the air conditioner must be repaired or moved, ask a dealer or an
authorized technician.
• After installation has been completed, check for refrigerant leaks. If refriger-
ant leaks into the room and comes into contact with the ame of a heater or
portable cooking range, poisonous gases will be released.
1.1. Before installation
Caution:
• Do not use the unit in an unusual environment. If the air conditioner is
installed in areas exposed to steam, volatile oil (including machine oil), or
sulfuric gas, areas exposed to high salt content such as the seaside, or areas
where the unit will be covered by snow, the performance can be signicantly
reduced and the internal parts can be damaged.
• Do not install the unit where combustible gases may leak, be produced,
ow, or accumulate. If combustible gas accumulates around the unit, re or
explosion may result.
Warning:
Describes precautions that must be observed to prevent danger of injury or
death to the user.
Caution:
Describes precautions that must be observed to prevent damage to the unit.
• The outdoor unit produces condensation during the heating operation. Make
sure to provide drainage around the outdoor unit if such condensation is
likely to cause damage.
• When installing the unit in a hospital or communications ofce, be prepared
for noise and electronic interference. Inverters, home appliances, high-
frequency medical equipment, and radio communications equipment can
cause the air conditioner to malfunction or breakdown. The air conditioner
may also affect medical equipment, disturbing medical care, and communi-
cations equipment, harming the screen display quality.
1.2. Before installation (relocation)
Caution:
• Be extremely careful when transporting the units. 2 or more persons are
needed to handle the unit, as it weighs 20 kg or more. Do not grasp the pack-
aging bands. Wear protective gloves to remove the unit from the packaging
and to move it, as you can injure your hands on the ns or the edge of other
parts.
• Be sure to safely dispose of the packaging materials. Packaging materials,
such as nails and other metal or wooden parts may cause stabs or other
injuries.
• The base and attachments of the outdoor unit must be periodically checked
for looseness, cracks or other damage. If such defects are left uncorrected,
the unit may fall down and cause damage or injuries.
• Do not clean the air conditioner unit with water. Electric shock may result.
• Tighten all are nuts to specication using a torque wrench. If tightened too
much, the are nut can break after an extended period and refrigerant can
leak out.
Conrmation of parts attached
In addition to this manual, the following parts are supplied with the outdoor unit.
They are used for grounding the S terminals of transmission terminal blocks TB3, TB7.
For details refer to “7. Electrical work”.
Grounding lead wire (× 2)
1. Safety precautions ................................................ 2
2. Installation diagram & parts ......................................... 3
3. Installation location ............................................... 4
4. Installing the outdoor unit .......................................... 6
5. Installing the refrigerant piping ...................................... 6
6. Drainage piping work ............................................. 10
7. Electrical work .................................................. 10
8. Test run ....................................................... 17
9. Special Functions ............................................... 18
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2.1. Before installation (Fig. 2-1)
This installation manual is only for the outdoor unit installation. In installing
the indoor units and branch box, refer to the installation manual attached
to each unit.
Any structural alterations necessary for the installation must comply with the local
building code requirements.
This diagram is intended to show the conguration of accessories.
For actual installation, the outdoor unit is to be turned 180°.
Units should be installed by licensed contractor according to local code requirement.
Note:
The dimensions given along the arrows above are required to guarantee the
air conditioner’s performance. Install the unit in as wide a place as possible
for later service or repairs.
Parts to be locally procured
Branch box/outdoor unit connecting wire (3-core)
1
Extension pipe
1
Wall hole sleeve
1
Wall hole cover
1
Pipe xing band
(The quantity depends on the pipe length.)
2 to 7
Fixing screw for 4 × 20 mm
(The quantity depends on the pipe length.)
2 to 7
Piping tape
1
Putty
1
Refrigeration oil
1
Power supply cord (2-core, Refer to 7.3. Wiring transmission cables)
1
1.3. Before electric work
Caution:
• Be sure to install circuit breakers. If not installed, electric shock may result.
IMPORTANT
Make sure that the current leakage breaker is one compatible with higher
harmonics.
Always use a current leakage breaker that is compatible with higher har-
monics as this unit is equipped with an inverter.
The use of an inadequate breaker can cause the incorrect operation of in-
verter.
• For the power lines, use standard cables of sufcient capacity. Otherwise, a
short circuit, overheating, or re may result.
• When installing the power lines, do not apply tension to the cables. If the
connections are loosened, the cables can snap or break and overheating or
re may result.
• Be sure to ground the unit. Do not connect the ground wire to gas or water
pipes, lighting rods, or telephone grounding lines. If the unit is not properly
grounded, electric shock may result.
• Use circuit breakers (ground fault interrupter, isolating switch (+B fuse), and
molded case circuit breaker) with the specied capacity. If the circuit breaker
capacity is larger than the specied capacity, breakdown or re may result.
1.4. Before starting the test run
Caution:
•
Turn on the main power switch more than 12 hours before starting operation.
Starting operation just after turning on the power switch can severely dam-
age the internal parts. Keep the main power switch turned on during the
operation season.
• Before starting operation, check that all panels, guards and other protective
parts are correctly installed. Rotating, hot, or high voltage parts can cause
injuries.
• Do not touch any switch with wet hands. Electric shock may result.
• Do not touch the refrigerant pipes with bare hands during operation. The
refrigerant pipes are hot or cold depending on the condition of the owing
refrigerant. If you touch the pipes, burns or frostbite may result.
• After stopping operation, be sure to wait at least 5 minutes before turning off
the main power switch. Otherwise, water leakage or breakdown may result.
1.5. Using R410A refrigerant air conditioners
Caution
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes,
to connect the refrigerant pipes. Make sure the insides of the pipes are clean
and do not contain any harmful contaminants such as sulfuric compounds,
oxidants, debris, or dust. Use pipes with the specied thickness. (Refer to
page 6) Note the following if reusing existing pipes that carried R22 refriger-
ant.
- Replace the existing are nuts and are the ared sections again.
- Do not use thin pipes. (Refer to page 6)
• Store the pipes to be used during installation indoors and keep both ends of
the pipes sealed until just before brazing. (Leave elbow joints, etc. in their
packaging.) If dust, debris, or moisture enters the refrigerant lines, oil dete-
rioration or compressor breakdown may result.
• Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration
oil applied to the ared sections. If mineral oil is mixed in the refrigeration
oil, oil deterioration may result.
• Do not use refrigerant other than R410A refrigerant. If another refrigerant is
used, the chlorine will cause the oil to deteriorate.
• Use the following tools specically designed for use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant. Contact your
nearest dealer for any questions.
Tools (for R410A)
Gauge manifold Flare tool
Charge hose Size adjustment gauge
Gas leak detector Vacuum pump adapter
Torque wrench Electronic refrigerant charging scale
• Be sure to use the correct tools. If dust, debris, or moisture enters the refrig-
erant lines, refrigeration oil deterioration may result.
• Do not use a charging cylinder. If a charging cylinder is used, the composi-
tion of the refrigerant will change and the efciency will be lowered.
1. Safety precautions
2. Installation diagram & parts
Fig. 2-1
Outdoor unit
Branch box
5-branches type
3-branches type
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3. Installation location
3.1. Refrigerant pipe
Refer to 5.2. Pipe length and height difference.
3.2. Choosing the outdoor unit installation location
• Avoid locations exposed to direct sunlight or other sources of heat.
• Select a location from which noise emitted by the unit will not inconvenience
neighbors.
• Select a location permitting easy wiring and pipe access to the power source and
indoor unit.
• Avoid locations where combustible gases may leak, be produced, ow, or accumu-
late.
• Note that water may drain from the unit during operation.
• Select a level location that can bear the weight and vibration of the unit.
