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1

Tuesday, November 10th 2015, 9:09am

Rapid on-off cycling during off hours.

Pump is 10 years old, never had a problem and works actually fine. It has Hunter SRC Plus controller. Pump has small pressure tank installed. Recently I noticed that during off hours (when system should stay shut) every 10-15 minutes pump makes 3-5 very rapid on-off cycles. I assumed that problem might be related to aging pressure tank but I was not sure.
Tank has valve like on car wheel and I tried to measure pressure inside of tank with tire pressure gauge.
It is stated on tank that it was pre-charged to 20psi but gauge shown no pressure.
Any ideas what could be a cause for that rapid on-off cycling ?
I appreciate any suggestions in advance.

Wet_Boots

Supreme Member

Posts: 5,376

Location: Metro NYC

2

Tuesday, November 10th 2015, 9:54am

You should power down the pump and drain the pressure tank and prepare to add air if it is needed.

If you have a modern diaphragm/bladder type of tank, the air part is supposed to be separate from the water, and a check for this involves depressing the tiny plunger in the Schraeder air valve, and not seeing water come out. Make sure the air pressure in the tank is about 2 psi less than the cut-in pressure on the pump.

If you have an old-fashioned air tank, with air and water touching, you have to pressurize (same 2 psi differential) the whole tank with air, then turn the pump back on.

3

Tuesday, November 10th 2015, 11:48am

Tank model is Simer LT2. Installed horisontally

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