Nobu NBL4-18IDU32 User manual

Wall Mounted Air-Conditioning Unit
English
NBL4-18IDU32 / NBL4-18ΟDU32
NBL4-24IDU32 / NBL4-24ΟDU32
MODELS
Wall Mounted Air-Conditioning Unit
Service Manual
Wall Mounted Air-Conditioning Unit

Service Manual

Service Manual
Table of Contents
Service Manual
Table of Contents
Table of Contents
Part Ⅰ: Technical Information.......................................................................1
1. Summary......................................................................................................................1
..........................................................................................................2
...........................................................................................................3
2.2 Operation Characteristic Curve ........................................................................................6
2.3 Capacity Variation Ratio According to Temperature ....................................................... ..6
2.4 Cooling and Heating Data Sheet in Rated Frequency .....................................................7
2.5 Noise Curve......................................................................................................................8
3. Outline Dimension Diagram.........................................................................................9
3.1 Indoor Unit........................................................................................................................9
3.2 Outdoor Unit ...................................................................................................................10
4. Refrigerant System Diagram....................................................................11
5. Electrical Part.........................................................................................................12
5.1 Wiring Diagram...............................................................................................................12
5.2 PCB Printed Diagram .....................................................................................................14
6. Function and Control......................................................................................16
6.1 Remote Controller Introduction.......................................................................................16
6.2 Preparation before operation..........................................................................................16
6.3 Introduction of operation function....................................................................................16
6.4 Introduction of special functions......................................................................................18
6.4 Brief Description of Modes and Functions......................................................................20
Part Ⅱ: Installation and Maintenance .................................................29
7. Notes for Installation and Maintenance..........................................29
8. Installation................................................................................................................33
8.1 Installation Dimension Diagram......................................................................................33
8.2 Installation Parts-checking ............................................................................................35
8.3 Selection of Installation Location....................................................................................35
8.4 Requirements for electric connection .............................................................................35
8.5 Installation of Indoor Unit................................................................................................35
8.6 Installation of Outdoor unit .............................................................................................38
8.7 Vacuum Pumping and Leak Detection ...........................................................................39
8.8 Check after Installation and Test operation ....................................................................39

Service Manual
Table of contents
Service Manual
Table of Contents
9. Maintenance............................................................................................................40
9.1 Malfunction Display of Indoor Unit..................................................................................40
9.2 Procedure of Troubleshooting ........................................................................................42
9.3 Troubleshooting for Normal Malfunction.........................................................................60
10. Exploded View and Parts List ..............................................................62
10.1 Indoor Unit....................................................................................................................62
10.2 Outdoor Unit .................................................................................................................66
11. Removal Procedure.......................................................................................70
11.1 Removal Procedure of Indoor Unit ...............................................................................70
11.2 Removal Procedure of Outdoor Unit ............................................................................75
Appendix:.........................................................................................................................86
Appendix 1: Reference Sheet of Celsius and Fahrenheit .....................................................86
......................................................................86
Appendix 3: Pipe Expanding Method ....................................................................................87
Appendix 4: List of resistance for Temperature Sensor.........................................................88

Technical Information 1
Service Manual
1
Technical Information
Service Manual
Part Ⅰ: Technical Information
Indoor Unit
NBL4-18IDU32
NBL4-24IDU32
1. Summary
Outdoor Unit
NBL4-24ΟDU32
NBL4-18ΟDU32
Remote Controller