• Avoid locations where the unit can be covered by snow. In areas where heavy
snow fall is anticipated, special precautions such as raising the installation location
or installing a hood on the air intake must be taken to prevent the snow from
blocking the air intake or blowing directly against it. This can reduce the airow and
a malfunction may result.
• Avoid locations exposed to oil, steam, or sulfuric gas.
• Use the transportation handles of the outdoor unit to transport the unit. If the unit is
carried from the bottom, hands or ngers may be pinched.
3.3. Outline dimensions (Outdoor unit) (Fig. 3-1)
3.4.
Constraints on indoor unit and branch box installation
You should note that indoor units that can be connected to this outdoor unit have
the following constraints.
• Indoor units with model in table 2 can be connected.
• For the number of units that can be connected, refer to Table 1 below.
• The total rated capacity (cooling) of the connected indoors units (refer to Table 2)
must not exceed 130% of the outdoor unit capacity (refer to the capacity range of
connected units in Table 1).*
In addition, up to 2 branch boxes can be connected.
Table 1: Number of units that can be connected and capacity range of connected units
Outdoor unit
model name
The capacity of
outdoor unit
Number of units that
can be connected
Capacity range of
connected units
MXZ-8C140 14.0 kW 2 – 8 units 4.4 – 18.2 kW
MXZ-8C160 15.5 kW 2 – 8 units 4.4 – 20.2 kW
Table 2: Rated capacity (cooling) of the indoor units
M series, S series and P series
Indoor unit type 22 25 35 42 50 60 71 80 100
Rated capacity (kW) 2.2 2.5 3.5 4.2 5.0 6.0 7.1 8.0 10.0
Example: MXZ-8C160
MSZ-50 = 5.0
+
MSZ-42 = 4.2
+
MSZ-35 = 3.5
+
SEZ-35 = 3.5
+
SEZ-25 = 2.5
Combinations in which the total capacity of indoor units exceeds the capacity of the
outdoor unit will reduce the cooling capacity of each indoor unit below their rated
cooling capacity. Thus, combine indoor units with an outdoor unit within the outdoor
unit’s capacity, if possible.
3.5. Ventilation and service space
3.5.1. Windy location installation
When installing the outdoor unit on a rooftop or other location unprotected from the
wind, situate the air outlet of the unit so that it is not directly exposed to strong winds.
Strong wind entering the air outlet may impede the normal airow and a malfunction
may result.
The following shows 3 examples of precautions against strong winds.
1 Face the air outlet towards the nearest available wall about 50 cm away from the
wall. (Fig. 3-2)
2 Install an optional air guide if the unit is installed in a location where strong winds
from a typhoon, etc. may directly enter the air outlet. (Fig. 3-3)
A Air guide
3 Position the unit so that the air outlet blows perpendicularly to the seasonal wind
direction, if possible. (Fig. 3-4)
B Wind direction
Fig. 3-1
Fig. 3-2
Fig. 3-3
Fig. 3-4
330+30
370
1050
225
600
1338
(mm)
B
A
Total rated capacity
18.7 ≤ 20.2 kW
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3. Installation location
3.5.2. When installing a single outdoor unit
Minimum dimensions are as follows, except for Max., meaning Maximum dimen-
sions, indicated.
Refer to the gures for each case.
1 Obstacles at rear only (Fig. 3-5)
2 Obstacles at rear and above only (Fig. 3-6)
3 Obstacles at rear and sides only (Fig. 3-7)
** To receive the DRED signals for demand control, the clearance is 350 mm or more.
4 Obstacles at front only (Fig. 3-8)
* When using the optional air outlet guides, the clearance is 500 mm or more.
5 Obstacles at front and rear only (Fig. 3-9)
* When using the optional air outlet guides, the clearance is 500 mm or more.
6 Obstacles at rear, sides, and above only (Fig. 3-10)
• Do not install the optional air outlet guides for upward airow.
** To receive the DRED signals for demand control, the clearance is 350 mm or more.
∗∗
∗∗
∗∗∗
∗∗∗
3.5.3. When installing multiple outdoor units
Leave 25 mm space or more between the units.
***
To receive the DRED signals for demand control, the clearance is 350 mm or more.
1 Obstacles at rear only (Fig. 3-11)
2 Obstacles at rear and above only (Fig. 3-12)
• No more than 3 units must be installed side by side. In addition, leave space as shown.
• Do not install the optional air outlet guides for upward airow.
3 Obstacles at front only (Fig. 3-13)
*
When using the optional air outlet guides, the clearance is 1000 mm or more.
4 Obstacles at front and rear only (Fig. 3-14)
* When using the optional air outlet guides, the clearance is 1000 mm or more.
5 Single parallel unit arrangement (Fig. 3-15)
* When using the optional air outlet guides installed for upward airow, the clearance is
1000 mm or more.
6 Multiple parallel unit arrangement (Fig. 3-16)
* When using the optional air outlet guides installed for upward airow, the clearance is
1500 mm or more.
7 Stacked unit arrangement (Fig. 3-17)
• The units can be stacked up to 2 units high.
•
No more than 2 stacked units must be installed side by side. In addition, leave space as shown.
Fig. 3-8Fig. 3-7Fig. 3-6Fig. 3-5
Fig. 3-9 Fig. 3-10 Fig. 3-11
Fig. 3-12
Fig. 3-15 Fig. 3-16 Fig. 3-17
Fig. 3-13 Fig. 3-14
150
1000
1000
200
200
300
Max. 500
1000
150
300
Max. 500
1500
500
250
250
300
500
1500
Max. 300
1500
1500
1500
500
1000
600
2000
150
500
3000
1500
600
1500
800
150
(mm)
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4. Installing the outdoor unit
• Be sure to install the unit in a sturdy, level surface to prevent rattling noises dur-
ing operation. (Fig. 4-1)
<Foundation specications>
Foundation bolt M10
Thickness of concrete 120 mm
Length of bolt 70 mm
Weight-bearing capacity 320 kg
• Make sure that the length of the foundation bolt is within 30 mm of the bottom
surface of the base.
• Secure the base of the unit rmly with four-M10 foundation bolts in sturdy loca-
tions.
Installing the outdoor unit
• Do not block the vent. If the vent is blocked, operation will be hindered and break-
down may result.
• In addition to the unit base, use the installation holes on the back of the unit to
attach wires, etc., if necessary to install the unit. Use self-tapping screws (ø5 ×
15 mm or less) and install on site.
Warning:
• The unit must be securely installed on a structure that can sustain its
weight.
If the unit is mounted on an unstable structure, it may fall down and cause
damage or injuries.
• The unit must be installed according to the instructions in order to mini-
mize the risk of damage from earthquakes, typhoons, or strong winds. An
incorrectly installed unit may fall down and cause damage or injuries.
Caution:
• Install the unit on a rigid structure to prevent excessive operation sound or
vibration.
* To receive the DRED signals for demand control, the clearance is 350 mm
or more.
** To receive the DRED signals for demand control, the clearance is 800 mm or
more.
5. Installing the refrigerant piping
5.1. Precautions for devices that use R410A refrigerant
• Refer to page 3 for precautions not included below on using air conditioners with
R410A refrigerant.
• Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration oil ap-
plied to the ared sections.
•
Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to con-
nect the refrigerant pipes. Use refrigerant pipes with the thicknesses specied in the
table to the below. Make sure the insides of the pipes are clean and do not contain
any harmful contaminants such as sulfuric compounds, oxidants, debris, or dust.
Warning:
When installing or relocating, or servicing the outdoor unit, use only the speci-
ed refrigerant (R410A) to charge the refrigerant lines. Do not mix it with any
other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high pres-
sure in the refrigerant line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specied for the system will cause
mechanical failure or system malfunction or unit breakdown. In the worst
case, this could lead to a serious impediment to securing product safety.
