Raypak B0507 Owner's Manual And Installation Instructions page 23

Closed Loop Water Source Heat Pump Applications
1. Only use a water heater with on/off controls.
2. The bypass pipe diameter MUST be the same as the inlet and outlet pipes.
3. Select the pipe size between the heater and the system loop main, equal to the inlet/outlet header connections
of the water heater (as a minimum).
4. Install the correct pump. The temperature rise must be between 10°C and 15°C. Refer to the
and Pipe Size" table on page 16.
Typical Installation – Closed Loop Water Source Heat Pump
23
CONNECTIONS – PLUMBING
"Pump Selection