Panasonic CU-4E23QBR User manual

© Panasonic Corporation 2014
Order No: PAPAMY1404064CE
Air Conditioner
Outdoor Unit
CU-4E23QBR
CU-4E27QBR
CU-5E34QBR
Destination
Australia
New Zealand
Please file and use this manual together with the service manual for Model No. CS-MRE5QKR CS-MRE7QKR CS-MRE9QKR
CS-MRE12QKR CS-MRE18QKR CS-MRE24QKR, Order No. PAPAMY1404048CE
PRECAUTION OF LOW TEMPERATURE
In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.
WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to
service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

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TABLE OF CONTENTS
PAGE PAGE
1. Safety Precautions .............................................3
2. Specifications .....................................................5
2.1 CU-4E23QBR ...............................................5
2.2 CU-4E27QBR ...............................................7
2.3 CU-5E34QBR ...............................................9
3. Dimensions .......................................................21
3.1 CU-4E23QBR .............................................21
3.2 CU-4E27QBR CU-5E34QBR ....................21
4. Refrigeration Cycle Diagram ...........................22
4.1 CU-4E23QBR .............................................22
4.2 CU-4E27QBR .............................................23
4.3 CU-5E34QBR .............................................24
5. Block Diagram ..................................................25
5.1 CU-4E23QBR .............................................25
5.2 CU-4E27QBR .............................................26
5.3 CU-5E34QBR .............................................27
6. Wiring Connection Diagram ............................28
6.1 CU-4E23QBR .............................................28
6.2 CU-4E27QBR .............................................29
6.3 CU-5E34QBR .............................................30
7. Electronic Circuit Diagram ..............................31
7.1 CU-4E23QBR .............................................31
7.2 CU-4E27QBR .............................................32
7.3 CU-5E34QBR .............................................33
8. Printed Circuit Board .......................................34
8.1 Main Printed Circuit Board .........................34
8.2 Noise Filter Printed Circuit Board ...............36
8.3 Display Printed Circuit Board .....................37
9. Installation Information....................................38
9.1 CU-4E23QBR .............................................38
9.2 CU-4E27QBR .............................................39
9.3 CU-5E34QBR .............................................40
10. Installation Instruction.....................................41
10.1 Select the Best Location.............................41
10.2 Install the Outdoor Unit...............................42
10.3 Connect the Piping .....................................42
10.4 Evacuation of the Equipment .....................43
10.5 Connect the Cable to the Outdoor Unit ......44
10.6 Heat Insulation............................................45
10.7 Disposal of Outdoor Unit Drain Water........45
11. Installation Instruction.....................................46
11.1 Select the Best Location.............................46
11.2 Install the Outdoor Unit...............................47
11.3 Connect the Piping .....................................47
11.4 Evacuation of the Equipment .....................48
11.5 Connect the Cable to the Outdoor Unit ......49
11.6 Heat Insulation............................................50
11.7 Disposal of Outdoor Unit Drain Water........50
12. Operation Control.............................................51
12.1 Cooling Operation...................................... 51
12.2 Heating Operation ..................................... 52
13. Simultaneous Operation Control ................... 53
14. Protection Control........................................... 54
14.1 Freeze Prevention Control (Cool).............. 54
14.2 Dew Prevention Control (Cool).................. 54
14.3 Electronic Parts Temperature Rise
Protection 1 (Cool)..................................... 54
14.4 Electronic Parts Temperature Rise
Protection 2 (Cool)..................................... 54
14.5 Cooling Overload Control (Cool) ............... 55
14.6 Heating Overload Control (Heat)............... 55
14.7 Extreme Low Temperature Compressor
Low Pressure Protection Control (Heat).... 55
14.8 Deice Control............................................. 56
14.9 Time Delay Safety Control (Restart
Control)...................................................... 56
14.10 30 seconds Force Operation ..................... 56
14.11 Total Current Control................................. 56
14.12 IPM (power transistor) Protection
Control ....................................................... 56
14.13 Compressor Protection Control (Gas
Leak Detection Control 1).......................... 57
14.14 Compressor Protection Control (Gas
Leak Detection Control 2).......................... 57
14.15 Valve Close Detection Control .................. 57
14.16 Compressor Discharge High Pressure
Protection Control...................................... 57
15. Servicing Mode ................................................ 58
15.1 Cooling Only Operation ............................. 58
16. Troubleshooting Guide................................... 61
16.1 Self Diagnosis Function............................. 61
17. Disassembly and Assembly Instructions ..... 64
17.1 Outdoor Unit Removal Procedure
(CU-4E23QBR).......................................... 64
17.2 Outdoor Unit Removal Procedure
(CU-4E27QBR CU-5E34QBR)................. 67
18. Technical Data ................................................. 70
18.1 Operation Characteristics
(CU-4E23QBR).......................................... 70
18.2 Operation Characteristics
(CU-4E27QBR).......................................... 82
18.3 Operation Characteristics
(CU-5E34QBR)........................................ 112
19. Exploded View and Replacement Parts
List .................................................................. 144
19.1 CU-4E23QBR .......................................... 144
19.2 CU-4E27QBR CU-5E34QBR ................. 147

