Hitachi RAS-4-HNCE - Maintenance Notes

12. Maintenance notes
455
SMGB0079 rev.0 - 01/2013
12
Index
12.1. General notes ......................................................................................................................................456
12.1.1. Checking the power source and the wiring connection ........................................................................... 456
12.1.2. Burnt-out compressor due to an insufcient refrigerant charge ............................................................... 456
12.1.3. Insufcient cooling performance when a long piping is applied ............................................................... 457
12.1.4. Abnormally high operation sound (in the ceiling type indoor unit). .......................................................... 457
12.1.5. Alarm code “31” ....................................................................................................................................... 458
12.1.6. Not cooling well due to insufcient installation space for the outdoor unit ............................................... 458
12.2. Maintenance work ...............................................................................................................................459
12.3. Service and maintenance record.........................................................................................................460
12.4. Service and maintenance record using the 7-segment display ...........................................................461
12.5. Service and maintenance record by remote control switch .................................................................463
12.6. Pump-down method for replacing the compressor..............................................................................464
1 2 . M a i n t e n a n c e n o t e s