Rheem GAS BOOSTED SOLAR WATER HEATER Service Manual download pdf (Page 61)

DRAINING THE WATER HEATER

HEAT EXCHANGER

Warning: Exercise care, as fluid discharged from the heat exchanger may be of a very high temperature.

To drain the 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.

The solar monitor located on the lower front cover is connected to the solar control module by a ribbon

cable. The ribbon cable has sufficient length to enable the removal of the lower front cover and for it to

be set to one side of the opening without disconnecting the ribbon cable from the solar control module.

The ribbon cable can be disconnected from the solar control module if it is necessary to remove the

lower front cover completely from the work area in front of the solar storage tank.

At the completion of this procedure, if the ribbon cable from the solar monitor has been disconnected,

reconnect it to the solar control module prior to replacing the lower front cover.

Attach a 12 mm (½”) diameter clear hose to the heat exchanger drain valve hose tail connection (refer to

step 5 of “Attach Closed Circuit Fluid Level Hose” on page 49).

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 16 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.

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Rheem GAS BOOSTED SOLAR WATER HEATER Service Manual Page 61