Cooper & Hunter NORDIC MULTI LIGHT Series User manual

OUTDOOR UNIT
NORDIC
COMMERCIAL SERIES
Thank you for choosing Cooper&Hunter air conditioner, please read this service manual
carefully before operation and retain it for future reference.
Service manual
Outdoor unit
Models:
CH-IU09NK4
CH-IU12NK4
CH-IU18NK4
CH-IU24NK4
CH-IU30NK4
CH-IU36NM4
CH-IU42NM4
CH-IU48NM4
CH-IU60NM4

CONTENTS
PRODUCT ...........................................................................................................................................................................3
1 MODELS LIST ............................................................................................................................................................3
1.1 Outdoor Unit............................................................................................................................................................3
2 PRODUCT DATA.........................................................................................................................................................4
2.1 Product Data of Indoor Unit . .............................................................................................................................4
2.2 Operation Range . ..................................................................................................................................................5
2.3 Electrical Data. .......................................................................................................................................................5
3 PIPING DIAGRAM .....................................................................................................................................................6
4 OUTDOOR UNIT INSTALLATION . . ......................................................................................................................7
4.1 Before Installation.............................................................................................................................................7
4.2 Installation Site..................................................................................................................................................7
4.3 Caution for Installation ....................................................................................................................................8
4.4 Dimension Data .................................................................................................................................................8
5 REFRIGERATION PIPING WORK . ........................................................................................................................9
5.1 Refrigeration Piping Work Procedures and Caution in Connecting..................................................9
5.2 Specification of Connection Pipe .. ...........................................................................................................14
6 ELECTRIC WIRING WORK....................................................................................................................................15
6.1 Wiring Precautions .........................................................................................................................................15
6.2 Electrical Wiring ..............................................................................................................................................15
7 TROUBLE TABLE....................................................................................................................................................18
7.1 Description of Drive Malfunction . ..............................................................................................................18
7.2 Troubleshooting Flow Chart of Drive Malfunction ................................................................................19
7.3 Interface.............................................................................................................................................................24
7.4 IPM, PFC Testing Method. ............................................................................................................................29
8 WIRING DIAGRAM..................................................................................................................................................31
8.1 Outdoor unit .....................................................................................................................................................31
9 DISASSEMBLY AND ASSEMBLY PROCEDURE OF MAIN PARTS . ............................................................35
9.1 Outdoor Unit.....................................................................................................................................................35
10 EXPLODED VIEWS AND SPARE PART LIST..................................................................................................41
10.1 Outdoor Unit...................................................................................................................................................41

3
PRODUCT
1 MODELS LIST
1.1 Outdoor Unit
Model Name
Power Supply
(V, Ph, Hz)
Appearance
CH-IU09NK4
220-240V~ 50Hz
CH-IU12NK4
220-240V~ 50Hz
CH-IU18NK4
220-240V~ 50Hz
CH-IU24NK4
220-240V~ 50Hz
CH-IU30NK4
220-240V~ 50Hz
CH-IU36NM4 380-415V 3N~ 50Hz
CH-IU42NM4 380-415V~ 3N 50Hz
CH-IU48NM4 380-415V 3N~ 50Hz
CH-IU60NM4
380-415V 3N~ 50Hz
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2 PRODUCT DATA
2.1 Product Data of Outdoor Unit
Model
CH-IU09NK4
CH-IU12NK4
CH-IU18NK4
CH-IU24NK4
Power Supply
-
220-240V~ 50Hz
Heat Exchange
-
Cross Fin Coil
Compressor
Type
-
Rotary
Rotary
Rotary
Rotary
Power Input
W
942
942
1440
2550
Refrigerant
Control - Electronic Expansion Valve
Outline Dimensions (W×H×D)
mm
850×540×320
850×540×320
955×700×395
980×790×425
Net Weight
kg
35
35
47
67
Piping
Connections
Liquid
Inch
Φ1/4
Φ1/4
Φ1/4
Φ3/8
Gas
Inch
Φ3/8
Φ3/8
Φ1/2
Φ5/8
Max. Length
m
20
20
20
30
Max. Height
m
15
15
15
15
Model
CH-IU30NK4
CH-IU36NM4
CH-IU42NM4
Power Supply
-
220-240V~ 50Hz
Heat Exchange
-
Cross Fin Coil
Compressor
Type
-
Rotary
Rotary
Rotary
Power Input
W
2550
4150
4150
Refrigerant
Control - Electronic Expansion Valve
Outline Dimensions (W×H×D)
mm
980×790×425
1105×1100×440
960×1350×410
Net Weight
kg
71
97
95
Piping
Connections
Liquid
Inch
Φ3/8
Φ3/8
Φ3/8
Gas
Inch
Φ5/8
Φ5/8
Φ5/8
Max. Length
m
30
30
30
Max. Height
m
15
15
15
380-415V 3N~ 50Hz
Rotary Rotary
4580 4580
960×1350×410 1085×1365×425
111 124
Φ3/8 Φ3/8
Φ5/8 Φ3/4
50 50
30 30
CH-IU48NM4 CH-IU60NM4

