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HEAT EXCHANGER
Warning: Exercise care, as fluid discharged from the heat exchanger may be of a very high temperature.
To drain the closed circuit heat exchanger:
Switch off the electrical supply at the power outlet to the solar storage tank.
Remove the lower front cover from the solar storage tank.
Attach a 10 mm (3/8") diameter clear hose to the heat exchanger drain valve hose tail connection (refer
"Attach Closed Circuit Fluid Level Hose"
to step 4 of
Disconnect the drain line from the solar circuit relief valve at the top of the solar storage tank. Remove the
spring clip from the solar circuit relief valve and remove the valve.
Warning: The solar circuit may be under pressure. Take care when removing the solar circuit relief
valve, as a sudden discharge of pressurised hot vapour may be experienced. This discharge will create a
sharp sound of vapour being released.
Open the heat exchanger drain valve and remove the plug from the end of the hose.
The closed circuit fluid will flood the hose.
Place the end of the hose into a container and drain the closed circuit fluid from the heat exchanger.
Note: The heat exchanger can contain up to nine (9) litres of closed circuit fluid. A suitably sized container
should be used to accommodate this amount of fluid.
The closed circuit fluid contains food grade additives (rust inhibitor, anti-freeze agent, colour) and is
harmless to the environment. However, it is good practice to recover any excess closed circuit fluid and
remove from site for appropriate disposal.
DRAINING THE WATER HEATER
on page 50).
61
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