Mitsubishi Electric CITY MULTI PURY-P-ZKMU-A User manual

Air-Conditioners For Building Application
OUTDOOR UNIT
PURY-P-ZKMU-A(-BS) For use with R410A
INSTALLATION MANUAL
For safe and correct use, please read this installation manual thoroughly before installing the air-conditioner unit.
MANUEL D’INSTALLATION
Veuillez lire le manuel d’installation en entier avant d’installer ce climatiseur pour éviter tout accident et vous assurer d’une utilisation correcte.
<ORIGINAL>
GB
F

CONTENTS
1. Safety precautions········································································································2
1-1. General precautions...............................................................................................................2
1-2. Precautions for transporting the unit......................................................................................3
1-3. Precautions for unit installation..............................................................................................3
1-4. Precautions for piping work....................................................................................................4
1-5. Precautions for electrical wiring.............................................................................................4
1-6. Precautions for relocating or repairing the unit......................................................................5
1-7. Additional precautions............................................................................................................5
2. About the product·········································································································7
3. Combination of outdoor units ························································································7
4. Specifications ··············································································································8
5. Package contents ·········································································································8
6. Transporting the unit·····································································································9
7. Installation location ····································································································10
7-1. Single unit installation..........................................................................................................10
7-2. Multiple unit installation........................................................................................................11
8. Foundation work ········································································································12
9. Refrigerant piping work·······························································································13
9-1. Restrictions..........................................................................................................................13
9-2. Pipe selection.......................................................................................................................14
9-3. Twinning kit selection...........................................................................................................14
9-4. Pipe connection example.....................................................................................................15
9-5. Piping connections and valve operations ............................................................................17
9-6. Air-tightness test ..................................................................................................................21
9-7. Thermal insulation for pipes.................................................................................................21
9-8. Evacuation of the system.....................................................................................................23
9-9. Additional refrigerant charge................................................................................................24
10. Electrical work··········································································································28
10-1. Before electrical work.........................................................................................................28
10-2. Power cables and device capacity.....................................................................................28
10-3. Control cable specifications...............................................................................................29
10-4. System configuration .........................................................................................................30
10-5. Wiring connections in the control box................................................................................32
10-6. Address setting ..................................................................................................................34
11. Test run····················································································································35
11-1. Before a test run.................................................................................................................35
11-2. Function setting..................................................................................................................35
11-3. Operation characteristics in relation to the refrigerant charge ...........................................36
11-4. Operation check.................................................................................................................36
12. Inspection and maintenance·······················································································36
13. Rating plate information ····························································································37
GB
GB-1
WT07828X01

1. Safety precautions
ŹRead and observe the safety precautions below and the instructions provided on the labels affixed to the
unit.
ŹRetain this manual for future reference. Make sure that this manual is passed on to the end users.
ŹAll refrigerant piping work, electrical work, air-tightness test, and brazing work must be performed by
qualified personnel.
ŹIncorrect use may result in serious injury.
: indicates a hazardous situation which, if not avoided, could result in death or
serious injury.
: indicates a hazardous situation which, if not avoided, could result in minor or
moderate injury.
: addresses practices not related to personal injury, such as product and/or
property damage.
1-1. General precautions
Do not use any refrigerant other than the type indicated in the manuals for the unit and on the nameplate.
- Doing so will cause the unit or pipes to burst, or result in an explosion or fire during use, during repairs, or at the
time of disposal of the unit.
- It may also be in violation of applicable laws.
- MITSUBISHI ELECTRIC CORPORATION cannot be held responsible for malfunctions or accidents resulting from
the use of the wrong type of refrigerant.
Do not use the unit in an unusual environment.
- If the unit is used in areas exposed to large amounts of oil, steam, organic solvents, or corrosive gases (such as
ammonia, sulfuric compounds, or acids), or areas where acidic/alkaline solutions or special chemical sprays are
used frequently, it may significantly reduce the performance and corrode the internal parts, resulting in refrigerant
leakage, water leakage, injury, electric shock, malfunction, smoke, or fire.
Do not change the settings of the safety or protection devices.
- Forcing the unit to operate by disabling the safety devices, such as the pressure switch or the thermal switch, may
result in bursting, fire, or explosion.
- Operating the unit with a safety device whose settings have been changed may result in bursting, fire, or explosion.
- Using safety devices other than those specified by Mitsubishi Electric may result in bursting, fire, or explosion.
Do not alter or modify the unit.
- Doing so will result in refrigerant leakage, water leakage, serious injury, electric shock, or fire.
Do not wet the electrical parts.
- Doing so may result in current leakage, electric shock, malfunction, or fire.
Do not touch the electrical parts, switches, or buttons with wet fingers.
- Doing so may result in electric shock, malfunction, or fire.
Do not touch the refrigerant pipes and refrigerant line components with bare hands during and immediately
after operation.
- The refrigerant in the pipes will be very hot or very cold, resulting in frostbite or burns.
Do not touch the electrical parts with bare hands during and immediately after operation.
- Doing so may result in burns.
Ventilate the room while servicing the unit.
- If the refrigerant leaks, oxygen deficiency may result. If the leaked refrigerant comes in contact with a heat source,
toxic gas will be generated.
GB-2
WT07828X01