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2.2 Operation Range
Mode
Range of Outdoor Temperature
Cooling
-15-48
Heating
-20-24
2.3 Electrical Data
Table 1 Electrical Data of Outdoor Unit
Model
Compressor
Fan Motor
Fuse/Breaker
Capacity
Min.
Power
Supply
Cord
Power
Supply
Qty.
RLA
FLA
V/Ph/Hz
−
A
A
A
mm2
CH-IU09NK4
220,1,50
1
4.5
<1
13
1.5
CH-IU12NK4
220,1,50
1
4.5
<1
13
1.5
CH-IU18NK4
220,1,50
1
7.2
<1
16
1.5
CH-IU24NK4
220,1,50
1
11.5
<1
20
2.5
CH-IU30NK4
220,1,50
1
11.5
<1
20
2.5
CH-IU36NM4
380,3,50
1
8
<1
20
2.5
CH-IU42NM4
380,3,50
1
8
<1
20
2.5
CH-IU48NM4
380,3,50
1
8
<1
25
2.5
CH-IU60NM4
380,3,50
1
8
<1
25
2.5
Notes:
RLA: Rated load amperes
LRA: Locked rotor amperes
FLA: Full load current
①. Install the disconnect device with a contact gap of at least 3mm in all poles nearby the units
(Both indoor unit and outdoor unit).The appliance must be positioned so that the plug is
accessible.
②. The specifications of the breaker and power cable listed in the table above are determined based
on the maximum power (maximum amps) of the unit.
③.The specifications of the power cable listed in the table above are applied to the conduit-guarded
multi-wire copper cable (like, YJV copper cable, consisting of PE insulated wires and a PVC
cable jacket) used at 40°С and resistible to 90°С (see IEC 60364-5-52). If the working condition
changes, they should be modified according to the related national standard.
④. The specifications of the breaker listed in the table above are applied to the breaker with the
working temperature at 40°С. If the working condition changes, they should be modified according
to the related national standard.

6
3PIPING DIAGRAM
Figure 1
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4 OUTDOOR UNIT INSTALLATION
4.1 Before Installation
After receiving the machine, please check for any transport damage. If finding any surface or
internal damage, please immediately report to the transport company or equipment company in writing.
After receiving the machine, please check the unit and accessories in reference to the packing list.
Ensure that the model is correct and the machine is in good condition. Please also check if the
specification and quantity of accessory parts are correct.
Determine the correct handling route and methods, thus to avoid damaging the unit or causing
possible hazard. For the sake of protection and safety, it is suggested to move the unit with the
packaging box. Even though it is not permitted to do like this under special occasions, do not remove the
packaging box, thus to avoid loosening or falling during handling.
Confirm if the installing foundation is solid. When this unit is to be installed on the metal section of
the building, make sure that the electrical insulation must comply with applicable standards.
Ensure that the place of installation is far from the area where the inflammable or explosive
substances are stored, thus to avoid possible explosion or fire due to leakage.
4.2 Installation Site
WARNING!
①. Install the unit where it will not be tilted by more than 5°.
②. During installation, if the outdoor unit has to be exposed to strong wind, it must be fixed securely.
If possible, do not install the unit where it will be exposed to direct sunlight. (If necessary, install a
blind that does not interfere with the air flow.)
(1) Install the outdoor unit in a place where it will be free from being dirty or getting wet by rain as
much as possible.
(2) Install the outdoor unit where it is convenient to connect with the indoor unit.
(3) Install the outdoor unit where the condensate water can be drained out freely during heating
operation.
(4) Do not place animals and plants in the path of the warm air.
(5) Take the air conditioner weight into account and select a place where noise and vibration are
small.
(6) Install the outdoor unit where is capable of withstanding the weight of the unit and generates as
less noise and vibration as possible.
(7) Provide the space shown in Figure 3, so that the air flow is not blocked. Also for efficient
operation, leave three of four directions of peripheral constructions open.

