Hitachi RCD-2.5FSN2, Service Manual

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3 Piping work and
refrigerant charge
91
3
SMGB0077 rev.0 - 01/2013
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
3.
Index
3.1. Refrigerant pipe selection......................................................................................................................92
3.1.1. Refrigerant pipe selection .......................................................................................................................... 92
3.2. Copper pipes, sizes, connection and insulation ....................................................................................93
3.2.1. Copper pipes and sizes ............................................................................................................................. 93
3.2.2. Pipe connection ......................................................................................................................................... 94
3.2.3. Insulation of multikits and/or branches ...................................................................................................... 94
3.3. General instructions on the installation of refrigerant pipes ..................................................................95
3.4. Copper refrigerant pipe .........................................................................................................................96
3.4.1. Three principles on work with refrigerant pipes ......................................................................................... 96
3.4.2. General information on copper refrigeration pipes .................................................................................... 96
3.4.3.
Diameters of the copper refrigeration pipes .............................................................................................. 97
3.4.4. Preparing and cutting copper refrigeration pipes ....................................................................................... 97
3.4.5. Bending copper pipes ................................................................................................................................ 99
3.4.6.
Brazing copper refrigeration pipes ............................................................................................................. 99
3.4.7. Flared connection mounting .................................................................................................................... 100
3.4.8. Refrigerant pipe insulation ....................................................................................................................... 101
3.4.9. Refrigerant pipe suspension .................................................................................................................... 101
3.5. Refrigerant and drain hose installation ................................................................................................102
3.5.1. RCI - 4-way cassette (1.0-6.0)FSN3 ....................................................................................................... 102
3.5.2. RCI - 4-way cassette (1.0-6.0)FSN3Ei .................................................................................................... 104
3.5.3. RCIM-4-way cassette (compact) (0.8-2.0)FSN2 ..................................................................................... 106
3.5.4. RCD - 2-way cassette (1.0-5.0)FSN2 ...................................................................................................... 107
3.5.5. RPC - Ceiling type (2.0-6.0)FSN2E ......................................................................................................... 108
3.5.6. RPI - Ducted indoor unit (0.8-1.5)FSN4E .................................................................................................113
3.5.7. RPI - Ducted indoor unit (2.0-6.0)FSN4E .................................................................................................114
3.5.8. RPI- Ducted indoor unit (8.0/10.0)FSN3E ................................................................................................116
3.5.9. RPIM - Ducted indoor unit (0.8-1.5)FSN4E(-DU) .....................................................................................118
3.5.10. RPK - Wall type (0.8-4.0)FSN(H)3M ........................................................................................................ 120
3.5.11. RPF(I)-Floor type (1.0-2.5)FSN2E ........................................................................................................... 124
3.6. Refrigerant charge...............................................................................................................................125
3.7. Precautions in the event of refrigerant leaks .......................................................................................126
3.7.1. Maximum permissible concentration of hydrofluorocarbon (HFC) .......................................................... 126
3.7.2. Calculation of the concentration of refrigerant ......................................................................................... 126
3.7.3. Countermeasures in the event of refrigerant leaks .................................................................................. 126