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CAUTION
WARNING
WARNING
1. Safety Precautions
Read the following “SAFETY PRECAUTIONS” carefully before perform any servicing.
Electrical work must be installed or serviced by a licensed electrician. Be sure to use the correct rating of the
power plug and main circuit for the model installed.
The caution items stated here must be followed because these important contents are related to safety. The
meaning of each indication used is as below. Incorrect installation or servicing due to ignoring of the instruction
will cause harm or damage, and the seriousness is classified by the following indications.
This indication shows the possibility of causing death or serious injury.
This indication shows the possibility of causing injury or damage to properties.
The items to be followed are classified by the symbols:
Carry out test run to confirm that no abnormality occurs after the servicing. Then, explain to user the operation,
care and maintenance as stated in instructions. Please remind the customer to keep the operating instructions for
future reference.
1. Do not modify the machine, part, material during repairing service.
2. If wiring unit is supplied as repairing part, do not repair or connect the wire even only partial wire break. Exchange the whole wiring unit.
3. Do not wrench the fasten terminal. Pull it out or insert it straightly.
4. Engage dealer or specialist for installation and servicing. If installation or servicing done by the user is defective, it will cause water leakage,
electrical shock or fire.
5. Install according to this installation instructions strictly. If installation is defective, it will cause water leakage, electric shock or fire.
6. Use the attached accessories parts and specified parts for installation and servicing. Otherwise, it will cause the set to fall, water leakage,
fire or electrical shock.
7. Install at a strong and firm location which is able to withstand the set’s weight. If the strength is not enough or installation is not properly done,
the set will drop and cause injury.
8. For electrical work, follow the local national wiring standard, regulation and the installation instruction. An independent circuit and single outlet
must be used. If electrical circuit capacity is not enough or defect found in electrical work, it will cause electrical shock or fire.
9. This equipment is strongly recommended to install with Earth Leakage Circuit Breaker (ELCB) or Residual Current Device (RCD).
Otherwise, it may cause electrical shock and fire in case equipment breakdown or insulation breakdown.
10. Do not use joint cable for indoor/outdoor connection cable. Use the specified indoor/outdoor connection cable, refer to Installation
Instruction CONNECT THE CABLE TO THE INDOOR UNIT and connect tightly for indoor/outdoor connection. Clamp the cable so that no
external force will be acted on the terminal. If connecting or fixing is not perfect, it will cause heat up or fire at the connection.
11. Wire routing must be properly arranged so that control board cover is fixed properly. If control board cover is not fixed perfectly, it will cause
heat-up or fire at the connection point of terminal, fire or electrical shock.
12. When install or relocate air conditioner, do not let any substance other than the specified refrigerant, eg. air etc. mix into refrigeration cycle
(piping). (Mixing of air etc. will cause abnormal high pressure in refrigeration cycle and result in explosion, injury etc.).
13. Do not install outdoor unit near handrail of veranda. When installing air-conditioner unit at veranda of high rise building, child may climb up to
outdoor unit and cross over the handrail and causing accident.
14. This equipment must be properly earthed. Earth line must not be connected to gas pipe, water pipe, earth of lightning rod and
telephone. Otherwise, it may cause electric shock in case equipment breakdown or insulation breakdown.
15. Keep away from small children, the thin film may cling to nose and mouth and prevent breathing.
16. Do not use unspecified cord, modified cord, joint cord or extension cord for power supply cord. Do not share the single outlet
with other electrical appliances. Poor contact, poor insulation or over current will cause electrical shock or fire.
17. Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the
flare may break and cause refrigerant gas leakage.
This symbol denotes item that is PROHIBITED from doing.

