Panasonic CU-2E18NBK Service Manual

Order No: PHAAM1111119A1

Outdoor Unit CU-2E18NBK

Please file and use this manual together with the service manual for Model No. CS-E9NKKW CS-E12NKKW, Order No. PHAAM1111089C1.

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.

In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.

PRECAUTION OF LOW TEMPERATURE

TABLE OF CONTENTS

1. Safety Precautions.............................................3

2. Specifications.....................................................5

2.1 CU-2E18NBK ...............................................5

3. Dimensions.........................................................8

4. Refrigeration Cycle Diagram............................. 9

5. Block Diagram ..................................................10

6. Wiring Connection Diagram............................11

7. Electronic Circuit Diagram ..............................12

8. Printed Circuit Board ....................................... 13

8.1 Main Printed Circuit Board .........................13

8.2 Noise Filter Printed Circuit Board...............14

8.3 Display Printed Circuit Board .....................14

9. Installation Information ...................................15

9.1 Check Points ..............................................15

10. Installation Instruction.....................................16

10.1 Select The Best Location ...........................16

10.2 Install The Outdoor Unit .............................17

10.3 Connect the Piping.....................................17

10.4 Evacuation of the Equipment .....................18

10.5 Connect The Cable To The Outdoor

Unit .............................................................19

10.6 Heat Insulation ...........................................19

11. Operation Control.............................................20

11.1 Cooling Operation ......................................20

11.2 Heating Operation ......................................21

12. Simultaneous Operation Control....................22

13. Protection Control............................................23

13.1 Freeze Prevention control (Cool) ...............23

13.2 Dew Prevention control (Cool) ...................23

13.3 Electronic Parts Temperature Rise

Protection 1 (Cool) .....................................23

13.4

Electronic Parts Temperature Rise

Protection 2 (Cool)......................................23

13.5 Cooling overload control (Cool)..................24

13.6 Heating overload control (Heat) .................24

13.7 Extreme Low Temperature Compressor low

pressure protection control (Heat)..............24

13.8 Deice Control..............................................25

13.9 Time Delay Safety Control

(Restart Control) .........................................25

13.10 30 seconds Force Operation ......................25

13.11 Total Current Control ..................................25

13.12 IPM (power transistor) Protection

Control ........................................................25

13.13 Compressor Protection Control

(Gas leak detection control 1) ....................26

13.14 Compressor Protection Control

(Gas leak detection control 2) ....................26

13.15 Valve close detection control......................26

13.16 Compressor discharge high pressure

protection control ........................................26

14. Servicing Mode .................................................27

14.1 CU-2E18NBK .............................................27

15. Troubleshooting Guide....................................29

15.1 Self Diagnosis Function..............................29

16. Disassembly and Assembly Instructions ......32

16.1 Outdoor Unit Removal Procedure ..............32

17. Technical Data ..................................................35

17.1 Operation Characteristics...........................35

18. Exploded View and Replacement Parts

List .....................................................................55

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.

WARNING

CAUTION

 The items to be followed are classified by the symbols:

This symbol denotes item that is PROHIBITED from doing.

 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.

This indication shows the possibility of causing death or serious injury.

This indication shows the possibility of causing injury or damage to properties.

WARNING

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.

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.

CAUTION

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. Power supply connection to the air conditioner.

Power supply cord shall be UL listed or CSA approved 4 conductor with minimum AWG12 wires. Power supply point should be in an 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. Fix power supply connection to a circuit breaker for the permanent connection. Use NRTL approved fuse or circuit breaker (rating refers to name plate) for the permanent connection.

8. 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.

9. Installation or servicing work: It may need two people to carry out the installation or servicing work.

10. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc.

11. Do not sit or step on the unit, you may fall down accidentally.

12. Do not touch the sharp aluminium 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.

2. Specifications

2.1 CU-2E18NBK

Item Unit OUTDOOR UNIT

Indoor Unit Combination 3.2kW + 3.2kW

Power Source

Capacity

Running Current A 7.6 - 6.9

Cooling Operation

Heating Operation

Maximum Current A 13.6

Starting Current A 9.0

Minimum Circuit Ampacity A 20

Dimension

Net Weight kg (lb) 69 (152)

Connection cable 3 + 1 (Earth) ø1.5 mm2

Pipe Length Range (1 room) m (ft) 3 ~ 25 (9.8 ~ 82.0)

Maximum Pipe Length (Total Room) m (ft) 50 (164.0)

Refrigerant Pipe Diameter

Compressor

Air Circulation

Fan Speed High RPM 570

Heat Exchanger

Electrical

Data

Noise

Capacity

Electrical

Data

Noise

Height mm (inch) 795 (31-5/16)