Technical Information
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Service Manual
3
Technical Information
Service Manual
Parameter Unit Value
Model NBL4-18IDU32
Power
Supply
Rated Voltage V~ 220-240
Rated Frequency Hz 50
Phases 1
Power Supply Mode Outdoor
Cooling Capacity W 5130
Heating Capacity W 5280
Cooling Power Input W 1580
Heating Power Input W 1420
Cooling Current Input A 7.0
Heating Current Input A 6.3
Rated Input W 2300
Rated Current A 10.8
Air Flow Volume(SH/H/M//L/SL) m3/h 850/720/610/520/-
Dehumidifying Volume L/h 1.8
EER W/W 3.25
COP W/W 3.72
SEER W/W 6.1
SCOP(Average/Warmer/Colder) W/W 4.0/5.1/3.4
Application Area m223-34
Indoor
Unit
Indoor Unit Model NBL4-18IDU32
Fan Type
Fan Diameter Length(DXL) mm Ф106X706
Cooling Speed(SH/H/M//L/SL) r/min 1230/1130/1030/800/-
Heating Speed(SH/H/M//L/SL) r/min 1350/1200/1050/900/-
Fan Motor Power Output W 35
Fan Motor RLA A 0.35
Fan Motor Capacitor μF 2.5
Evaporator Form Aluminum Fin-copper Tube
Evaporator Pipe Diameter mm Ф7
mm 2-1.4
Evaporator Coil Length (LXDXW) mm 715X25.4X304.8
Swing Motor Model MP35CJ
Swing Motor Power Output W 2.5
Fuse Current A 3.15
Sound Pressure Level(SH/H/M//L/SL) dB (A) 49/44/39/34/-
Sound Power Level(SH/H/M//L/SL) dB (A) 59/54/49/44/-
Dimension (WXHXD) mm 970X300X224
Dimension of Carton Box (LXWXH) mm 1038X380X305
Dimension of Package(LXWXH) mm 1041X383X320
Net Weight kg 13.5
Gross Weight kg 16.5

Technical Information 3
Service Manual
4Technical Information
Service Manual
Outdoor
Unit
Outdoor Unit Model NBL4-18ΟDU32
Compressor Model QXF-B141ZF030A
Compressor Oil 68DA
Compressor Type Rotary
Compressor LRA. A 25
Compressor RLA A 6.5
Compressor Power Input W 1410
Compressor Overload Protector 1NT11L-6233/KSD115℃/HPC
115/95
Throttling Method Electron expansion valve
Set Temperature Range ºC 16~30
Cooling Operation Ambient Temperature
Range ºC -15~43
Heating Operation Ambient Temperature
Range ºC -15~24
Condenser Form Aluminum Fin-copper Tube
Condenser Pipe Diameter mm Φ7.94
mm 2-1.4
Condenser Coil Length (LXDXW) mm 742X38.1X550
Fan Motor Speed rpm 780
Fan Motor Power Output W 40
Fan Motor RLA A 0.62
Fan Motor Capacitor μF /
Outdoor Unit Air Flow Volume m3/h 2400
Fan Type
Fan Diameter mm Ф445
Defrosting Method Automatic Defrosting
Climate Type T1
Isolation I
Moisture Protection IPX4
Permissible Excessive Operating Pressure
for the Discharge Side MPa 4.3
Permissible Excessive Operating Pressure
for the Suction Side MPa 2.5
Sound Pressure Level (H/M/L) dB (A) 56/-/-
Sound Power Level (H/M/L) dB (A) 64/-/-
Dimension(WXHXD) mm 899X596X378
Dimension of Carton Box (LXWXH) mm 945X417X630
Dimension of Package(LXWXH) mm 948X420X645
Net Weight kg 39
Gross Weight kg 42
Refrigerant R32
Refrigerant Charge kg 0.9
Connection
Pipe
Connection Pipe Length m 5
Connection Pipe Gas Additional Charge g/m 16
Outer Diameter Liquid Pipe mm Ф6
Outer Diameter Gas Pipe mm Ф12
Max Distance Height m 10
Max Distance Length m 25
Note: The connection pipe applies metric diameter.
The above data is subject to change without notice. Please refer to the nameplate of the unit.