If you notice any abnormality (e.g., a burning smell), stop the operation, turn off the power switch, and
consult your dealer.
- Continuing the operation may result in electric shock, malfunction, or fire.
Properly install all required covers and panels on the terminal box and the control box.
- If dust or water enters the unit, this may result in electric shock or fire.
Periodically check the unit base for damage.
- If the damage is left uncorrected, the unit will fall and cause serious injury.
Consult your dealer for the proper disposal of the unit.
- The refrigerant oil and the refrigerant in the unit will pose a risk of environmental pollution, fire, or explosion.
Children should be supervised to ensure that they do not play with the appliance.
Do not operate the unit with the panels and guards removed.
- Rotating, hot, or high-voltage parts may cause injury, electric shock, or fire.
Do not touch fans, heat exchanger fins, or the sharp edges of components with bare hands.
- Doing so may result in injury.
Wear protective gloves when working on the unit.
- Failure to do so may result in injury.
1-2. Precautions for transporting the unit
When lifting the unit, pass the slings through the four designated sling holes.
- Improper lifting will cause the unit to topple or fall, resulting in serious injury.
Do not lift the unit with the PP bands that are used on some products.
- Doing so may result in injury.
Observe the restrictions on the maximum weight that a person can lift, which is specified in local regulations.
- Failure to do so may result in injury.
1-3. Precautions for unit installation
Do not install the unit where combustible gas may leak.
- If combustible gas accumulates around the unit, fire or explosion may result.
Do not allow children to play with the packing materials.
- Suffocation or serious injury may result.
Cut up the packing materials before disposal.
All installation work must be performed by qualified personnel in accordance with this manual.
- Improper installation may result in refrigerant leakage, water leakage, serious injury, electric shock, or fire.
If the air conditioner is installed in a small room, take measures to prevent the refrigerant concentration from
exceeding the safety limit in the event of refrigerant leakage.
- Consult your dealer regarding the appropriate measures to prevent the allowable concentration from being
exceeded. If the refrigerant leaks and the allowable concentration is exceeded, hazards due to a lack of oxygen in
the room will result.
GB
GB-3
WT07828X01

