Fujitsu General ARXG45KHTB User manual

AIR CONDITIONER
Duct type
SERVICE MANUAL
INDOOR
ARXG45KHTB
ARXG54KHTB
OUTDOOR
AOHG45KRTA
AOHG54KRTA
SR_AR040EG_03
2022.04.07

Notices:
• Product specifications and design are subject to change without notice for future improvement.
• For further details, please check with our authorized dealer.
Trademarks
FGLair™ is trademark of Fujitsu General Limited in the United States, other countries or both.
Google Play™ is trademark of Google Inc.
App Store® is a service mark of Apple Inc., registered in the U.S. and other countries.
Copyright © 2022 Fujitsu General Limited. All rights reserved.

CONTENTS
1. GENERAL INFORMATION
2. TECHNICAL DATA AND PARTS LIST
3. TROUBLESHOOTING
4. CONTROL AND FUNCTIONS
5. FILED WORKING

1. GENERAL INFORMATION
2022.01.24
SR_CH01_AR040EG_01

CONTENTS
1. GENERAL INFORMATION
1. Specifications..............................................................................................01-1
1-1. Indoor unit ......................................................................................................................01-1
1-2. Outdoor unit....................................................................................................................01-2
2. Dimensions..................................................................................................01-3
2-1. Indoor unit ......................................................................................................................01-3
2-2. Outdoor unit....................................................................................................................01-5

1. Specifications
1-1. Indoor unit
Type Duct
Inverter heat pump
Model name ARXG45KHTB ARXG54KHTB
Power supply 3N 400 V ~ 50 Hz
Power supply intake Outdoor unit
Available voltage range 342—457 V
Capacity
Cooling
Rated kW 12.1 13.4
Btu/h 41,300 45,700
Min.—Max. kW 4.0—14.0 5.0—14.5
Btu/h 13,600—47,800 17,100—49,400
Heating
Rated kW 13.5 15.5
Btu/h 46,100 52,900
Min.—Max. kW 5.0—16.2 5.5—18.0
Btu/h 17,100—55,300 18,800—61,400
Input power
Cooling Rated
kW
4.16 4.77
Max. 5.22 5.59
Heating Rated 3.61 4.18
Max. 5.07 5.67
Current Cooling Rated A7.6 8.5
Heating Rated 6.8 7.6
Power factor Cooling %79.4 81.7
Heating 77.4 79.5
EER Cooling kW/kW 2.91 2.81
COP Heating 3.74 3.71
Moisture removal L/h (pints/h) 1.5 (2.6) 2.0 (3.5)
Maximum operating current*1Cooling A14
Heating 14
Fan
Airflow rate
Cooling
HIGH
m3/h
3,350
MED 2,850
LOW 2,430
Heating
HIGH 3,350
MED 2,850
LOW 2,430
Type × Q'ty Sirocco fan × 2
Motor output W 490
Static pressure range Pa 100 to 250
Sound pressure level*2
Cooling
HIGH
dB (A)
47
MED 43
LOW 40
Heating
HIGH 47
MED 43
LOW 40
Heat exchanger type
Dimensions (H × W × D) mm 336 × 890 × 53.2
Fin pitch 1.3
Rows × Stages 4 × 16
Pipe type Copper
Fin type Aluminum
Enclosure Material Steel sheet
Color ―
Dimensions
(H × W × D)
Net mm 400 × 1,050 × 500
Gross 460 × 1,230 × 640
Weight Net kg 46
Gross 51
Connection pipe Size Liquid mm (in) Ø9.52 (3/8)
Gas Ø15.88 (5/8)
Method Flare
Operation range Cooling °C 18 to 32
%RH 80 or less
Heating °C 16 to 30
Drain port Material Steel
Size mm Ø23.4 (I.D.), Ø25.4 (O.D.)
Remote control (Option) Wired remote controller, Wireless remote controller, Simple remote controller, IR Receiver
Unit, Mobile app*3 (FGLair™)
NOTES:
• Specifications are based on the following conditions:
– Cooling: Indoor temperature of 27 °CDB/19 °CWB, and outdoor temperature of 35 °CDB/24 °CWB.
– Heating: Indoor temperature of 20 °CDB/15 °CWB, and outdoor temperature of 7 °CDB/6 °CWB.
– Pipe length: 5 m, Height difference: 0 m. (Between outdoor unit and indoor unit.)
– Standard static pressure: 100 Pa
• Protective function might work when using it outside the operation range.
• *1: Maximum operating current is the total current of the indoor unit and the outdoor unit.
• *2: Sound pressure level:
– Measured values in manufacturer’s anechoic chamber.
– Because of the surrounding sound environment, the sound levels measured in actual installation conditions might be higher than the specified values here.
• *3: Available on Google Play™ store or on App Store®. Optional WLAN adapter is also required. For details, refer to the setting manual.
1-1. Indoor unit - (01-1) - 1. Specifications
GENERAL INFORMATION GENERAL INFORMATION

