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

© Panasonic HA Air-Conditioning (M) Sdn. Bhd. 2011.
Unauthorized copying and distribution is a violation of law.

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

2

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.

3

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.

4

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)

5

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

6

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

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

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

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

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

7

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

8.1 Main Printed Circuit Board

13

8.2 Noise Filter Printed Circuit Board

8.3 Display Printed Circuit Board

14

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

ID

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

15

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

7.5 m or less

15 m or less

16

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)]

17

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.

18

10.5 Connect The Cable To The Outdoor Unit

1 Remove Control Board Cover (Metal) by

loosening 2 screws.

2 Remove Valve Cover (Metal) by loosening

2 screws.
3 Remove Plugs.
4 Fix the conduit connectors to the knock out

holes with lock-nuts, then secure them.
5 Connecting wire between indoor unit and

outdoor unit should be UL listed or CSA

approved 4 conductor wires minimum AWG16

in accordance with local electric codes.
6 Wire Connection to the power supply

(208/230V 60Hz) through circuit breaker.

o Connect the UL listed or CSA approved

wires minimum AWG12 to the terminal
board, and connect to other end of the
wires to circuit breaker.

7 Connect the power supply cord and

connecting wires between indoor unit and

outdoor unit according to the diagram as

shown.

8 For wire stripping and connection requirement, refer to the diagram below.
9 Secure the power supply cord and connecting cables onto the control board with the holder.
10 Attach the control board cover (metal and resin) and valve cover back to the original position with screw.

This equipment must be properly earthed.

 Earth wire shall be Yellow/Green (Y/G) in colour and longer than other AC wires for safety reason.

10.6 Heat Insulation

Use a material with good heat-resistant properties as the heat insulation for the
pipes. Be sure to insulate both the gas-side and liquid-side pipes. If the pipes are
not adequately insulated, condensation or water leakages may occur.

19

Liquid-side pipes

Gas-side pipes

Material shall
withstand
120°C or higher

11. Operation Control

11.1 Cooling Operation

11.1.1 Outdoor fan control

 When cooling operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted

according to figure below:

11.1.2 Annual Cooling control

 This control is to enable cooling operation when outdoor ambient temperature is low.
 Control start conditions:

o Cooling operation is activated with compressor ON.
o Outdoor ambient temperature is less than 15°C

 Control contents:

o When the above conditions are fulfilled, based on outdoor pipe temperature, the outdoor fan motor will

operate according to figure below:

 To improve the judgment accuracy during annual cooling control, outdoor ambient temperature sampling for

2 minutes will be activated every 35 minutes under designated fan speed.

 Control stop conditions:

o When either one of the start conditions are not complied.

20

11.2 Heating Operation

11.2.1 Outdoor fan control

 When heating operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted

according to figure below:

 To improve the judgment accuracy, indoor room temperature sampling starts when any indoor unit has stopped

capability supplied (heating thermo-off) during heating operation with compressor ON, outdoor unit will send
signal to all thermo-off indoor units to ON fan motor and get room temperature sample.

 To prevent discharge temperature drop at indoor units which is ON when sampling the room temperature of

heating thermo-off units, the outdoor fan speed will be adjusted accordingly.

 However, if indoor room temperature is high compare to remote control setting temperature, sampling of

corresponding indoor unit will be cancelled.

11.2.2 Powerful Operation 1

 During cooling operation, this control is to concentrate outdoor unit capability to the powerful operation enabled

indoor unit by temporary stop the capability supply to low load demand indoor units.

 Operation start condition:

o Powerful operation ON for targeted indoor unit

 Operation content:

o If other indoor units (where Powerful operation are OFF) achieve setting temperature continuously for

1 minute after received powerful command from indoor unit, then capability supply to other indoor units are

stopped for minimum 3 minutes.

Capability supply stop period follows powerful operation period.

 Operation stops when comply either one of the following conditions:

o When other indoor units (where Powerful operation are OFF) is lower than setting temperature.
o When the powerful operation is OFF for all indoor units.
o When Quiet operation received from 1 indoor unit.
o When protection control starts.

11.2.3 Powerful Operation 2

 During cooling / heating operation, this control is to provide fast cooling / heating operation compare to normal

operation.

 Operation start if all condition below are complied:

o Powerful operation ON for indoor unit.
o Not under Annual Cooling control.

 Operation content:

o Outdoor fan speed will adjust automatically.
o Compressor frequency will adjust automatically.

 Operation stop when comply either one of the follow conditions:

o When the powerful operation is OFF for all indoor units.
o When annual cooling control activated.

21

12. Simultaneous Operation Control

1 Operation modes which can be selected

using the remote control unit:

Automatic, Cooling, Soft Dry, Heating, e-ion
operation mode.

