Commercial Air to Water Heat Pump Water Heater
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TROUBLE SHOOTING
Heat Pump Won’t Start
A delay of up to 20 minutes to 2 hours can be experienced
before heat pump starts operating
Incorrect Phase Rotation
The phase detect relay will open circuit if the heat pump
has been wired with incorrect phase rotation or if a phase
has failed. Both green and yellow LEDs on the relay will
be illuminated if phase rotation is correct.
Alarm light on heat pump controller
If the alarm light is flashing RED, check the alarm by
pressing the alarm button. Phone your nearest Rheem
Service Department to inform about the alarm.
Low Ambient Temperature
If the ambient air temperature is below setpoint, the heat
pump may not start. Check the control panel of the heat
pump. Check outside ambient temperature that shows on
the display.
Heat pump starts then turns off soon after
This could be caused by:
a. Insufficient water flow rate through heat exchanger.
Check pipe sizing per chart, check obstructions,
check lines and pump are bled, check pump is op-
erating, check temperature rise across inlet and
outlet.
NOTE: Tanks and heat pumps are to be manifolded in
Equa-Flow. It is important that the branches to each stor-
age tank ONLY contain a gate or ball valve and union.
Fitting of loose jumper valves, non-return valves or
pressure limiting valves in the branches or primary flow
and return lines between the heat pump and tanks WILL
affect performance of the heat pump.
b. Refrigerant charge too high? Refer to Alarm.
c. Refrigerant charge too low? Refer to Alarm.
Turn heat pump off then on again at isolating switch to
reset system.
Heat pump compressor excessively noisy
Check for correct phase rotation.
Phase
Detect
Relay
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