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33-1197 Solahart Owner‟s Manual – Thermosiphon Systems - Revision H – Nov 2013

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Pressure Relief Valve - Six Monthly Maintenance
The easing gear of pressure relief valves fitted to your water heater system must be operated every six months to assure
their continuing function.

!

WARNING: FAILURE TO HAVE THE TEMPERATURE PRESSURE RELIEF VALVE EASING GEAR
OPERATED AT LEAST ONCE EVERY SIX MONTHS MAY RESULT IN THE WATER HEATER EXPLODING.
WARNING: NEVER BLOCK THE OUTLET OF A RELIEF VALVE OR ITS DRAIN LINE FOR ANY REASON.
CAUTION: IT IS VERY IMPORTANT THAT THE LEVER IS RAISED AND LOWERED GENTLY.

NOTE: CONTINUOUS LEAKAGE OF WATER FROM A RELIEF VALVE OR ITS DRAIN LINE MAY
INDICATE A PROBLEM WITH THE WATER HEATER.
TEMPERATURE PRESSURE RELIEF VALVE

This valve is fitted in the top of the water heater tank and is essential for its safe
operation. It is possible for the valve to release a little water through the drain line
during each heating period. This occurs as the water is heated and expands by
approximately 1/50 of its volume.
water
heater

The easing lever on the temperature pressure relief valve should be operated once
every six months. Refer to “Minor Six Month Maintenance” on page 8. If water
does not flow freely from the drain line when the lever is lifted, then the water
heater should be checked by your nearest Solahart Dealer.

!

WARNING: EXERCISE CARE TO AVOID ANY SPLASHING OF
WATER, AS WATER DISCHARGED FROM THE DRAIN LINE WILL
BE HOT. STAND CLEAR OF THE DRAIN LINE‟S POINT OF
DISCHARGE WHEN OPERATING THE VALVE‟S LEVER.

lift until water
flows from the
drain line –
lower gently

drain
line

The temperature pressure relief valve should be replaced at intervals not exceeding
5 years, or more frequently in areas where there is a high incidence of water deposits.
EXPANSION CONTROL VALVE

Solahart supply an expansion control valve with each thermosiphon water heater system and this is fitted to the cold water
line to the water heater. In many areas, including South Australia, Western Australia and scaling water areas, it is
mandatory this valve is installed. Water will flow from its drain line during the heating period.
The easing lever on the expansion control valve should be operated once every six months. Refer to “Minor Six Month
Maintenance” on page 8. If water does not flow freely from the drain line when the lever is lifted, then the water heater
should be checked by your nearest Solahart Dealer. The expansion control valve should be checked for performance or
replaced at intervals not exceeding 5 years, or more frequently in areas where there is a high incidence of water deposits.

Collector Care
Ensure the glass on your solar collectors is free of dust, salt spray or any other matter which may reduce the effectiveness of
the solar collectors. Rainfall should keep the collector adequately clean. It is recommended that the collector glass be
washed clean at least every three months should adequate rain not have fallen in this period. Collector glass can be hosed
down or if the solar collectors are accessible, wash the collector glass with water and a soft brush when the solar collectors
are cool, such as early in the morning. In extremely dusty areas, such as mining towns and locations adjacent to dust
forming plants, extra attention should be given to this matter.
Have any trees trimmed which may shade the solar collectors.