2 Types of operations modes which can be

performed simultaneously

o Cooling operation and cooling, Soft Dry

or e-ion operation

o Heating operation and heating operation

3 Types of operation modes which cannot be

performed simultaneously

o While a cooling operation is in progress,

a heating operation cannot be performed
by an indoor unit in another room.
In the room where the operation button
for cooling was pressed first, the
operation is continued. In the room where
the operation button for heating was
pressed afterward, the operation lamp of
the indoor unit blinks, where the attempt
is made to establish the heating
operation. Its fan is stopped, and the air
does not discharged.

o While a heating operation is in progress,

a cooling operation cannot be performed
by an indoor unit in another room.
In the room where the operation button
for heating was pressed first, the
operation is continued. In the room where
the operation button for cooling was
pressed afterward, the operation lamp of
the indoor unit blinks, where the attempt
is made to establish the cooling operation.
Its fan is stopped, and the air does not
discharged.

4 Operation mode priority control

o The operation mode designated first by

the indoor unit has priority.

o If the priority indoor unit stops operation

or initiates the e-ion operation, the priority
is transferred to other indoor units.

22

13. Protection Control

13.1 Freeze Prevention control (Cool)

 When received freeze prevention signal from indoor unit, the compressor frequency changes according to indoor

heat exchanger temperature.

 When indoor unit request capability OFF due to freeze condition , immediately the capability supply to targeted

indoor unit stops.

13.2 Dew Prevention control (Cool)

 When received dew prevention signal from indoor unit, the compressor frequency changes according to indoor

intake temperature and indoor heat exchanger temperature.

13.3 Electronic Parts Temperature Rise Protection 1 (Cool)

 This control prevents electronic parts temperature rise during cooling overload condition.
 Start conditions:

o Outdoor ambient temperature is at protection region as shown in figure below:

o Outdoor unit total current is above 5.5A

 Control content

o Outdoor fan speed is adjusted accordingly.

 Control stop condition

o When outdoor ambient temperature is back to normal region.

 During this control, outdoor fan speed does not reduce for Quiet operation.

13.4 Electronic Parts Temperature Rise Protection 2 (Cool)

 This control prevents electronic parts temperature rise during cooling/dry operation.
 Start conditions:

o Total current is at protection region as shown in figure below:

 Control content

o Outdoor fan speed is adjusted accordingly.

 Control stop conditions

o When total current is back to normal region.

 During this control, outdoor fan speed does not reduce for Quiet operation.

23

13.5 Cooling overload control (Cool)

 This control detect outdoor pipe temperature and perform the compressor frequency restriction during cooling

operation.

13.6 Heating overload control (Heat)

 This control detect indoor pipe temperature and perform the compressor frequency restriction during heating

operation.

 This control detect outdoor ambient temperature and perform the fan speed adjustment during heating operation.

13.7 Extreme Low Temperature Compressor low pressure protection control
(Heat)

 This control is to prevent low pressure drops too low during extremely low outdoor ambient temperature to

improve the compressor reliability.

 During heating operation, when outdoor ambient temperature is in Zone 1, this control will be activated.

Compressor frequency restriction will be based on outdoor piping temperature.

24

13.8 Deice Control

 When outdoor pipe temperature and outdoor air temperature is low, deice operation starts where indoor fan

motor and outdoor fan motor stop, indoor unit horizontal vane close and operation LED blink with compressor ON.

13.9 Time Delay Safety Control (Restart Control)

 The compressor will not restart within three minutes after compressor is stopped.
 This control is not applicable if the power supply reset or after deice condition.

13.10 30 seconds Force Operation

 Once the compressor starts operation, it will not stop its operation for 30 seconds in order to cycle back

compressor oil.

 However, it can be stopped using remote control or Auto OFF/ON button at indoor unit.

13.11 Total Current Control

 By referring to table below, during normal (default) operation, the running current refer to Hi values and during

Power Save Mode, the running current refer to Lo values.

 When the outdoor unit total running current (AC) exceeds X value, compressor frequency will decrease.
 If the running current does not exceed X value for 5 seconds, compressor frequency will increase.
 However, if total outdoor unit running current exceeds Y value, compressor will be stopped immediately for

3 minutes.

Operation Mode

Cooling/Soft Dry (A)

Cooling/Soft Dry (B)

Heating

X (A) Y (A)

Hi 14.0 17.5

Lo 9.8 17.5

Hi 14.0 17.5

Lo 9.8 17.5

Hi 14.0 17.5

Lo 9.8 17.5

CU-2E18NBK

13.12 IPM (power transistor) Protection Control

 Overheating Prevention Control

o If IPM temperature rises to 80°C, outdoor fan speed will be increased.
o When the IPM temperature rises to 95°C, compressor operation will stop immediately.
o Compressor operation restarts when temperature decreases to 90°C.
o If IPM temperature detected less than -30°C, IPM is judged as open circuit (“F96” is indicated).

 DC peak current control

o When IPM DC current exceeds set value of 30.0 ± 3.0 A, the compressor will stop.
o If the DC peak current detected within 30 seconds after operation starts, compressor will restart after

1 minute.

o If the DC peak current detected 30 seconds or more after operation starts, compressor will restart after

2 minutes.

o Within 30 seconds after compressor restarts, if the DC peak current is exceeded set value continuously for 7

times, all indoor and outdoor relays will be cut off (“F99” is indicated).