Install the unit in accordance with the instructions to minimize the risk of damage from earthquakes and
strong winds.
- Improper installation will cause the unit to topple, resulting in serious injury.
The unit must be securely installed on a structure that can sustain its weight.
- Failure to do so will cause the unit to fall, resulting in serious injury.
Seal all openings around pipes and wires to keep out small animals, rainwater, or snow.
- Failure to do so may result in current leakage, electric shock, or damage to the unit.
1-4. Precautions for piping work
Before heating the brazed sections, remove the gas and oil that are trapped in the pipes.
- Failure to do so may generate fire, resulting in serious injury.
Do not purge the air using refrigerant. Use a vacuum pump to evacuate the system.
- Residual gas in the refrigerant lines will cause bursting of the pipes or an explosion.
Do not use oxygen, flammable gas, or a refrigerant containing chlorine for air-tightness testing.
- Doing so may result in an explosion. Chlorine will deteriorate the refrigerant oil.
When installing or relocating the unit, do not allow air or any substance other than the specified refrigerant
to enter the refrigerant lines.
- Any substance other than the specified refrigerant may cause abnormally high pressure in the refrigerant lines,
resulting in bursting of the pipes or an explosion.
After the installation has been completed, check for refrigerant leaks.
- If the refrigerant leaks, oxygen starvation may result. If the leaked refrigerant comes in contact with a heat source,
toxic gas will be generated.
1-5. Precautions for electrical wiring
Include some slack in the power cables.
- Failure to do so may break or overheat the cables, resulting in smoke or fire.
Connections must be made securely and without tension on the terminals.
- Improperly connected cables may break, overheat, or cause smoke or fire.
Tighten all terminal screws to the specified torque.
- Loose screws and contact failure may result in smoke or fire.
Electrical work must be performed by qualified personnel in accordance with local regulations and the
instructions provided in this manual. Only use the specified cables and dedicated circuits.
- Inadequate power source capacity or improper electrical work will result in electric shock, malfunction, or fire.
Install an inverter circuit breaker on the power supply of each unit.
- Failure to do so may result in electric shock or fire.
Only use properly rated breakers (an earth leakage breaker, local switch <a switch + fuse that meets local
electrical codes>, or overcurrent breaker).
- Failure to do so may result in electric shock, malfunction, smoke, or fire.
Only use standard power cables of sufficient capacity.
- Failure to do so may result in current leakage, overheating, smoke, or fire.
Proper grounding must be provided by qualified personnel.
- Improper grounding may result in electric shock, fire, explosion, or malfunction due to electrical noise. Do not
connect the ground wire to gas or water pipes, lightning rods, or telephone ground wires.
GB-4
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After the wiring work has been completed, measure the insulation resistance, and make sure that it reads at
OHDVW0ȍ
- Failure to do so may result in electric leakage, malfunction, or fire.
1-6. Precautions for relocating or repairing the unit
Only qualified personnel must relocate or repair the unit. Do not attempt to disassemble or alter the unit.
- Failure to do so will result in refrigerant leakage, water leakage, serious injury, electric shock, or fire.
Do not service the unit in the rain.
- Doing so may result in electric leakage, electric shock, wire shorting, malfunction, smoke, or fire.
1-7. Additional precautions
Do not turn off the power immediately after stopping operation.
- Wait for at least five minutes after the unit has stopped before turning off the power. Failure to do so may result in
drain water leakage or the mechanical failure of sensitive parts.
The unit must be periodically inspected by a dealer or qualified personnel.
- If dust or dirt accumulates inside the unit, the drain pipes may become clogged, and water leakage from the pipes
may wet the surroundings and generate odours.
Turn on the power at least 12 hours before starting operation. Keep the power turned on throughout the
operating season.
- Insufficient energizing will result in malfunction.
Do not use the air conditioner for special purposes (e.g. keeping food, animals, plants, precision devices, or
art objects in a room).
- Such items could be damaged or deteriorated.
Collect the refrigerant and properly dispose of it in accordance with local regulations.
Do not install the unit on or over items that are subject to water damage.
- When the room humidity exceeds 80% or if the drain pipe is clogged, condensation may collect and drip from the
indoor unit onto the ceiling or floor.
Drain piping must be installed by a dealer or qualified personnel to ensure proper drainage.
- Improper drain piping may cause water leakage, resulting in damage to furniture and other surroundings.
Take appropriate measures against electrical noise interference when installing the unit in hospitals or radio
communication facilities.
- Inverter, high-frequency medical, or wireless communication equipment as well as power generators may cause the
air conditioning system to malfunction. The air conditioning system may also adversely affect the operation of these
types of equipment by creating electrical noise.
Insulate pipes to prevent condensation.
- Condensation may collect and drip from the unit onto the ceiling or floor.
Keep the service valves closed until refrigerant charging is completed.
- Failure to do so will damage the unit.
Place a wet towel on the service valves before brazing the pipes to keep the temperature of the valves from
rising above 120ºC (248ºF).
- Failure to do so may result in equipment damage.
Keep the flame out of contact with the cables and metal sheet when brazing the pipes.
- Failure to do so may result in burnout or malfunction.
GB
GB-5
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Use the following tools specifically designed for use with the specified refrigerant: Gauge manifold, charge
hose, gas leak detector, check valve, refrigerant charge base, vacuum gauge, and refrigerant recovery
equipment.
- Gas leak detectors for conventional refrigerants will not react to a refrigerant that does not contain chlorine.
- If the specified refrigerant is mixed with water, refrigerant oil, or another refrigerant, the refrigerant oil will deteriorate
and the compressor will malfunction.
Use a vacuum pump with a check valve.
- If the vacuum pump oil flows back into the refrigerant lines, the refrigerant oil may deteriorate and the compressor
may malfunction.
Keep tools clean.
- If dust, dirt, or water accumulates on the charging hose or the flare processing tool, the refrigerant will deteriorate
and the compressor will malfunction.
Use refrigerant piping made of phosphorus deoxidized copper (copper and copper alloy seamless pipes) that
meets local requirements. Pipe joints should also meet local requirements. Keep the inner and outer surfaces
of the pipes clean and free of sulphur, oxides, dust/dirt, shaving particles, oils, moisture, or any other
contaminants.
- Contaminants on the inside of the refrigerant piping will cause the refrigerant oil to deteriorate and cause the
compressor to malfunction.
Store pipes indoors, and keep both ends of the pipes sealed until just before making a flare connection or
brazing. (Store elbows and other joints in plastic bags.)
- If dust, dirt, or water enters the refrigerant lines, the refrigerant oil will deteriorate and the compressor will
malfunction.
Braze the pipes with a nitrogen purge to avoid oxidation.
- Oxidized flux inside the refrigerant pipes will cause the refrigerant oil to deteriorate and cause the compressor to
malfunction.
Do not use existing refrigerant piping.
- The old refrigerant and refrigerant oil in the existing piping contain a large amount of chlorine, which will cause the
refrigerant oil in the new unit to deteriorate and cause the compressor to malfunction.
Charge refrigerant in a liquid state.
- Charging refrigerant in the gaseous state will change the composition of the refrigerant and lead to a performance
drop.
Do not use a charging cylinder when charging refrigerant.
- The use of a charging cylinder may change the composition of the refrigerant and lead to a performance drop.
If a large electric current flows due to a malfunction or faulty wiring, earth-leakage breakers on the unit side
and on the upstream side of the power supply system could both operate. Depending on the importance of
the system, separate the power supply system or take protective coordination of breakers.
This appliance is intended to be used by expert or trained users in shops, in light industry and on farms, or
for commercial use by lay persons.
This appliance is not intended for use by persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge, unless they have been given supervision or
instruction concerning use of the appliance by a person responsible for their safety.
GB-6
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GB
GB-7
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2. About the product
・The outdoor unit described in this manual is air-conditioning equipment that is designed only for human comfort.
・The numeric values in the unit model name (e.g., PURY-P***ZKMU-A(-BS)) indicate the capacity index of the unit.
・This unit uses R410A refrigerant.
3. Combination of outdoor units
Outdoor unit model Combination of outdoor units
PURY-P72ZKMU-A(-BS) - -
PURY-P96ZKMU-A(-BS) - -
PURY-P120ZKMU-A(-BS) - -
PURY-P144ZKMU-A(-BS) - -
PURY-P168ZSKMU-A(-BS) PURY-P96ZKMU-A(-BS) PURY-P72ZKMU-A(-BS)
PURY-P192ZSKMU-A(-BS) PURY-P96ZKMU-A(-BS) PURY-P96ZKMU-A(-BS)
PURY-P216ZSKMU-A(-BS) PURY-P120ZKMU-A(-BS) PURY-P96ZKMU-A(-BS)
PURY-P240ZSKMU-A(-BS) PURY-P120ZKMU-A(-BS) PURY-P120ZKMU-A(-BS)
PURY-P264ZSKMU-A(-BS) PURY-P144ZKMU-A(-BS) PURY-P120ZKMU-A(-BS)
PURY-P288ZSKMU-A(-BS) PURY-P144ZKMU-A(-BS) PURY-P144ZKMU-A(-BS)
* "Twinning Kit" is required to connect combination units on site.