Technical Information
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Service Manual
5
Technical Information
Service Manual
Parameter Unit Value
Model NBL4-24IDU32
Power
Supply
Rated Voltage V~ 220-240
Rated Frequency Hz 50
Phases 1
Power Supply Mode Outdoor
Cooling Capacity W 6450
Heating Capacity W 6450
Cooling Power Input W 1950
Heating Power Input W 1735
Cooling Current Input A 8.4
Heating Current Input A 8.0
Rated Input W 3100
Rated Current A 13.04
Air Flow Volume(SH/H/M//L/SL) m3/h 1250/1050/950/850/-
Dehumidifying Volume L/h 2.0
EER W/W 3.3
COP W/W 3.71
SEER W/W 6.30
SCOP(Average/Warmer/Colder) W/W 4.0/5.1/3.3
Application Area m223-34
Indoor
Unit
Indoor Unit Model NBL4-24IDU32
Fan Type
Fan Diameter Length(DXL) mm Φ108X830
Cooling Speed(SH/H/M//L/SL) r/min 1250/1000/900/800/-
Heating Speed(SH/H/M//L/SL) r/min 1250/1000/900/850/-
Fan Motor Power Output W 35
Fan Motor RLA A 0.35
Fan Motor Capacitor μF 3
Evaporator Form Aluminum Fin-copper Tube
Evaporator Pipe Diameter mm Ф7
mm 2-1.4
Evaporator Coil Length (LXDXW) mm 845X25.4X342.9
Swing Motor Model MP35CJ
Swing Motor Power Output W 2.5
Fuse Current A 3.15
Sound Pressure Level(SH/H/M//L/SL) dB (A) 49/44/41/39/-
Sound Power Level(SH/H/M//L/SL) dB (A) 63/59/56/53/-
Dimension (WXHXD) mm 1078X325X246
Dimension of Carton Box (LXWXH) mm 1145X410X335
Dimension of Package(LXWXH) mm 1148X413X350
Net Weight kg 16.5
Gross Weight kg 20

Technical Information 5
Service Manual
6Technical Information
Service Manual
Outdoor
Unit
Outdoor Unit Model NBL4-24ΟDU32
Compressor Model QXFS-D23zX090A
Compressor Oil FW68DA
Compressor Type Rotary
Compressor LRA. A 25
Compressor RLA A 11.50
Compressor Power Input W 2400
Compressor Overload Protector 1NT11L-6233 or HPC115/95/ or
KSD115ºC
Throttling Method Electron expansion valve
Set Temperature Range ºC 16~30
Cooling Operation Ambient Temperature
Range ºC -15~43
Heating Operation Ambient Temperature
Range ºC -15~24
Condenser Form Aluminum Fin-copper Tube
Condenser Pipe Diameter mm Φ7
mm 2-1.4
Condenser Coil Length (LXDXW) mm 935X38.1X660
Fan Motor Speed rpm 800
Fan Motor Power Output W 60
Fan Motor RLA A 0.58
Fan Motor Capacitor μF /
Outdoor Unit Air Flow Volume m3/h 3200
Fan Type
Fan Diameter mm Ф520
Defrosting Method Automatic Defrosting
Climate Type T1
Isolation I
Moisture Protection IPX4
Permissible Excessive Operating Pressure
for the Discharge Side MPa 4.3
Permissible Excessive Operating Pressure
for the Suction Side MPa 2.5
Sound Pressure Level (H/M/L) dB (A) 58/-/-
Sound Power Level (H/M/L) dB (A) 68/-/-
Dimension(WXHXD) mm 963X700X396
Dimension of Carton Box (LXWXH) mm 1026X455X735
Dimension of Package(LXWXH) mm 1029X458X750
Net Weight kg 52.5
Gross Weight kg 57
Refrigerant R32
Refrigerant Charge kg 1.7
Connection
Pipe
Connection Pipe Length m 5
Connection Pipe Gas Additional Charge g/m 50
Outer Diameter Liquid Pipe mm Ф6
Outer Diameter Gas Pipe mm Ф16
Max Distance Height m 10
Max Distance Length m 25
Note: The connection pipe applies metric diameter.
The above data is subject to change without notice. Please refer to the nameplate of the unit.
5
Technical Information
Service Manual
Parameter Unit Value
Model L4VI32-24WiFiR
Power
Supply
Rated Voltage V~ 220-240
Rated Frequency Hz 50
Phases 1
Power Supply Mode Outdoor
Cooling Capacity W 6450
Heating Capacity W 6450
Cooling Power Input W 1950
Heating Power Input W 1735
Cooling Current Input A 8.4
Heating Current Input A 8.0
Rated Input W 3100
Rated Current A 13.04
Air Flow Volume(SH/H/M//L/SL) m3/h 1250/1050/950/850/-
Dehumidifying Volume L/h 2.0
EER W/W 3.3
COP W/W 3.71
SEER W/W 6.30
SCOP(Average/Warmer/Colder) W/W 4.0/5.1/3.3
Application Area m223-34
Indoor
Unit
Indoor Unit Model L4VI32-24WiFiR
Fan Type
Fan Diameter Length(DXL) mm Φ108X830
Cooling Speed(SH/H/M//L/SL) r/min 1250/1000/900/800/-
Heating Speed(SH/H/M//L/SL) r/min 1250/1000/900/850/-
Fan Motor Power Output W 35
Fan Motor RLA A 0.35
Fan Motor Capacitor μF 3
Evaporator Form Aluminum Fin-copper Tube
Evaporator Pipe Diameter mm Ф7
mm 2-1.4
Evaporator Coil Length (LXDXW) mm 845X25.4X342.9
Swing Motor Model MP35CJ
Swing Motor Power Output W 2.5
Fuse Current A 3.15
Sound Pressure Level(SH/H/M//L/SL) dB (A) 49/44/41/39/-
Sound Power Level(SH/H/M//L/SL) dB (A) 63/59/56/53/-
Dimension (WXHXD) mm 1078X325X246
Dimension of Carton Box (LXWXH) mm 1145X410X335
Dimension of Package(LXWXH) mm 1148X413X350
Net Weight kg 16.5
Gross Weight kg 20