 Error reset can be done by power supply reset.

25

13.13 Compressor Protection Control (Gas leak detection control 1)

 Control start conditions

o For 5 minutes, the compressor continuously operates and total current is low.
o During Cooling or Soft Dry operation:

Indoor intake temperature — indoor piping temperature is below 4°C.

o During Heating operation:

Indoor pipe temperature — indoor intake temperature is below 3°C.

o Not during deice control.
o Compressor ON with maximum frequency.

 Control content

o Compressor stops (and restart after 3 minutes)
o If the conditions above happen 4 times within 60 minutes, the unit will stop operation (“F91” is indicated).

13.14 Compressor Protection Control (Gas leak detection control 2)

 This control detect gas leakage condition to prevent compressor damage.
 Control start condition

o All connected indoor units capability supply ON.
o Compressor ON with maximum frequency.
o Not during annual cooling.
o Compressor discharge temperature high.

 Control content

o Compressor OFF during this control (“F91” is memorized in EEPROM)
o If the above conditions happen 2 times within 60 minutes, indoor units’ Timer LED will blinks (“F91” is

indicated at all indoor units)

13.15 Valve close detection control

 This control detects 3-way valve close condition to prevent damage to refrigerant cycle.
 Start conditions:

o For all connected indoor units, if Indoor intake temperature — indoor piping temperature are between -2°C

and 2°C continuously for 5 minutes after compressor ON at first cooling operation.

o The first cooling operation is defined as cooling operation is ON for less than 8 minutes after new installation

or after pump down.

 Control content

o During this control, compressor stop, indoor units’ Timer LED will blink. (“F91” is indicated at indoor units)

 Error reset can be done by power supply reset or reset by using remote control.

13.16 Compressor discharge high pressure protection control

 This control protect by using high pressure switch during operation.
 Start conditions

o High pressure switch is activated (from normally close to open) when outdoor operation mode is cooling or

heating during compressor running.

 Control 1 content

o Compressor stop when high pressure switch is opened and restart after high pressure switch closed. If this

condition happen 4 times within 30 minutes, “F94” is indicated.

o After 30 minutes, counter is reset if this condition does not happen for 4 times.

 Control 1 stop conditions

o Power supply reset
o Reset by using remote control

26

14. Servicing Mode

14.1 CU-2E18NBK

14.1.1 Pump down operation (SW1)

 Operate the pump down process according to the following procedure

o Confirm the valve on the liquid side and gas side are open.
o Press PUMP DOWN button (SW1) on the Service PCB inside the outdoor unit for more than 5 seconds.

Pump down (cooling) operation is performed for 15 minutes.

o Set the liquid side 3 way valve to close position and wait until the pressure gauge indicates 0.01Mpa

(0.1kg/cm

o Immediate set the gas side valve to close position and then press the PUMP DOWN button (SW1) to stop the

pump down operation.
NOTE: Pump down operation will stop automatically after 15 minutes if PUMP DOWN switch (SW1) is not
pressed again. Pump down operation is not started within 3 minutes after compressor is stopped.

LED 2 3 4 5 Message

Status

Pump down operation end

: Flashing

2

G).

Pump down operation in progress

3 minutes before operation end

2 minutes before operation end

1 minute before operation end

14.1.2 Test Run operation

 Test operation can be carried out using TEST OPERATION button (SW2) on the Service PCB inside the outdoor

unit.

 For Cooling test, press the TEST OPERATION button (SW2) for 5 seconds or more but less than 10 seconds,

LED1 and LED 2 will illuminate when shift into cooling test operation.

 For Heating test, press the TEST OPERATION button (SW2) for more than 10 seconds, LED 1 and LED 3 will

illuminate when shift into heating test operation.

 Press the TEST OPERATION button (SW2) again to cancel test operation.

27

14.1.3 Wiring Error check

 The unit capable to correct the wiring error automatically by following procedures.

o Confirm the valve on the liquid side and gas side is open.
o Press WIRING CHECK button (SW3) on the Service PCB inside the outdoor unit for more than 10 seconds

to start wiring check operation.

o Wiring check process will complete in approximately 10 minutes. However, wiring check operation will not

start within 3 minutes after compressor is stopped. When outdoor air temperature is less than 5°C or unit has
abnormality, wiring check will not start. (See NOTE 2)

 The LED 2 to LED 6 in Service PCB inside the outdoor unit indicate the possibility of the correction as shown in

the table below:

LED 2 3 4 5 6 Message

Room A B - - -

All flashing Automatic correction impossible

LED2, 4, 6 and LED 3, 5

alternatively flashing

Flashing one after

Status

another

Other than above Unit has abnormality (NOTE 4)

 If automatic correct is impossible, check the

indoor unit wiring and piping manually.