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Figure 3
4.3 Caution for Installation
The outdoor unit shall be so installed that the air discharged out of the outdoor unit will not flow back
and that enough space shall be maintained around the machine for repair;
The installing position shall be in good ventilation, so that the machine can breathe and exhaust
enough air. Ensure that there is no obstruction at the inlet and outlet of the machine. If any, please
remove the obstructions blocking the air inlet and outlet.
If the outdoor unit is installed on concrete or solid ground, it shall be fixed by using M10 bolts and
nuts. And ensure that the machine is kept vertical and horizontal.
The outdoor unit must be lifted by using the designated lift hole. During lifting, take care to protect
the air conditioner and avoid knocking the metal parts, thus to prevent rusting in the future.
To meet the noise and vibration requirements, the outdoor unit shall be installed by using rubber
damping pad or spring damper.
To install the drainage pipe, please insert the drainage joint to the drainage hole on the outdoor
chassis and connect a drainage pipe on the drainage joint. (The installing height of outdoor unit shall be
at least 5cm if drainage joint is to be used).
To insert the pipe through the wall, the wall-cross tube must be installed.
The installing dimension shall comply with the installation requirements in these instructions. The
outdoor unit must be fixed at the installing position.
The installation shall be done by specialist technicians.
4.4 Dimension Data
Figure 4

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Table 3
Unit: mm
Item
Model
A
B
C
D
E
CH-IU09NK4
850
320
540
540
285
CH-IU18NK4
955
395
700
560
360
CH-IU24NK4
980
425
790
610
390
CH-IU30NK4
1105 440 1100 630 400
CH-IU36NM4
960 410 1350 570 375
CH-IU42NM4
CH-IU48NM4
1085
425
1365
620
395
5 REFRIGERATION PIPING WORK
5.1 Refrigeration Piping Work Procedures and Caution in
Connecting
5.1.1 Flare Processing
(1) Cut the connection pipe with the pipe cutter and remove the burrs.
(2) Hold the pipe downward to prevent cuttings from entering the pipe.
(3) Remove the flare nuts at the stop valve of the outdoor unit and inside the accessory bag of the
indoor unit, then insert them to the connection pipe, after that, flare the connection pipe with a
flaring tool.
(4) Check if the flare part is spread evenly and there are no cracks (see Figure 5).
Figure 5
CH-IU12NK4
CH-IU60NM4

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5.1.2 Bending Pipes
(1) The pipes are shaped by your hands. Be careful not to collapse them.
Figure 6
(2) Do not bend the pipes in an angle more than 90°.
(3) When pipes are repeatedly bent or stretched, the material will harden, making it difficult to bend
or stretch them any more.
Do not bend or stretch the pipes more than three times.
(4) When bending the pipe, do not bend it as is. The pipe will be collapsed. In this case, cut the
heat insulating pipe with a sharp cutter as shown in Figure 7, and bend it after exposing the
pipe. After bending the pipe as you want, be sure to put the heat insulating pipe back on the
pipe, and secure it with tape.
Figure 7
CAUTION!
①. To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of 150
mm or over.
②. If the pipe is bent repeatedly at the same place, it will break.
5.1.3 Connecting the Pipe at the Indoor Unit Side
Detach the caps and plugs from the pipes.
CAUTION!
①. Be sure to apply the pipe against the port on the indoor unit correctly. If the centering is improper,
the flare nut cannot be tightened smoothly. If the flare nut is forced to turn, the threads will be
damaged.
②. Do not remove the flare nut until the connection pipe is to be connected so as to prevent dust and
impurities from coming into the pipe system.

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When connecting the pipe to the unit or removing it from the unit, please do use both the spanner
and the torque wrench.( Figure 8)
When connecting, smear both inside and outside of the flare nut with refrigeration oil, screw it hand
tight and then tighten it with the spanner.
Refer to Table 4 to check if the wrench has been tightened properly (too tight would mangle the nut
and lead to leakage).
Examine the connection pipe to see if it leaks, then take the treatment of heat insulation, as shown
in the Figure 8.
Use the medium-sized sponge to insulate the coupler of the gas pipe.
Figure 8
Table 4 Flare nut tightening torque
Pipe Diameter
Tightening Torque
1/4〞(Inch)
15-30 (N·m)
3/8〞(Inch)
35-40 (N·m)
1/2〞(Inch)
45-50 (N·m)
5/8〞(Inch)
60-65 (N·m)
3/4〞(Inch)
70-75 (N·m)
7/8〞(Inch)
80-85 (N·m)
CAUTION!
Be sure to connect the gas pipe after connecting the liquid pipe completely.
5.1.4 Connecting the Pipe at the Outdoor Side Unit
Tighten the flare nut of the connection pipe at the outdoor unit valve connector. The tightening
method is the same as that as at the indoor side.