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Technical Information
Service Manual
2.2 Operation Characteristic Curve
2.3 Capacity Variation Ratio According to Temperature
0 10 20 30 40 50 60 70 90 0 10 20 30 40 50 60 70 80 90 100
120
110
80
11
10
9
8
7
6
5
4
3
2
1
0
Compressor speed (rps)
)A(tner ruC
11
10
9
8
7
6
5
4
3
2
1
0
Compressor speed (rps)
)A(tner ruC
220V
230V
240V
220V
230V
240V
Conditions
Indoor: DB27°C/WB19°C
Outdoor: DB35°C/WB24°C
Indoor air flow: High
Pipe length: 5m
Conditions
Indoor: DB20°C/WB15°C
Outdoor: DB7°C/WB6°C
Indoor air flow: High
Pipe length: 5m
Cooling Heating
Cooling Heating
32 33 34 35 36 37 38 39 43 –15 –10 –5
40 41 42
100
105
95
90
85
80
75
70
65
60
55
50
110
100
90
80
70
60
50
40
0 57 1
0
Conditions
Indoor:DB27°C/WB19°C
Indoor air flow:Super High
Pipe length: 5m
Conditions
Indoor:DB20°C/WB15°C
Indoor air flow:Super High
Pipe length: 5m
Outdoor temp.(°C) Outdoor temp.(°C)
Capacity ratio (%)
Capacity ratio (%)
Cooling Heating
Heating operation ambient temperature range is -15°C~24°C

