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2 - 3 psi below the cut-in pressure of the pump (refer to pump instructions for details). This
pressure adjustment is best done before installation of the tank, using a car-type pressure
gauge to determine when the required pressure is reached, as follows:
i.
Depress the central pin of the Schrader valve with your finger, to release
gas
ii.
Release gas a little at a time, until the pressure is correct
iii.
If you release too much gas by mistake, air may be pumped back in with
a hand - or foot-pump.
WARNING
Make sure that there is adequate ventilation when setting or
adjusting pressure in an accumulator tank. Nitrogen is non-
toxic, but oxygen levels may be reduced in confined spaces.
If the tank pressure requires adjustment after installation, ensure first that the pump is switched
off and that an outlet is open, so that there is no pressure in the system. Then regulate the
pressure as indicated above.
Check the accumulator tank performance in this way every 6 months, and adjust the pressure if
necessary.
EXAMPLE
Pump Cut-in
Pressure
1 bar (15 psi)
0.7 bar (10 psi)
0.5 bar ( 7 psi)
Winter precautions
To avoid risk of frost damage, drain all the water from your pressurised water system, before
winter lay-up. Switch off the pump, open all outlets until flow ceases. This will allow water to
be expelled from the accumulator tank. Drain all remaining water from the lowest point in the
system. Remember to drain your calorifier from the bottom (cold-water inlet)
Temperature range.
Cleghorn Waring accumulator / expansion tanks are designed for use within the temperature
range 0 to 90ºC.
Acc. Tank
Pressure setting
0.8 bar (12 psi)
0.5 bar (7 psi)
0.3 bar (5 psi)
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