Hitachi RAS-(4-6)HVRNS2E - Maintenace Notes Index

12 Maintenace notes
461
SMGB0064 rev.0 - 08/2011
12
M a i n t e n a c e n o t e s
12.
Index
12.1. Checking the power source and the wiring connection ....................................................................... 462
12.2. Burnt-out compressor due to an insufcient refrigerant charge ..........................................................463
12.3. Insufcient cooling performance when a long piping is applied ..........................................................464
12.4. Abnormally high operation sound (in the ceiling type indoor unit). ...................................................... 465
12.5. Alarm code “31” ................................................................................................................................... 466
12.6. Not cooling well due to insufcient installation space for the outdoor unit ..........................................467
12.7. Caution with the refrigerant leakage....................................................................................................468
12.7.1. Maximum permissible concentration of the HCFC gas ........................................................................... 468
12.7.2. Calculation of the refrigerant concentration ............................................................................................. 468
12.7.3. Countermeasure for the refrigerant leakage according to the KHK standard .......................................... 468
12.8. Maintenance work ...............................................................................................................................469
12.9. Service and maintenance record.........................................................................................................470
12.10. Service and maintenance record using the 7-segment display ........................................................... 472
12.11. Service and maintenance record by remote control switch ................................................................. 474
12.12. Pump-down method for replacing the compressor..............................................................................476