Cooper & Hunter CHML-U14NK2 User manual

Change for Life
Service Manual
Models: CHML-U14NK2
CHML-U18NK3
CHML-U21NK3
CHML-U24NK3
CHML-U28NK4
(Refrigerant:R410A)

Service Manual
Table of Contents
Table of Contents
Part Ⅰ: Technical Information...............................................................................1
1. Summary..............................................................................................................................1
2. Specications..................................................................................................................2
3. Outline Dimension Diagram..............................................................................12
4. Refrigerant System Diagram............................................................................14
5. Electrical Part.................................................................................................................15
5.1 Wiring Diagram.......................................................................................................................15
5.2 PCB Printed Diagram .............................................................................................................20
6. Function and Control..............................................................................................22
Part Ⅱ: Installation and Maintenance .........................................................25
7. Notes for Installation and Maintenance..................................................25
8. Installation Manual....................................................................................................27
8.1 Electrical Connections............................................................................................................28
8.2 Installing the Outdoor Unit......................................................................................................31
8.3 Installation Dimension Diagram..............................................................................................32
8.4 Check after Installation...........................................................................................................33
9. Maintenance....................................................................................................................34
9.1 Precautions before Performing Inspection or Repair .............................................................34
9.2 Flashing LED of Indoor/Outdoor Unit and Primary Judgement .............................................35
9.3 Malfunction Checking and Elimination ...................................................................................36
9.4 Maintenance Method for Normal Malfunction.........................................................................49
10. Exploded View and Parts List ......................................................................51
11. Removal Procedure...............................................................................................71
Appendix:................................................................................................................................90
Appendix 1: Reference Sheet of Celsius and Fahrenheit ............................................................90
Appendix 2: Conguration of Connection Pipe.............................................................................90
Appendix 3: Pipe Expanding Method ...........................................................................................91
Appendix 4: List of Resistance for Temperature Sensor ..............................................................92

1
Technical Information
Service Manual
1. Summary
Part Ⅰ: Technical Information
Outdoor Unit
CHML-U18NK3
CHML-U21NK3
CHML-U14NK2
CHML-U24NK3
CHML-U28NK4

2Technical Information
Service Manual
2. Specications
Model CHML-U14NK2(LCLH) CHML-U14NK2
Product Code CB228W06500 CB228W06501
Power
supply
Rated Voltage V~ 220-240 220-240
Rated Frequency Hz 50 50
Phases 1 1
Cooling capacity(max~min) W 4100(2052~4396) 4100(2052~4396)
Heating capacity(max~min) W 4400(2491~5422) 4400(2491~5422)
Cooling Power Input(max~min) W 1200 1200
Heating Power Input(max~min) W 1180 1180
Cooling Current Input A 5.32 5.32
Heating Current Input A 5.10 5.10
Rated Power Input W 1780 1780
Rated Current A 7.90 7.90
SEER W/W 6.10 6.10
SCOP W/W 4.00 4.00
Outdoor
Unit
Compressor Trademark ZHUHAI LANDA COMPRESSOR
CO.,LTD
ZHUHAI LANDA COMPRESSOR
CO.,LTD
Compressor Model QXA-B141zF030A QXA-B141zF030A
Compressor Refrigerant Oil Type RB68EP RB68EP
Compressor Type Inverter Rotary Inverter Rotary
L.R.A A 25 25
Compressor Rated Load Amp (RLA) A 7.2 7.2
Compressor Power Input W 1440 1440
Compressor Thermal Protector "1NT11L-6233
KSD115OCHPC115/95U1"
"1NT11L-6233
KSD115OCHPC115/95U1"
Throttling Method Electron expansion valve Electron expansion valve
Cooling Operation Ambient Temperature Range OC -15~43 18~43
Heating Operation Ambient Temperature Range OC -20~24 -15~24
Condenser Material Aluminum Fin-copper Tube Aluminum Fin-copper Tube
Condenser Pipe Diameter mm Φ9.52 Φ9.52
Rows-Fin Gap(mm) mm 2-1.4 2-1.4
Coil length (l) X height (H) X coil width (L) mm 800X44X559 800X44X559
Fan Motor Speed (rpm) (H/M/L) rpm 900 900
Output of Fan Motor W 30 30
Fan Motor RLA A / /
Fan Motor Capacitor μF / /
Air Flow Volume of Outdoor Unit m3/h 2600 2600
Fan Type-Piece Axial-ow Axial-ow
Fan Diameter mm Φ438-116 Φ438-116
Defrosting Method Automatic Defrosting Automatic Defrosting
Climate Type T1 T1
Isolation I I
Moisture Protection IP24 IP24
Permissible Excessive Operating Pressure for
the Discharge Side MPa 4.3 4.3
Permissible Excessive Operating Pressure for
the Suction Side MPa 2.5 2.5
Dimension (W/H/D) mm 903X596X378 903X596X378
Dimension of Package (L/W/H) mm 945X417X630 945X417X630
Dimension of Package(L/W/H) mm 948X420X645 948X420X645
Net Weight kg 43 43
Gross Weight kg 46 46
efrigerant Charge R410A R410A
Refrigerant Charge kg 1.40 1.40

