Specifications

SAVE A SERVICE CALL
17
WATER NOT HOT ENOUGH
You may find that due to heavy hot water usage or low solar energy gain the water temperature may be
lower than normally expected. Ensure the booster is being used as advised. If a timer is installed, you will
need to carefully plan your use of the booster heating unit to boost the water temperature on such occasions.
Refer to “Booster Control” on page 7.
A lower water temperature may also be noticed in the morning when the booster heating unit has not been
energised overnight. This in particular may be experienced during periods of low solar energy gain and can
be caused by the transfer of heat energy overnight to the cold water in the lower portion of the solar storage
tank, or if there has been heavy hot water usage the previous night. Refer to “Temperature Run Down” on
page 7.
TEMPERATURE PRESSURE RELIEF VALVE RUNNING
Normal Operation
It is normal and desirable this valve allows a small quantity of
water to escape during the heating cycle. However, if it
discharges more than a bucket full of water in 24 hours,
there may be another problem.
Continuous dribble
Try gently raising the easing lever on the relief valve for a
few seconds (if accessible) (refer to “Temperature Pressure
Relief Valve” on page 12). This may dislodge a small particle
of foreign matter and clear the fault. Release the lever gently.
If the relief valve lever is not readily and safely accessible,
contact Rheem Service or their nearest Accredited Service
Agent. Do not attempt to climb onto a non trafficable roof to
operate the relief valve lever.
Steady flows for long period (often at night)
This may indicate the mains water pressure sometimes rises above the designed pressure of the water
heater. Ask your installing plumber to fit a pressure limiting valve.
Warning: Never replace the relief valve with one of a higher pressure rating.
Heavy flows of hot water until the water heater is cold - then stops until water reheats
If this occurs when the water heater is being boosted by the electric booster heating unit, then the water
heater must be switched off at the isolating switch or switchboard. Phone Rheem Service or their
nearest Accredited Service Agent to arrange for an inspection.
This may also occur on a water heater without an over temperature protection (OTP) system during
periods of increased solar gain in the hotter months and particularly if there is a reduced level of hot
water consumption. It is most likely to happen during the daytime.
One of the functions of the temperature pressure relief valve is to relieve the tank of excess energy,
i.e. when water temperature increases to a high level. This higher temperature water is replaced with
incoming cold water to reduce the energy level inside of the tank. The valve will close when cooler water
surrounds the temperature probe of the valve. As this is a function of the temperature pressure relief
valve under these conditions, it is not necessary to make a service call.
EXPANSION CONTROL VALVE RUNNING
An expansion control valve fitted in the cold water line to the water heater (refer to page 48) may 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.