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OK, I'm a newbie but I promise I did try to answer this question by reading the pevious threads related to chatter first!
I just replaced my old pressure pump with a Grundfos 1/2 HP JPS-2A jet pump. This unit comes with SQUARE-D pressure switch attached to the housing, pre-set at 30/50 psi.
My installation is pretty simple, I'm using the pump as a pressure pump connected to a 119 gallon Flexcon pressure tank which is pre-charged to 28 psi. The pump is gravity fed by a 5,000 gallon cistern so it doesn't have to "suck" any water. All inlet and outlet plumbing is 1" and I have located the pressure tank "as close as possible" to the pump. Total run between pump outlet and pressure tank inlet is only about 3 feet with two 90° bends. I have a 1" check valve right at the pump outlet, this worked fine on my prior installation BUT the pressure switch was located "down stream" of the check valve.
Once the pressure gets up to about 40 psi the pressure switch starts to "chatter" cutting the pump on and off. Lots of visible arcing across the contacts so I cut power immediately.
Since there was water @ 40 psi in the tank I carefully bled all the lines (hot and cold water) and made sure there was no trapped air. Alas, that had NO effect, chatter ocurred again once the pressure built up to ~ 40 psi.
In reading the other posts, I figure that the problem is:
a) Pressure switch needs to be moved "down stream" of check valve, as close to the pressure tank as possible.
b) Check valve needs to be moved to pump INLET.
c) a + b
Neither of these fixes will be particularly easy but if I'm going to fix it, I'd like to "do it right" and make it as maintenance free as possible for the future. Any advice and suggestions are greatly appreciated!
I just replaced my old pressure pump with a Grundfos 1/2 HP JPS-2A jet pump. This unit comes with SQUARE-D pressure switch attached to the housing, pre-set at 30/50 psi.
My installation is pretty simple, I'm using the pump as a pressure pump connected to a 119 gallon Flexcon pressure tank which is pre-charged to 28 psi. The pump is gravity fed by a 5,000 gallon cistern so it doesn't have to "suck" any water. All inlet and outlet plumbing is 1" and I have located the pressure tank "as close as possible" to the pump. Total run between pump outlet and pressure tank inlet is only about 3 feet with two 90° bends. I have a 1" check valve right at the pump outlet, this worked fine on my prior installation BUT the pressure switch was located "down stream" of the check valve.
Once the pressure gets up to about 40 psi the pressure switch starts to "chatter" cutting the pump on and off. Lots of visible arcing across the contacts so I cut power immediately.
Since there was water @ 40 psi in the tank I carefully bled all the lines (hot and cold water) and made sure there was no trapped air. Alas, that had NO effect, chatter ocurred again once the pressure built up to ~ 40 psi.
In reading the other posts, I figure that the problem is:
a) Pressure switch needs to be moved "down stream" of check valve, as close to the pressure tank as possible.
b) Check valve needs to be moved to pump INLET.
c) a + b
Neither of these fixes will be particularly easy but if I'm going to fix it, I'd like to "do it right" and make it as maintenance free as possible for the future. Any advice and suggestions are greatly appreciated!