GB-8
WT07828X01
4. Specifications
Model PURY-P72ZKMU-A PURY-P96ZKMU-A
Sound level (50/60 Hz) 58 dB <A> 58 dB <A>
External static pressure 0 Pa*2
Indoor unit Total capacity 50% to 150%*1 Model 06 to 96
Quantity R2 system 1 to 18 1 to 24
Temperature range
(Cooling) Indoor W.B. +15.0°C to +24.0°C (+59.0°F to +75.0°F)
Outdoor D.B. -5.0°C to +46.0°C (+23.0°F to +115.0°F)
Temperature range
(Heating) Indoor D.B. +15.0°C to +27.0°C (+59.0°F to +81.0°F)
Outdoor W.B. -20.0°C to +15.5°C (-4.0°F to +60.0°F)
Model PURY-P120ZKMU-A PURY-P144ZKMU-A PURY-P168ZSKMU-A PURY-P192ZSKMU-A
Sound level (50/60 Hz) 60 dB <A> 61 dB <A> 61 dB <A> 61 dB <A>
External static pressure 0 Pa*2
Indoor unit Total capacity 50% to 150%*1 Model 06 to 96
Quantity R2 system 1 to 30 1 to 36 1 to 42 1 to 48
Temperature range
(Cooling) Indoor W.B. +15.0°C to +24.0°C (+59.0°F to +75.0°F)
Outdoor D.B. -5.0°C to +46.0°C (+23.0°F to +115.0°F)
Temperature range
(Heating) Indoor D.B. +15.0°C to +27.0°C (+59.0°F to +81.0°F)
Outdoor W.B. -20.0°C to +15.5°C (-4.0°F to +60.0°F)
Model PURY-P216ZSKMU-A PURY-P240ZSKMU-A PURY-P264ZSKMU-A PURY-P288ZSKMU-A
Sound level (50/60 Hz) 62 dB <A> 63 dB <A> 63.5 dB <A> 64 dB <A>
External static pressure 0 Pa*2
Indoor unit Total capacity 50% to 150%*1 Model 06 to 96
Quantity R2 system 2 to 50 2 to 50 2 to 50 2 to 50
Temperature range
(Cooling) Indoor W.B. +15.0°C to +24.0°C (+59.0°F to +75.0°F)
Outdoor D.B. -5.0°C to +46.0°C (+23.0°F to +115.0°F)
Temperature range
(Heating) Indoor D.B. +15.0°C to +27.0°C (+59.0°F to +81.0°F)
Outdoor W.B. -20.0°C to +15.5°C (-4.0°F to +60.0°F)
*1 The maximum total capacity of indoor units operating simultaneously is 150%.
*2 To enable the high static pressure setting, set the dipswitch on the main board as follows.
SW6-4: ON
SW6-5: OFF (60 Pa) or ON (30 Pa)
5. Package contents
Band
Model
P72 2 pcs.
P96 2 pcs.
P120 2 pcs.
P144 2 pcs.

GB
GB-9
WT07828X01
6. Transporting the unit
When lifting the unit, pass the slings through the four designated sling holes.
- Improper lifting will cause the unit to topple or fall, resulting in serious injury.
・Always use two slings to lift up the unit. Each sling must be at least 8 m (26 ft) long and must be able to support the weight of the unit.
・Put protective pads between slings and the unit where the slings touch the unit at the base to protect the unit from being scratched.
・Put 50 mm (2 in) or thicker protective pads between slings and the unit where the slings touch the unit at the top of the unit to protect the unit from
being scratched and to avoid contact with the slings and the fan guard.
・Make sure that the angles between slings at the top are less than 40 degrees.
P72 P96
Ⓐ
Ⓑ
Ⓒ
Ⓔ
Ⓓ
Ⓐ
Ⓑ
Ⓒ
Ⓔ
Ⓓ
P120, P144
Ⓐ
Ⓑ
Ⓒ
Ⓔ
Ⓓ
ⒶSlings (Min. 8 m (26 ft) x 2)
ⒷProtective pads (Minimum thickness: 50 mm
(2 in))
(two each in the front and back)
ⒸProtective pads
(two each in the front and back)
ⒹSling holes
(two each in the front and back)
ⒺFan guard
 


GB-10
WT07828X01
7. Installation location
Do not install the unit where combustible gas may leak.
- If combustible gas accumulates around the unit, fire or explosion may result.
・Provide sufficient space around the unit for effective operation, efficient air movement, and ease of access for maintenance.
・Note that refrigerant gas is heavier than air and will therefore tend to collect in low spots such as basements.
・When an indoor unit that draws in outside air exits near the outdoor unit, be careful not to affect the normal operation of the indoor unit.
7-1. Single unit installation
(1) When all walls are within their height limits*.
L1
L2
L3
L3
[mm (in)]
* Height limit
Front/Right/Left Same height or lower than the overall height of the unit
Rear 500 mm (19-11/16 in) or lower from the unit bottom
Required minimum distance [mm (in)]
L1 (Front) L2 (Rear) L3 (Right/Left)
When the distance behind the unit (L2) needs to be small 450 (17-3/4) 100 (3-15/16) 50 (2)
When the distance to the right or left (L3) needs to be small 450 (17-3/4) 300 (11-13/16) 15 (5/8)
(2) When one or more walls exceed their height limits*.
When the wall(s) at the front and/or the
right/left exceed(s) their height limits When the wall at the rear exceeds its height limit When all walls exceed their height limits
h3
L1
L2
L3
L3
h1
L1
L2
L3
L3
h2
L1
h3 h2
L2
L3
L3
h1
Add the dimension that exceeds the height limit (shown as "h1" through "h3" in the figures) to L1, L2, and L3 as shown in the table below.
Required minimum distance [mm (in)]
L1 (Front) L2 (Rear) L3 (Right/Left)
When the distance behind the unit (L2) needs to be small 450 (17-3/4) + h1 100 (3-15/16) + h2 50 (2) + h3
When the distance to the right or left (L3) needs to be small 450 (17-3/4) + h1 300 (11-13/16) + h2 15 (5/8) + h3
(3) When there are overhead obstacles

8QLWKHLJKW
8QLWKHLJKW
Unit height
Unit height

(19-11/16)
8QLWKHLJKW
8QLWKHLJKW
500
(19-11/16)
Unit height
Unit height
500
(19-11/16)




