Picture 5.4d
1.9.
Piping Selection
Please select copper pipe, PP-R pipe, galvanized pipe or stainless steel pipe based on the actual
requirement and size the system main inlet and outlet piping with reference to table 5.1.
Heat Pump QTY Main Outlet Piping Main Inlet Piping
1
DN40
DN40
2
DN65
DN65
3
DN80
DN80
4~5
DN100
DN100
6~8
DN125
DN125
Table 5.1 Main Inlet/Outlet Piping Size of the Hot Water System
Please size the piping for the auxiliary heater based on the auxiliary heater capacity and size the
hot water supply piping size based on actual situation. Please refer to table 5.2 as the typical hot
water flow velocity.
Piping OD-DN
15-20 25-40 ≥50
Flow Velocity m/s
≤0.8
≤1.0
≤1.2
Table 5.2 Typical Flow Velocity of Hot Water
