Hitachi RAS-(2-3)HVRN(S)(2), Service Manual

Page: 59 / 488

3 Piping work and
refrigerant charge
49
SMGB0064 rev.0 - 08/2011
3
P i p i n g w o r k a n d r e f r i g e r a n t c h a r g e
3.
Index
3.1. General notes ........................................................................................................................................50
3.2. Piping work connection considerations .................................................................................................52
3.2.1. Piping Materials ......................................................................................................................................... 52
3.2.2. Three principles on refrigerant piping work ............................................................................................... 54
3.2.3. Suspension of refrigerant piping ................................................................................................................ 54
3.2.4. Brazing work .............................................................................................................................................. 55
3.2.5. Refrigerant charge ..................................................................................................................................... 56
3.2.6. Caution of the pressure by check joint ...................................................................................................... 56
3.2.7. Refrigerant charge quantity ....................................................................................................................... 57
3.2.8. Pump down refrigerant .............................................................................................................................. 59
3.3. Outdoor Units IVX Series ......................................................................................................................60
3.3.1. Piping connection ...................................................................................................................................... 60
3.3.2. Refrigerant piping length ........................................................................................................................... 65
3.3.3. Refrigerant piping selection ....................................................................................................................... 66
3.3.4. Twin and triple system installation ............................................................................................................. 67
3.3.5. Drain discharging boss .............................................................................................................................. 68
3.4. Outdoor Units ES Series .......................................................................................................................70
3.4.1. Piping connection ...................................................................................................................................... 70
3.4.2. Refrigerant piping length ........................................................................................................................... 75
3.4.3. Refrigerant piping selection ....................................................................................................................... 77
3.4.4. Twin and triple system installation ............................................................................................................. 78
3.4.5. Connecting flare adapter (only for RAS-(2/2.5)HVRN2) ............................................................................ 79
3.4.6. Drain discharging boss .............................................................................................................................. 80