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Old 05-12-2012, 05:52 AM   #1
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40-60 pressure square "D" switch


I just installed a new Square D 40-60 pressure switch and adjusted it to around 38-50. I came home from work and the aerator tank was very low. When I took the cover off the switch I carefully pushed the contacts together and ran up to 70 and I had cut it off. Then I drained the water pressure to 50 and it ran fine after a few days then it started the bad cycle again. I also noticed the contact points are off set at times is this normal? Is it a bad switch or can I adjust it?

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Old 05-12-2012, 06:55 PM   #2
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40-60 pressure square "D" switch


You read the installation instructions, right? Been awhile since I did mine, but I think it went like this:

Drain all water from the tank.
Pressurize the tank to about 2 pds below the low range ( so 38 pds).
Apply electricity.

If you don't drain it first, (and in so doing, bring the pressure down to something very low), it won't work right.
The instructions should also tell you if you loosen the nut, it is about (I think) 4 pounds for every FULL turn.

Good luck!

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Old 05-12-2012, 10:06 PM   #3
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40-60 pressure square "D" switch


You don't have to drain it to adjust the switch AFAIK, just to adjust the pressure tank.
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Old 05-13-2012, 06:01 AM   #4
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40-60 pressure square "D" switch


Thanks for the information. I did not realize the bladder pressure in the tank had something to do with the pressure switch. I do not think I lost any pressure in the tank but sure will check it.
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Old 05-13-2012, 11:34 AM   #5
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40-60 pressure square "D" switch


Note my post above. You do need to let the water pressure off the system before checking the pressure in the bladder tank. It should be about 2psi below the cut on pressure of the switch.
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Old 05-13-2012, 12:48 PM   #6
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40-60 pressure square "D" switch


just a general question why is it that people want to adjust a factory set switch out of the box

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