SAFETY, WARNINGS, INSTALLATION NOTES
8
RELIEF VALVES
Temperature Pressure Relief Valve
This water heater incorporates a temperature pressure relief valve
located near the top 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. 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, Western 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
Pressure Relief Valve or Expansion Control Valve Running”
page 34.
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 temperature 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.
Refer to
“Minor Maintenance Every Six Months”
on page 29.
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 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 your nearest Solahart Dealer 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
where there is a high incidence of water deposits. Refer to
on page 30.
outlet /
drain
line
lift until water
flows from the
drain line
–
lower gently