Air outlet guide
(not supplied)

GB
GB-11
WT07828X01
7-2. Multiple unit installation
・When installing multiple units, make sure to take into consideration factors such as providing enough space for people to pass through, ample
space between blocks of units, and sufficient space for airflow. (The areas marked with Ⓐin the figures below must be left open.)
・In the same way as with the single unit installation, add the dimension that exceeds the height limit (shown as "h1" through "h3" in the figures) to
L1, L2, and L3 as shown in the tables below.
・If there are walls in the front and rear of the block of units, up to six units (three units for units P120 through P144) can be installed consecutively
side by side, and a space of 1000 mm (39-3/8 in) or more must be left between each block of six units.
(1) Side-by-side installation
When the distances between the units (L4) need to be small When the distance behind the block of units (L2) needs to be small
h2
L2
L1
h1
L4
Ⓐ
Ⓐ
h2
h1
L1
L2
L4
Ⓐ
Ⓐ
Required minimum distance [mm (in)]
L1 (Front) L2 (Rear) L4 (Between)
450 (17-3/4) + h1 300 (11-13/16) + h2 30 (1-3/16)
Required minimum distance [mm (in)]
L1 (Front) L2 (Rear) L4 (Between)
450 (17-3/4) + h1 100 (3-15/16) + h2 100 (3-15/16)
(2) Face-to-face installation
When there are walls in the front and rear of the block of units When there is a wall on either the right or left side of the block of units
h1
h2
L1
L4
L4
L2
Ⓐ
Ⓐ
h3
L4
L3
L4
Required minimum distance [mm (in)]
L1 (Front) L2 (Rear) L4 (Between)
450 (17-3/4) + h1 100 (3-15/16) + h2 450 (17-3/4)
Required minimum distance [mm (in)]
L3 (Right/Left) L4 (Between)
15 (5/8) + h3 450 (17-3/4)
(3) Combination of face-to-face and side-by-side installations
When there are walls in the front and rear of the block of units When there are two walls in an L-shape
h2
h2’
L2’
L4
L2
Ⓐ
Ⓐ
h2
h3
L2
L4
L3
Ⓐ
Ⓐ
Required minimum distance [mm (in)]
L2 (Right) L2' (Left) L4 (Between)
300 (11-13/16) + h2 300 (11-13/16) + h2' 900 (35-7/16)
Required minimum distance [mm (in)]
L2 (Right) L3 (Right/Left) L4 (Between)
300 (11-13/16) + h2 1000 (39-3/8) + h3 900 (35-7/16)
ⒶLeave open in two directions.
500 (19-11/16)
Unit height
500 (19-11/16)
Unit height
500 (19-11/16)
Unit height Unit height
500
(19-11/16)
500 (19-11/16)
500
(19-11/16)
Unit height

GB-12
WT07828X01
8. Foundation work
Install the unit in accordance with the instructions to minimize the risk of damage from earthquakes and strong winds.
- Improper installation will cause the unit to topple, resulting in serious injury.
The unit must be securely installed on a structure that can sustain its weight.
- Failure to do so will cause the unit to fall, resulting in serious injury.
・When performing the foundation work, make sure that the floor surface has sufficient strength and carefully route pipes and wires in consideration
of the water drainage that will be required when the unit is operated.
・If considering routing the pipes and wires across the bottom of the unit, make sure that the base is at least 100 mm (3-15/16 in) high so that the
through-holes will not be blocked.
・Provide a strong base of concrete or angle iron. If a stainless steel base is used, insulate the area between the base and the outdoor unit by
putting a rubber cushion or by applying an electrically insulated coating to prevent the base from rusting.
・Install the unit on a level surface.
・With some types of installation, unit vibration and sound will be transmitted to the floors and walls. In such locations, take measures to prevent
vibration (such as using anti-vibration rubber pads). [mm (in)]
Ⓐ
Ⓑ
Ⓒ
Ⓓ
ⒶM10 anchor bolt (not supplied)
Ⓑ(Incorrect installation) The corner section is not securely received.
ⒸFixing bracket for post-installed anchor bolts (not supplied) (To be fixed with three screws)
ⒹAnti-vibration rubber pad (The pad needs to be large enough to cover the entire width of each unit leg.)
ⒺDetachable leg
・Make sure that the corner section is securely received. If not, the unit legs could bend.
・The length of the projecting part of the anchor bolt should be 30 mm (1-3/16 in) or less.
・This unit is not designed to be anchored with post-installed anchor bolts unless fixing brackets are installed at the bottom four locations (six
locations for units P120 through P144).
・In abnormally harsh environments such as cold and/or windy areas, sufficient countermeasures to guard against excessive wind and snow should be
taken to ensure the unit’s correct operation. When the unit is expected to operate in cooling mode in conditions under 10°C (50°F), in snowy areas, in
environments subject to strong winds or rain, install snow hoods of the following specifications (not supplied) as shown in the figure below.
Material: Galvanized steel plate 1.2T
Painting: Overall painting with polyester powder
Color: Munsell 5Y8/1 (same as the unit color)
Size: Refer to the Data Book.
ⒹⒹ
Ⓐ
ⒷⒷ
Ⓑ
ⒸⒸ Ⓒ
ⒸⒸ ⒶOutlet
ⒷInlet
ⒸSnow hood
ⒹRaised base
・Install the unit so that the wind will not blow directly against the inlet and outlet.
・If necessary, install the unit on a raised base of the following specifications (not supplied) to prevent damage from snow.
Material: Angle iron (Build a structure that snow and wind can pass through.)
Height: Expected maximum snowfall plus 200 mm (7-7/8 in)
Width: Within the unit width (If the raised base is too wide, snow will accumulate on the raised base.)
・When the unit is used in a cold region and the heating operation is continuously performed for a long time when the outside air temperature is
below freezing, install a heater on the raised base or take other appropriate measures to prevent water from freezing on the raised base.