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CAUTION
18. For R410A models, when connecting the piping, do not use any existing (R22) pipes and flare nuts. Using such same may
cause abnormally high pressure in the refrigeration cycle (piping), and possibly result in explosion and injury. Use only R410A
materials.
Thickness of copper pipes used with R410A must be more than 0.8mm. Never use copper pipes thinner than 0.8mm.
It is desirable that the amount of residual oil is less than 40 mg/10m.
19. During installation, install the refrigerant piping properly before run the compressor. (Operation of compressor without fixing refrigeration
piping and valves at opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury
etc.).
20. During pump down operation, stop the compressor before remove the refrigeration piping. (Removal of refrigeration piping while
compressor is operating and valves are opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result
in explosion, injury etc.).
21. After completion of installation or service, confirm there is no leakage or refrigerant gas. It may generate toxic gas when the refrigerant
contacts with fire.
22. Ventilate if there is refrigerant gas leakage during operation. It may cause toxic gas when refrigerant contacts with fire.
23. Do not insert your fingers or other objects into the unit, high speed rotating fan may cause injury.
24. Must not use other parts except original parts described in catalog and manual.
25. Using of refrigerant other than the specified type may cause product damage, burst and injury etc.
1. Do not install the unit at place where leakage of flammable gas may occur. In case gas leaks and accumulates at surrounding of the
unit, it may cause fire.
2. Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage
the furniture.
3. Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare
may break and cause refrigerant gas leakage.
4. Do not touch outdoor unit air inlet and aluminium fin. It may cause injury.
5. Select an installation location which is easy for maintenance.
6. Pb free solder has a higher melting point than standard solder; typically the melting point is 50°F – 70°F (30°C – 40°C) higher. Please use
a high temperature solder iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F (370 ± 10°C). Pb free solder
will tend to splash when heated too high (about 1100°F / 600°C).
7. CU-4E23QBR
Power supply connection to the room air conditioner.
Use power supply cord (3 x 2.5 mm2) type designation 60245 IEC 57 or heavier cord.
Connect the power supply cord of the air conditioner to the mains using one of the following method.
Power supply point should be in easily accessible place for power disconnection in case of emergency.
In some countries, permanent connection of this air conditioner to the power supply is prohibited.
i. Power supply connection to the receptacle using power plug.
Use an approved 20A (CU-4E23***) power plug with earth pin for the connection to the socket.
ii. Power supply connection to a circuit breaker for the permanent connection.
Use an approved 20A (CU-4E23***) circuit breaker for the permanent connection. It must be a double pole switch with a minimum 3.0 mm
contact gap.
8. CU-4E27QBR CU-5E34QBR
Power supply connection to the room air conditioner.
Use power supply cord CU-4E27*** (3 x 2.5 mm2), CU-5E34*** (3 x 4.0 mm2) type designation 60245 IEC 57 or heavier cord.
Connect the power supply cord of the air conditioner to the mains using one of the following method.
Power supply point should be in easily accessible place for power disconnection in case of emergency.
In some countries, permanent connection of this air conditioner to the power supply is prohibited.
i. Power supply connection to the receptacle using power plug.
Use an approved 20A (CU-4E27***), 25A (CU-5E34***) power plug with earth pin for the connection to the socket.
ii. Power supply connection to a circuit breaker for the permanent connection.
Use an approved 20A (CU-4E27***), 25A (CU-5E34***) circuit breaker for the permanent connection. It must be a double pole switch with a
minimum 3.0 mm contact gap.
9. Do not release refrigerant during piping work for installation, servicing, reinstallation and during repairing a refrigerant parts.
Take care of the liquid refrigerant, it may cause frostbite.
10. Installation or servicing work: It may need two people to carry out the installation or servicing work.
11. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc.
12. Do not sit or step on the unit, you may fall down accidentally.
13. Do not touch the sharp aluminum fins or edges of metal parts.
If you are required to handle sharp parts during installation or servicing, please wear hand glove.
Sharp parts may cause injury.