Technical Information 7
Service Manual
12 Technical Information
Service Manual
2.4 Cooling and Heating Data Sheet in Rated Frequency
Rated cooling
condition(°C)
(DB/WB) Model
Pressure of gas pipe
connecting indoor and
outdoor unit
Inlet and outlet pipe
temperature of heat
exchanger
Fan speed of
indoor unit
Fan speed of
outdoor unit
Compressor
frequency
(Hz)
Indoor Outdoor P (MPa) T1 (°C) T2 (°C)
27/19 35/24 18K 0.9 to 1.1 12 to 14 75 to 37 Super High High 52
24K 72
Rated heating
condition(°C)
(DB/WB) Model
Pressure of gas pipe
connecting indoor and
outdoor unit
Inlet and outlet pipe
temperature of heat
exchanger
Fan speed of
indoor unit
Fan speed of
outdoor unit
Compressor
frequency
(Hz)
Indoor Outdoor P (MPa) T1 (°C) T2 (°C)
20/- 7/6 18K 2.2 to 2.4 70 to 35 2 to 4 Super High High 65
24K 77
Instruction:
T1: Inlet and outlet pipe temperature of evaporator
T2: Inlet and outlet pipe temperature of condenser
P: Pressure at the side of big valve
Connection pipe length: 5m.
Cooling:
Heating:

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Technical Information
Service Manual
2.5 Noise Curve
Indoor side noise when blowing Outdoor side noise when blowing
Indoor fan motor rotating speed
Compressor frequency(Hz)
Noise/dB(A)
50
60
30
40
20
Low Middle High Super High
50
52
54
56
58
60
62
64
68
20 03045060708
090
Noise dB(A)
18K
24K
24K
18K

Technical Information 9
Service Manual
14 Technical Information
Service Manual
3. Outline Dimension Diagram
3.1 Indoor Unit
W
24K
18K
D
H
79
154
43
206 685 187
Φ70 Φ70
43
104 685 181
140
190
38
Φ55 Φ55
38
Model W
HD
18K970 30
02
24
24K1078 325246
Unit:m
m
13
Technical Information
Service Manual
2.5 Noise Curve
Indoor side noise when blowing Outdoor side noise when blowing
Indoor fan motor rotating speed
Compressor frequency(Hz)
Noise/dB(A)
50
60
30
40
20
Low Middle High Super High
50
52
54
56
58
60
62
64
68
20 03045060708
090
Noise dB(A)
18K
24K
24K
18K

Technical Information
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Service Manual
15
Technical Information
Service Manual
899
818
596
378
303
343
550
Unit:mm
340
963
700
396
890
560
364
Unit:mm
3.2 Outdoor Unit
18K
24K

Technical Information 11
Service Manual
16 Technical Information
Service Manual
4. Refrigerant System Diagram
Connection pipe specication:
Liquid pipe:1/4" (6mm)
Gas pipe:1/2" (12mm) 18K
Gas pipe:5/8" (16mm) 24K
Indoor unit Outdoor unit
COOLING
HEATING
4-Way valve
Discharge
Suction
Heat
exchanger
(evaporator)
Heat
exchanger
(condenser)
Valve
Valve
Liquid pipe
side
Gas pipe
side
Strainer Electric
expand
valve
Strainer
Compressor
Accumlator
15
Technical Information
Service Manual
899
818
596
378
303
343
550
Unit:mm
340
963
700
396
890
560
364
Unit:mm
3.2 Outdoor Unit
18K
24K

Technical Information
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Service Manual
20 Technical Information
Service Manual
These circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.
L4VO32-18, L4VO32-24
● Outdoor Unit
63610000218
17
Technical Information
Service Manual
5. Electrical Part
5.1 Wiring Diagram
●Indoor Unit
●Instruction
Symbol Symbol Color Symbol Symbol Color Symbol Name
WH White GN Green CAP Jumper cap
YE Yellow BN Brown COMP Compressor
RD Red BU Blue Grounding wire
YEGN Yellow/Green BK Black / /
VT Violet OG Orange / /
Note: Jumper cap is used to determine fan speed and the swing angle of horizontal lover for this model.
600007000688
NBL4-18IDU32, NBL4-24IDU32

