23
System Pressure
The recommended system pressure is 1 bar + 0.1bar/ 1m static height.
Expansion Vessel
IMPORTANT: On systems up to 12m
2
Collector area, prior to filling the system, the expansion vessel
pressure must be set 0.3 Bar below the system pressure. Omitting to perform this check will result in
irregular pressure readings during the commissioning of the system.
The pressure is checked at the base of the vessel and the bleed valve may be bled or
topped up with a pump.
Filling the Loop
It is important that a motorised flush and fill centre is used to fill and pressurise the
system with Solar Antifreeze Fluid as follows:
1. Open the fill and drain valves to allow the liquid to circulate around the solar loop
2. Turn the hot and cold temperature gauges 45˚ clockwise.
3. Close the isolating valve above to the flow meter to ensure all air and liquid
passes through the fill centre to filter any air and contaminants.
4. Run the fill centre pump to circulate the Solar Antifreeze Fluid for approximately 30
minutes. (For East/ West systems, flush and fill each collector for approx. 30 minutes.)
5. Open and close the isolating valve intermittently to circulate air
bubbles which may accumulate in the sight glass.
6. Return isolating valve to closed position.
7.
When the solar loop has been purged of air, close the bottom/drain
connection – the fill centre will begin to pressurise the solar loop
8. Reopen the isolating valve above the flow meter fully.
9. Fill the loop until the pressure gauge just exceeds the required pressure and stop
the pump and immediately close the fill connection. Check pipe joints on the solar
loop for leaks and check that pressure is not lost over a 30 minute period.
10.
If all the plumbing is sound, set the system pressure by opening
the return connection until the required pressure is met.
11. Return the temperature gauges
to the original position.
12. The fill centre may now
be disconnected.
13. Cap the fill and drain points with
the brass covers provided.
Commissioning the System
Flush and Fill Centre
Fill
Drain
The pipes from the flush and fill centre
should be connected as shown in the
diagram.