NOTE:

1 For two rooms connection, LED 4 and 5 are not illuminated after wiring operation complete.
2 If the outdoor air temperature is less than 5°C or unit has abnormality, wiring operation will not start.
3 After wiring check operation is complete, LED indication will illuminated until normal operation starts.
4 Follow the product diagnosis procedure.
5 When LED 1 only illuminate, indicates that outdoor unit is operating normally.

Wiring check in progress

Automatic correction completed

14.1.4 Power Save Mode

 Power Save Mode can be enabled by pushing POWER SAVE switch (SW4) to ON before power supply ON.
 When Power Save Mode is ON, the unit can be operate at lower running current where the breaker capacity not

achieve the requirement.

14.1.5 Mode priority function

 Mode priority function can be enabled by pushing MODE PRIORITY switch (SW5) to ON before power supply

ON.

 When Mode Priority Function is ON, the mode priority is given to higher capacity indoor units.

14.1.6 Cooling only function

 The unit capable to limit the operation mode to Cooling Mode only (Heating mode disabled) by cutting JP1

(COOL ONLY) before power supply ON.

 This function prevent wrong operation during the unit installed in server room.
 This function could be disabled again by short the JP1 (COOL ONLY) before power supply ON.

28

15. Troubleshooting Guide

15.1 Self Diagnosis Function

 The display screen of wireless remote control unit and the self-diagnosis LEDs (green) on the outdoor printed

circuit board in the outdoor unit can be used to identify the location of the problem.
Refer to the table below to identify and solve the cause of the problem, and then re-start the air conditioner
system.

 If the problem is solved and operation returns to normal.

LED 1 illuminates and others LED are off.

29

30

31

16. Disassembly and Assembly Instructions

High Voltage are generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding
with repair work. Failure to heed this caution may result in electric shocks.

16.1 Outdoor Unit Removal Procedure

Caution! When handling electronic controller, be careful of electrostatic discharge.

16.1.1 Removing the Cabinet Top Plate and Cabinet Front Plate

1 Remove the cabinet top plate (remove the

8 screws).

2 Remove the 8 screws (1 on the center, 3 at

the top and 4 at the bottom) securing the
cabinet front plate, release the 2 hooks
(1 each at the left and right), and pull the
cabinet front plate toward front side.

WARNING

16.1.2 Remove the Control Board Cover and Particular Plates

3 Remove the control board cover (remove

3 screws).

4 Remove the particular plate (remove

2 screws).

5 Remove the particular plate (remove

2 screws).

32

16.1.3 Removing the Control P.C. Board

6 Remove the drip proof cover.
7 Disconnect the connectors (lead wires of the

compressor, sensor, and others).
8 Remove the screw at the right side of the

control box, and pull out the entire control box.
9 Release the control P.C. Board tab to remove

the control P.C. Board.

16.1.4 Removing the Propeller Fan and Fan Motor

1 Follow the steps in 16.1.1 for removing the

cabinet top plate and cabinet front plate.
2 Remove the propeller fan by removing the nut

turning clockwise at its center.

33

3 Disconnect the fan motor connector from the

control P.C. Board.

4 Loosen the 4 fan motor mounting screws then

remove the fan motor.

34

17. Technical Data

)

)

17.1 Operation Characteristics

17.1.1 One Indoor Unit Operation

 Cooling Characteristic

[Condition] Room temperature: 27°C (DBT), 19°C (WBT)
Operation condition: High fan speed
Piping Length: 7.5m
Compressor Freq: Fc

A) Indoor unit capacity: Cooling (2.8: CS-E9NKKW), service mode frequency = 28Hz

208 230

15.800

15.300

14.800

14.300

Outlet Air

13.800

Temperatur e (°C

13.300

12.800
16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

3.900

3.700

3.500

3.300

3.100

Cooling

2.900

Capacity ( kW)

2.700

2.500

2.300

16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

5.100

4.600

4.100

3.600

(A)

Current

3.100

2.600

2.100

16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

1.060

1.040

1.020

1.000

0.980

0.960

Gas Side Piping

Pressure (MPa

0.940

0.920

16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

35

 Cooling Characteristic

)
)

[Condition] Room temperature: 27°C (DBT), 19°C (WBT)
Operation condition: High fan speed
Piping Length: 7.5m
Compressor Freq: Fc

B) Indoor unit capacity: Cooling (3.2: CS-E12NKKW), service mode frequency = 33Hz

208 230

15.400

14.900

14.400

13.900

13.400

Outlet Air

12.900

Temperatur e (°C

12.400

11.900
16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

4.200

4.000

3.800

3.600

3.400

Cooling

3.200

Capacity ( kW)

3.000

2.800

2.600

16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

6.100

5.600

5.100

4.600

(A)

4.100

Current

3.600

3.100

2.600

16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

1.000

0.980

0.960

0.940

0.920

Gas Side Piping

Pressure (MPa

0.900

0.880

16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

36

 Piping Length Characteristic Cooling

)

)

