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well pump/relay setup Chuck (in SC) 07-20-2007
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Posted by Chuck (in SC) on July 20, 2007, 11:10 pm
I know we discuss it here very often.. but now I need a refresher..
Working on a well system for a submersible pump. Had a bad gauge on
it and was at times not wanting to cut off at high pressure...

I replaced the gauge, and cut in / out switch. and pre loaded air
charge in bladder tank.. per tank instructions ie: "with no pressure
or water in bottom of tank, air pressure in bladder should be 2 lbs
less than cut in pressure of switch"
The switch is in at 40, cut out at 60..

Shouldn't this switch /relay be closed when it's sitting on the
shelf.. it being less than 40 psi?

I want to think I've got a bad switch.. it's a Lowes made in china..
Won't be going back there (the old home place) till Sunday.. Any ideas
are appreciated..

Chuck (in SC)

Radiant Heat 468x60
Posted by Jeff Wisnia on July 20, 2007, 11:38 pm
Chuck (in SC) wrote:
> I know we discuss it here very often.. but now I need a refresher..
> Working on a well system for a submersible pump. Had a bad gauge on
> it and was at times not wanting to cut off at high pressure...
>
> I replaced the gauge, and cut in / out switch. and pre loaded air
> charge in bladder tank.. per tank instructions ie: "with no pressure
> or water in bottom of tank, air pressure in bladder should be 2 lbs
> less than cut in pressure of switch"
> The switch is in at 40, cut out at 60..
>
> Shouldn't this switch /relay be closed when it's sitting on the
> shelf.. it being less than 40 psi?
>
> I want to think I've got a bad switch.. it's a Lowes made in china..
> Won't be going back there (the old home place) till Sunday.. Any ideas
> are appreciated..
>
> Chuck (in SC)

Well, if it's truly a switch AND relay, the switch WILL be closed, but
the relay WON'T since it needs voltage to energize its coil (Said
voltage being controlled by the switch.) and there's no voltage supplied
to it when it's "on the shelf".

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.98*10^14 fathoms per fortnight.

Posted by M Q on July 20, 2007, 11:46 pm
Chuck (in SC) wrote:

> I know we discuss it here very often.. but now I need a refresher..
> Working on a well system for a submersible pump. Had a bad gauge on
> it and was at times not wanting to cut off at high pressure...
>
> I replaced the gauge, and cut in / out switch. and pre loaded air
> charge in bladder tank.. per tank instructions ie: "with no pressure
> or water in bottom of tank, air pressure in bladder should be 2 lbs
> less than cut in pressure of switch"
> The switch is in at 40, cut out at 60..
>
> Shouldn't this switch /relay be closed when it's sitting on the
> shelf.. it being less than 40 psi?

Sounds like it should be. Are you sure that you have the correct
terminals (there may be both NO and NC terminals).
The ones that am am familiar with have a cover that you can
take off and see the contacts.
>
> I want to think I've got a bad switch.. it's a Lowes made in china..
> Won't be going back there (the old home place) till Sunday.. Any ideas
> are appreciated..
>
> Chuck (in SC)


Posted by Chuck (in SC) on July 21, 2007, 12:14 am
wrote:

>Chuck (in SC) wrote:
>
>> I know we discuss it here very often.. but now I need a refresher..
>> Working on a well system for a submersible pump. Had a bad gauge on
>> it and was at times not wanting to cut off at high pressure...
>>
>> I replaced the gauge, and cut in / out switch. and pre loaded air
>> charge in bladder tank.. per tank instructions ie: "with no pressure
>> or water in bottom of tank, air pressure in bladder should be 2 lbs
>> less than cut in pressure of switch"
>> The switch is in at 40, cut out at 60..
>>
>> Shouldn't this switch /relay be closed when it's sitting on the
>> shelf.. it being less than 40 psi?
>
>Sounds like it should be. Are you sure that you have the correct
>terminals (there may be both NO and NC terminals).
>The ones that am am familiar with have a cover that you can
>take off and see the contacts.

nope.. single throw..


>>
>> I want to think I've got a bad switch.. it's a Lowes made in china..
>> Won't be going back there (the old home place) till Sunday.. Any ideas
>> are appreciated..
>>
>> Chuck (in SC)


Posted by Paul Franklin on July 21, 2007, 6:26 am
On Fri, 20 Jul 2007 23:10:35 -0400, "Chuck (in SC)" <> wrote:

>I know we discuss it here very often.. but now I need a refresher..
>Working on a well system for a submersible pump. Had a bad gauge on
>it and was at times not wanting to cut off at high pressure...
>
>I replaced the gauge, and cut in / out switch. and pre loaded air
>charge in bladder tank.. per tank instructions ie: "with no pressure
>or water in bottom of tank, air pressure in bladder should be 2 lbs
>less than cut in pressure of switch"
>The switch is in at 40, cut out at 60..
>
>Shouldn't this switch /relay be closed when it's sitting on the
>shelf.. it being less than 40 psi?
>
>I want to think I've got a bad switch.. it's a Lowes made in china..
>Won't be going back there (the old home place) till Sunday.. Any ideas
>are appreciated..
>
>Chuck (in SC)

Some of these also have a low pressure cut-out to prevent the pump
running dry. Is there a lever on the side of the switch housing? If
so, you have to use the lever to mechanically actuate the contacts
long enough to build up the minimum pressure before the automatic
action will take over. Once the pressure builds over 5 PSI or so, you
release the lever and the switch will work as you would expect.

HTH,

Paul


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