12. M a i n t e n a c e n o t e s
Index
12.1 Checking the power source and the wiring connection.............................................................. 458
12.2 Burnt-out compressor due to an insufficient refrigerant charge................................................. 459
12.3 Insufficient cooling performance when a long piping is applied................................................. 460
12.4 Abnormally high operation sound (in the ceiling type indoor unit).............................................. 461
12.5 Alarm code "31".......................................................................................................................... 462
12.6 Not cooling well due to insufficient installation space for the outdoor unit................................. 463
12.7 Caution with the refrigerant leakage........................................................................................... 464
12.7.1 Maximum permissible concentration of the HCFC gas................................................................. 464
12.7.2 Calculation of the refrigerant concentration.................................................................................. 464
12.7.3 Countermeasure for the refrigerant leakage according to the KHK standard............................... 464
12.8 Maintenance work...................................................................................................................... 465
12.9 Service and maintenance record................................................................................................ 466
12.10 Service and maintenance record using the 7-segment display.................................................. 468
12.11 Service and maintenance record by remote control switch........................................................ 470
12.12 Pump-down method for replacing the compressor..................................................................... 472
12 Maintenace notes
457
SMGB0060 rev. 1- 12/2010
12
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