[Condition] Room temperature: 27°C (DBT), 19°C (WBT)
Operation condition: High fan speed
Outdoor temperature: 35°C (DBT)
Compressor Freq: Fc

A) Indoor unit capacity: Cooling (2.8: CS-E9NKKW), service mode frequency = 28Hz

208 230

15.400

15.200

15.000

14.800

Outlet Air

14.600

Temperature ( °C

14.400

14.200
3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

3.000

2.900

2.800

Coolin g

2.700

Capacity ( kW)

2.600

2.500

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

0.980

0.970

0.960

Gas Side Piping

Pres sur e (MPa

0.950

0.940

3 4 5 6 7 8 9 10111213141516171819 20212223 2425

Piping Length (m)

4.000

3.900

3.800

3.700

(A)

Current

3.600

3.500

3.400

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

37

 Piping Length Characteristic Cooling

)

)

[Condition] Room temperature: 27°C (DBT), 19°C (WBT)
Operation condition: High fan speed
Outdoor temperature: 35°C (DBT)
Compressor Freq: Fc

B) Indoor unit capacity: Cooling (3.2: CS-E12NKKW), service mode frequency = 33Hz

208 230

14.700

14.500

14.300

14.100

13.900

Outlet Air

13.700

Temperature ( °C

13.500

13.300
3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

3.350

3.250

3.150

3.050

2.950

Coolin g

Capacity ( kW)

2.850

2.750

2.650

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

0.970

0.950

0.930

0.910

Gas Side Piping

Pres sur e (MPa

0.890

0.870

3 4 5 6 7 8 9 10111213141516171819 20212223 2425

Piping Length (m)

4.700

4.600

4.500

4.400

(A)

4.300

Current

4.200

4.100

4.000

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

38

 Heating Characteristic

)
)

[Condition] Room temperature: 20°C (DBT)
Operation condition: High fan speed
Piping Length: 7.5m
Compressor Freq: Fh
Heating overload protection: 38Hz (Outside air 24°C)

A) Indoor unit capacity: Heating (2.8: CS-E9NKKW), service mode frequency = 52Hz

208 230

45.000

43.000

41.000

39.000

37.000

Outlet Air

35.000

Temperatur e (°C

33.000

31.000

-15 -13 -11 -9 -7 -5 - 3 -1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

4.300

3.800

3.300

Heating

2.800

Capacity ( kW)

2.300

1.800

-15 -13 -11 -9 -7 -5 -3 - 1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

7.500

7.000

6.500

(A)

Current

6.000

5.500

5.000

-15 -13 -11 -9 -7 -5 -3 - 1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

1.100

1.000

0.900

0.800

0.700

0.600

Gas Side Piping

Pressure (MPa

0.500

0.400

0.300

-15 -13 -11 -9 -7 -5 -3 - 1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

39

 Heating Characteristic

)
)

[Condition] Room temperature: 20°C (DBT)
Operation condition: High fan speed
Piping Length: 7.5m
Compressor Freq: Fh
Heating overload protection: 44Hz (Outside air 24°C)

B) Indoor unit capacity: Heating (3.2: CS-E12NKKW), service mode frequency = 52Hz

208 230

43.000

41.000

39.000

37.000

Outlet Air

35.000

Temperatur e (°C

33.000

31.000

-15-13-11-9 -7 -5 -3 -1 1 3 5 7 9 1113151719212325

Outdoor Air Temperature (°C)

5.000

4.500

4.000

3.500

Heating

3.000

Capacity ( kW)

2.500

2.000

-15 -13 -11 -9 -7 -5 -3 - 1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

8.000

7.500

7.000

6.500

(A)

Current

6.000

5.500

5.000

-15 -13 -11 -9 -7 -5 -3 - 1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

0.900

0.800

0.700

0.600

0.500

Gas Side Piping

Pressure (MPa

0.400

0.300

-15-13-11-9 -7 -5 -3 -1 1 3 5 7 9 1113 151719212325

Outdoor Air Temperature (°C)

40

 Piping Length Characteristic Heating

)

)

[Condition] Room temperature: 20°C (DBT)
Operation condition: High fan speed
Outdoor temperature: 8.3°C (DBT), 6.1°C (WBT)
Compressor Freq: Fh

A) Indoor unit capacity: Heating (2.8: CS-E9NKKW), service mode frequency = 52Hz

208 230

44.600

44.100

43.600

43.100

42.600

Outlet Air

42.100

Temperature ( °C

41.600

41.100
3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

4.200

4.100

4.000

3.900

Heating

3.800

Capacity ( kW)

3.700

3.600

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

0.747

0.746

0.745

Gas Side Piping

Pres sur e (MPa

0.744

0.743

3 4 5 6 7 8 9 10111213141516171819 20212223 2425

Piping Length (m)

7.900

7.700

7.500

7.300

(A)

Current

7.100

6.900

6.700

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

41

 Piping Length Characteristic Heating

)

)

[Condition] Room temperature: 20°C (DBT)
Operation condition: High fan speed
Outdoor temperature: 8.3°C (DBT), 6.1°C (WBT)
Compressor Freq: Fh