Width mm (inch) 875 + 95 (34-15/32 + 3-3/4)

Depth mm (inch) 320 (12-5/8)

Liquid Side mm (inch) 6.35 (1/4)

Gas Side mm (inch) 9.52 (3/8)

Type Hermetic Motor (Rotary)

Motor Type DC Brushless (4-poles)

Rated Output W 1.30k

Type Propeller Fan

Motor Type DC Brushless (8-poles)

Rated Output W 60

Type Plate fin configuration forced draft type

Tube Material Copper

Fin Material Aluminum

Row/Stage 2/36

FPI 19

Power Input kW 1.45 (0.39 ~ 1.84)

EER W/W 3.37 (5.38 ~ 3.18)

BTU/hW 11.50 (18.45 ~ 10.85)

Sound Pressure Level dB-A 48

Sound Power Level dB 62

Running Current A 9.0 - 8.1

Power Input kW 1.85 (0.42 ~ 2.29)

COP W/W 3.21 (5.02 ~ 3.14)

BTU/hW 10.90 (17.15 ~ 10.75)

Sound Pressure Level dB-A 49

Sound Power Level dB 63

kW 4.89 (2.10 ~ 5.86)

BTU/h 16700 (7200 ~ 20000)

kW 5.94 (2.11 ~ 7.20)

BTU/h 20200 (7200 ~ 24600)

1 Phase, 208 – 230V, 60Hz (Power supply from

outdoor unit)

Item Unit OUTDOOR UNIT

Air Volume High m3/min (ft3/min) 37.2 (1313)

Refrigerant Control Device Expansion Valve

Refrigerant Oil FV50S

Refrigerant (R410A) g (oz) 1.92k (67.8)

Dry Bulb Wet Bulb

Cooling

Indoor Operation Range

Heating

Cooling

Outdoor Operation Range

Heating

Maximum °C (°F) 32 (89.6) 23 (73.4)

Minimum °C (°F) 16 (60.8) 11 (51.8)

Maximum °C (°F) 30 (86.0) —

Minimum °C (°F) 16 (60.8) —

Maximum °C (°F) 43 (109.4) 26 (78.8)

Minimum °C (°F) 16 (60.8) 11 (51.8)

Maximum °C (°F) 24 (75.2) 18 (64.4)

Minimum °C (°F) -15 (5.0) -16 (3.2)

Note

 Specifications are subject to change without notice for further improvement.

 Multi split combination possibility:

o A single outdoor unit enables air conditioning of up to two separate rooms for CU-2E18NBK.

Outdoor Unit

CU-2E18NBK

A B

2.8 kW CS-E9NKKW

Wall

Capacity range of connectable indoor units From 5.6 kW to 6.4 kW

1 room maximum pipe length (m (ft)) 25 (82.0)

Allowable elevation (m (ft)) 15 (49.2)

Total allowable pipe length (m (ft)) 50 (164.0)

Total pipe length for maximum chargeless length (m (ft)) 20 (65.6)

Piping Length

Additional gas amount over chargeless length (g/m (oz/ft)) 20 (0.2)

Remarks for CU-2E18NBK

1. At least two indoor units must be connected.

2. The total nominal cooling capacity of indoor untis that will be connected to outdoor unit must be within connectable capacity range of indoor unit. (as shown in the table above) Example: The indoor units’ combination below is possible to connect to CU-2E18NBK. (Total nominal capacity of indoor units is between

5.6 kW to 6.4 kW)

1) Two CS-E9NKKW only. (Total nominal cooling capacity is 5.6 kW)

2) One CS-E9NKKW and one CS-E12NKKW. (Total nominal cooling capacity is 6.0 kW)

 Specifications are subject to change without notice for further improvement.

3.2 kW CS-E12NKKW

Note: “

• •

•” : Available

Outdoor Unit

CU-2E18NBK

Indoor unit combination Cooling Capacity (kW) Input Power (W)

Operation Class (kW)

One-room Operation

Two-room Operation

2.8 2.82 1.81 ~ 3.27 850 390 ~ 1020 4.5 4.1 0.5

3.2

2.8 + 2.8 4.89 2.09 ~ 5.86 1450 390 ~ 1920 7.6 6.9 0.5 + 0.5

2.8 + 3.2 4.89 2.10 ~ 5.86 1450 390 ~ 1870 7.6 6.9 0.5 + 0.6

3.2 + 3.2

Operation

Mode

Cooling

Rating Min ~ Max Rating Min ~ Max

3.21 1.85 ~ 3.75 1000 390 ~ 1230 5.2 4.7 0.6

4.89 2.10 ~ 5.86 1450 390 ~ 1840 7.6 6.9 0.6 + 0.6

Outdoor Unit

CU-2E18NBK

Indoor unit combination Cooling Capacity (BTU/h) Input Power (W)

