™ Solar Pool Heating System -- Installation & User Manual
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3) If air bubbles stop reliably at this point then the vacuum valve is now at the required positive pressure, the
pressure gauge should read a value near the head pressure (vertical distance from vacuum release and
pressure gauge) + a few kPa’s, this is ideal.
4) Leave the ball valve brake at this setting/constriction permanently (remove handle).
5) If the required constriction is greater than 50% you will need a stronger pump.
The following procedure for a manual system need be carried out only once during installation.
1) Open the three way ball valve (9, see plumbing diagrams) using the lever handle by a small increment.
2) Wait to see if there is sufficient flow and back pressure to create positive pressure at the vacuum valve (7).
3) If after some time air bubbling is still present in the return line, open the three way valve (9 see plumbing
diagrams) by another small increment.
4) If air bubbles stop reliably at this point then the vacuum valve is now at the required positive pressure.
5) Fix in place a back stop on the ball valve lever handle at this travel point, as this will be your maximum
opening point for your three way valve when turning the heating system on again.
For an over-sized solar pump (13, see plumbing diagrams) we recommend the following procedure, carried out only
once during installation, to limit pressures inside the panels.
1) Removed any potential constrictions in the return line going back into the pool such as eyeballs in the return
2) If pressure is still too great (as measured at the pressure gauge, see above Pressure Check Procedure, install
a by-pass ball valve (19) (see plumbing diagrams).
3) Turn the solar pump on with the by-pass-ball valve fully open.
4) Constrict the by-ball valve in small increments until you get the correct pressure, see above.
5) Fix the by-pass ball valve handle in place by some means.
Over-sized pumps and flow rates could potentially limit the lifetime of your collectors
due to pressure working. Note, the return line to the pool MUST be unconstricted, with
an appropriate number of pool outlets so as not to create significant back pressure.
Use the below procedure for solving air bubbling issues, DO NOT remove or drop the
level of the vacuum release valve or increase pump strength. The vacuum release valve
MUST be mounted as specified to ensure collectors are not pressure worked.