Hitachi YUTAKI Series Service Manual

9
General index
SMGB0066 rev.0 - 12/2009
Contents
Service Manual
0
4.24. Yutaki unit PCB .........................................................................................................................144
4.25. Safety and control device setting ..............................................................................................145
4.25.1. Defrost operation control ......................................................................................................................147
4.25.2. Control of expansion valve ...................................................................................................................149
5. Available optional functions..........................................................................................................151
5.1. Freeze protection ......................................................................................................................152
5.2. Restart after power failure .........................................................................................................152
5.3. Compressor ON/OFF control ....................................................................................................153
5.4. 3 Minutes guard control .............................................................................................................154
5.5. Power save mode......................................................................................................................154
6. Test run ........................................................................................................................................155
6.1. Checking procedure before the test run ....................................................................................156
6.2. Test run procedure for Yutaki ....................................................................................................158
6.2.1. System controller testing ......................................................................................................................160
7. Troubleshooting ...........................................................................................................................165
7.1. Initial troubleshooting ................................................................................................................166
7.1.1. Unit and System controller - Power Supply failure ...............................................................................166
7.1.2. Abnormal operation of the devices .......................................................................................................168
7.1.3. Incidents of operation ...........................................................................................................................174
7.2. Troubleshooting procedure .......................................................................................................175
7.2.1. Alarm code ...........................................................................................................................................177
7.3. Failure diagnosis method ..........................................................................................................216
7.4. Checking procedure for main parts ...........................................................................................218
7.4.1. RHUE-(3~6)AVHN. Procedure for checking the DIP-IPM. ...................................................................218
7.4.2. RHUE-(5/6)AHN. Procedure for checking the ISPM. ...........................................................................220
7.4.3. Checking capacitors CB1 & CB2. ........................................................................................................222
7.4.4. Fault diagnosis of DC fan motor. ..........................................................................................................223
7.5. Troubleshooting of control system ............................................................................................225
7.5.1. System controller..................................................................................................................................225
7.5.2. System MMI Pack ................................................................................................................................226

Hitachi YUTAKI Series Specifications

General

Heating Capacity	5.0 kW - 16.0 kW
Cooling Capacity	5.0 kW - 16.0 kW
Energy Efficiency Class	A+++
Refrigerant	R32
Operating Temperature Range (Cooling)	46°C
Noise Level (Indoor Unit)	45 dB
Noise Level (Outdoor Unit)	45 dB