ø6.35 mm, ø9.52 mm, ø12.7 mm Thickness 0.8 mm
ø15.88 mm Thickness 1.0 mm
• Do not use pipes thinner than those specied above.
• The thicknesses listed in the table above are based on Japanese standards.
Use pipes with a maximum working pressure of 4.15 MPa or higher accord-
ing to local standards.
Permissible
length
(one-way)
Total piping length c1 + b1 + b2 + a1 + a2 + a3 + a4 + a5 + a6 ≤ 150 m
Farthest piping length (L) c1 + b2 + a6 ≤ 80 m (b2 ≤ 55 m, a6 ≤ 25 m)
Piping length between outdoor unit and branch boxes c1 + b1 + b2 ≤ 55 m
Farthest branch box from the rst joint (b2) b2 ≤ 30 m
Farthest piping length after branch box (l) a6 ≤ 25 m
Total piping length between branch boxes and indoor units a1 + a2 + a3 + a4 + a5 + a6 ≤ 95 m
Permissible
height difference
(one-way)
In indoor/outdoor section (H) *1 H ≤ 30 m (In case of outdoor unit is set higher than indoor unit)
H ≤ 20 m (In case of outdoor unit is set lower than indoor unit)
In branch box/indoor unit section (h1) h1 + h2 ≤ 15 m
In each branch unit (h2) h2 ≤ 15 m
In each indoor unit (h3) h3 ≤ 12 m
Number of bends
|
c1 +
b1 + a1 |, |
c1 +
b1 + a2 |, |
c1 +
b1 + a3 |, |
c1 +
b1 + a4 |, |
c1 +
b1 + a5 |, |
c1 +
b2 +
a6 | ≤ 15
*1 Branch box should be placed within the level between the outdoor unit and indoor units.
B
D
B
C C C
C
C
L
I
h2
b2
b1
c1
a5
a6
a4a3a2
h3
h1
H
a1
Fig. 5-1
Fig. 4-1
B
(mm)
A M10 (3/8") bolt
B Base
C As long as possible.
D Vent
E Set deep in the ground
D
A
C
E
Min. 475
Min. 25
Max. 30
600 600
225 225
330
370
25
1050
A Outdoor unit
B Branch box
C Indoor unit
D The rst joint
∗
∗∗
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(1) Valve size for outdoor unit
For liquid ø9.52 mm
For gas ø15.88 mm
(2) Valve size for branch box
A UNIT
Liquid pipe ø6.35 mm
Gas pipe ø9.52 mm
B UNIT
Liquid pipe ø6.35 mm
Gas pipe ø9.52 mm
C UNIT
Liquid pipe ø6.35 mm
Gas pipe ø9.52 mm
D UNIT
Liquid pipe ø6.35 mm
Gas pipe ø9.52 mm
E UNIT
Liquid pipe ø6.35 mm
Gas pipe ø12.7 mm
* 3-branch type : only A, B, C unit
Conversion formula
1/4 F ø6.35
3/8 F ø9.52
1/2 F ø12.7
5/8 F ø15.88
3/4 F ø19.05
5.4. Selecting pipe size (Fig. 5-2)
Conversion formula
A B
Liquid ø9.52 mm
The piping connection size differs according to
the type and capacity of indoor units. Match the
piping connection size of branch box with indoor
unit.
If the piping connection size of branch box does
not match the piping connection size of indoor
unit, use optional different-diameter (deformed)
joints to the branch box side. (Connect deformed
joint directly to the branch box side.)
Gas ø15.88 mm
Different-diameter joint (optional parts) (Fig. 5-3)
Model name
Connected pipes diameter Diameter A Diameter B
mm mm mm
MAC-A454JP ø9.52 → ø12.7 ø9.52 ø12.7
MAC-A455JP ø12.7 → ø9.52 ø12.7 ø9.52
MAC-A456JP ø12.7 → ø15.88 ø12.7 ø15.88
PAC-493PI ø6.35 → ø9.52 ø6.35 ø9.52
PAC-SG76RJ-E ø9.52 → ø15.88 ø9.52 ø15.88
Piping preparation
1 Table below shows the specications of pipes commercially available.
Outside diameter Insulation thickness
Insulation material
mm mm
6.35 8
Heat resisting foam plastic 0.045
specic gravity
9.52 8
12.7 8
15.88 8
2 Ensure that the 2 refrigerant pipes are insulated to prevent condensation.
3 Refrigerant pipe bending radius must be 100 mm or more.
Caution
Be sure to use the insulation of specied thickness. Excessive thickness may
cause incorrect installation of the indoor unit and branch box, and lack of
thickness may cause dew drippage.
2-branch pipe (Joint) : Optional parts (According to the connection method,
you can choose the favorite one.
Model name Connection method
MSDD-50AR-E are
MSDD-50BR-E brazing
■ Installation procedure (2 branches pipe (Joint))
Refer to the installation manuals of MSDD-50AR-E and MSDD-50BR-E.
A
B B B B B
A
A
A
BBBBB
B
A
5. Installing the refrigerant piping
Fig. 5-2
5.3. Additional refrigerant charge
Additional refrigerant charge
• The necessity of additional refrigerant is determined according to the to-
tal piping length (c1+b1+b2+a1+a2+a3+a4+a5+a6) and the total capacity of
indoor units. Refer to the chart to the right.
• If additional refrigerant is necessary, charge the unit with additional re-
frigerant according to the permitted pipe length in the chart to the right.
In addition, in order to carry out service, enter the size and length of each liquid pipe
and additional refrigerant charge amounts in the spaces provided on the “Refrigerant
amount” plate on the outdoor unit.
Calculation of additional refrigerant charge
• Calculate the additional charge using the liquid pipe size and length of the ex-
tended piping and total capacity of connected indoor units.
• Calculate the additional refrigerant charge using the procedure shown to the
right, and charge with the additional refrigerant.
• For amounts less than 0.1 kg, round up the calculated additional refrigerant
charge.
(For example, if the calculated charge is 2.81 kg, round up the charge to 2.9 kg.)
<Additional Charge>
Necessity of additional charge
Total capacity of
indoor units
Total piping length
0 m – 5 m 6 m – 15 m 16 m –
– 16.0 kW Not necessary Not necessary Necessary
16.1 kW – 20.2 kW * Not necessary Necessary Necessary
* For MXZ-8C140, the capacity is 16.1 – 18.2 kW.
Calculation of refrigerant charge
Pipe size Liquid pipe
+
Pipe size Liquid pipe
–
0.2 kg
ø6.35 ø9.52
(m) × 19.0 (g/m) (m) × 50.0 (g/m)
* For amounts less than 0 kg, use 0 kg.
Included refrigerant amount when shipped from the factory
Included refrigerant amount
8.0 kg
<Example>
Outdoor model : MXZ-8C160VAMD c1 + b1 : ø9.52 30 m
Indoor 1 : model 71 a1 : ø9.52 15 m
2 : model 42 a2 : ø6.35 10 m
3 : model 25 a3 : ø6.35 10 m
4 : model 25 a4 : ø6.35 20 m
The total length of each liquid line is as follows:
ø9.52 : c1 + b1 + a1 = 30 + 15 = 45 m
ø6.35 : a2 + a3 + a4 = 10 + 10 + 20 = 40 m
<Calculation example>
Additional refrigerant charge
40 ×
19.0
+ 45 ×
50.0
– 0.2 = 2.9 (rounded up)
1000 1000
5.2. Pipe length and height difference (Fig. 5-
1)
Flared connections
• This unit has ared connections on each indoor unit and branch box and outdoor
unit sides.
• Remove the valve cover of the outdoor unit, then connect the pipe.
• Refrigerant pipes are used to connect the branch box and outdoor unit.
At the conditions
below:
Fig. 5-3
■ In case of using 2-branch boxes
■ In case of using 1-branch box
Flare connection employed. (No. brazing)
Branch box
Branch box #2
Branch box #1
2 branches pipe (joint)
: optional parts.
