Hitachi EV-1.5N1, Service Manual

Page: 6 / 480

General Index
iv
SMGB0079 rev.0 - 01/2013
3. Piping work and refrigerant charge ............................................................................51
3.1 General notes before performing pipe work .............................................................................................52
3.1.1 Piping Materials ............................................................................................................................................. 52
3.1.2 Three principles on refrigerant piping work ................................................................................................... 54
3.1.3 Suspension of refrigerant piping .................................................................................................................... 54
3.1.4 Brazing work .................................................................................................................................................. 55
3.2 Piping connection for outdoor unit ............................................................................................................56
3.2.1 RAS-(2-2.5)HVNP / RAS-3HVNC ................................................................................................................. 56
3.2.2 RAS-3HVNPE / RAS-(4-6)H(V)N(P/C)E / RAS-(8-10)HN(P/C)E / RAS-12HN(P/C) ..................................... 57
3.2.3 Outdoor unit stop valve ................................................................................................................................. 60
3.3 Refrigerant piping range ...........................................................................................................................62
3.3.1 Refrigerant piping length ............................................................................................................................... 62
3.3.2 Piping system for header branch ................................................................................................................... 62
3.3.3 Piping system for line branch ........................................................................................................................ 65
3.3.4 Combinations of piping size and piping length .............................................................................................. 66
3.3.5 Refrigerant piping size and multikit/distributor selection ............................................................................... 67
3.3.6 System installation ........................................................................................................................................ 70
3.3.7 Connecting flare adapter ............................................................................................................................... 71
3.4 Refrigerant charge ....................................................................................................................................72
3.4.1 Caution of the pressure by check joint .......................................................................................................... 73
3.4.2 Refrigerant charge quantity ........................................................................................................................... 74
3.5 Caution in case of refrigerant leakage ......................................................................................................78
3.5.1 Maximum permitted concentration of hydrofluorocarbon (HFC) ................................................................... 78
3.5.2 Calculation of refrigerant concentration ......................................................................................................... 78
3.5.3 Countermeasure for refrigerant leakage ....................................................................................................... 78
3.6 Piping work for compatibility with the piping of current installations where is used R22 or R407C. ........79
3.6.1 Installation procedure for existing pipes ........................................................................................................ 79
3.6.2 When existing Air-Conditioner is a product of another manufacturer ............................................................ 79
3.6.3 Permissible range for existing Air-Conditioning Pipes
(Pipe length in the case of “without cleaning process”. ........................................................................................... 80
3.6.4 Renewal kit selection model .......................................................................................................................... 81
3.7 Drain piping...............................................................................................................................................85
3.7.1 Drain discharging boss .................................................................................................................................. 85
4. Electrical wiring ............................................................................................................87
4.1 General notes ...........................................................................................................................................88
4.1.1 General check ............................................................................................................................................... 88
4.2 Electrical wiring connection for the outdoor unit .......................................................................................90
4.3 Setting the DIP switches for the outdoor unit ............................................................................................92