B) Indoor unit capacity: Heating (3.2: CS-E12NKKW), service mode frequency = 52Hz

208 230

44.000

43.000

42.000

41.000

Outlet Air

Temperature ( °C

40.000

39.000
3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

4.600

4.500

4.400

4.300

4.200

Heating

Capacity ( kW)

4.100

4.000

3.900

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

0.737

0.736

0.735

Gas Side Piping

Pres sur e (MPa

0.734

0.733

3 4 5 6 7 8 9 10111213141516171819 20212223 2425

Piping Length (m)

7.800

7.600

7.400

7.200

(A)

7.000

Current

6.800

6.600

6.400

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

42

17.1.2 Two Indoor Unit Operation

)
)

 Cooling Characteristic

[Condition] Room temperature: 27°C (DBT), 19°C (WBT)
Operation condition: High fan speed
Piping Length: 7.5m
Compressor Freq: Fc

A) Indoor unit capacity: Cooling (2.8 + 2.8: CS-E9NKKW + CS-E9NKKW), service mode frequency = 48Hz

208 230

15.800

15.300

14.800

Outlet Air

Temperatur e (°C

14.300

13.800
16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

6.600

6.100

5.600

Cooling

5.100

Capacity ( kW)

4.600

4.100

16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

8.300

7.800

7.300

6.800

6.300

(A)

5.800

Current

5.300

4.800

4.300

3.800

16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

1.070

1.050

1.030

1.010

Gas Side Piping

Pressure (MPa

0.990

0.970

16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

43

 Cooling Characteristic

)
)

[Condition] Room temperature: 27°C (DBT), 19°C (WBT)
Operation condition: High fan speed
Piping Length: 7.5m
Compressor Freq: Fc

B) Indoor unit capacity: Cooling (3.2 + 3.2: CS-E12NKKW + CS-E12NKKW), service mode frequency = 46Hz

208 230

16.700

16.200

15.700

15.200

Outlet Air

14.700

Temperatur e (°C

14.200

13.700
16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

6.200

5.700

5.200

Cooling

Capacity ( kW)

4.700

4.200

16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

8.700

7.700

6.700

(A)

Current

5.700

4.700

3.700

16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

1.110

1.090

1.070

1.050

1.030

Gas Side Piping

Pressure (MPa

1.010

0.990

16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

Outdoor Air Temperature (°C)

44

 Cooling Characteristic

[Condition] Room temperature: 27°C (DBT), 19°C (WBT)
Operation condition: High fan speed
Piping Length: 7.5m
Compressor Freq: Fc

C) Indoor unit capacity: Cooling (2.8 + 3.2: CS-E9NKKW + CS-E12NKKW), service mode frequency = 47Hz

45

 Piping Length Characteristic Cooling

)

)

[Condition] Room temperature: 27°C (DBT), 19°C (WBT)
Operation condition: High fan speed
Outdoor temperature: 35°C (DBT)
Compressor Freq: Fc

A) Indoor unit capacity: Cooling (2.8 + 2.8: CS-E9NKKW + CS-E9NKKW), service mode frequency = 48Hz

208 230

15.900

15.700

15.500

15.300

Outlet Air

Temperature ( °C

15.100

14.900
3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

5.300

5.200

5.100

5.000

4.900

Coolin g

Capacity ( kW)

4.800

4.700

4.600

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

1.020

1.010

1.000

Gas Side Piping

Pres sur e (MPa

0.990

0.980

3 4 5 6 7 8 9 10111213141516171819 20212223 2425

Piping Length (m)

7.000

6.900

6.800

6.700

6.600

(A)

6.500

Current

6.400

6.300

6.200

6.100

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

46

 Piping Length Characteristic Cooling

)

)

[Condition] Room temperature: 27°C (DBT), 19°C (WBT)
Operation condition: High fan speed
Outdoor temperature: 35°C (DBT)
Compressor Freq: Fc

B) Indoor unit capacity: Cooling (3.2 + 3.2: CS-E12NKKW + CS-E12NKKW), service mode frequency = 46Hz

208 230

16.400

16.200

16.000

15.800

15.600

15.400

Outlet Air

15.200

Temperature ( °C

15.000

14.800
3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

5.000

4.900

4.800

Coolin g

4.700

Capacity ( kW)

4.600

4.500

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

1.050

1.040

1.030

Gas Side Piping

Pres sur e (MPa

1.020

1.010

3 4 5 6 7 8 9 10111213141516171819 20212223 2425

Piping Length (m)

7.100

6.900

6.700

6.500

(A)

Current

6.300

6.100

5.900

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

47

 Piping Length Characteristic Cooling

[Condition] Room temperature: 27°C (DBT), 19°C (WBT)
Operation condition: High fan speed
Outdoor temperature: 35°C (DBT)
Compressor Freq: Fc

C) Indoor unit capacity: Cooling (2.8 + 3.2: CS-E9NKKW + CS-E12NKKW), service mode frequency = 47Hz