GB
GB-13
WT07828X01
9. Refrigerant piping work
Do not use any refrigerant other than the type indicated in the manuals for the unit and on the nameplate.
- Doing so will cause the unit or pipes to burst, or result in an explosion or fire during use, during repairs, or at the
time of disposal of the unit.
- It may also be in violation of applicable laws.
- MITSUBISHI ELECTRIC CORPORATION cannot be held responsible for malfunctions or accidents resulting from
the use of the wrong type of refrigerant.
After the installation has been completed, check for refrigerant leaks.
- If the refrigerant leaks, oxygen starvation may result. If the leaked refrigerant comes in contact with a heat source,
toxic gas will be generated.
Use the following tools specifically designed for use with the specified refrigerant: Gauge manifold, charge
hose, gas leak detector, check valve, refrigerant charge base, vacuum gauge, and refrigerant recovery
equipment.
- Gas leak detectors for conventional refrigerants will not react to a refrigerant that does not contain chlorine.
- If the specified refrigerant is mixed with water, refrigerant oil, or another refrigerant, the refrigerant oil will deteriorate
and the compressor will malfunction.
Do not use existing refrigerant piping.
- The old refrigerant and refrigerant oil in the existing piping contain a large amount of chlorine, which will cause the
refrigerant oil in the new unit to deteriorate and cause the compressor to malfunction.
9-1. Restrictions
・Existing refrigerant piping must not be used because the design pressure for systems using R410A is higher than that for systems using other
types of refrigerants.
・Do not install outdoor unit piping when it is raining.
・Do not use special detergents for washing piping.
・Always observe the restrictions on refrigerant piping (such as pipe size, pipe length, and vertical separation distance) to prevent equipment failure
or a decline in heating/cooling performance.
・Do not install solenoid valves to prevent oil backflow and compressor start-up failure.
・Do not install a sight glass because it may show improper refrigerant flow. If a sight glass is installed, inexperienced technicians that use the glass
may overcharge the refrigerant.
・The pipe from multiple outdoor units must be installed so that oil will not accumulate in the pipe under certain conditions. Refer to the figures
below for details.
* Small dots in the figures indicate branching points.
ⒶTo a BC controller
(1) The pipe from the outdoor units must be inclined downward to the indoor unit side. In the figure on the right, because the pipe is inclined
upward, the oil in the pipe accumulates when Unit 1 is in operation and Unit 2 is stopped.
Ⓐ
Ⓐ
(2) The distance between the unit bottom and the pipe (H) must be 0.2 m (7-7/8 in) or below. In the figure on the right, because the distance is
more than 0.2 m (7-7/8 in), the oil accumulates in Unit 1 when Unit 2 is in operation and Unit 1 is stopped.
H
Ⓐ
Ⓐ
H
Ⓐ
Unit 2
Unit 1 Unit 2Unit 1
Unit 2
Unit 2
Unit 1
Unit 1
+PLQ
Unit 2Unit 1
H > 0.2 m (7-7/8 in)

GB-14
WT07828X01
(3) The vertical separation between units (H) must be 0.1 m (3-15/16 in) or below. In the figure on the right, because the distance is more than
0.1 m (3-15/16 in), the oil accumulates in Unit 1 when Unit 2 is in operation and Unit 1 is stopped.
H
Ⓐ
H
Ⓐ
(4) The vertical separation between units (H) must be 0.1 m (3-15/16 in) or below. In the figure on the right, because the distance is more than
0.1 m (3-15/16 in), the oil accumulates in Unit 2 when Unit 1 is in operation and Unit 2 is stopped.
H
Ⓐ
H
Ⓐ
・0DNHVXUHWKDWWKHLQFOLQDWLRQWROHUDQFHRIWKH7ZLQQLQJ.LWLVÛWRWKHJURXQGWRDYRLGXQLWGDPDJH
±15°
ⒶⒶTwinning Kit
・Do not install traps to prevent oil backflow and compressor start-up failure.
9-2. Pipe selection
Use refrigerant piping made of phosphorus deoxidized copper (copper and copper alloy seamless pipes) that
meets local requirements. Pipe joints should also meet local requirements. Keep the inner and outer surfaces
of the pipes clean and free of sulphur, oxides, dust/dirt, shaving particles, oils, moisture, or any other
contaminants.
- Contaminants on the inside of the refrigerant piping will cause the refrigerant oil to deteriorate and cause the
compressor to malfunction.
Use refrigerant pipes for use with R410A refrigerant system. Piping for systems for use with other types of refrigerants may not be able to be used.
Use refrigerant pipes with the thicknesses specified in the table below.
Size [mm (in)] Radial thickness [mm (mil)] Type
ø6.35 (ø1/4) 0.8 (32) Type-O
ø9.52 (ø3/8) 0.8 (32) Type-O
ø12.7 (ø1/2) 0.8 (32) Type-O
ø15.88 (ø5/8) 1.0 (40) Type-O
ø19.05 (ø3/4) 1.2 (48) Type-O
1.0 (40) Type-1/2H or H
ø22.2 (ø7/8) 1.0 (40) Type-1/2H or H
ø25.4 (ø1) 1.0 (40) Type-1/2H or H
ø28.58 (ø1-1/8) 1.0 (40) Type-1/2H or H
ø31.75 (ø1-1/4) 1.1 (44) Type-1/2H or H
ø34.93 (ø1-3/8) 1.2 (48) Type-1/2H or H
ø41.28 (ø1-5/8) 1.4 (56) Type-1/2H or H
9-3. Twinning kit selection
Select appropriate twinning kits (sold separately), referring to the sections below.
* Use an adapter, if necessary, to connect a refrigerant pipe to a twinning pipe of a different diameter.
* The maximum number of connectable ports is 48.
9-3-1. 2-Branch Joint Pipe
A 2-Branch Joint Pipe is used to connect multiple indoor units to a port, or to connect two sub BC controllers.
Total capacity of downstream indoor units Kit model
30 or below CMY-Y102SS-G2
9-3-2. Joint Pipe Kit
A Joint Pipe Kit is used to connect an indoor unit of P100 model or above.
Indoor unit model Kit model
P36 to P96 CMY-R160C-J1
Unit 1
Unit 2
Unit 1
+PLQ
Unit 2
Unit 1
H > 0.1 m (3-15/16 in)
Unit 1
Unit 2
Unit 1
+PLQ
Unit 2
Unit 1
H > 0.1 m (3-15/16 in)