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2. Specifications
2.1 CU-4E23QBR
Item Unit OUTDOOR UNIT
Indoor Unit Combination 1.6kW + 1.6kW + 1.6kW + 2.0kW
Phase, Hz Single, 50
Power Source
V 230 240
Min. Mid. Max.
kW 1.90 6.80 8.80
Capacity
BTU/h 6480 23200 30000
Running Current A 7.7 7.5
Power Input kW 0.34 1.68 2.47
EER W/W 5.59 4.05 3.56
Electrical
Data
Power Factor % 95 93
Sound Pressure Level dB-A (H/L) 48 / - 48 / -
Cooling Operation
Noise
Sound Power Level dB (H/L) 62 / - 62 / -
kW 3.00 8.50 10.60
Capacity
BTU/h 10200 29000 36100
Running Current A 8.8 8.6
Power Input kW 0.58 1.95 2.60
COP W/W 5.17 4.36 4.08
Electrical
Data
Power Factor % 96 94
Sound Pressure Level dB-A (H/L) 49 / - 49 / -
Heating Operation
Noise
Sound Power Level dB (H/L) 63 / - 63 / -
Maximum Current A 15.6
Maximum Input Power kW 3.55
Starting Current A 8.8
Height mm 795
Width mm 875
Dimension
Depth mm 320
Net Weight kg 72
Connection Cable 4 x 1.5 mm2
Pipe Length Range (1 room) m 3 ~ 25
Maximum Pipe Length (Total Room) m 60
Standard Length m 5
Height Different m 15
Additional Gas Amount g/m 20
Pipe Length for Additional Gas m 30
Liquid Side mm (inch) 6.35 (1/4)
Refrigerant Pipe Diameter
Gas Side mm (inch) 9.52 (3/8)
Type Hermetic Motor / Rotary
Motor Type Brushless (4-poles)
Compressor
Rated Output kW 1.30
Type Propeller Fan
Motor Type DC Motor (8-poles)
Fan Motor
Rated Output W 60
Fan Speed High (Cooling / Heating) RPM 600 / 620

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Item Unit OUTDOOR UNIT
Type Plate fin configuration forced draft type
Tube Material Copper
Fin Material Aluminium (Blue Coat)
Row / Stage 2 x 36
Heat Exchanger
FPI 19
Air Volume High (Cooling / Heating) m³/min (ft³/min) 42.5 (1500) / 44.1 (1557)
Refrigerant Control Device Expansion Valve
Refrigerant Oil cm3FV50S (900)
Refrigerant (R410A) kg 2.64
Dry Bulb Wet Bulb
Maximum °C 46 26
Cooling
Minimum °C -10 -
Maximum °C 24 18
Outdoor Operation Range
Heating
Minimum °C -15 -16
Note
Specifications are subject to change without notice for further improvement.

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2.2 CU-4E27QBR
Item Unit OUTDOOR UNIT
Indoor Unit Combination 2.0kW + 2.0kW + 2.0kW + 2.0kW
Phase, Hz Single, 50
Power Source
V 230 240
Min. Mid. Max.
kW 3.00 8.00 9.20
Capacity
BTU/h 10200 27300 31400
Running Current A 9.8 9.4
Power Input kW 0.53 2.15 2.87
EER W/W 5.66 3.72 3.21
Electrical
Data
Power Factor % 95 95
Sound Pressure Level dB-A (H/L) 61 / - 61 / -
Cooling Operation
Noise
Sound Power Level dB (H/L) 67 / - 67 / -
kW 4.20 9.40 10.60
Capacity
BTU/h 14300 32100 36100
Running Current A 10.2 9.8
Power Input kW 0.70 2.18 3.06
COP W/W 6.00 4.31 3.46
Electrical
Data
Power Factor % 93 93
Sound Pressure Level dB-A (H/L) 52 / - 52 / -
Heating Operation
Noise
Sound Power Level dB (H/L) 68 / - 68 / -
Maximum Current A 19.0
Maximum Input Power kW 4.33
Starting Current A 10.2
Height mm 999
Width mm 940
Dimension
Depth mm 340
Net Weight kg 80
Connection Cable 4 x 1.5 mm2
Pipe Length Range (1 room) m 3 ~ 25
Maximum Pipe Length (Total Room) m 70
Standard Length m 5
Height Different m 15
Additional Gas Amount g/m 20
Pipe Length for Additional Gas m 45
Liquid Side mm (inch) 6.35 (1/4)
Refrigerant Pipe Diameter
Gas Side mm (inch) 9.52 (3/8), 12.7 (1/2) [MRE24 only]
Type Hermetic Motor / Rotary
Motor Type Brushless Motor (4-poles)
Compressor
Rated Output kW 1.70
Type Propeller Fan
Motor Type DC Motor (8-poles)
Fan Motor
Rated Output W 90
Fan Speed High (Cooling / Heating) RPM 600 / 600

