Raypak B0507 Owner's Manual And Installation Instructions page 38

CLOSED LOOP WATER SOURCE HEAT PUMP COMMISSIONING PROCEDURE
Refer to the diagram below for the location of components described in this procedure.
1 Check that both isolation valves are open.
2 Adjust balancing valve A to half open and balancing valve B to fully open.
3 Start up the water heater and adjust balancing valve A to obtain a heater inlet temperature of approximately
10°C greater than the system loop return temperature, (turning valve A in the open direction will increase the
heater inlet temperature and closing valve A will lower the heater inlet temperature). NOTE: The heater inlet
should never be less than 41°C.
4 If the heater inlet temperature remains less than 10°C higher than the system loop return temperature and
valve A is fully open, leave valve A fully open and throttle valve B until the heater inlet temperature rises to be
10°C higher than the system loop return temperature.
5 Main loop and heater temperatures should be checked regularly throughout the season to prevent
condensation forming in the water heater. If the balancing valves are adjusted at the coldest loop temperature
(typically 10°C) and the heater temperature to 41°C then the entire heating season should have a proper 41°C
operation. The heater inlet temperature can be higher than 41°C without heater damage, but operating at less
than 41°C inlet can cause damage from condensation.
Typical Installation – Closed Loop Water Source Heat Pump
38
COMMISSIONING