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Figure 9
5.1.5 Checking the Pipe Connections for Gas Leaking
For both indoor and outdoor unit side, check the joints for gas leaking by the use of a gas leakage
detector without fail when the pipes are connected.
5.1.6 Vacuum and Gas Leakage Inspection
CAUTION!
Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation! There is no
extra refrigerant in the outdoor unit for air purging!
5.1.6.1 Vacuum
(1) Remove the caps of the liquid valve, gas valve and also the service port.
(2) Connect the hose at the low pressure side of the manifold valve assembly to the service port of
the unit‟s gas valve, and meanwhile the gas and liquid valves should be kept closed in case of
refrigerant leak.
(3) Connect the hose used for evacuation to the vacuum pump.
(4) Open the switch at the lower pressure side of the manifold valve assembly and start the
vacuum pump. Meanwhile, the switch at the high pressure side of the manifold valve assembly
should be kept closed, otherwise evacuation would fail.
(5) The evacuation duration depends on the unit‟s capacity, generally, 15 minutes for the 09k/12k

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units, 20 minutes for the 18k units, 30 minutes for the 24/30/36k units, 45 minutes for the
42/48/60 units. And verify if the pressure gauge at the low pressure side of the manifold valve
assembly reads -1.0Mp (-75cmHg), if not, it indicates there is leak somewhere. Then, close the
switch fully and then stop the vacuum pump.
(6) Wait for some time to see if the system pressure can remain unchanged, 3 minutes for the units
less than 18k, 5 minutes for the 18k~24k units, 10 minutes for the units more than 42k. During
this time, the reading of the pressure gauge at the low pressure side can not be larger than
0.005Mp (0.38cmHg).
(7) Slightly open the liquid valve and let some refrigerant go to the connection pipe to balance the
pressure inside and outside of the connection pipe, so that air will not come into the connection
pipe when removing the hose. Note that the gas and liquid valve can be opened fully only after
the manifold valve assembly is removed.
(8) Place back the caps of the liquid valve, gas valve and also the service port.
Figure 11
Note: For the large-sized unit, it has the service port for both the gas valve and the liquid valve. During
evacuation, it is available to connect two hoses of the manifold valve assembly to two service ports to
quicken the evacuating speed.
When the height difference between the indoor unit and outdoor unit is larger than 10 meters, an
oil bend should be employed for every 6 meters.
Oil bend
Oil bend
Indoor
Outdoor
6m
Figure 12

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5.2 Specification of Connection Pipe
Table 5
Item
Model
Size of Fitting Pipe(Inch)
Max. Pipe
Length
(m)
Max. Height Difference
between Indoor Unit and
Outdoor Unit (m)
Drainage pipe(Outer
Diameter × wall thickness)
(mm)
Liquid
Gas
CH-IU09NK4
1/4
3/8
20
15
φ17×1.75
CH-IU12NK4
1/4
3/8
20
15
φ17×1.75
CH-IU18NK4
1/4
1/2
20
15
φ17×1.75
CH-IU24NK4
3/8
5/8
30
15
φ17×1.75
CH-IU30NK4
3/8
5/8
30
15
φ17×1.75
CH-IU36NM4
3/8
5/8
30
15
φ17×1.75
CH-IU42NM4
3/8
5/8
30
15
φ17×1.75
CH-IU48NM4
3/8
5/8
50
30
φ17×1.75
CH-IU60NM4
3/8
3/4
50
30
φ17×1.75
The connection pipe should be insulated with proper water-proof insulating material.
The pipe wall thickness shall be 0.5-1.0 mm and the pipe wall shall be able to with stand the
pressure of 6.0 MPa. The longer the connecting pipe, the lower the cooling and heating effect performs.