48

 Heating Characteristic

)
)

[Condition] Room temperature: 20°C (DBT)
Operation condition: High fan speed
Piping Length: 7.5m
Compressor Freq: Fh

A) Indoor unit capacity: Heating (2.8 + 2.8: CS-E9NKKW + CS-E9NKKW), service mode frequency = 65Hz

208 230

49.000

47.000

45.000

43.000

41.000

39.000

37.000

Outlet Air

35.000

Temperatur e (°C

33.000

31.000

29.000

-15 -13 -11 -9 -7 -5 - 3 -1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

8.100

7.100

6.100

Heating

5.100

Capacity ( kW)

4.100

3.100

-15 -13 -11 -9 -7 -5 -3 - 1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

10.800

10.300

9.800

9.300

8.800

(A)

8.300

Current

7.800

7.300

6.800

6.300

-15 -13 - 11 -9 - 7 - 5 -3 -1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

1.100

1.000

0.900

0.800

0.700

0.600

Gas Side Piping

Pressure (MPa

0.500

0.400

0.300

-15 -13 -11 -9 -7 -5 -3 - 1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

49

 Heating Characteristic

)
)

[Condition] Room temperature: 20°C (DBT)
Operation condition: High fan speed
Piping Length: 7.5m
Compressor Freq: Fh

B) Indoor unit capacity: Heating (3.2 + 3.2: CS-E12NKKW + CS-E12NKKW), service mode frequency = 63Hz

208 230

46.000

44.000

42.000

40.000

38.000

36.000

Outlet Air

34.000

Temperatur e (°C

32.000

30.000

28.000

-15 -13 -11 -9 -7 -5 - 3 -1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

9.100

8.100

7.100

6.100

Heating

5.100

Capacity ( kW)

4.100

3.100

-15 -13 -11 -9 -7 -5 -3 - 1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

10.000

9.500

9.000

8.500

8.000

(A)

Current

7.500

7.000

6.500

6.000

-15 -13 - 11 -9 - 7 - 5 -3 -1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

1.100

1.000

0.900

0.800

0.700

0.600

Gas Side Piping

Pressure (MPa

0.500

0.400

0.300

-15 -13 -11 -9 -7 -5 -3 - 1 1 3 5 7 9 11 13 15 17 19 21 23 25

Outdoor Air Temperature (°C)

50

 Heating Characteristic

[Condition] Room temperature: 20°C (DBT)
Operation condition: High fan speed
Piping Length: 7.5m
Compressor Freq: Fh

C) Indoor unit capacity: Heating (2.8 + 3.2: CS-E9NKKW + CS-E12NKKW), service mode frequency = 64Hz

51

 Piping Length Characteristic Heating

)

)

[Condition] Room temperature: 20°C (DBT)
Operation condition: High fan speed
Outdoor temperature: 8.3°C (DBT), 6.1°C (WBT)
Compressor Freq: Fh

A) Indoor unit capacity: Heating (2.8 + 2.8: CS-E9NKKW + CS-E9NKKW), service mode frequency = 65Hz

208 230

36.100

36.050

36.000

35.950

Outlet Air

Temperature ( °C

35.900

35.850
3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

6.100

6.000

5.900

Heating

Capacity ( kW)

5.800

5.700

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

0.708

0.707

0.706

Gas Side Piping

Pres sur e (MPa

0.705

0.704

3 4 5 6 7 8 9 10111213141516171819 20212223 2425

Piping Length (m)

8.600

8.400

8.200

(A)

Current

8.000

7.800

7.600

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

52

 Piping Length Characteristic Heating

)

)

[Condition] Room temperature: 20°C (DBT)
Operation condition: High fan speed
Outdoor temperature: 8.3°C (DBT), 6.1°C (WBT)
Compressor Freq: Fh

B) Indoor unit capacity: Heating (3.2 + 3.2: CS-E12NKKW + CS-E12NKKW), service mode frequency = 63Hz

208 230

34.800

34.600

34.400

34.200

Outlet Air

Temperature ( °C

34.000

33.800
3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

6.000

5.950

5.900

5.850

Heating

5.800

Capacity ( kW)

5.750

5.700

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

0.698

0.697

0.696

Gas Side Piping

Pres sur e (MPa

0.695

0.694

3 4 5 6 7 8 9 10111213141516171819 20212223 2425

Piping Length (m)

8.000

7.800

7.600

(A)

Current

7.400

7.200

7.000

3 4 5 6 7 8 9 10111213141516171819202122232425

Piping Length (m)

53

 Piping Length Characteristic Heating

[Condition] Room temperature: 20°C (DBT)
Operation condition: High fan speed
Outdoor temperature: 8.3°C (DBT), 6.1°C (WBT)
Compressor Freq: Fh

C) Indoor unit capacity: Heating (2.8 + 3.2: CS-E9NKKW + CS-E12NKKW), service mode frequency = 64Hz

54

18. Exploded View and Replacement Parts List

Note
The above exploded view is for the purpose of parts disassembly and replacement.
The non-numbered parts are not kept as standard service parts.