BH79D391L03_EN.indd 7 7/17/2015 1:08:18 PM
8
øA
5. Installing the refrigerant piping
Warning:
When pumping down the refrigerant, stop the compressor before disconnect-
ing the refrigerant pipes. The compressor may burst and cause injury if any
foreign substance, such as air, enters the system.
5.5. Connecting pipes (Fig. 5-4) (Fig. 5-5)
• Conduct sufcient anti-condensation and insulation work to prevent water drip-
ping from the refrigerant piping. (liquid pipe/gas pipe)
• Increase insulation depending on the environment where the refrigerant piping is
installed, or condensation may occur on the surface of the insulation material.
(Insulation material Heat-resistant temperature: 120 °C, Thickness: 15 mm or
more)
* When the refrigerant piping is used in locations subject to high tempera-
ture and humidity such as in the attic, further addition of insulation may be
required.
• To insulate the refrigerant piping, apply heat-resistant polyethylene foam between
the indoor unit and insulation material as well as to the net between the insulation
material lling all gaps.
(Condensation forming on the piping may result in condensation in the room or
burns when contacting the piping.)
• The indoor parts of the drain pipe should be wrapped with polyethylene foam insu-
lation materials (specic gravity of 0.03, thickness of 9 mm or more).
[Fig. 5-5]
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening
are nut. A
• Use 2 wrenches to tighten piping connections. B
• Use leak detector or soapy water to check for gas leaks after connections are
completed.
• Apply refrigerating machine oil over the entire are seat surface. C
• Use the are nuts as follows. D
Warning:
When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
■ Pipe size (Outdoor unit-Branch box)
Pipe size
(ømm)
Liquid ø9.52
Gas
ø15.88
■ Pipe size (Branch box-Indoor unit) *Case of M series or S series Indoor unit
Indoor unit type 22 25 35 42 50 60 71 80
Pipe
size
(ømm)
Liquid ø6.35 ø6.35 ø6.35 ø6.35 ø6.35 ø6.35 ø9.52 ø9.52
Gas ø9.52 ø9.52 ø9.52 ø9.52 ø12.7 ø15.88 ø15.88 ø15.88
■ Pipe size (Branch box-Indoor unit) *Case of P series Indoor unit
Indoor unit type 50 60 71 100
Pipe size
(ømm)
Liquid
ø6.35 ø9.52 ø9.52 ø9.52
Gas
ø12.7 ø15.88 ø15.88 ø15.88
• When bending the pipes, be careful not to break them. Bend radius of 100 mm to
150 mm are sufcient.
• Make sure the pipes do not contact the compressor. Abnormal noise or vibration
may result.
1 Pipes must be connected starting from the indoor unit.
Flare nuts must be tightened with a torque wrench.
2 Flare the liquid pipes and gas pipes and apply a thin layer of refrigeration oil (Ap-
plied on site).
• When usual pipe sealing is used, refer to Table 2 for aring of R410A refrigerant
pipes.
The size adjustment gauge can be used to conrm A measurements.
Caution:
• Be sure to wrap insulation around the piping. Direct contact with the bare
piping may result in burns or frostbite.
Table 2 (Fig. 5-6) (mm)
Copper pipe O.D.
A
Flare tool for R410A Flare tool for R22·R407C
Clutch type
ø6.35 0 - 0.5 1.0 - 1.5
ø9.52 0 - 0.5 1.0 - 1.5
ø12.7 0 - 0.5 1.0 - 1.5
ø15.88 0 - 0.5 1.0 - 1.5
The lineup of a connectable indoor unit
depends on a district/areas/country.
A (Fig. 5-5)
Copper pipe O.D.
(mm)
Flare dimensions
øA dimensions (mm)
ø6.35 8.7 - 9.1
ø9.52 12.8 - 13.2
ø12.7 16.2 - 16.6
ø15.88 19.3 - 19.7
Copper pipe O.D.
(mm)
Flare nut O.D.
(mm)
Tightening torque
(N·m)*
ø6.35 17 14 - 18
ø6.35 22 34 - 42
ø9.52 22 34 - 42
ø9.52 26 49 - 61
ø12.7 26 49 - 61
ø12.7 29 68 - 82
ø15.88 29 68 - 82
ø15.88 36 100 - 120
* 1 N·m
10 kgf·cm
A
B
C
D
A Liquid pipe
B Gas pipe
C Insulation
D Taping
Fig. 5-4
Fig. 5-5
Fig. 5-6
A Flare cutting dimensions
B Flare nut tightening torque
90° ± 0.5°
45° ± 2°
R0.4 to R0.8
A Die
B Copper pipe
A
(mm)
BH79D391L03_EN.indd 8 7/17/2015 1:08:18 PM
9
5.6. Refrigerant piping (Fig. 5-7)
Remove the service panel D (3 screws) and the front piping cover A (2 screws) and
rear piping cover B (4 screws).
1 Perform refrigerant piping connections for the indoor/outdoor unit when the
outdoor unit’s stop valve is completely closed.
2 Vacuum-purge air from the indoor unit and the connection piping.
Evacuation
Evacuate with the valve of the outdoor unit closed and evacuate both the connec-
tion piping and the indoor unit from the service port provided on the valve of the
outdoor unit using a vacuum pump. (Always evacuate from the service port of both
liquid pipe and gas pipe.) After the vacuum reaches 650 Pa [abs], continue evacu-
ation for at least one hour or more. Then, stop the vacuum pump and leave it for 1
hour. Ensure the degree of vacuum has not increased. (If the degree of vacuum
increase is larger than 130 Pa, water might have entered. Apply pressure to
dry nitrogen gas up to 0.05 MPa and vacuum again.) Finally, seal in with the
liquid refrigerant through the liquid pipe, and adjust the gas piping to obtain an ap-
propriate amount of the refrigerant during operation.
* Never perform air purging using refrigerant.
3 After connecting the refrigerant pipes, check the connected pipes and the
indoor unit for gas leaks. (Refer to 5.8 Refrigerant pipe airtight testing method)
4 Vacuumize the refrigerant lines through the service port of the liquid and gas
stop valves. And then open the stop valves completely (for both the liquid and
gas stop valves). This will completely connect the refrigerant lines of the indoor
and outdoor units.
• If the stop valves are left closed and the unit is operated, the compressor
and control valves will be damaged.
• Use a leak detector or soapy water to check for gas leaks at the pipe con-
nection sections of the outdoor unit.
• Do not use the refrigerant from the unit to purge air from the refrigerant
lines.
• After the valve work is completed, tighten the valve caps to the correct
torque: 20 to 25 N·m (200 to 250 kgf·cm).
Failure to replace and tighten the caps may result in refrigerant leakage. In
addition, do not damage the insides of the valve caps as they act as a seal
to prevent refrigerant leakage.
5 Use sealant to seal the ends of the thermal insulation around the pipe connec-
tion sections to prevent water from entering the thermal insulation.
Refrigerant pipes are protectively wrapped
• The pipes can be protectively wrapped up to a diameter of ø90 mm before or after
connecting the pipes. Cut out the knockout in the pipe cover following the groove
and wrap the pipes.
Pipe inlet gap
• Use putty or sealant to seal the pipe inlet around the pipes so that no gaps remain.
(If the gaps are not closed, noise may be emitted or water and dust will enter the
unit and breakdown may result.)
5.7. Caution for piping connection/valve operation
• Conduct piping connection and valve operation accurately by following the gure
below.
• Apply sealer along the insulator to prevent water entering the insulator covering
the refrigerant pipe joints.
• After evacuation and refrigerant charge, ensure that the handle is fully open. If
operating with the valve closed, abnormal pressure will be imparted to the high- or
low-pressure side of the refrigerant circuit, giving damage to the compressor, etc.
