22
TEMPERATURE PRESSURE RELIEF VALVE OR EXPANSION CONTROL VALVE RUNNING
Normal Operation
It is normal and desirable the temperature pressure relief valve or expansion
control valve (if fitted) allows a quantity of water to escape during the heating
cycle. This quantity should be equal to approximately 1/50 of the hot water
used, as water expands by this volume when heated. However, if it discharges
more than a bucket full of water in 24 hours, there may be another problem.
The expansion control valve (if fitted) will discharge water instead of the
temperature pressure relief valve as it has a lower pressure rating. A benefit is
that energy is conserved as the discharged water is cooler. This valve is
installed in the cold water line to the water heater (refer to the
on page 45).
Continuous dribble
Try gently raising the easing lever on the relief valve for a few seconds (refer
to
on page 8). This may dislodge a small particle of foreign
matter and clear the fault. Release the lever gently.
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 from the temperature pressure relief valve until water heater is cold -
then stops until water reheats
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.
PRESSURE RELIEF VALVE DISCHARGING
A pressure relief valve is incorporated into the gas booster controls. This valve protects the gas booster, by
allowing water to escape, in the event of excessive pressure build up in the waterways.
Normal operation
A small volume of water may discharge from the bottom of the gas booster when a hot tap is suddenly
closed.
Continuous dribble
A continuous dribble may indicate the water supply pressure is above
the design pressure for the gas booster. If so, a pressure limiting valve
must be installed on the cold water supply pipe to the water heater (refer
to
on page 26).
CLOUDS OF WHITE ‘VAPOUR’ FROM THE FLUE TERMINAL
During the heating cycle, it is not unusual to see water vapour clouds
steaming from the flue terminal, particularly on cold days. This is normal
operation of the gas booster.
ERROR CODE
The gas booster provides a diagnostic error code in the event of an
interruption to its operation. The error code is displayed on the LED display
on the front of the gas booster as a numerical value. If an error code appears:
Close the hot tap and switch off the electrical supply to the water heater.
Check the gas isolation valve at the gas inlet to the water heater is fully
open.
Wait 5 minutes, then switch on the electrical supply to the water heater
and open a hot tap.
If the error code persists, take note of the numerical code and turn off the
hot tap. Phone Rheem Service or their nearest Accredited Service Agent to
arrange for inspection.