1-2. Outdoor unit
Type Inverter heat pump
Model name AOHG45KRTA AOHG54KRTA
Power supply 3N 400 V ~ 50 Hz
Power supply intake Outdoor unit
Available voltage range 342—457 V
Starting current A 7.6 8.5
Fan
Airflow rate Cooling m3/h 4,450
Heating 4,450
Type × Q'ty Propeller × 1
Motor output W 120
Sound pressure level *1 Cooling dB (A) 57
Heating 57 59
Sound power level Cooling dB (A) 71 73
Heating 71 73
Heat exchanger type
Dimensions
(H × W × D)
mm
Main1: 966 × 905 × 18.20
Main2: 966 × 905 × 18.20
Sub: 966 × 543 × 18.20
Fin pitch
Main1: 1.45
Main2: 1.45
Sub: 1.45
Rows × Stages
Main1: 1 × 46
Main2: 1 × 46
Sub: 1 × 46
Pipe type Copper
Fin Type (Material) Aluminum
Surface treatment Blue fin
Compressor Type DC Twin rotary
Motor output W 2,180
Refrigerant Type (Global warming potential) R32 (675)
Factory charge g 2,700
Refrigerant oil Type RmM68AF
Amount cm3800
Enclosure
Material Steel sheet
Color Beige
Approximate color of Munsell 10YR 7.5/1.0
Dimensions
(H × W × D)
Net mm 998 × 940 × 320
Gross 1,176 × 1,027 × 445
Weight Net kg 67
Gross 77
Connection pipe
Size Liquid mm (in) Ø 9.52 (3/8)
Gas Ø 15.88 (5/8)
Method Flare
Pre-charge length
m
30
Max. length 50
Max. height difference 30
Operation range Cooling °C -15 to 46
Heating -15 to 24
Drain hose Material LDPE
Tip diameter mm Ø 13.0 (I. D.), Ø 16.0 to Ø 16.7 (O. D.)
NOTES:
• Specifications are based on the following conditions:
– Cooling: Indoor temperature of 27 °CDB/19 °CWB, and outdoor temperature of 35 °CDB/24 °CWB.
– Heating: Indoor temperature of 20 °CDB/15 °CWB, and outdoor temperature of 7 °CDB/6 °CWB.
– Pipe length: 5.0 m, Height difference: 0 m. (Between outdoor unit and indoor unit.)
• Protective function might work when using it outside the operation range.
• *1: Sound pressure level
– Measured values in manufacturer’s anechoic chamber.
– Because of the surrounding sound environment, the sound levels measured in actual installation conditions might be higher than the specified values here.
• This data is based on EN 14511 standard.
1-2. Outdoor unit - (01-2) - 1. Specifications
GENERAL INFORMATION GENERAL INFORMATION

2. Dimensions
2-1. Indoor unit
¢Models: ARXG45KHTB and ARXG54KHTB
Unit: mm
Front view
Top view
Side view (L)
Side view (R)
Rear view
P5 ×120 = 600
585
85
P120 ×2 = 240
108
208
356
371
1,080
1,000
862
126
1,050
851
125
295 26
28
155
14
324
400
123
41
500
139
12-Φ3
Drain
port
71
88
2-1. Indoor unit - (01-3) - 2. Dimensions
GENERAL INFORMATION GENERAL INFORMATION