• Determine the amount of additional refrigerant charge (refer “5.3. Additional refrig-
erant charge”), and charge refrigerant additionally through the service port after
completing piping connection work.
• After completing work, tighten the service port (12 - 15 N·m) and cap (20 - 25 N·m)
securely to prevent gas leak.
*1 N·m
10 kgf·cm
Method of completely opening the stop valve
The stop valve opening method varies according to the outdoor unit model. Use the
appropriate method to open the stop valves.
(1) Gas side (Fig. 5-8)
1 Remove the cap, pull the handle toward you and rotate 1/4 turn in a counterclock-
wise direction to open.
2 Make sure that the stop valve is open completely, push in the handle and rotate
the cap back to its original position.
(2) Liquid side (Fig. 5-9)
1 Remove the cap and turn the valve rod counterclockwise as far as it will go with
the use of a 4 mm hexagonal wrench. Stop turning when it hits the stopper.
2 Make sure that the stop valve is open completely and rotate the cap back to its
original position.
5. Installing the refrigerant piping
Fig. 5-7
Fig. 5-8
Fig. 5-9
A Valve F Completely closed
B Unit side G Completely open
C Service port H Refrigerant piping side (On-site installation)
D Handle I Direction the refrigerant ows in
E Cap J Wrench hole
A Front piping cover
B Piping cover
C Stop valve
D Service panel
E Bend radius : 100 mm - 150 mm
B
C
EA
D
(1)
B
C
J
I
H
E
(2)
BH79D391L03_EN.indd 9 7/17/2015 1:08:20 PM
10
6. Drainage piping work
5. Installing the refrigerant piping
Precautions when using the charge valve (Fig. 5-11)
Do not tighten the service port too much when installing it, otherwise, the valve core
could be deformed and become loose, causing a gas leak.
After positioning section B in the desired direction, turn section A only and tighten it.
Do not further tighten sections A and B together after tightening section A.
Outdoor unit drainage pipe connection
When drain piping is necessary, use the drain socket or the drain pan (option).
Drain socket PAC-SG61DS-E
Drain pan PAC-SH97DP-E
7. Electrical work
* The figure to the left is an example only.
The stop valve shape, service port po-
sition, etc., may vary according to the
model.
* Turn section A only.
(Do not further tighten sections A and
B together.)
C Charge hose
D Service port
LO
HI
A
C D
B
K
E F
G
H
I
Fig. 5-11
Warning:
• When installing the unit, securely connect the refrigerant pipes before
starting the compressor.
Fig. 5-10
7.1. Caution
1 Follow ordinance of your governmental organization for technical standard
related to electrical equipment, wiring regulations and guidance of each electric
power company.
2 Wiring for control (hereinafter referred to as transmission line) shall be (5 cm
or more) apart from power source wiring so that it is not inuenced by electric
noise from power source wiring. (Do not insert transmission line and power
source wire in the same conduit.)
3 Be sure to provide designated grounding work to outdoor unit.
4 Give some allowance to wiring for electrical part box of indoor and outdoor
units, because the box is sometimes 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. If transmission lines of different
systems are wired with the same multiplecore cable, the resultant poor trans-
mitting and receiving will cause erroneous operations.
7 Only the transmission line specied should be connected to the terminal block
for outdoor unit transmission.
(Transmission line to be connected with indoor unit : Terminal block TB3 for
transmission line, Other : Terminal block TB7 for centralized control)
Erroneous connection does not allow the system to operate.
8 In case to connect with the upper class controller or to conduct group operation
in different refrigerant systems, the control line for transmission is required
between the outdoor units each other.
Connect this control line between the terminal blocks for centralized control.
(2-wire line with no polarity)
When conducting group operation in different refrigerant systems without con-
necting to the upper class controller, replace the insertion of the short circuit
connector from CN41 of one outdoor unit to CN40.
9 Before turning outdoor unit on, be sure to turn the indoor units and the branch
boxes.
5.8. Refrigerant pipe airtight testing method.
Airtight test (Fig. 5-10)
Airtight test should be made by pressurizing nitrogen gas. For the test method, refer
to the following gure.
(1) Connecting the testing tool. Make a test with the stop valve closed. Be also sure
to pressurize both liquid or high-pressure pipe and gas or low pressure pipe.
(2) Do not add pressure to the specied pressure all at once; add pressure little by
little.
1 Pressurize to 0.5 MPa, wait 5 minutes, and make sure the pressure does not
decrease.
2 Pressurize to 1.5 MPa, wait 5 minutes, and make sure the pressure does not
decrease.
3 Pressurize to 4.15 MPa and measure the surrounding temperature and refrig-
erant pressure.
(3) If the specied pressure holds for about one day and does not decrease, the
pipes have passed the test and there are no leaks.
• If the surrounding temperature changes by 1°C, the pressure will change by
about 0.01 MPa. Make the necessary corrections.
(4) If the pressure decreases in steps (2) or (3), there is a gas leak. Look for the
source of the gas leak.
A Nitrogen gas F Outdoor unit
B System analyzer G Stop valve
C Lo-knob H Liquid pipe or high-pressure pipe
D Hi-knob I Gas pipe or low-pressure pipe
E To branch box K Service port
BH79D391L03_EN.indd 10 7/17/2015 1:08:20 PM
11
OC
BC
A B C D E
BC
A B C
RC
ICIC IC IC IC
RC
R
C
R
C
R
C
IC IC
R
C
IC
R
C
R
C
OC
BC
A B C D E
BC
A B C
IC
RC
IC IC
RC
R
C
IC
R
C
IC
R
C
7. Electrical work
7.3. Wiring transmission cables
1 Types of control cables
1. Wiring transmission cables
• Types of transmission cables: Shielding wire CVVS or CPEVS or MVVS
• Cable diameter: More than 1.25 mm
2
• Maximum wiring length: Within 200 m
2. M-NET Remote control cables
Kind of remote control cable Shielding wire (2-core) CVVS, CPEVS or MVVS.
Cable diameter 0.5 to 1.25 mm
2
Remarks
When 10 m is exceeded, use cable with the
same specications as transmission line wiring.
* Connected with simple remote controller.
M1
S
M2
D GA
E
M1
S
M2
TB3TB1 TB7
F
B1 B2
TB1B
C
B
L
N
1 2 3 C
TBD1
A Power source
B Power supply for branch box
C Screw on the electrical component box
D Transmission line
7.2. Control box and connecting position of wiring
(Fig. 7-1)
1. Connect the branch box transmission line to transmission terminal block (TB3),
or connect the wiring between outdoor units or the wiring with the centralized
control system to the centralized control terminal block (TB7).
When using shielded wiring, connect shield ground of the branch box transmis-
sion line to the screw (E or F) and connect shield ground of the line between
outdoor units and the central control system transmission line to the shield (S)
terminal of the centralized control terminal block (TB7) shield (S) terminal. In
addition, in the case of outdoor units whose power supply connector CN41 has
been replaced by CN40, the shield terminal (S) of terminal block (TB7) of the
centralized control system should also be connected to the screw (E or F) using
attached lead wire.
2. Fix power source wiring to terminal box by using buffer bushing for tensile force
(PG connection or the like).
3. The terminal bed (TB1B) is for supplying power to the branch box (230 V. max
6A).
4. The terminal bed (TBD1) is for the input of the DRED signals (DC 12 V, 1 mA).
Caution:
Never connect the transmission line for the branch box or the central control
system transmission line to this terminal bed (TB1B). If the transmission
lines are connected, the indoor unit terminal block, branch box terminal
block or centralized control terminal block could be damaged.
Fig. 7-1
E Screw on the electrical component box
F Screw on the electrical component box
G DRED signal input
3. MA Remote control cables
Kind of remote control cable Sheathed 2-core cable (unshielded) CVV
Cable diameter 0.3 to 1.25 mm
2
Remarks Within 200 m
* Connected with simple remote controller.