Operation Class (kW)

One-room Operation

Two-room Operation

2.8 9600 6200 ~ 11200 850 390 ~ 1020 4.5 4.1 1.1

3.2

2.8 + 2.8 16700 7100 ~ 20000 1450 390 ~ 1920 7.6 6.9 1.1 + 1.1

2.8 + 3.2 16700 7200 ~ 20000 1450 390 ~ 1870 7.6 6.9 1.1 + 1.3

3.2 + 3.2

Operation

Mode

Cooling

Rating Min ~ Max Rating Min ~ Max

10900 6300 ~ 12800 1000 390 ~ 1230 5.2 4.7 1.3

16700 7200 ~ 20000 1450 390 ~ 1840 7.6 6.9 1.3 + 1.3

 Specifications are subject to change without notice for further improvement.

Outdoor Unit

CU-2E18NBK

Indoor unit combination Heating Capacity (kW) Input Power (W)

Operation Class (kW)

One-room Operation

Two-room Operation

2.8 4.02 1.87 ~ 4.61 1150 440 ~ 1450 5.9 5.4

3.2

2.8 + 2.8 5.94 2.09 ~ 7.20 1850 420 ~ 2310 9.0 8.1

2.8 + 3.2 5.94 2.10 ~ 7.20 1850 420 ~ 2290 9.0 8.1

3.2 + 3.2

Operation

Mode

Heating

Rating Min ~ Max Rating Min ~ Max

4.50 1.91 ~ 5.12 1300 440 ~ 1630 6.6 6.0

5.94 2.11 ~ 7.20 1850 420 ~ 2290 9.0 8.1

Outdoor Unit

CU-2E18NBK

Indoor unit combination Heating Capacity (BTU/h) Input Power (W)

Operation Class (kW)

One-room Operation

Two-room Operation

2.8 13700 6400 ~ 15700 1150 440 ~ 1450 5.9 5.4

3.2

2.8 + 2.8 20200 7100 ~ 24600 1850 420 ~ 2310 9.0 8.1

2.8 + 3.2 20200 7200 ~ 24600 1850 420 ~ 2290 9.0 8.1

3.2 + 3.2

Operation

Mode

Heating

Rating Min ~ Max Rating Min ~ Max

15300 6500 ~ 17500 1300 440 ~ 1630 6.6 6.0

20200 7200 ~ 24600 1850 420 ~ 2290 9.0 8.1

 Specifications are subject to change without notice for further improvement.

Current (A)

208V

Current (A)

208V

Current (A)

230V

Current (A)

230V

Current (A)

208V

Current (A)

208V

Moisture Removal

Volume

(L/h)

Moisture Removal

Volume

(pt/h)

Current (A)

230V

Current (A)

230V

3. Dimensions

4. Refrigeration Cycle Diagram

5. Block Diagram

6. Wiring Connection Diagram

7. Electronic Circuit Diagram

8. Printed Circuit Board

8.1 Main Printed Circuit Board

8.2 Noise Filter Printed Circuit Board

8.3 Display Printed Circuit Board

9. Installation Information

9.1 Check Points

QUICK GUIDE PIPING AND ELECTRICAL SPECIFICATION

Min.

Indoor (ID) & Outdoor (OD) units: Possible Combination Patterns

Outdoor (OD): CU-2E18NBK Indoor (ID): 2 UNITS OF CS-E9NKKW Outdoor (OD): CU-2E18NBK Indoor (ID): 2 UNITS OF CS-E12NKKW Outdoor (OD): CU-2E18NBK Indoor (ID): 1 UNIT OF CS-E9NKKW + 1 UNIT OF CS-E12NKKW

Refrige-

rant

R410A

Piping size

Gas Liquid

Ø3/8”

(Ø9.52mm)

Ø1/4”

(Ø6.35mm)

Max.

pipe

Standard

pipe

length

7.5 m 15 m 3m 25 m 50 m 20 m 20 g/m

Max.

Eleva-

tion

length

for

each

ID unit

from

OD to

each

unit

Max.

total

length

Min. total

pipe

length

for

additional

gas

Addi-

tional

refrige-

rant

Power supply

208/230V

60 Hz

MCA20A

MOP 25A

Power supply

wire size

AWG12 AWFG16

OD-ID

connection

wire size

Example:

If total piping length of all installed indoor units is at 22.5m, the quantity of additional refrigerant should be 50 g ......

(22.5 - 20) m x 20 g/m = 50 g

10. Installation Instruction

10.1 Select The Best Location

10.1.1 Outdoor Unit

 If an awning is built over the unit to prevent direct

sunlight or rain, be careful that heat radiation from the condenser is not obstructed.

