Raypak B0520 Installation And Operating Instructions Manual page 27

CLOSED LOOP WATER SOURCE HEAT PUMP
Commissioning procedure – refer to diagram below
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 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
heater condensation. 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.
COMMISSIONING
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