GB
GB-15
WT07828X01
9-3-3. Outdoor unit twinning kit
Outdoor unit twinning kit is used to combine multiple outdoor units.
Total capacity of outdoor units Kit model
P168 to P192ZSKMU CMY-R100CBK2
P216 to P288ZSKMU CMY-R100XLCBK
9-4. Pipe connection example
9-4-1. Example of pipe connection between outdoor units, and between an outdoor unit and BC
controller (R2 system)
Ⓐ
Ⓒ
Ⓑ
Ⓔ
Ⓕ
Ⓓ
ⒶOutdoor unit twinning kit (low-pressure side)
ⒷOutdoor unit twinning kit (High-pressure side)
ⒸOn-site piping between outdoor units (low-
pressure side)
ⒹOn-site piping to a BC controller (low-pressure
side)
ⒺOn-site piping to a BC controller (High-
pressure side)
ⒻThe pipe section before the twinning pipe must
have at least 500 mm (19-11/16 in) of straight
section.
・The outdoor unit twinning kit on the low-pressure side must be placed in the outdoor unit that has the larger capacity index of the two,
regardless of the relative positions of the outdoor units or their addresses. (If outdoor units that have the same capacity are used in
combination, the twinning kit can be placed in either outdoor unit.) If the twinning kit is placed in the outdoor unit that has the smaller capacity,
refrigerant will not be properly distributed and compressor failure may result.

GB-16
WT07828X01
9-4-2. Example of pipe connection between an outdoor unit and BC controller, and between a BC
controller and indoor unit (R2 system)
P72 to P144ZKMU
B
A
ab
c
d
Ⓔ
ⒺⒺⒻ
Ⓐ
ⒷⒸ
Ⓖ
Ⓘ
Ⓗ
ⒶOutdoor unit
ⒷBC controller (Standard)
ⒸBC controller (Main)
ⒹBC controller (Sub)
ⒺIndoor unit (Total capacity of downstream indoor
units: 06 to 30)
ⒻIndoor unit (Total capacity of downstream indoor
units: 36 to 96)
ⒼReducer
ⒽJoint Pipe Kit
Ⓘ2-Branch Joint Pipe
ⒿOutdoor unit twinning kit
P168 to P288ZSKMU
a
C
bBc d f
D
E
Ae
A1A2Ⓔ
Ⓔ
Ⓓ
Ⓓ
Ⓒ
ⒺⒺⒻⒺ
ⒶⒶ
Ⓙ
Ⓖ
Ⓘ
Ⓘ
Ⓗ
*1
g
i
j
h
Ⓕ
ⒷⒸⒹ
Unit 1
Unit 1 Unit 2
*1

