Fujitsu AUXB18GALH User Manual

SERVICE MANUAL

Fujitsu AUXB18GALH Specifications

General

Cooling Capacity (kW)	5.3
Refrigerant	R410A
Cooling Capacity (BTU/hr)	18000
Power Supply	Single Phase
Noise Level (Outdoor)	50 dB(A)

Summary

1. TEST RUN

1-1 EXECUTION PROCEDURE AND EXECUTION PRECAUTIONS

Details procedures and precautions for test run execution.

1-2 TEST RUN METHOD

Describes the methods for conducting a test run.

1-2-1 Check Items Before Power ON

Lists essential checks to perform before powering on the unit.

1-2-2 Check Items After Power ON

Lists checks to perform after powering on the unit.

1-2-5 Indoor unit connection check

Verifies the connection status of indoor units.

2. OUTDOOR UNIT OPERATION CONTROL

2-2 COMPRESSOR OPERATION

Details compressor operation, including start/stop and capacity control.

2-2-1 Operation / Stop Condition

Conditions under which the compressor operates or stops.

2-2-2 Capacity Control

Explains how compressor capacity is controlled.

2-2-3 Speed Range of Start, Stop, And Operation

2-3 FAN CONTROL

2-4 EXPANSION VALVE CONTROL

2-5-1 Oil Recovery Operation

2-5-3 Defrost Operation Control

2-6 PROTECTIVE FUNCTION

List and explanation of protective functions.

2-6-1 Protective Function List

Comprehensive list of protective functions and their conditions.

3. INDOOR UNIT OPERATION

3-1 FAN CONTROL

3-2 MASTER CONTROL

Overall master control logic for indoor units.

3-2-1 Operation Mode Control

3-2-2 Auto Changeover

3-4 ELECTRONIC EXPANSION VALVE CONTROL

3-6-2 Icing Protection Control

3-6-3 Oil Recovery Operation

3-7 TIMER CONTROL

4. TROUBLE SHOOTING

4-2 ABNORMAL OPERATION

Troubleshooting abnormal operations and error codes.

4-2-1 Indoor Unit Display

Indoor unit display patterns and error indications.

4-2-2 Outdoor Unit Display

Outdoor unit display patterns and error indications.

4-2-3 Error Code List for Outdoor Unit

Comprehensive list of outdoor unit error codes and their meanings.

4-2-4 Remote Controller Display

Error displays on various remote controllers.

4-2-5 Error Code List for Simple and Wired Remote Controller

Error codes for simple and wired remote controllers.

4-2-6 Error Code List for Group Remote Controller

Error codes for group remote controllers.

4-2-7 Trouble shooting - No Error code -

Troubleshooting steps when no error code is displayed.

4-2-8 Error Code List for External Switch Controller

Error codes for external switch controllers.

4-2-9 Error Code List for Signal Amplifier

Error codes for signal amplifiers.

4-2-10 Error Code List for Network Convertor

Error codes for network converters.

4-2-11 Error Code List for Wireless LAN Adaptor

Error codes for wireless LAN adapters.

4-2-12 TROUBLE SHOOTING WITH ERROR CODE

Step-by-step troubleshooting for specific error codes.

4-3 TROUBLE SHOOTING

General troubleshooting without error codes.

4-3-2 Trouble Shooring With Error Code (OUTDOOR UNIT)

Troubleshooting outdoor unit errors.

4-3-3 TROUBLE SHOOTING WITH NO ERROR CODE

Troubleshooting steps for issues without specific error codes.

4-3-4 Trouble Shooting for Optional Parts

Troubleshooting for optional parts like external controllers.

6. DISASSEMBLY PROCESS

2. SERVICE PANEL removal

3. MAIN PCB removal

4. COMMUNICATION PCB removal

5. INVERTER PCB, FILTER PCB, DIODE BRIDGE and POWER PCB removal

5-1. FILTER PCB removal

5-2. INVERTER PCB removal

5-3. DIODE BRIDGE removal

5-4. POWER PCB removal

6. FAN DRIVER PCB and INVERTER CT PCB removal ( For AJY108LELAH )

6-1. FAN DRIVER PCB removal

6-2. INVERTER CT PCB removal

7. PRESSURE SENSOR, SOLENOID COIL removal

7-1. PRESSURE SENSOR removal

7-2. SOLENOID COIL (4way valve) removal

8. EEV COIL removal

9. THERMISTOR removal

10. FAN MOTOR removal

11. TOP PANEL removal

12. REACTOR removal

13. PIPE COVER FRONT removal

14. RIGHT PANEL removal

15. COMPRESSOR removal

Procedure for removing the compressor.

16. Precautions for exchange of refrigerant-cycle-parts

Safety precautions for replacing refrigerant cycle parts.