COMMISSIONING
49
18. Add water to top up the level of the closed circuit fluid in the heat exchanger if required.
To add water to the closed circuit fluid:
If not already removed, disconnect the drain line and remove the spring clip from the solar circuit relief
valve at the top of the solar storage tank and remove the valve (refer to step 6).
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.
Undo the compression nut on the solar cold pipe at the top of the solar storage tank and remove the
pipe work from the fitting.
Place a funnel in the solar cold connection fitting at the top of the solar storage tank.
Add water slowly through the funnel until the level of fluid in the hose is at the desired level as marked
on the solar storage tank.
Note: It may be necessary to either lift the funnel slightly to allow air to escape around the funnel
whilst filling.
Remove the funnel from the solar cold connection fitting.
Position the solar cold pipe correctly in its fitting and tighten the compression nut.
19. Drain closed circuit fluid from the heat exchanger if required.
To drain closed circuit fluid:
If not already removed, disconnect the drain line and remove the spring clip from the solar circuit relief
valve at the top of the solar storage tank and remove the valve (refer to step 6).
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.
Place the end of the solar fluid hose into a graduated volumetric container and drain closed circuit
fluid until the level of fluid in the hose is at the desired level as marked on the solar storage tank.
It may be necessary to drain off the closed circuit fluid in small amounts, raising the hose back to the
top of the solar storage tank and noting the level of the closed circuit fluid in the clear hose each time,
so as not to drain below the desired level.
Note: 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 fluid and
remove from site for appropriate disposal.
Re-affix the hose to the same location on the side of the solar storage tank.
20. If water has been added to or closed circuit fluid has been drained from the heat exchanger, recommence
this procedure from step 10.
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