 There should not be any animal or plant which

could be affected by hot air discharged.

 Keep the spaces indicated by arrows from wall,

ceiling, fence or other obstacles.

 Do not place any obstacles which may cause a

short circuit of the discharged air.

 Recommended installation height for outdoor unit

should be above the seasonal snow level.

Refrigerant piping size

Outdoor Unit CU-2E18***

Liquid - side ø1/4” (ø6.35mm) t0.8mm

Gas - side ø3/8” (ø9.52mm) t0.8mm

Outdoor Unit CU-2E18***

Min. total piping length for additional gas 20m

 If total piping length of all indoor units exceeds the

minimum length listed above, additionally charge with 20g of refrigerant (R410A) for each additional meter of piping.

Allowable piping length

Outdoor Unit CU-2E18***

Allowable piping length of each indoor unit (min. ~ max.) 3 m ~ 25 m

Allowable total piping length of all indoor unit 50 m or less

Height difference between indoor and outdoor unit

Height difference between indoor unit

Outdoor unit located on upper side

Outdoor unit located otherwise

Outdoor unit located on upper side

Outdoor unit located otherwise

15 m or less

7.5 m or less

15 m or less

Outdoor Unit Installation Guidelines

 Where a wall or other obstacle is in the path of outdoor unit’s intake or exhaust airflow, follow the installation

guidelines below.

 For any of the below installation patterns, the wall height on the exhaust side should be 1200mm or less.

10.2 Install The Outdoor Unit

 After selecting the best location, start installation

to Indoor/Outdoor Unit Installation Diagram. 1 Fix the unit on concrete or rigid frame firmly

and horizontally by bolt nut (ø10 mm).

2 When installing at roof, please consider strong

wind and earthquake. Please fasten the installation stand firmly with bolt or nails.

10.3 Connect the Piping

 Remove the control board cover (resin) from the

unit by loosening three screws

Connecting The Piping To Outdoor Unit

Decide piping length and then cut by using pipe cutter. Remove burrs from cut edge. Make flare after inserting the flare nut (locate at valve) onto the copper pipe. Align center of piping to valves and then tighten with torque wrench to the specified torque as stated in the table.

Model A B C D

CU-2E18*** 613 mm 131 mm 16 mm 360.5 mm

Do not over tighten, over tightening may cause gas leakage

Piping size Torque

1/4" [6.35 mm] [18 N•m (1.8 kgf.m)]

3/8" [9.52 mm] [42 N•m (4.3 kgf.m)]

1/2" [12.7 mm] [55 N•m (5.6 kgf.m)]

5/8" [15.88 mm] [65 N•m (6.6 kgf.m)]

3/4" [19.05 mm] [100 N•m (10.2 kgf.m)]

CUTTING AND FLARING THE PIPING

1 Please cut using pipe cutter and then remove the burrs. 2 Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused.

Turn the piping end down to avoid the metal powder entering the pipe.

3 Please make flare after inserting the flare nut onto the copper pipes.

10.4 Evacuation of the Equipment

WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedure.

1 Connect a charging hose with a push pin to

the Low side of a charging set and the service port of the 3-way valve. o Be sure to connect the end of the

charging hose with the push pin to the service port.

2 Connect the center hose of the charging set to

a vacuum pump.

3 Turn on the power switch of the vacuum pump

and make sure that the needle in the gauge moves from 0 cmHg (0 MPa) to -76 cmHg (-0.1 MPa). Then evacuate the air approximately ten minutes.

4 Close the Low side valve of the charging set

and turn off the vacuum pump. Make sure that the needle in the gauge does not move after approximately five minutes. Note: BE SURE TO TAKE THIS

PROCEDURE IN ORDER TO AVOID REFRIGERENT GAS LEAKAGE.

5 Disconnect the charging hose from the

vacuum pump and from the service port of the 3-way valve.

6 Tighten the service port caps of gas side

3-way valve at a torque of 18 N•m with a torque wrench.

7 Remove the valve caps of both of the gas side

and liquid side 3-way valve. Position both of the valves to “OPEN” using a hexagonal wrench (4 mm).

8 Mount valve caps onto the gas side and liquid

side of the 3-way valve. o Be sure to check for gas leakage.

 If gauge needle does not move from 0 cmHg (0 MPa) to -76 cmHg (-0.1 MPa), in step e above take the following measure:

- If the leak stops when the piping connections are tightened further, continue working from step e.

- If the leak does not stop when the connections are retightened, repair location of leak.

- Do not release refrigerant during piping work for installation and reinstallation.

- Take care of the liquid refrigerant, it may cause frostbite.

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