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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 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 36).
•
Continuous dribble
Try gently raising the easing lever on the relief valve for a few seconds (refer
"Relief Valves"
to
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
the water heater is cold - then stops until water reheats
The gas control must be turned off using the knob on top of the gas control
thermostat (refer to
Service or their nearest Accredited Service Agent to arrange for inspection.
CAN'T LIGHT THE PILOT FLAME
•
Is there gas to the water heater?
Check the gas isolation valve on the gas supply line
is open.
•
Is there a normal gas supply to the rest of the
premises?
Try lighting another gas appliance to check. If there
is no gas, call the gas supplier.
cold water connection diagram
on page 9). This may dislodge a small particle of foreign
"Close Down Procedure"
25
SAVE A SERVICE CALL
on page 48). Phone Rheem
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