3
Technical Information
Service Manual
Outdoor
Unit
Cross-sectional Area of Power Cable Conductor mm2/ /
Recommended Power Cable(Core) N 3 3
Connection Pipe Connection Method - Flare Connection Flare Connection
Not Additional Gas Connection Pipe Length m 10 10
Connection Pipe Gas Additional Charge g/m 20 20
Outer Diameter of Liquid Pipe(C&H Allocation)
(Metric) mm Φ6 Φ6
Outer Diameter of Gas Pipe(C&H Allocation)
(Metric) mm Φ9.52 Φ9.52
Outer Diameter of Liquid Pipe(C&H Allocation)
(Metric) mm Φ6 Φ6
Outer Diameter of Gas Pipe(C&H Allocation)
(Metric) mm Φ9.52 Φ9.52
Connection Pipe Max. Height Distance(indoor and
indoor) m 5 5
Max. equivalent connection pipe length(outdoor to
last indoor) m 10 10
Connection Pipe Max. Length Distance(total lenght) m 20 20
The above data is subject to change without notice; please refer to the nameplate of the unit.

4Technical Information
Service Manual
Model CHML-U18NK3(LCLH) CHML-U18NK3
Product Code CB228W06300 CB228W06301
Power
supply
Rated Voltage V~ 220-240 220-240
Rated Frequency Hz 50 50
Phases 1 1
Cooling capacity(max~min) W 5200(2140~5800) 5200(2140~5800)
Heating capacity(max~min) W 5400(2579~5920) 5400(2579~5920)
Cooling Power Input(max~min) W 1450 1450
Heating Power Input(max~min) W 1450 1450
Cooling Current Input A 6.88 6.88
Heating Current Input A 6.43 6.43
Rated Power Input W 1780 1780
Rated Current A 7.90 7.90
SEER W/W 6.1 6.1
SCOP W/W 4.0 4.0
Outdoor
Unit
Compressor Trademark ZHUHAI LANDA COMPRESSOR
CO.,LTD
ZHUHAI LANDA COMPRESSOR
CO.,LTD
Compressor Model QXA-B141zF030A QXA-B141zF030A
Compressor Refrigerant Oil Type RB68EP RB68EP
Compressor Type Inverter Rotary Inverter Rotary
L.R.A A 25 25
Compressor Rated Load Amp (RLA) A 7.2 7.2
Compressor Power Input W 1440 1440
Compressor Thermal Protector "1NT11L-6233
KSD115OCHPC115/95U1"
"1NT11L-6233
KSD115OCHPC115/95U1"
Throttling Method Electron expansion valve Electron expansion valve
Cooling Operation Ambient Temperature Range OC -15~43 18~43
Heating Operation Ambient Temperature Range OC -20~24 -15~24
Condenser Material Aluminum Fin-copper Tube Aluminum Fin-copper Tube
Condenser Pipe Diameter mm Φ7 Φ7
Rows-Fin Gap(mm) mm 2-1.4 2-1.4
Coil length (l) X height (H) X coil width (L) mm 851X38.1X660 851X38.1X660
Fan Motor Speed (rpm) (H/M/L) rpm 800 800
Output of Fan Motor W 60 60
Fan Motor RLA A / /
Fan Motor Capacitor μF / /
Air Flow Volume of Outdoor Unit m3/h 3 2 0 0 3 2 0 0
Fan Type-Piece Axial-ow Axial-ow
Fan Diameter mm Φ520-154 Φ520-154
Defrosting Method Automatic Defrosting Automatic Defrosting
Climate Type T1 T1
Isolation I I
Moisture Protection IP24 IP24
Permissible Excessive Operating Pressure for the
Discharge Side MPa 4.3 4.3
Permissible Excessive Operating Pressure for the
Suction Side MPa 2.5 2.5
Dimension (WXHXD) mm 963X700X396 963X700X396
Dimension of Package (LXWXH) mm 1026X455X735 1026X455X735
Dimension of Package(LXWXH) mm 1029X458X750 1029X458X750
Net Weight kg 51 51
Gross Weight kg 55 55
efrigerant Charge R410A R410A
Refrigerant Charge kg 1.60 1.60