2 Wiring examples
• Controller name, symbol and allowable number of controllers.
Name Symbol Allowable number of controllers
Outdoor unit controller OC –
Indoor unit controller IC
MXZ-8C140 2 to 8 units per 1 OC
MXZ-8C160 2 to 8 units per 1 OC
Remote controller RC MA Maximum of 2 per group
(5-branch type)
(3-branch type)
(5-branch type) (3-branch type)
[1] Basic systems
OC: Outdoor unit
BC: Branch box
IC: Indoor unit
RC: Remote controller
Note:
The indoor units can be connected
to any of the 5 connectors (5-branch
type) or 3 connectors (3-branch type)
of the branch box.
[2] Standard systems
2-1 Only 3-branch type 2-2 Only 5-branch type 2-3 2-branch boxes (3-branch type)
OC
BC
A B C
IC
R
C
IC
R
C
IC
R
C
OC
BC
A B C D E
IC
R
C
IC
R
C
IC
R
C
ICIC
R
C
R
C
OC
BC
A B C
IC
R
C
IC
R
C
IC
BC
A B C
IC
R
C
IC
R
C
IC
R
C
R
C
(3-branch type)
(5-branch type) (3-branch type) (3-branch type)
BH79D391L03_EN.indd 11 7/17/2015 1:08:20 PM
12
7. Electrical work
NO
OC
BC
ABCDE
IC
R
C
IC
R
C
IC
R
C
IC
R
C
IC
R
C
IC
R
C
(5-branch type)
3-3. Connection of indoor units of CITY MULTI series.
OC
BC
ABCDE
IC
R
C
IC
R
C
IC
R
C
IC
R
C
IC
R
C
BC
ABCDE
IC
R
C
IC
R
C
IC
R
C
IC
R
C
IC
R
C
NO
2-4. 2 branch boxes (5-branch type, maximum 8 indoor units)
1. Up to 2 branch boxes can be connected to a single outdoor unit.
2. Up to 8 indoor units can be connected to the system.
[3] Incorrect systems
CO
BC
A B C
IC
RC
IC IC
R
C
NO
COCO
BC
A B C
IC
RC
BC
A B C
IC IC
R
C
NO
3-1. Group operation by single
remote controller
3-2. Group operation between different refrigerant
systems
3-1. Plural indoor units cannot be operated by a single remote controller.
3-2. Different refrigerant systems cannot be connected together.
3-3. Indoor units of CITY MULTI series cannot be connected to the branch boxes or
outdoor unit.
3-4. If an MA remote controller is connected to this system, an M-NET remote
controller cannot be connected.
(5-branch type) (5-branch type)
(3-branch type) (3-branch type) (3-branch type)
NO
OC
BC
ABCDE
IC
R
C
IC
R
C
IC
R
C
IC
R
C
IC
R
C
M-NET
RC
3-4. Connection of M-NET Remote controller
(5-branch type)
* CITY
MULTI
BH79D391L03_EN.indd 12 7/17/2015 1:08:20 PM
13
7. Electrical work
7.5. Wiring of main power supply and equipment capacity
Schematic Drawing of Wiring (Example) (Fig. 7-3)
A Switch (Breakers for Wiring and Current Leakage)
B Outdoor Unit
C Branch Box
D Indoor Unit
Fig. 7-3
TB7
TB3
(51)
L
3
L1
OC
TB7
(53)
OC
DC24V
Power Supply
Unit
System
controller
L
4
L5
M1 M2
S
M1 M2
S
S
M1 M2
S
TB3
M1 M2
S
M1 M2
S
M1 M2
TB3A
IC
(01)
IC
(02)
IC
(03)
IC
(04)
IC
MA
MA
MA
MA
RC
RC
(05)
IC
(06)
S1
S2
S3
TB3A
S1
S2
TB15
1
2
A
B
A
B
A
B
A
B
TB15
1
2
TB15
1
2
TB15
1
2
S3
TB3A
S1
S2
S3
TB3A
S1
S2
S3
TB3A
S1
S2
S3
TB3A
S1
S2
S3
TB3A
S1
S2
S3
TB3B
S1
S2
S3
TB3C
S1
S2
S3
TB3D
S1
S2
S3
TB3E
S1
S2
S3
TB3A
S1
S2
S3
TB3B
S1
S2
S3
TB3C
S1
S2
S3
M1
M2
S
TB5
M1
M2
S
TB5
L
(01)
(06)
2
Branch Box
A
A
Branch Box
Fig. 7-2
L/N
S1/S2/S3
S1/S2/S3
S1/S2/S3
L/N
S1/S2/S3
S1/S2/S3
S1/S2/S3
D
D
D
D
C
C
A
D
B1/B2
S1/S2/S3
S1/S2/S3
S1/S2/S3
L/N
L/N
S1/S2/S3
S1/S2/S3
S1/S2/S3
L/N
D
D
D
D
D
C
C
B
A
~/N 230 V, 50 Hz
L/N
A
B
<When Power Is Supplied Separately>
~/N 230 V, 50 Hz
~/N 230 V, 50 Hz
<When Power Is Supplied from the Outdoor Unit>
IMPORTANT
Make sure that the current leakage breaker is one compatible with higher
harmonics.
Always use a current leakage breaker that is compatible with higher harmon-
ics as this unit is equipped with an inverter.
The use of an inadequate breaker can cause the incorrect operation of inverter.
Longest length via outdoor units:
L
1
+ L
2
+ L
3
+ L
4
+ L
5
500 m (1.25 mm
2
or more)
Longest transmission cable length
L
1
+ L
2
, L
3
, L
3
+ L
4
, L
5
200 m (1.25 mm
2
or more)
A : Shielded wire
( ) : Address example
7.4. Branch box/outdoor wire connection and outdoor power supply cord connection (Fig. 7-2)
Warning:
• Be sure to attach the terminal block covers/panel of the outdoor unit securely. If it is not attached correctly, it could result in a re or an electric shock due to
dust, water, etc.
• Be sure to connect the power supply cords and the connecting wires for the indoor units, outdoor units, and branch boxes directly to the units (no intermediate
connections).
Intermediate connections can lead to communication errors if water enters the cords or wires and causes insufcient insulation to ground or a poor electrical
contact at the intermediate connection point.
(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cords and wires.)
Caution:
• Be careful not to make mis-wiring.
• Firmly tighten the terminal screws to prevent them from loosening.
• After tightening, pull the wires lightly to conrm that they not move.
• If the connecting wire is incorrectly connected to the terminal block, the unit does not operate normally.
• Connect wire from the branch box correctly to the terminal block.
• For future servicing, give extra length to connecting wire.
Terminal
block
Loosen terminal screw.
Lead wire
Connection details
NO
OC
BC
ABCDE
IC
R
C
IC
R
C
IC
R
C
IC
R
C
IC
R
C
IC
R
C
BH79D391L03_EN.indd 13 7/17/2015 1:08:20 PM
14
7. Electrical work
Thickness of Wire for Main Power Supply and On/Off Capacities
Model
Power Supply
Minimum Wire Thickness (mm
2
)
Breaker for
Wiring*1
Breaker for Current Leakage
Main Cable Ground
Outdoor Unit ~/N 230 V, 50 Hz
Indoor Unit
Power
When power is supplied
separately
5.5 (6) 5.5 (6) 32 A 32 A 30 mA 0.1 sec. or less
When power is supplied
from the outdoor unit
5.5 (6) 5.5 (6) 40 A 40 A 30 mA 0.1 sec. or less
Indoor Unit ~/N 230 V, 50 Hz Refer to installation manual of indoor unit.
*1. A breaker with at least 3.0 mm contact separation in each poles shall be provided. Use non-fuse breaker (NF) or earth leakage breaker (NV).