55

REF. NO. DESCRIPTION & NAME Q’TY CU-2E18NBK REMARK

1 BASE PAN ASS'Y 1 CWD52K1239A

2 SOUND-PROOF BOARD 1 CWH151230

3 FAN MOTOR BRACKET 1 CWD541127

4 SCREW-FAN MOTOR BRACKET 3 CWH551217

5 CONDENSER COMPLETE 1 CWB32C2905

6 FAN MOTOR 1 EHDS80CAC O

7 SCREW-FAN MOTOR 4 CWH551323

8 PROPELLER FAN 1 CWH00K1006

9 NUT - PROPELLER FAN 1 CWH561038J

10 COMPRESSOR 1 5KD184XAB21 O

11 PACKING 3 CWB81043

12 ANTI - VIBRATION BUSHING 3 CWH50055

13 NUT - COMPRESSOR 3 CWH561049

14 CRANKCASE HEATER 1 CWA341067

15 ACCUMULATOR 1 CWB131050

17 3-WAY VALVE (LIQUID) 2 CWB011601 O

18 3-WAY VALVE (GAS) 2 CWB011602 O

19 HOLDER COUPLING 1 CWH351170

20 STRAINER 1 CWB111062 O

21 STRAINER 2 CWB111063 O

22 EXPANSION VALVE 2 CWB051029 O

23 4-WAYS VALVE 1 CWB001057 O

24 DISCHARGE MUFFLER 1 CWB121042

25 PRESSURE SWITCH 1 CWA101007

26 FLARE NUT (1/4) 4 CWT251030

27 FLARE NUT (3/8) 4 CWT251031

28 SOUND PROOF MATERIAL 1 CWG302246

29 SOUND PROOF MATERIAL 1 CWG302520

30 SOUND PROOF MATERIAL 1 CWG302521

31 SOUND PROOF MATERIAL 1 CWG302522

32 SENSOR-COMPLETE 1 CWA50C2722 O

33 V-COIL COMPLETE (4-WAY VALVE) 1 CWA43C2392 O

34 V-COIL COMPLETE (EXPAND VALVE - WHITE) 1 CWA43C2381 O

35 V-COIL COMPLETE (EXPAND VALVE - YELLOW) 1 CWA43C2382 O

38 SENSOR-COMPLETE (DEF) 1 CWA50C2723 O

39 SENSOR-COMPLETE 1 CWA50C2710 O

40 SENSOR-COMPLETE (CN-TH4) 1 CWA50C2691 O

41 SENSOR-COMPLETE (CN-TH3) 1 CWA50C2692 O

42 HOLDER-SENSOR 3 CWH32074

43 ELECTRONIC CONTROLLER-MAIN 1 CWA73C4496R O

44 ELECTRONIC CONT.-NOISE FILTER 1 CWA745975 O

45 ELECTRONIC CONTROLLER-DISPLAY 1 CWA746115 O

47 REACTOR 1 G0C403J00001 O

48 TERMINAL BOARD ASS'Y (L, N) 1 CWA28K1195 O

49 TERMINAL BOARD ASS'Y (1, 2, 3) 2 CWA28K1196 O

50 CONTROL BOARD COVER (TOP) 1 CWH131333

51 CONTROL BOARD COVER 1 CWH131364

52 CABINET TOP PLATE 1 CWE031131A

53 CONTROL BOARD COVER COMPLETE 1 CWH13C1209

54 CABINET FRONT PLATE CO. 1 CWE06K1071

55 CABINET SIDE PLATE ( L ) 1 CWE041489A

56 CABINET SIDE PLATE ( R ) 1 CWE041499A

57 WIRE NET 1 CWD041128A

58 HANDLE 1 CWE161010

60 INSTALLATION INSTRUCTION 1 CWF615175

56

61 INSTALLATION INSTRUCTION 1 CWF615176

74 ACCESSORY CO. (DRAIN ELBOW) 1 CWG87C900

76 NUT - TERMINAL COVER 2 CWH7080300J

77 TERMINAL COVER 1 CWH171035

78 TUBE ASS'Y (LIQUID 1) 1 CWT026284

79 TUBE ASS'Y (LIQUID 2) 1 CWT026285

80 MANIFOLD TUBE ASS'Y (GAS) 1 CWT07K1522

81 CLIP FOR SENSOR HOLDER 4 CWH711010

82 BAG 1 CWG861154

83 BASE BOARD-COMPLETE 1 CWG62C1081

84 SHOCK ABSORBER - RIGHT 1 CWG712879

85 SHOCK ABSORBER - LEFT 1 CWG712880

86 C.C.CASE 1 CWG565609

(Note)

 All parts are supplied from PHAAM, Malaysia (Vendor Code: 00029488).
 “O” marked parts are recommended to be kept in stock.

[PHAAM] Printed in Malaysia

FB1111-0

57