5
Technical Information
Service Manual
The above data is subject to change without notice; please refer to the nameplate of the unit.
Outdoor
Unit
Cross-sectional Area of Power Cable Conductor mm2/ /
Recommended Power Cable(Core) N 3 3
Connection Pipe Connection Method - Flare Connection Flare Connection
Not Additional Gas Connection Pipe Length m 10 10
Connection Pipe Gas Additional Charge g/m 20 20
Outer Diameter of Liquid Pipe(C&H Allocation)
(Metric) mm Φ6 Φ6
Outer Diameter of Gas Pipe(C&H Allocation)
(Metric) mm Φ9.52 Φ9.52
Outer Diameter of Liquid Pipe(C&H Allocation)
(Metric) mm Φ6 Φ6
Outer Diameter of Gas Pipe(C&H Allocation)
(Metric) mm Φ9.52 Φ9.52
Connection Pipe Max. Height Distance(indoor and
indoor) m 5 5
Max. equivalent connection pipe length(outdoor to
last indoor) m 10 10
Connection Pipe Max. Length Distance(total lenght) m 20 20

6Technical Information
Service Manual
Model CHML-U21NK3(LCLH) CHML-U21NK3
Product Code CB228W06400 CB228W06401
Power
supply
Rated Voltage V~ 220-240 220-240
Rated Frequency Hz 50 50
Phases 1 1
Cooling capacity(max~min) W 6100(2198~7327) 6100(2198~7327)
Heating capacity(max~min) W 6500(3605~8499) 6500(3605~8499)
Cooling Power Input(max~min) W 1910 1910
Heating Power Input(max~min) W 1730 1730
Cooling Current Input A 8.47 8.47
Heating Current Input A 7.68 7.68
Rated Power Input W 2870 2870
Rated Current A 12.73 12.73
SEER W/W 6.1 6.1
SCOP W/W 4.0 4.0
Outdoor
Unit
Compressor Trademark ZHUHAI LANDA COMPRESSOR
CO.,LTD
ZHUHAI LANDA COMPRESSOR
CO.,LTD
Compressor Model QXAS-D23zX090B QXAS-D23zX090B
Compressor Refrigerant Oil Type RB68EP RB68EP
Compressor Type Inverter Rotary Inverter Rotary
L.R.A A 25 25
Compressor Rated Load Amp (RLA) A 11.5 11.5
Compressor Power Input W 2550 2550
Compressor Thermal Protector "1NT11L-6233KSD115OC
HPC115/95U1"
"1NT11L-6233KSD115OC
HPC115/95U1"
Throttling Method Electron expansion valve Electron expansion valve
Cooling Operation Ambient Temperature Range OC -15~43 18~43
Heating Operation Ambient Temperature Range OC -20~24 -15~24
Condenser Material Aluminum Fin-copper Tube Aluminum Fin-copper Tube
Condenser Pipe Diameter mm Φ9.52 Φ9.52
Rows-Fin Gap(mm) mm 2-1.4 2-1.4
Coil length (l) X height (H) X coil width (L) mm 851X38.1X660 851X38.1X660
Fan Motor Speed (rpm) (H/M/L) rpm 800 800
Output of Fan Motor W 60 60
Fan Motor RLA A / /
Fan Motor Capacitor μF / /
Air Flow Volume of Outdoor Unit m3/h 3 2 0 0 3 2 0 0
Fan Type-Piece Axial-ow Axial-ow
Fan Diameter mm Φ520-154 Φ520-154
Defrosting Method Automatic Defrosting Automatic Defrosting
Climate Type T1 T1
Isolation I I
Moisture Protection IP24 IP24
Permissible Excessive Operating Pressure for the
Discharge Side MPa 4.3 4.3
Permissible Excessive Operating Pressure for the
Suction Side MPa 2.5 2.5
Dimension (WXHXD) mm 963X700X396 963X700X396
Dimension of Package (LXWXH) mm 1026X455X735 1026X455X735
Dimension of Package(LXWXH) mm 1029X458X750 1029X458X750
Net Weight kg 62 62
Gross Weight kg 65.5 65.5
efrigerant Charge R410A R410A
Refrigerant Charge kg 2.2 2.2

