Hitachi UTOPIA RAS-4HVRP2E - Page 6

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SMGB0136 rev.0 - 07/2021
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3. Piping work and refrigerant charge ....................................................................... 41
3.1 General notes before performing pipe work .......................................................................................... 42
3.1.1 Piping Materials ............................................................................................................................................. 42
3.1.2 Three principles on refrigerant piping work ................................................................................................... 44
3.1.3 Suspension of refrigerant piping .................................................................................................................... 44
3.1.4 Brazing work .................................................................................................................................................. 45
3.2 Piping connection for outdoor unit .........................................................................................................46
3.2.1 RAS-3HVRC2 ................................................................................................................................................ 46
3.2.2 RAS-(4-6)H(V)(R/N)(C/P)2E ......................................................................................................................... 47
3.2.3 Outdoor unit stop valve ................................................................................................................................. 50
3.3 Refrigerant piping range ........................................................................................................................52
3.3.1 Refrigerant piping length ............................................................................................................................... 52
3.3.2 Piping system for header branch ................................................................................................................... 52
3.3.3 Maximum lenght of refrigerant piping ............................................................................................................ 53
3.3.4 Combinations of piping size and piping length .............................................................................................. 54
3.3.5 Refrigerant piping size and multikit/distributor ............................................................................................... 54
3.3.6 System installation ........................................................................................................................................ 56
3.4 Refrigerant charge.................................................................................................................................59
3.4.1 Caution of the pressure by check joint .......................................................................................................... 60
3.4.2 Refrigerant charge quantity ........................................................................................................................... 60
3.4.3 Refrigerant charge before shipment (W
0
(kg)) ............................................................................................... 61
3.4.4 Calculation method for the additional refrigerant charge ............................................................................... 61
3.5 Caution in case of refrigerant leakage...................................................................................................63
3.5.1 Maximum permitted concentration of hydrouorocarbon (HFC) ................................................................... 63
3.5.2 Calculation of refrigerant concentration ......................................................................................................... 63
3.5.3 Countermeasure for R410A refrigerant leakage ............................................................................................ 64
3.6 Drain piping ...........................................................................................................................................65
3.6.1 Drain discharging boss .................................................................................................................................. 65
4. Electrical and control settings ................................................................................ 67
4.1 General notes ........................................................................................................................................68
4.1.1 General check ............................................................................................................................................... 68
4.1.2 LED’s indication ............................................................................................................................................. 68
4.2 Electrical wiring connection for the outdoor unit ....................................................................................69
4.3 Electrical settings ..................................................................................................................................70
4.3.1 Outdoor and indoor unit electrical wiring ....................................................................................................... 70
4.3.2 Wire size ........................................................................................................................................................ 71
4.4 Electrical wiring diagrams......................................................................................................................73
4.4.1 RAS-3HVRC2 ................................................................................................................................................ 73
4.4.2 RAS-(4-6)HV(R/N)(C/P)2E (1~ 230V 50Hz) ................................................................................................. 75
4.4.3 RAS-(4-6)HV(R/N)(C/P)2E (3N~ 400V 50Hz) ............................................................................................... 77