¢Installation space requirement
Provide sufficient installation space for product safety.
NOTE: The detailed component shape depends on the model.
Models: ARXG45KHTB and ARXG54KHTB
Installation by which service space is mode on top of the unit (recommended).
350 or
more
450 or more
(Service space)
Service access
Unit: mm
Installation by which service space is carried out from the bottom of the unit.
20 or
more
450 or more
(Service space)
Service access
Unit: mm
2-1. Indoor unit - (01-4) - 2. Dimensions
GENERAL INFORMATION GENERAL INFORMATION

2-2. Outdoor unit
¢Models: AOHG45KRTA and AOHG54KRTA
Unit: mm
Top view
Bottom view
Side viewFront view
940
998
266.7
Pipe & Cable port
Rear view
Ф28: Cable port
Pipe port
650
35.748
143147
39.8
53.9 Liquid
40 320
355
62.9 Gas
12.9
297.2
(Gas valve)
(Liquid valve)
Ф28
Cable port
1-1/8
(29)
Pipe port
23.4
129.1
85.3
50
29
Pipe port
A
95
89
A
3 Way valve
(Liquid)
3 Way valve
(Gas)
320
139.8
96
40 5
Ф28
Cable port
120
Pipe port
55
25
50
B
B
50
25
141.9 70
67 Pipe port
264.6
351.9
47.6
15.262.6
15.6
2-2. Outdoor unit - (01-5) - 2. Dimensions
GENERAL INFORMATION GENERAL INFORMATION

2-2. Outdoor unit - (01-6) - 2. Dimensions
GENERAL INFORMATION GENERAL INFORMATION

2. TECHNICAL DATA AND PARTS LIST
2022.04.07
SR_CH02_AR040EG_02

CONTENTS
2. TECHNICAL DATA AND PARTS LIST
1. Precautions..................................................................................................02-1
2. Indoor unit parts list....................................................................................02-2
2-1. Models: ARXG45KHTB and ARXG54KHTB...................................................................02-2
3. Outdoor unit parts list.................................................................................02-6
3-1. Models: AOHG45KRTA and AOHG54KRTA..................................................................02-6
4. Accessories ...............................................................................................02-10
4-1. Indoor unit ....................................................................................................................02-10
4-2. Outdoor unit..................................................................................................................02-10
5. Optional parts ...........................................................................................02-11
5-1. Indoor unit ....................................................................................................................02-11
5-2. Outdoor unit..................................................................................................................02-13
6. Refrigerant system diagrams...................................................................02-14
6-1. Models: AOHG45KRTA and AOHG54KRTA................................................................02-14
7. Wiring diagrams ........................................................................................02-15
7-1. Indoor unit ....................................................................................................................02-15
7-2. Outdoor unit..................................................................................................................02-16
8. PC board diagrams ...................................................................................02-17
8-1. Models: ARXG45KHTB and ARXG54KHTB.................................................................02-17
8-2. Models: AOHG45KRTA and AOHG54KRTA................................................................02-18

1. Precautions
When you start servicing, pay attention to the following points. For detailed precautions, refer to the
installation manual of the products.
CAUTION
• Service personnel
– Any person who is involved with working on or breaking into a refrigerant circuit should hold a
current valid certificate from an industry-accredited assessment authority, which authorizes
their competence to handle refrigerants safely in accordance with an industry recognized as-
sessment specification.
– Servicing shall only be performed as recommended by the equipment manufacturer. Mainte-
nance and repair requiring the assistance of other skilled personnel shall be carried out under
the supervision of the person competent in the use of flammable refrigerants.
– Servicing shall be performed only as recommended by the manufacturer.
• Work
– Prior to beginning work on systems containing flammable refrigerants, safety checks are nec-
essary to ensure that the risk of ignition is minimized. When repairing the refrigerant system,
refer to the precautions written in the installation manual of the products before you start ser-
vicing.
– Work shall be undertaken under a controlled procedure so as to minimize the risk of a
flammable gas or vapor being present while the work is being performed.
– All maintenance staff and others working in the local area shall be instructed on the nature of
work being carried out.
– Work in confined spaces shall be avoided.
– The area around the workspace shall be sectioned off.
– Ensure that the conditions within the area have been made safe by control of flammable ma-
terial.
– Electric shock may occur. After turning off the power, always wait 5 minutes before touching
electrical components.
– Do not touch the fins of the heat exchanger. Touching the heat exchanger fins could result in
damage to the fins or personal injury such as skin rupture.
– Do not place any other electrical products or household belongings under the product.
– Condensation dripping from the product might get them wet, and may cause damage or mal-
function to the property.
• Checking for presence of refrigerant
– The area shall be checked with an appropriate refrigerant detector prior to and during work, to
ensure the technician is aware of potentially flammable atmospheres.
– Ensure that the leak detection equipment being used is suitable for use with flammable refrig-
erants, i.e. non-sparking, adequately sealed or intrinsically safe.
• Service parts information and design are subject to change without notice for product improve-
ment.
• For the latest information of the service parts, refer to our Service Portal.
https://fujitsu-general.force.com/portal/
• Precise figure of the service parts listed in this manual may differ from the actual service parts.
- (02-1) - 1. Precautions
TECHNICAL DATA AND PARTS LIST TECHNICAL DATA AND PARTS LIST

