Hitachi RAS-(3-6)HVNC1(E) - Page 6

General index
iv
SMGB0087 rev.0 - 12/2013
3. Pipingworkandrefrigerantcharge....................................................................... 61
3.1 General notes before performing pipe work .............................................................................................62
3.1.1 Piping Materials ............................................................................................................................................. 62
3.1.2 Three principles on refrigerant piping work ................................................................................................... 64
3.1.3 Suspension of refrigerant piping .................................................................................................................... 64
3.1.4 Brazing work .................................................................................................................................................. 65
3.2 Piping connection for outdoor unit ............................................................................................................66
3.2.1 RAS-(2-2.5)HVNP1 / RAS-3HVNC1 ............................................................................................................. 66
3.2.2 RAS-3HVNP1E / RAS-(4-6)H(V)N(P/C)1E / RAS-(8-10)HN(P/C)E / RAS-12HN(P/C) ................................. 67
3.2.3 Outdoor unit stop valve ................................................................................................................................. 70
3.3 Refrigerant piping range ...........................................................................................................................72
3.3.1 Refrigerant piping length ............................................................................................................................... 72
3.3.2 Piping system for header branch ................................................................................................................... 72
3.3.3 Piping system for line branch ........................................................................................................................ 75
3.3.4 Combinations of piping size and piping length .............................................................................................. 76
3.3.5 Refrigerant piping size and multikit/distributor selection ............................................................................... 77
3.3.6 System installation ........................................................................................................................................ 80
3.3.7 Connecting are adapter ............................................................................................................................... 82
3.4 Refrigerant charge ....................................................................................................................................83
3.4.1 Caution of the pressure by check joint .......................................................................................................... 84
3.4.2 Refrigerant charge quantity ........................................................................................................................... 84
3.5 Caution in case of refrigerant leakage ......................................................................................................89
3.5.1 Maximum permitted concentration of hydrouorocarbon (HFC) ................................................................... 89
3.5.2 Calculation of refrigerant concentration ......................................................................................................... 89
3.5.3 Countermeasure for refrigerant leakage ....................................................................................................... 89
3.6 Compatibility with the piping of current installations where R22 or R407C is used ..................................90
3.6.1 Installation procedure for existing pipes ........................................................................................................ 90
3.6.2 When existing air-conditioner is a product of another manufacturer ............................................................. 90
3.6.3 Renewal kit selection model .......................................................................................................................... 92
3.7 Drain piping...............................................................................................................................................96
3.7.1 Drain discharging boss .................................................................................................................................. 96
4. Electricalwiring....................................................................................................... 97
4.1 General notes ...........................................................................................................................................98
4.1.1 General check ............................................................................................................................................... 98
4.2 Electrical wiring connection for the outdoor unit .....................................................................................100
4.3 Setting the DIP switches for the outdoor unit ..........................................................................................102
4.3.1 Quantity and position of DIP switches ......................................................................................................... 102