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Item Unit OUTDOOR UNIT
Type Plate fin configuration forced draft type
Tube Material Copper
Fin Material Aluminium (Blue Coat)
Row / Stage 2 x 46
Heat Exchanger
FPI 19
Air Volume High (Cooling / Heating) m³/min (ft³/min) 50.4 (1779) / 55.6 (1962)
Refrigerant Control Device Expansion Valve
Refrigerant Oil cm3FV50S (900)
Refrigerant (R410A) kg 3.40
Dry Bulb Wet Bulb
Maximum °C 46 26
Cooling
Minimum °C -10 -
Maximum °C 24 18
Outdoor Operation Range
Heating
Minimum °C -15 -16
Note
Specifications are subject to change without notice for further improvement.

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2.3 CU-5E34QBR
Item Unit OUTDOOR UNIT
Indoor Unit Combination 2.0kW + 2.0kW + 2.0kW + 2.0kW + 2.0kW
Phase, Hz Single, 50
Power Source
V 230 240
Min. Mid. Max.
kW 2.90 10.00 11.50
Capacity
BTU/h 9890 34100 39200
Running Current A 13.6 13.2
Power Input kW 0.55 2.86 3.86
EER W/W 5.27 3.50 2.98
Electrical
Data
Power Factor % 91 90
Sound Pressure Level dB-A (H/L) 53/ - 53/ -
Cooling Operation
Noise
Sound Power Level dB (H/L) 69 / - 69 / -
kW 3.40 12.00 14.50
Capacity
BTU/h 11600 40900 49400
Running Current A 13.6 13.2
Power Input kW 0.53 2.96 4.24
COP W/W 6.42 4.05 3.42
Electrical
Data
Power Factor % 95 93
Sound Pressure Level dB-A (H/L) 54 / - 54 / -
Heating Operation
Noise
Sound Power Level dB (H/L) 70 / - 70 / -
Maximum Current A 21.3
Maximum Input Power kW 4.84
Starting Current A 13.6
Height mm 999
Width mm 940
Dimension
Depth mm 340
Net Weight kg 81
Connection Cable 4 x 1.5 mm2
Pipe Length Range (1 room) m 3 ~ 25
Maximum Pipe Length (Total Room) m 80
Standard Length m 5
Height Different m 15
Additional Gas Amount g/m 20
Pipe Length for Additional Gas m 45
Liquid Side mm (inch) 6.35 (1/4)
Refrigerant Pipe Diameter
Gas Side mm (inch) 9.52 (3/8) / 12.7 (1/2) [MRE24]
Type Hermetic Motor / Rotary
Motor Type Brushless (4-poles)
Compressor
Rated Output kW 1.70
Type Propeller Fan
Motor Type DC Motor (8-poles)
Fan Motor
Rated Output W 90
Fan Speed High (Cooling / Heating) RPM 650 / 740

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Item Unit OUTDOOR UNIT
Type Plate fin configuration forced draft type
Tube Material Copper
Fin Material Aluminium (Blue Coat)
Row / Stage 2 x 46
Heat Exchanger
FPI 19
Air Volume High (Cooling / Heating) m³/min (ft³/min) 60.8 (2146) / 70.1 (2475)
Refrigerant Control Device Expansion Valve
Refrigerant Oil cm3FV50S (900)
Refrigerant (R410A) kg 3.40
Dry Bulb Wet Bulb
Maximum °C 46 26
Cooling
Minimum °C -10 -
Maximum °C 24 18
Outdoor Operation Range
Heating
Minimum °C -15 -16
Note
Specifications are subject to change without notice for further improvement.

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Multi Split Combination Possibility:
oA single outdoor unit enables air conditioning of up to four separate rooms for CU-4E23QBR.

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Multi Split Combination Possibility:
A single outdoor unit enables air conditioning of up to four separate rooms for CU-4E27QBR.
A single outdoor unit enables air conditioning of up to five separate rooms for CU-5E34QBR.

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Indoor Unit : CS-MRE5/7/9/12/18/24QKR, CS-E12/18QD3RW, CS- E12/18QB4RW
Outdoor Unit : CU-4E23QBR

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Indoor Unit : CS-MRE5/7/9/12/18/24QKR, CS-E12/18QD3RW, CS- E12/18QB4RW
Outdoor Unit : CU-4E27QBR

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Indoor Unit : CS-MRE5/7/9/12/18/24QKR, CS-E12/18QD3RW, CS- E12/18QB4RW
Outdoor Unit : CU-5E34QBR

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