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6 ELECTRIC WIRING WORK
6.1 Wiring Precautions
WARNING!
①. Before obtaining access to terminals, all supply circuits must be disconnected.
②. The rated voltage of the unit is as shown as Table 1-4-1 and Table 1-4-2
③. Before turning on, verify that the voltage is within the 198~264V range (for single phrase unit) or
342~457V range (for three-phrase unit).
④. Always use a special branch circuit and install a special receptacle to supply power to the air
conditioner.
⑤. Use a special branch circuit breaker and receptacle matched to the capacity of the air conditioner.
⑥. The special branch circuit breaker is installed in the permanent wiring. Always use a circuit that
can trip all the poles of the wiring and has an isolation distance of at least 3 mm between the
contacts of each pole.
⑦. Perform wiring work in accordance with standards so that the air conditioner can be operated
safely and positively.
⑧. Install a leakage special branch circuit breaker in accordance with the related laws and regulations
and electric company standards.
CAUTION!
①. The power source capacity must be the sum of the air conditioner current and the current of other
electrical appliances. When the current contracted capacity is insufficient, change the contracted
capacity.
②. When the voltage is low and the air conditioner is difficult to start, contact the power company to
raise the voltage.
6.2 Electrical Wiring
(1) For solid core wiring (Figure 13)
(1) Cut the wire end with a wire cutter or wire-cutting pliers, and then strip the insulation about
25 mm (15/16").
(2) Using a screwdriver, remove the terminal screw(s) on the terminal board.
(3) Using pliers, bend the solid wire to form a loop suitable for the terminal screw.
(4) Shape the loop wire properly, place it on the terminal board and tighten securely with the
terminal screw using a screwdriver.
(2) For strand wiring (Figure 13)
(1) Cut the wire end with a wire cutter or wire-cutting pliers, and then strip the insulation about
10 mm (3/8").
(2) Using a screwdriver, remove the terminal screw (s) on the terminal board.
(3) Using a round terminal fastener or pliers, securely clamp a round terminal to each stripped
wire end.

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(4) Position the round terminal wire, and replace and tighten the terminal screw with a
screwdriver. (Figure 14)
Figure13
Figure 14 Figure 15
(3) How to fix connection cord and power cord by cord clamp
After passing the connection cord and power cord through the insulation tube, fasten it with the cord
clamp. (Figure 15)
WARNING!
①. Before starting work, check that power is not being supplied to the indoor unit and outdoor unit.
②. Match the terminal block numbers and connection cord colors with those of the indoor unit side.
③. Erroneous wiring may cause burning of the electric parts.
④. Connect the connection cords firmly to the terminal block. Imperfect installation may cause a fire.
⑤. Always fasten the outside covering of the connection cord with cord clamps. (If the insulator is not
clamped, electric leakage may occur.)
⑥. Always connect the ground wire.

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Electric wiring of outdoor unit side
Note: When connecting the power supply cord, make sure that the phase of the power supply
matches with the exact terminal board. If not, the compressor will rotate reversely and run improperly.
Remove the big handle (09~42K) /front board (48/60K) of the outdoor unit and insert the end of the
communication cord and the power cable into the terminal board.
Single phase:
Figure 16
Three-phase:
Figure 17

18
7.1 Description of Drive Malfunction
Main board dual 8 numeral tube Display Codes for Outdoor Unit of 09~48k
Malfunction Item
Indoor Unit Display
Outdoor unit display of
dual 8 numeral tube
DC busbar over-voltage protection
PH
PH
IPM or PFC over-temperature protection
P8
P8
Current sense circuit error
Pc
Pc
IPM or PFC temperature sensor error
P7
P7
Compressor current protection
P5
P5
DC busbar under-voltage protection
PL
PL
Compressor startup failure
Lc
Lc
Drive module reset
P0
P0
Compressor motor desynchronizing
H7
H7
Phase loss
Ld
Ld
Drive-to-main-control communication error
P6
P6
IPM protection
H5
H5
Compressor overload protection
H3
H3
AC current protection (input side)
PA
PA
Charging circuit error
PU
PU
PFC protection
HC(48K only)
HC(48K only)
DC fan error
H6
H6
Input AC voltage abnormality
PP
PP
Driving board memory chip error
ee(09-42K)
ee(09-42K)
7 TROUBLE TABLE
Table 6
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7.2 Troubleshooting Flow Chart of Drive Malfunction
Note: For Outdoor Unit Drive (Inverter) by Single-phase Motor
(Applicable to CH-IU09NK4/CH-IU12NK4/CH-IU18NK4/CH-IU24NK4/CH-IU30NK4)
 P0 Drive module reset
 P7 IPM or PFC temperature sensor error
 PA AC current protection (input side)
 PC Current sense circuit error
 HC PFC protection（48K only）

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 P8 IPM or PFC over-temperature protection
 PH DC busbar over-voltage protection
 PL DC busbar under-voltage protection