Specifications

DRAINING THE CLOSED CIRCUIT – 52H / RLX SERIES

It is recommended to drain the solar collectors and heat exchanger every five years. The closed circuit fluid

should be checked and if necessary replaced. Draining the solar collectors and closed circuit should be

conducted within three hours of sunrise, when the closed circuit fluid temperature inside the solar collectors

is lower.

To drain the solar collectors and closed circuit:

Cover the solar collectors to prevent solar radiation gain.

Failure to do so may cause a safety issue.

Open a hot water tap and allow the water to run for five minutes immediately prior to draining the solar

storage tank.

This will assist in the transfer of any heat from high temperature closed circuit fluid in the solar collectors

to the water in the solar storage tank.

Close the hot water tap.

Warning: Exercise care to avoid splashing of closed circuit fluid, as fluid discharged from the solar

collectors may be of a very high temperature.

Note: The closed circuit fluid discharged from the solar collectors can render the water in a rain water tank

unusable and should be diverted away from any rainwater tank connected to the roof.

Operate the closed circuit pressure relief valve on the right side of the solar storage tank to relieve the

pressure from the closed circuit.

Warning: Relieved air or closed circuit fluid may be hot.

System with Fill Plug Assembly: Remove the screw from the Fill Plug Assembly (used on collectors with

conetite fittings) and attach a hose to the assembly.

Place the end of the hose into a container.

System with Service Valve: Attach a hose to the spigot and open the Service Valve (used on collectors

with screwed fittings).

Place the end of the hose into a container.

Remove the retaining clip and the closed circuit pressure relief valve from the tank vent socket.

Allow the closed circuit fluid to drain into a container and dispose of in accordance with the relevant local

authority.

Warning: Closed circuit fluid may be hot.

To fill the solar collectors, refer to “To Fill The Closed Circuit” on page 57.