GB
GB-17
WT07828X01
Pipes A, A1, A2[mm (in)]
Unit model Combination unit Pipe A Pipe A1*1Pipe A2*1
Unit 1 Unit 2 High-pressure Low-pressure High-pressure Low-pressure High-pressure Low-pressure
P72ZKMU - - ø15.88 (5/8) ø19.05 (3/4) - - - -
P96ZKMU - - ø19.05 (3/4) ø22.2 (7/8) - - - -
P120ZKMU - - ø19.05 (3/4) ø28.58 (1-1/8) - - - -
P144ZKMU - - ø22.2 (7/8) ø28.58 (1-1/8) ----
P168ZSKMU P96 P72 ø22.2 (7/8) ø28.58 (1-1/8) ø19.05 (3/4) ø22.2 (7/8) ø15.88 (5/8) ø19.05 (3/4)
P192ZSKMU P96 P96 ø22.2 (7/8) ø28.58 (1-1/8) ø19.05 (3/4) ø22.2 (7/8) ø19.05 (3/4) ø22.2 (7/8)
P216ZSKMU P120 P96 ø28.58 (1-1/8) ø28.58 (1-1/8) ø19.05 (3/4) ø28.58 (1-1/8) ø19.05 (3/4) ø22.2 (7/8)
P240ZSKMU P120 P120 ø28.58 (1-1/8) ø34.93 (1-3/8) ø19.05 (3/4) ø28.58 (1-1/8) ø19.05 (3/4) ø28.58 (1-1/8)
P264ZSKMU P144 P120 ø28.58 (1-1/8) ø34.93 (1-3/8) ø22.2 (7/8) ø28.58 (1-1/8) ø19.05 (3/4) ø28.58 (1-1/8)
P288ZSKMU P144 P144 ø28.58 (1-1/8) ø34.93 (1-3/8) ø22.2 (7/8) ø28.58 (1-1/8) ø22.2 (7/8) ø28.58 (1-1/8)
*1 If the combination units 1 and 2 are in a different order as listed in the table, make sure to use the pipes of appropriate size for the situation.
Pipe B [mm (in)]
Total capacity of indoor units Pipe
Liquid Gas
30 or below ø9.52 (ø3/8) ø15.88 (ø5/8)
Pipes C, D, E [mm (in)]
Total model number of downstream
indoor units Pipe
High-pressure Low-pressure Liquid
72 or below ø15.88 (ø5/8) ø19.05 (ø3/4) ø9.52 (ø3/8)
73 to 108 ø19.05 (ø3/4) ø22.2 (ø7/8) ø9.52 (ø3/8)
109 to 126 ø19.05 (ø3/4) ø28.58 (ø1-1/8) ø12.7 (ø1/2)
127 to 144 ø22.2 (ø7/8) ø28.58 (ø1-1/8) ø12.7 (ø1/2)
145 to 168 ø22.2 (ø7/8) ø28.58 (ø1-1/8) ø15.88 (ø5/8)
Pipes a,b,c,d,e,f [mm (in)]
Capacity index of indoor unit Pipe
Liquid Gas
06, 08, 12, 15, 18 ø6.35 (ø1/4) ø12.7 (ø1/2)
24, 27, 30, 36, 48, 54 ø9.52 (ø3/8) ø15.88 (ø5/8)
72 ø9.52 (ø3/8) ø19.05 (ø3/4)
96 ø9.52 (ø3/8) ø22.2 (ø7/8)
Pipes g, h, i, j [mm (in)]
Capacity index of indoor unit Liquid pipe Gas pipe
ghi j
36 ø9.52 (ø3/8) ø9.52 (ø3/8) ø15.88 (ø5/8) ø15.88 (ø5/8)
48 ø9.52 (ø3/8) ø9.52 (ø3/8) ø15.88 (ø5/8) ø15.88 (ø5/8)
54 ø9.52 (ø3/8) ø9.52 (ø3/8) ø15.88 (ø5/8) ø15.88 (ø5/8)
72 ø9.52 (ø3/8) ø9.52 (ø3/8) ø19.05 (ø3/4) ø15.88 (ø5/8)
96 ø9.52 (ø3/8) ø9.52 (ø3/8) ø22.2 (ø7/8) ø15.88 (ø5/8)
9-5. Piping connections and valve operations
Before heating the brazed sections, remove the gas and oil that are trapped in the pipes.
- Failure to do so may generate fire, resulting in serious injury.
Ventilate the room while servicing the unit.
- If the refrigerant leaks, oxygen deficiency may result. If the leaked refrigerant comes in contact with a heat source,
toxic gas will be generated.
Store pipes indoors, and keep both ends of the pipes sealed until just before making a flare connection or
brazing. (Store elbows and other joints in plastic bags.)
- If dust, dirt, or water enters the refrigerant lines, the refrigerant oil will deteriorate and the compressor will
malfunction.
Keep the service valves closed until refrigerant charging is completed.
- Failure to do so will damage the unit.
Place a wet towel on the service valves before brazing the pipes to keep the temperature of the valves from
rising above 120ºC (248ºF).
- Failure to do so may result in equipment damage.

GB-18
WT07828X01
Keep the flame out of contact with the cables and metal sheet when brazing the pipes.
- Failure to do so may result in burnout or malfunction.
Braze the pipes with a nitrogen purge to avoid oxidation.
- Oxidized flux inside the refrigerant pipes will cause the refrigerant oil to deteriorate and cause the compressor to
malfunction.
9-5-1. Removing the pinched connecting pipes
When shipped, a pinched connecting pipe is attached to the on-site high-pressure and low-pressure valves to prevent gas leakage.
Take the following steps ①through ④to remove the pinched connecting pipe before connecting refrigerant pipes to the outdoor unit.
①Check that the refrigerant service valve is fully closed (turned clockwise all the way).
②Connect a charging hose to the service port on the low-pressure/high-pressure refrigerant service valve, and extract the gas in the pipe
section between the refrigerant service valve and the pinched connecting pipe.
③After vacuuming gas from the pinched connecting pipe, sever the pinched connecting pipe at the location shown in the figure below and drain
the refrigerant.
④ After completing ②and ③heat the brazed section to remove the pinched connecting pipe.
P72,P96 P120,P144
<B> <A>
E
A
D
G
F
<B> <A>
S
O
G
C
D
B
F
E
A
D
<A> Refrigerant service valve (low-pressure side/brazed type)
<B> Refrigerant service valve (high-pressure side/brazed type)
ⒶShaft
Fully closed at the factory, when connecting the piping, and when vacuuming. Open fully after
these operations are completed.
<When opening>
7XUQWKHVKDIWFRXQWHUFORFNZLVHZLWKDKH[DJRQDOZUHQFK
7XUQDURXQGWKHVKDIWXQWLOLWVWRSV
<When closing>
7XUQWKHVKDIWFORFNZLVHZLWKDKH[DJRQDOZUHQFK
7XUQDURXQGWKHVKDIWXQWLOLWVWRSV
ⒷShaft
Fully closed at the factory, when connecting the piping, and when vacuuming.
Open fully after these operations are completed.
<When opening>
7XUQWKHVKDIWFRXQWHUFORFNZLVH
7XUQDURXQGWKHVKDIWXQWLOLWVWRSV
<When closing>
7XUQWKHVKDIWFORFNZLVH
7XUQDURXQGWKHVKDIWXQWLOLWVWRSV
ⒸStopper pin
Prevents the shaft from turning 90°or more.
ⒹService port
Available for gas venting of the pinched connecting pipe, or vacuuming in the refrigerant pipes
on the site.
ⒺCap
Remove the cap before operating the shaft. Be sure to return it to the original position after
completing the operation.
ⒻPinched connecting pipe severing portion
ⒼPinched connecting pipe brazing portion