Hitachi RASC-10HNPE, Service Manual, Page: 6 / 306

General Index
SMGB0091 rev.2 - 11/2015 IV
3.3 Refrigerant piping range ........................................................................................................................38
3.3.1 Refrigerant piping length ............................................................................................................................... 38
3.3.2 Piping system (Header branch installation) ................................................................................................... 38
3.3.3 Piping system (Line branch installation) ........................................................................................................ 41
3.3.4 Combinations of piping size and piping length .............................................................................................. 42
3.3.5 Refrigerant piping size and multikit/distributor selection ............................................................................... 43
3.3.6 Considerations when installing distributors ................................................................................................... 47
3.4 Refrigerant charge .................................................................................................................................48
3.4.1 Refrigerant charge amount ............................................................................................................................ 48
3.4.2 Refrigerant charge procedure ....................................................................................................................... 50
3.4.3 Caution of the pressure by check joint .......................................................................................................... 51
3.4.4 Pump down refrigerant .................................................................................................................................. 51
3.5 Caution in case of refrigerant leakage...................................................................................................52
3.5.1 Maximum permitted concentration of HFCs .................................................................................................. 52
3.5.2 Calculation of refrigerant concentration ......................................................................................................... 52
3.5.3 Countermeasure for refrigerant leakage ....................................................................................................... 52
3.6 Compatibility with the piping of current installations where R22 or R407C is used ..............................54
3.6.1 Installation procedure for existing pipes ........................................................................................................ 54
3.6.2 When the existing air conditioner is a product of another manufacturer ....................................................... 55
3.6.3 Permissible range for existing air-conditioning pipes .................................................................................... 55
3.6.4 Selection of the renewal kit model ................................................................................................................. 55
3.7 Drainage and drain pipe installation ......................................................................................................57
4. Electrical and control settings ................................................................................ 59
4.1 General check .......................................................................................................................................60
4.2 System wiring diagram ..........................................................................................................................61
4.3 Electrical connection of the RASC unit ..................................................................................................62
4.3.1 Wiring size ..................................................................................................................................................... 62
4.3.2 Minimum requirements of the protection devices .......................................................................................... 62
4.4 Transmission wiring between RASC and indoor unit ............................................................................63
4.5 Printed circuit board ..............................................................................................................................64
4.5.1 RASC-(4-6)HNPE .......................................................................................................................................... 64
4.5.2 RASC-(8-10)HNPE ........................................................................................................................................ 65
4.6 Setting and function of DIP and RSW switches for RASC units ............................................................66
4.6.1 Location of DIP switches and RSW switches ................................................................................................ 66
4.6.2 Functions of dip switches and rotary switches .............................................................................................. 66
4.6.3 Jumper lead setting (JP1~6) ......................................................................................................................... 69
4.6.4 LED’s indication ............................................................................................................................................. 69