Total operating current of the indoor unit
Minimum wire thickness (mm²) Local switch (A)
Breaker for
wiring (NFB)
Ground-fault interrupter *1
Main cable Branch Ground Capacity Fuse
F0 = 16 A or less *2 1.5 1.5 1.5 16 16 20 20 A current sensitivity *3
F0 = 25 A or less *2 2.5 2.5 2.5 25 25 30 30 A current sensitivity *3
F0 = 32 A or less *2 4.0 4.0 4.0 32 32 40 40 A current sensitivity *3
Apply to IEC61000-3-3 about max. permissive system impedance.
*1 The Ground-fault interrupter should support inverter circuit.
The Ground-fault interrupter should combine using of local switch or wiring breaker.
*2 Please take the larger of F1 or F2 as the value for F0.
F1 = Total operating maximum current of the indoor units × 1.2
F2 = (V1/C)
Connect to Branch box (PAC-MK·BC)
Indoor unit V1 V2
Type 1 SEZ-KD·VAQ(L), PCA-RP·KAQ, PLA-RP·BA 19.8
2.4
Type 2 PEAD-RP·JAA 26.9
Type 3 SLZ-KA·VAQ(L) 9.9
Type 4 MSZ-FH·VE, MSZ-EF·VE, MSZ-GE·VAD 6.8
Type 5 MFZ-KJ·VE 7.4
Type 6 Branch box (PAC-MK·BC) 5.1 3.0
C : Multiple of tripping current at tripping time 0.01 s
Please pick up "C" from the tripping characteristic of the breaker.
*Condition: Branch Box + SEZ-KD·VA × 4 + SLZ-KA·VAQ(L), C=8 (refer to right sample chart)
F2 = 5.1 × 1/8 + 19.8 × 4/8 + 9.9 × 1/8
= 11.8
*3 Current sensitivity is calculated using the following formula.
G1 = V2 + V3 × (Wire length [km])
G1 Current sensitivity
30 or less 30 mA 0.1 sec or less
100 or less 100 mA 0.1 sec or less
Wire thickness (mm
2
) V3
1.5 48
2.5 56
4.0 66
Sample chart
1 2 3 4 6 8 10 20
C
6000
600
60
10
1
0.1
0.01
SAMPLE
Tripping Time [s]
Rated Tripping current (x)
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15
Caution:
After using the isolator, be sure to turn off and on the main power supply to reset the system. Otherwise, the outdoor unit may not be able to detect the branch
box(es) or indoor units.
Be sure to connect the outdoor-branch box/indoor-branch box connecting cables directly to the units (no intermediate connections).
Intermediate connections can lead to communication errors if water enters the cables and causes insufcient insulation to ground or a poor electrical contact at the intermediate connection point.
(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cables.)
Never splice the power cable or the indoor-outdoor connection cable, otherwise it may result in a smoke, a re or communication failure.
Notes: 1. Wiring size must comply with the applicable local and national code.
2. Power supply cords and indoor unit/branch box/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed exible cord. (Design
60245 IEC 57)
3. Install an earth line longer than power cables.
4. Do not bundle the M-NET cable with the connection cable and power supply cable.
It may cause erroneous operation.
B1
B2
L
N
Outdoor unit
2 poles isolator (Switch)
Branch box
7. Electrical work
Warning:
• If the power for the branch box is supplied from the terminal bed (TB1B)
of the outdoor unit, please turn off the main power supply when ser-
vicing. And do not touch the B1, B2 terminals when the power is en-
ergized. If isolator should be used between outdoor unit and branch
box/indoor unit and branch box, please use 3-pole type or 2-pole type.
(Please refer to gure below.)
• Turn on the main power when the ambient temperature is -20°C or higher.
• Under conditions of -20°C, it needs at least 4hr stand by before the units
operate in order to warm the electrical parts.
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16
7. Electrical work
7.7. Address setting
Switch address setting
Unit
Address
Outdoor
Branch Box
Indoor
Address Connection Setting
Switch
Port A B C D E –
ON
OFF 1 2 3 4 5 6
*
None
ON: Indoor connect
OFF: No connection
tens
digit
ones
digit
tens
digit
ones
digit
SWU2 SWU1 SW12 SW11 SW1 *SW1-6 not use
range 51 - 100 1 - 50 – –
setting
Branch address +
50
• According to the set address (for example, 01), the ad-
dresses for the connected indoor units are set sequentially
(for example, 02, 03, 04, and 05).
• Specify whether indoor units are connected to each
port (A, B, C, D, and E).
There are no ad-
dress settings for
the indoor units.
SW1 1 2 3 4 5
ON ON ON ON ON
Port A B C D E
Address 01 (SW11, 12)
02 03 04 05 (sequential numbers)
SW1 1 2 3 4 5 (6)
Port A B C D E (not use)
Indoor units are connected ON
Indoor units are not connected OFF
Note: 1. Branch box address
When setting the address, use a number within the range 1–50.
Ex. The set address is (47) and there are 5 indoor units (A, B, C, D, and E).
If A: (47), B: (48), C: (49), D: (50), and E: (51), E is incorrect because it exceeds 50.
Ex1. Outdoor + Branch <1> (Indoor A, B, C, D, E) + Branch <2> (Indoor A)
Outdoor
address
(51) *1
*1 Outdoor address
Branch Box <1> start address + 50 = 01 + 50 = 51
*2 Branch Box <1>
A-port address = Start address = 01
B-port address = Start address + 1 = 02
C-port address = Start address + 2 = 03
D-port address = Start address + 3 = 04
E-port address = Start address + 4 = 05
*3 Branch-Box <2>
Branch Box <2> start address
= Branch Box <1> oldest start address + 1
= 05 + 1 = 06
A-port address = Start address = 06
Ex2. Outdoor + Branch <1> (Indoor A, C, E) + Branch <2> (Indoor A, C, E)
Outdoor
address
(51) *1
*1 Outdoor address
Branch Box <1> start address + 50 = 01 + 50 = 51
*2 Branch-Box <1>
A-port address = Start address = 01
B-port address no connection
C-port address = Start address + 1 = 02
D-port address no connection
E-port address = Start address + 2 = 03
*3 Branch-Box <2>
Branch Box <2> start address
= Branch Box <1> oldest start address + 1
= 03 + 1 = 04
A-port address = Start address = 04
B-port address no connection
C-port address = Start address + 1 = 05
D-port address no connection
E-port address = Start address + 2 = 06
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor
(01) = A-port
(02) = B-port
(03) = C-port
(04) = D-port
(05) = E-port
(06) = A-port
(01) = A-port
non B-port
(02) = C-port
non D-port
(03) = E-port
(04) = A-port
non B-port
(05) = C-port
non D-port
(06) = E-port
Branch-Box <1>
address (01) *
2
SW1 1, 3, 5 ON
SW1 2, 4 OFF
Branch-Box <2>
address (04) *
3
SW1 1, 3, 5 ON
SW1 2, 4 OFF
Branch-Box <2>
address (06) *
3
SW1 1 ON
SW1 2, 3, 4, 5 OFF
Branch-Box <1>
address (01) *
2
SW1 1, 2, 3, 4, 5 ON
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17
8. Test run
8.1. Before test run
► After completing installation and the wiring and piping of the indoor and
outdoor units, check for refrigerant leakage, looseness in the power sup-
ply or control wiring, wrong polarity, and no disconnection of one phase
in the supply.
► Use a 500-volt M-ohm tester to check that the resistance between the
power supply terminals and ground is at least 1 MΩ.
► Do not carry out this test on the control wiring (low voltage circuit) termi-
nals.
Warning:
Do not use the air conditioner if the insulation resistance is less than 1 MΩ.
