Hitachi RAS-3HVRNS - 3 Piping Work and Refrigerant Charge

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
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........................................................................................................... 76
3.4.4 Twin and triple system installation................................................................................................ 78
3.4.5 Connecting flare adapter (only for RAS-(2/2.5)HVRN1(E))........................................................... 79
3.4.6 Drain discharging boss.................................................................................................................. 79
3 Piping work and
refrigerant charge
49
SMGB0060 rev. 1- 12/2010
3