Hitachi UTOPIA R32 Series Installation And Operation Manual page 8

5.4.2 Cutting copper refrigeration pipes ........................................................19
5.4.3 Bending copper pipes ............................................................................19
5.4.4 Brazing copper refrigerant pipes ...........................................................20
5.5 Refrigerant pipe insulation ..............................................................................21
5.6 Suspension of Refrigerant Piping ....................................................................22
5.7 Line branch and header branch installation ...................................................22
5.8 Piping connection for outdoor unit .................................................................23
5.8.1 Outdoor unit stop valve .........................................................................25
5.8.2 Connecting flare adapter .......................................................................26
6. Refrigerant piping length
6.1 RAS-(2-3)HVRC3 ...............................................................................................28
6.1.1 Refrigerant piping length .......................................................................28
6.1.2 Piping system for header branch...........................................................28
6.1.3 Combinations of piping size and piping length .....................................30
6.1.5 Refrigerant piping size and Multi-Kit/distributor ..................................31
7. DIP switches ..............................................................................................................32
7.1 Setting of DIP switches for outdoor unit .........................................................33
8. Commissioning .........................................................................................................37
8.1 Main concerns for commissioning ..................................................................38
9. Vacuum pumping
9.1 Basic Method ...................................................................................................40
9.2 Triple Evacuation Method ...............................................................................41
9.3 RAS-(2-3)HVRC3 vacuum pumping example ...................................................42
10. Charging work .........................................................................................................43
10.1 Important considerations ................................................................................44
10.2 RAS-(2-3)HVRC3 charging work example ........................................................46
PMEN0654 rev.0 - 12/2023
..........................................................................................27
......................................................................................................39
II
III