Insulation resistance
After installation or after the power source to the unit has been cut for an extended
period, the insulation resistance will drop below 1 MΩ due to refrigerant accumulat-
ing in the compressor. This is not a malfunction. Perform the following procedures.
1. Remove the wires from the compressor and measure the insulation resistance
of the compressor.
2. If the insulation resistance is below 1 MΩ, the compressor is faulty or the resist-
ance dropped due the accumulation of refrigerant in the compressor.
3. After connecting the wires to the compressor, the compressor will start to warm
up after power is supplied. After supplying power for the times indicated below,
measure the insulation resistance again.
• The insulation resistance drops due to accumulation of refrigerant in the
compressor. The resistance will rise above 1 MΩ after the compressor is
warmed up for 12 hours.
(The time necessary to warm up the compressor varies according to atmos-
pheric conditions and refrigerant accumulation.)
• To operate the compressor with refrigerant accumulated in the compressor,
the compressor must be warmed up at least 12 hours to prevent breakdown.
4. If the insulation resistance rises above 1 MΩ, the compressor is not faulty.
Caution:
• The compressor will not operate unless the power supply phase connec-
tion is correct.
• Turn on the power at least 12 hours 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.
► The followings must be checked as well.
• The outdoor unit is not faulty. LED on the control board of the outdoor unit ash
when the outdoor unit is faulty.
• Both the gas and liquid stop valves are completely open.
8.3. Refrigerant collecting (Pump down)
Perform the following procedures to collect the refrigerant when moving the indoor
unit or the outdoor unit.
1 Turn off the circuit breaker.
2 Connect the low pressure side of the gauge manifold to the service port of the
gas side stop valve.
3 Close the liquid stop value.
4 Supply power (circuit breaker).
* Start-up of the indoor-outdoor communication takes about 3 minutes after the
power (circuit breaker) is turned on. Start the pump-down operation 3 to 4
minutes after the power (circuit breaker) is turned ON.
5 Conrm that SW3-2 is set to OFF, and then set SW3-1 to ON to perform the
test run for cooling operation. The compressor (outdoor unit) and ventilators
(indoor and outdoor units) start operating and test run for cooling operation
begins. Immediately after performing the test run for cooling operation, set the
outdoor service switch SW2-4 (pump down switch) from OFF to ON.
* Do not continue to operate for a long time with the switch SW2-4 set to ON.
Make sure to switch it to OFF after pump down is completed.
6 Fully close the gas stop valve when the pressure reading on the gauge drops
0.05 - 0.00 MPa (approximately 0.5 - 0.0 kgf/cm
2
)
7 Set SW3-1 to OFF to stop the air conditioner operation. (Set the outdoor ser-
vice switch SW2-4 from ON to OFF.)
8 Turn off the power supply (circuit breaker).
* If too much refrigerant has been added to the air conditioner system, the
pressure may not drop to 0.05 MPa (0.5 kgf/cm
2
). If this occurs, use a refriger-
ant collecting device to collect all of the refrigerant in the system, and then
recharge the system with the correct amount of refrigerant after the indoor and
outdoor units have been relocated.
Warning:
When pumping down the refrigerant, stop the compressor before discon-
necting the refrigerant pipes. The compressor may burst and cause injury if
any foreign substance, such as air, enters the system.
8.2. Test run
8.2.1. Using remote controller
Refer to the indoor unit installation manual.
• Be sure to perform the test run for each indoor unit. Make sure each indoor
unit operates properly following the installation manual attached to the unit.
• If you perform the test run for all indoor units at once, you cannot detect
any erroneous connection, if any, of the refrigerant pipes and the connect-
ing wires.
* The compressor operation is not available for 3 minutes at least after the
power is supplied.
• The compressor can emit noise just after turn on the power supply or in
case of low outside air temperature.
About the restart protective mechanism
Once the compressor stops, the restart preventive device operates so the com-
pressor will not operate for 3 minutes to protect the air conditioner.
8.2.2. Using SW3 in outdoor unit
Note:
In case of the test run from outdoor unit, all indoor units operate. Therefore,
you can not detect any erroneous connection of refrigerant pipes and the
connecting wires. If it aims at detection of any erroneous connection, be sure
to carry out the test run from remote controller with reference to “8.2.1 Using
remote controller.”
SW3-1 ON
Cooling operation
SW3-2 OFF
SW3-1 ON
Heating operation
SW3-2 ON
* After performing the test run, set SW3-1 to OFF.
• A few seconds after the compressor starts, a clanging noise may be heard from
the inside of the outdoor unit. The noise is coming from the check valve due to
the small difference in pressure in the pipes. The unit is not faulty.
The test run operation mode cannot be changed by DIP switch SW3-2 during
the test run. (To change the test run operation mode during the test run,
stop the test run by DIP switch SW3-1. After changing the test run operation
mode, resume the test run by switch SW3-1.)
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18
9. Special Functions
A Distant control board
B Relay circuit
C External output adapter (PAC-SA88HA-E)
D Outdoor unit control board
E Lamp power supply
F Procure locally
G Max. 10 m
L1: Error display lamp
L2: Compressor operation lamp
X, Y: Relay (Coil standard of 0.9W or less for DC 12V)
X, Y: Relay (DC1mA)
The wiring between B and C is completed before shipping from the factory.
The silent mode and the demand control are selected by switching the DIP switch 9-2 on outdoor controller board.
It is possible to set it to the following power consumption (compared with ratings) by setting SW1, 2.
Outdoor controller board DIP SW9-2 SW1 SW2 Function
Silent mode OFF ON – Silent mode operation
Demand control ON OFF OFF 100 % (Normal)
ON OFF 75 %
ON ON 50 %
OFF ON 0 % (Stop)
This product is capable of all three Demand Response Mode (DRM1, 2, 3). (DRED compliant to AS/NZS 4755.3.1:2012)
Demand Response Mode Description
DRM1 Compressor Off.
DRM2 Total electrical energy consumption of the system is not more than 50%.
DRM3 Total electrical energy consumption of the system is not more than 75%.
A Remote control panel
B Relay circuit
C External input adapter (PAC-SC36NA-E)
D Outdoor unit control board
E Relay power supply
F Procure locally
G Max. 10 m
CN51
X
5
4
3
A C
D
5
E
1
B
G
Y
F
~
Y
X
L1
L2
1
3
A C
D
E
B
G
F
CN3D
X
Y
SW1
SW2
1
2
3
~
Y
X
9.1. OUTDOOR UNIT INPUT/OUTPUT CONNECTOR
• State (CN51)
• Silent Mode / Demand Control (CN3D)
• Demand Response Mode (CN3S, CN3D)
CN3D
CN3S
1
3
1
3
RED
BRN
YLW
WHT
1
2
3
C
Common
DRM3
DRM2
DRM1
A
C
B
A DRED (Demand controller)
B Terminal bed
C Outdoor unit control board
To use this function, DIP switch SW5-1 must be set to OFF and the existing CN3S and CN3D lead wires must be removed. In addition, this function cannot be used at the
same time as the Demand Response Modes above.
Input:12 V DC, 1mA
A Remote control panel
B Relay circuit
C External input adapter (PAC-SC36NA-E)
D Outdoor unit control board
E Relay power supply
F Procure locally
G Max. 10 m
ON OFF
SW1 Heating Cooling
SW2 Validity of SW1 Invalidity of SW1
1
3
A C
D
E
B
G
F
CN3N
X
Y
SW1
SW2
1
2
3
~
Y
X
• Auto change over (CN3N)
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Untitled-2 1 7/3/2015 2:55:41 PM
Please be sure to put the contact address/telephone number on
this manual before handing it to the customer.
This product is designed and intended for use in the residential,
commercial and light-industrial environment.
BH79D391L03 Printed in Japan
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
BH79D391L03_EN.indd 19 7/17/2015 1:08:21 PM
