Rheem 310 Owner's Manual And Installation Instructions page 12

SAVE A SERVICE CALL
HEAT PUMP IS NOT OPERATING
Time controlled power supply
If the water heater is connected to a time controlled power supply, then during periods of no power
supply at the water heater the heat pump and booster heating unit will not operate.
This is not a fault condition, but a result of no power being available to operate the water heater.
Heat pump operating range
The heat pump will not operate for extended periods when the ambient air temperature is outside the
heat pump‟s operating range. The heat pump will operate when the ambient air temperature is 5°C or
higher. The booster heating unit will operate when the ambient air temperature falls below 5°C, if heating
is required.
The boost capacity of the booster heating unit in booster heating mode is 220 litres and the water will be
heated to 60°C during these periods.
Heating of the water by the heat pump will occur when the ambient air temperature returns to within the
heat pump‟s operating range.
Thermal cut out activated
Has the thermal cut out for the heat pump compressor activated?
The refrigeration circuit is protected by a thermal sensor. This will activate a thermal cut out in the event
of thermal surges or excessive heat in the refrigeration system.
If the thermal cut out has activated, the heat pump will not operate. The water heater will switch to
booster heating mode to ensure a supply of hot water. If heating of the water is required, the booster
heating unit will operate regardless of the ambient air temperature. In booster heating mode, the boost
capacity of the heating unit is 220 litres and the water will be heated to 60°C.
The thermal cut out will automatically reset itself when the compressor cools down.
To check whether there may be a problem, open a hot tap and allow to run for ten to fifteen minutes.
The heat pump, if working properly, will activate and continue operating to heat the water. Close the hot
tap when the heat pump begins to operate.
However, if the heat pump deactivates within five minutes, there may be a problem. Phone your nearest
Rheem Service Department or Accredited Service Agent to arrange for an inspection.
Heat pump fault
Has the heat pump developed a fault?
If the heat pump has developed a fault condition, the heat pump will not operate and the water heater
will switch to backup heating mode to ensure a supply of hot water.
In backup heating mode, the booster heating unit and its controlling thermostat will operate if heating of
the water is required, regardless of the ambient air temperature. The water heater, during backup
heating mode will heat the water to a temperature of 70°C. The boost capacity of the heating unit in
backup heating mode is 110 litres.
Phone your nearest Rheem Service Department or Accredited Service Agent to arrange for an
inspection.
EXPANSION CONTROL VALVE RUNNING
If an expansion control valve is fitted in the cold water line to the water heater
discharge a small quantity of water instead of the temperature pressure relief valve on the water heater. The
benefit is that energy is conserved as the discharged water is cooler.
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(refer to page 28) it may