Technical Information

Piping work and
refrigerant charge
TCGB0079 rev.0 - 01/2013
111
9. Piping wor k and r efrigerant char ge
9. Piping work and refrigerant charge .................................................................... 111
9.1 Refrigerant pipe selection.................................................................................................................... 112
9.1.1 Pipe size selection ........................................................................................................................................112
9.1.2 Multikit or distributor selection ......................................................................................................................112
9.2.1 Refrigerant piping length ..............................................................................................................................112
9.2.2 Piping system for header branch ..................................................................................................................113
9.2.3 Piping system for line branch .......................................................................................................................114
9.2.4 Combinations of piping size and piping length .............................................................................................115
9.2.5 Refrigerant piping size and multikit/distributor ..............................................................................................116
9.3 Copper pipes, sizes and connection ................................................................................................... 119
9.3.1 Copper pipes and sizes ................................................................................................................................119
9.3.2 Pipe connection ........................................................................................................................................... 120
9.3.3 Insulation ..................................................................................................................................................... 120
9.4 Refrigerant charge amount..................................................................................................................121
9.4.1 Refrigerant charge before shipment (W0 (kg)) ............................................................................................ 121
9.4.2 Calculation method for the additional refrigerant charge ............................................................................. 121
9.5 Caution in case of refrigerant leakage.................................................................................................124
9.5.1 Maximum permitted concentration of hydrouorocarbon (HFC) ................................................................. 124
9.5.2 Calculation of refrigerant concentration ....................................................................................................... 124
9.5.3 Countermeasure for refrigerant leakage ..................................................................................................... 124
9.6 Compatibility with the piping of current where R22 or R407C is used. ............................................... 125
9.6.1 Installation procedure for existing pipes ...................................................................................................... 125
9.6.2 When existing Air-Conditioner is a product of another manufacturer .......................................................... 125
9.6.3 Permissible range for existing Air-Conditioning Pipes
(Pipe length in the case of “without cleaning process”. ......................................................................................... 126
9.6.4 Renewal kit selection model ........................................................................................................................ 127
Contents
9
TCGB0079_rev0_11-2012.indb 111 29/01/2013 14:27:27