Hitachi RAS-(4-6)HVRNS2E - Page 9

ix
Contens
SMGB0064 rev.0 - 08/2011
11.6 Capacitor (CB1 CB2) ............................................................................................................................457
11.7 Reactor (DCL) .......................................................................................................................................458
11.7.1 Reactor (DCL) for 3N~ .............................................................................................................................. 458
11.7.2 Reactor (DCL) for 1~ ................................................................................................................................ 458
11.8 Scroll compressor .................................................................................................................................459
11.8.1 Reliable mechanism for low vibrating and low sound ................................................................................ 459
11.8.2 Principle of compression ........................................................................................................................... 459
12. Maintenace notes ..................................................................................................... 461
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