2. Indoor unit parts list
2-1. Models: ARXG45KHTB and ARXG54KHTB
¢Casing and fan
2
3
14
8
15
12
13
5
6
4
7
10
1
(Connector : black)
11
(Connector : white)
9
2-1. Models: ARXG45KHTB and ARXG54KHTB - (02-2) - 2. Indoor unit parts list
TECHNICAL DATA AND PARTS LIST TECHNICAL DATA AND PARTS LIST

Item no. Part no. Part name Service part
1 9372576014 Plate Top Sub Assy ♦
2 9372637029 Kit (Panel Front Sub Assy) ♦
3 9372035009 Panel Fan Assy ♦
4 9602802012 Motor, Induct ♦
5 9372057018 Casing A ♦
6 9372058015 Casing B ♦
7 9372059029 Sirocco Fan ♦
8 9372636022 Kit (Panel Rear Sub Assy) ♦
9 9900826086 Room Thermistor ♦
10 9372584248 Evaporator Sub Assy ♦
11 9901075032 Pipe Thermistor ♦
12 9372579015 Drain Pan Assy ♦
13 9372916025 Kit (Panel Right Sub Assy) ♦
14 9372581018 Kit (Panel Left Sub Assy) ♦
15 9372582015 Drain Pan S Sub Assy ♦
2-1. Models: ARXG45KHTB and ARXG54KHTB - (02-3) - 2. Indoor unit parts list
TECHNICAL DATA AND PARTS LIST TECHNICAL DATA AND PARTS LIST

¢Main PC board
27
22
25
24
26
21
23
2-1. Models: ARXG45KHTB and ARXG54KHTB - (02-4) - 2. Indoor unit parts list
TECHNICAL DATA AND PARTS LIST TECHNICAL DATA AND PARTS LIST

Item no. Part no. Part name Service part
21 9710661082 Power supply PCB ♦
22 9711870223 Main PCB (45) ♦
22 9711870230 Main PCB (54) ♦
23 9710019005 Communication PCB ♦
24 9306489045 Terminal 3P ♦
25 9900896027 Terminal 5P ♦
26 9900294014 Relay ♦
27 9900269111 Capacitor, Plastic ♦
- 9710343124 Wire with connector
(CN300 on Main PCB—Terminal) ♦
- 9710177118 Wire with connector
(CN46 on Main PCB—Terminal) ♦
- 9710703027 Wire with connector
(CN205 on Power supply PCB—Terminal (AC power)) ♦
- 9712115002 Wire assy
(CN12 on Main PCB—Relay (Sec)) ♦
- 9710171093 Wire with connector
(CN54 on Main PCB—CN264 on Power supply PCB) ♦
- 9710172014 Wire with connector
(CN55 on Main PCB—CN263 on Power supply PCB) ♦
2-1. Models: ARXG45KHTB and ARXG54KHTB - (02-5) - 2. Indoor unit parts list
TECHNICAL DATA AND PARTS LIST TECHNICAL DATA AND PARTS LIST

3. Outdoor unit parts list
3-1. Models: AOHG45KRTA and AOHG54KRTA
¢Exterior parts and chassis
15
6
9
12
7
2
1
16
20
17
14
13
23
24
18
21
22
a
b
11
10
4
5
3
3
19
8
3-1. Models: AOHG45KRTA and AOHG54KRTA - (02-6) - 3. Outdoor unit parts list
TECHNICAL DATA AND PARTS LIST TECHNICAL DATA AND PARTS LIST