Hitachi RAS-4HRNME-AF - Page 97

9. Refrigerant and water piping
TCGB0075 rev.0 - 11/2012
97
9
9. Re fr i ge r an t a nd wa ter p i pi n g
Index
9.1. Refrigerant circuit ..................................................................................................................................98
9.1.1. Refrigerant piping ..................................................................................................................................... 98
9.1.2. Piping connections .................................................................................................................................... 99
9.1.3. Refrigerant charge amount ...................................................................................................................... 100
9.1.4. Precautions in the event of gas refrigerant leaks .................................................................................... 100
9.1.5. Pump down of refrigerant ........................................................................................................................ 102
9.1.6. Refrigerant check joints ........................................................................................................................... 102
9.2. Space heating hydraulic circuit............................................................................................................103
9.2.1. Hydraulic circuit ....................................................................................................................................... 103
9.2.2. Water piping............................................................................................................................................. 104
9.2.3. Water quality ............................................................................................................................................ 105
9.2.4. Water ow adjustment ............................................................................................................................. 105
9.2.5. Pressure charts ....................................................................................................................................... 107
9.3. Domestic Hot Water hydraulic circuit (Optional) ..................................................................................108
9.3.1. Hydraulic circuit ....................................................................................................................................... 108
9.3.2. Water piping..............................................................................................................................................110
9.3.3. Water quality .............................................................................................................................................112