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• Close the isolation valves on the cold and hot water branches to shut down an individual water heater in a
bank.
TO TURN ON THE WATER HEATER
WARNING: If you smell gas do not attempt to turn on the water heater.
• Fill the system with water (refer to "To Fill the Water Heater" on page 99.
• Open the gas isolation valve fully at the inlet to the water heater.
• Switch on the electrical supply at the supply isolator for the water heater.
NOTE: If the water heater is correctly installed, and there is a call for heat, this will also activate the
circulating pump. The water heater will operate automatically when a call for heat occurs.
RELIEF VALVES
Pressure Relief Valve
This water heater incorporates a pressure relief valve located near the top, at the rear of the water
heater. This valve is essential for the water heater's safe operation.
It is possible for the valve to discharge a quantity of water through the drain line during each heating
period.
Expansion Control Valve
In many areas, including South Australia, Western Australia and scaling water areas, it is mandatory
an expansion control valve or expansion tank is fitted to the cold water line to the water heater.
The expansion control valve will discharge the quantity of water from its drain line during the heating
period instead of the pressure relief valve as it has a lower pressure rating.
Valve Operation
Continuous leakage of water from either valve and its drain line may indicate a problem with the water
heater. Refer to "Pressure Relief Valve Running" on page 13.
Warning: Never block the outlet of either valve or their drain lines for any reason. A relief valve
drain must be left open to atmosphere, and be installed in a continuously downward direction.
In locations where water pipes are prone to freezing, the relief valve drain line must be insulated and
not exceed 300 mm in length before discharging into a tundish through an air gap.
Operate the easing lever on the pressure relief valve and expansion
control valve once every six (6) months to clear any deposits and
ensure the valve and its drain line are not blocked. It is very important
the lever is raised and lowered gently.
Warning: Water discharged from the pressure relief valve drain line
will be hot. Exercise care to avoid any splashing of water by standing
clear of the drain line's point of discharge when operating either valve's
easing lever.
DANGER: Failure to operate the easing lever on the relief valve
once every six (6) months may result in the water heater cylinder
failing, or under certain circumstances, exploding.
If water does not flow freely from the drain line when the lever is lifted, then the water heater must be
checked. Phone Rheem Service or their nearest Accredited Service Agent to arrange for an
inspection.
The pressure relief valve should be replaced at intervals not exceeding five (5) years and the
expansion control valve should be checked for performance or replaced at intervals not exceeding
five (5) years. The checking of the valves performance or replacement should occur more frequently
in areas where there is a high incidence of water deposits. Refer to
INSTALLATION NOTES
This water heater must be installed:
•
by a qualified person,
•
in accordance with the installation instructions,
"Water Supplies"
8
lift until water
flows from the
drain
drain line –
line
lower gently
on page 18.
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