Hitachi P-AP56NAM, Service Manual

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3 Piping work and refrigerant charge
SMGB0099 rev.0 - 12/2016 95
3
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 Refrigerant pipe selection......................................................................................................................96
3.1.1 Refrigerant pipe selection .............................................................................................................................. 96
3.2 Copper pipes, sizes, connection and insulation ....................................................................................97
3.2.1 Copper pipes and sizes ................................................................................................................................. 97
3.2.2 Pipe connection ............................................................................................................................................. 98
3.2.3 Insulation of multikits and/or branches .......................................................................................................... 98
3.3 General instructions on the installation of refrigerant pipes ..................................................................99
3.4 Copper refrigerant pipe .......................................................................................................................100
3.4.1 Three principles on work with refrigerant pipes ........................................................................................... 100
3.4.2 Preparing and cutting copper refrigeration pipes ........................................................................................ 101
3.4.3 Bending copper pipes .................................................................................................................................. 102
3.4.4 Brazing copper refrigeration pipes .............................................................................................................. 103
3.4.5 Flared connection mounting ........................................................................................................................ 104
3.4.6 Refrigerant pipe suspension ........................................................................................................................ 105
3.5 Refrigerant and drain hose installation ................................................................................................106
3.5.1 RCI-(1.0-6.0)FSN4 - 4-way cassette ........................................................................................................... 106
3.5.2 RCIM-(0.6-2.5)FSN4(E) - 4-way cassette (compact) .................................................................................. 108
3.5.3 RCD-(0.8-6.0)FSN3 - 2-way cassette ......................................................................................................... 109
3.5.4 RPC-(3.0-6.0)FSN3E - Ceiling type .............................................................................................................110
3.5.5 RPC-(1.5-6.0)FSN3E - Ceiling type .............................................................................................................112
3.5.6 RPI-(0.6-1.5)FSN4E - Ducted indoor unit .....................................................................................................116
3.5.7 RPI-(2.0-6.0)FSN4E - Ducted indoor unit .....................................................................................................118
3.5.8 RPI-(8.0/10.0)FSN3E-(f) - Ducted indoor unit ............................................................................................. 120
3.5.9 RPI-(16.0/20.0)FSN3PE(-f) - Ducted indoor unit ......................................................................................... 121
3.5.10 RPIM-(0.6-1.5)FSN4E(-DU) - Ducted indoor unit ...................................................................................... 123
3.5.11 RPK-(0.6-4.0)FSN(H)3M - Wall type ......................................................................................................... 125
3.5.12 RPF(I)-(1.0-2.5)FSN2E - Floor type .......................................................................................................... 128
3.6 Refrigerant charge...............................................................................................................................129
3.7 Precautions in the event of refrigerant leaks .......................................................................................129
3.7.1 Maximum permissible concentration of hydrofluorocarbon (HFC) .............................................................. 129
3.7.2 Calculation of the concentration of refrigerant ............................................................................................. 129
3.7.3 Countermeasures in the event of refrigerant leaks ..................................................................................... 129