7
Technical Information
Service Manual
The above data is subject to change without notice; please refer to the nameplate of the unit.
Outdoor
Unit
Cross-sectional Area of Power Cable Conductor mm2/ /
Recommended Power Cable(Core) N 3 3
Connection Pipe Connection Method - Flare Connection Flare Connection
Not Additional Gas Connection Pipe Length m 30 30
Connection Pipe Gas Additional Charge g/m 20 20
Outer Diameter of Liquid Pipe(C&H Allocation)
(Metric) mm Φ6 Φ6
Outer Diameter of Gas Pipe(C&H Allocation)
(Metric) mm Φ9.52 Φ9.52
Outer Diameter of Liquid Pipe(C&H Allocation)
(Metric) mm Φ6 Φ6
Outer Diameter of Gas Pipe(C&H Allocation)
(Metric) mm Φ9.52 Φ9.52
Outer Diameter of Liquid Pipe(C&H Allocation)
(Metric) mm Φ6 Φ6
Outer Diameter of Gas Pipe(C&H Allocation)
(Metric) mm Φ9.52 Φ9.52
Connection Pipe Max. Height Distance(indoor and
indoor) m 10 10
Max. equivalent connection pipe length(outdoor to
last indoor) m 20 20
Connection Pipe Max. Length Distance(total lenght) m 60 60

8Technical Information
Service Manual
Model CHML-U24NK3(LCLH) CHML-U24NK3
Product Code CB228W06600 CB228W06601
Power
supply
Rated Voltage V~ 220-240 220-240
Rated Frequency Hz 50 50
Phases 1 1
Cooling capacity(max~min) W 7100(2286~8499) 7100(2286~8499)
Heating capacity(max~min) W 8500(3664~8792) 8500(3664~8792)
Cooling Power Input(max~min) W 2180 2180
Heating Power Input(max~min) W 2280 2280
Cooling Current Input A 9.67 9.67
Heating Current Input A 10.12 10.12
Rated Power Input W 2870 2870
Rated Current A 12.73 12.73
SEER W/W 6.1 6.1
SCOP W/W 4.0 4.0
Outdoor
Unit
Compressor Trademark ZHUHAI LANDA COMPRESSOR
CO.,LTD
ZHUHAI LANDA COMPRESSOR
CO.,LTD
Compressor Model QXAS-D23zX090B QXAS-D23zX090B
Compressor Refrigerant Oil Type RB68EP RB68EP
Compressor Type Inverter Rotary Inverter Rotary
L.R.A A 25 25
Compressor Rated Load Amp (RLA) A 11.5 11.5
Compressor Power Input W 2550 2550
Compressor Thermal Protector "1NT11L-6233KSD115OC
HPC115/95U1"
"1NT11L-6233KSD115OC
HPC115/95U1"
Throttling Method Electron expansion valve Electron expansion valve
Cooling Operation Ambient Temperature Range OC -15~43 18~43
Heating Operation Ambient Temperature Range OC -20~24 -15~24
Condenser Material Aluminum Fin-copper Tube Aluminum Fin-copper Tube
Condenser Pipe Diameter mm Φ7 Φ7
Rows-Fin Gap(mm) mm 2-1.4 2-1.4
Coil length (l) X height (H) X coil width (L) mm 982.2X38.1X748 982.2X38.1X748
Fan Motor Speed (rpm) (H/M/L) rpm 800 800
Output of Fan Motor W 90 90
Fan Motor RLA A / /
Fan Motor Capacitor μF / /
Air Flow Volume of Outdoor Unit m3/h 3 2 0 0 3 2 0 0
Fan Type-Piece Axial-ow Axial-ow
Fan Diameter mm Φ520-120 Φ520-120
Defrosting Method Automatic Defrosting Automatic Defrosting
Climate Type T1 T1
Isolation I I
Moisture Protection IP24 IP24
Permissible Excessive Operating Pressure for the
Discharge Side MPa 4.3 4.3
Permissible Excessive Operating Pressure for the
Suction Side MPa 2.5 2.5
Dimension (WXHXD) mm 1001X790X427 1001X790X427
Dimension of Package (LXWXH) mm 1080X485X840 1080X485X840
Dimension of Package(LXWXH) mm 1083X488X855 1083X488X855
Net Weight kg 68 68
Gross Weight kg 73 73
efrigerant Charge R410A R410A
Refrigerant Charge kg 2.2 2.2