51
operation of the solar cart). The Solar System
should not be flushed nor pressure tested
with water only as it is not always possible
to completely drain all the water from the
system upon completion and this can result
in an increase freezing risk of the system.
The Solar System should be flushed using
the Flush & Fill Cart for a period of at least
15 minutes to ensure the fluid is completely
deaerated. During this operation it is good
practice to momentarily open the Restrictor
Flow Valve (3) to ensure any trapped air in
this region is cleared.
After flushing for 15 minutes the following
procedure should then be undertaken :
Close the Drain Valve (2) whilst the Flush
and Fill Cart is still running. Carefully monitor
the system pressure on the Pressure Gauge
(6) and allow to increase to the
recommended cold-fill pressure.
Once the recommended cold-fill is reached
in the system the Flow Valve (3) should be
shut and the power to the Flush & Fill cart
turned off.
Monitor the system pressure gauge for any
drop in pressure that may indicate a leak in
the pipework.
Open the Restrictor Flow Valve (3) so that
the slot is in a vertical position.
Close the Cold Check Valve (4) by turning so
that the 90° indicator is facing upwards (i.e.
the gauge is now in the correct orientation).
Close the Hot Check Valve (5) by turning so
that the 90° indicator is facing upwards (i.e.
the gauge is now in the correct orientation).
Manually vent any air in the system from the
Manual Vent Port (6)
The Solar Loop Circulating Pump should
then be run on its highest speed using
pump speed selector (7) for 15 to 30
minutes. Refer to The Solar Controller
Operation Manual to run the pump in
continuous mode. (Remember to return the
controller to automatic mode after
commissioning).
If necessary manually vent any air in the
system from the Manual Vent Port (6)
Select the required pump speed for normal
operation using the pump speed selector (8)
and regulate the flow using the Restrictor
Cool Tip
Set the Flow Rate through the
collector array to :
0.1 litre / minute / tube
That is :
1 litre / minute for 10-tubes
2 litres / minute for 20-tubes
3 litres / minute for 30-tubes