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SAFETY, WARNINGS, INSTALLATION NOTES
RELIEF VALVES
Temperature Pressure Relief Valve
This water heater incorporates a temperature pressure relief
valve located near the top of the solar storage tank. 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. This quantity
should be equal to approximately 1/50 of the hot water used,
as water expands by this volume when heated.
Expansion Control Valve
In many areas, including South Australia and scaling water
areas, it is mandatory an expansion control valve 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 temperature 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
"Temperature Pressure Relief Valve or Expansion Control
Valve Running"
on page 23.
lift until water
Warning: Never block the outlet of either valve or their
outlet /
flows from the
drain lines for any reason. A relief valve drain must be left open
drain line –
drain line
to atmosphere, and be installed in a continuously downward
lower gently
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.
The easing lever on the temperature pressure relief valve and expansion control valve should be operated
once every six (6) months to clear any deposits and ensure the valve and its drain line are not blocked. It is
"Minor Maintenance Every Six Months"
very important the lever is raised and lowered gently. Refer to
on
page 17.
If the relief valve easing 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.
Warning: Water discharged from the temperature 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 solar storage tank 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 temperature 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
"Water Supplies"
where there is a high incidence of water deposits. Refer to
on page 19.
10
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