Technical Information 13
Service Manual
20 Technical Information
Service Manual
These circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.
NBL4-18ΟDU32, NBL4-24ΟDU32
● Outdoor Unit
63610000218
17
Technical Information
Service Manual
5. Electrical Part
5.1 Wiring Diagram
●Indoor Unit
●Instruction
Symbol Symbol Color Symbol Symbol Color Symbol Name
WH White GN Green CAP Jumper cap
YE Yellow BN Brown COMP Compressor
RD Red BU Blue Grounding wire
YEGN Yellow/Green BK Black / /
VT Violet OG Orange / /
Note: Jumper cap is used to determine fan speed and the swing angle of horizontal lover for this model.
600007000688
L4VI32-18WiFiR, L4VI32-24WiFiR

Technical Information
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Service Manual
21
Technical Information
Service Manual
5.2 PCB Printed Diagram
Indoor Unit
12456
7
8
9
1011121314
3
● Top view
● Bottom view
No.Name
1
2
3
4Interface of health function
live wire
5Interface of up&down swing
motor
Interface of PG feedback
6
Neutral wire interface of cold
plasma(only for the mode
with this function)
7WIFI
8Temperature sensor
Wired controller
9
10 Interface of diaplay
11
12 Communication wire
Jumper cap
13 Live wire
14 Fuse
Neutral wire interface of
power supply
Interface of indoor fan

Technical Information 15
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22 Technical Information
Service Manual
Outdoor Unit
●Top view
●Bottom view
No. Name
1
2
3
4Interface of temperature sensor
5
6
7
8
9
10
11
12
123456 78910
11
12
13
14
15
Compressor three phase input
interface
Terminal of system high pressure
protection
Compressor overload protection
terminal
Terminal of electronic expansion
valve
Terminal for low pressure protection
Interface of fan
4-way valve terminal
2-way valve terminal
Terminal of compressor electric heater
Terminal of chassis electric heater
Live wire
13 Communication wire
14 Grounding wire
15 Neutral wire
21
Technical Information
Service Manual
5.2 PCB Printed Diagram
Indoor Unit
1 2 456
7
8
9
1011121314
3
● Top view
● Bottom view
No.Name
1
2
3
4Interface of health function
live wire
5Interface of up&down swing
motor
Interface of PG feedback
6
Neutral wire interface of cold
plasma(only for the mode
with this function)
7WIFI
8Temperature sensor
Wired controller
9
10 Interface of diaplay
11
12 Communication wire
Jumper cap
13 Live wire
14 Fuse
Neutral wire interface of
power supply
Interface of indoor fan

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Technical Information
Service Manual
27
Technical Information
Service Manual
6. Function and Control
6.1 Remote Controller Introduction
No. Button name Function
1 ON/OFF Turn on or turn off the unit
2 TURBO Set turbo function
3 MODE Set operation mode
4 Set up&down swing status
5 I FEEL Set I FEEL function
6 TEMP Switch temperature displaying type on the unit’s display
7 Set health function and air function
8 LIGHT Set light function
9 X-FAN Set X-FAN function
10 SLEEP Set sleep function
11 CLOCK Set clock of the system
12 TOFF Set timer off function
13 TON Set timer on function
14 Set left&right swing status
15 FAN Set fan speed
16 /Set temperature and time
6.2 Preparation before operation
When using the remote controller for the first time or after replacing the batteries,
please set the time of the system according to current time in the following steps:
(1). Pressing CLOCK button, is blinking.
(2). Pressing or button, the clock time will increase or decrease rapidly.
(3). Press CLOCK button again to confirm the time and return to display current time.
6.3 Introduction of operation function
(1). Selecting operation mode
In unit on status, press MODE button to select operation mode in following sequence:
(2). Setting temperature
In unit on status, press button to increase setting temperature and press button to decrease setting temperature. The
Note: Under auto mode, manual adjustment of temperature is not needed.
range of temperature is from 16ºC to 30ºC.
(3). Adjusting fan speed
In unit on status, press FAN button to adjust fan speed in following sequence:
Notes:
①.When operation mode changes, fan speed is memoried;
②.Under dry mode, fan speed is low and can not be adjusted.
(4). Setting swing function
Setting left&right swing
1). Under simple swing status, press button to adjust left&right swing status;