Question about Amtrol ST-12-C THERM-X-TROL ASME Expansion Tank, 5 Gallon

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When setting my tank pressure at 28 Lbs my pump will dhit down to

I set my tank pressure 28Lbs and my house pressure will not go up to the 50Lbs and shut down. it shuts down at 30Lbs and also the contacts lock up and shuts down the pump for a a minute before it will restart?
My pressure switch is a 30-on 50 off?

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If your numbers are correct then your pressure switch is bad

Posted on May 19, 2009

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Posted on Jan 02, 2017

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1 Answer

My boiler has a squeeling sound during the warmu up. I think it is coming from the expansion tank?


The squealing sound generally comes from a circulator pump, if it has a drive coupling between motor and impeller housing there is an oil cup/or oil hole, add oil until it is full! If it is a cartridge style circulator you may have to replace it.

Sometimes air in a system will cause this squeal noise as well. Purging the air out of system may be required. If you need to know how to purge a system there is a good pdf file at this link for $8.95 The Basics of Purging Air
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The Expansion tank is factory set to 12 psi and the only way to tell if it remains with 12 psi is to drop the system pressure to zero and check the tank with a pressure gauge. If water comes out the air valvestem when you apply the pressure gauge, the tank is bad, replace it! If there is less then 12 psi on the tank add air to 12 psi and open water valves back up to normal operating pressure. Usually the feed valve will automatically stop at the preset setting.If the boiler is leaking water out any relieve valve drains, the feed valve, relief valve and or expansion tank may need to be replaced.

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My AMTROL water well tank is copying the pressure of the prussure switch


Sand the points on the pressure switch
Replace pressure switch
http://www.amazon.com/dp/B000BQSERE/?tag=waterheaterti-20

Test you are getting 240Volt to pressure switch
Turn breaker fully off and then fully back on

Replace control box or replace start capacitor:
http://www.amazon.com/dp/B0060C7GFO/?tag=waterheaterti-20

Drain tank, and replace the air valve
http://www.amazon.com/dp/B000BQYKJK/?tag=waterheaterti-20

Gene

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How does a home well water system work?


Deep well.
Pressure valve located on front of above-ground-storage-tank will turn pump on-off depending on amount of water pressure inside tank.
When water is consumed inside home, the pressure valve responds to the lower pressure and closes electrical contacts... sending electricity to water well pump located deep underground.
The pump turns on and lifts water through a pipe into the above ground storage tank.
When the tank is full of water, the pressure valve senses the higher pressure and turns off electricity going to pump
Pump shuts off.
There is a one-way check valve on the water line going down to pump, and this keeps water from flowing back down into well.
The above ground tank maintains water pressure for the house.
When pressure is reduced by taking a shower, the pressure valve turns pump on again, and cycle repeats.

Aug 20, 2014 | Water Heaters

1 Answer

Greenstar 30si


this is your safety valve letting by first try and check ur pressure bladder shud b 28lbs squr inch if it isnt pump up to 28 what happens if the bladder has no pressure then the water has no were to go but out through to pipe water expands when hot and thats why un have to top up the other problm is safty valve worn out needind replacment hope this helps u Susan

Sep 21, 2013 | Water Heaters

1 Answer

How do you inscrease the pressure setting on a watts 740 relief valve. It is suppose to be adjustable to 75 lbs and I see nowhere to adjust it.


Hello The 740 is NOT EVER!!! adjusted.It is factory set.It can be purchaced at any PRE-set rating from 30-75 LBS.You MUST match the rating of the old one.If in doubt use the 30# to be safe.

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Hello,


The pressure tank psi may be too high. To set it you get the system to pressure up and stop then check that water pressure. Whatever that is, is what the tank should be set at. Too much air pressure and the water pressure will suddenly drop before the pump kicks in.
To set the tank properly turn off the pump, drain all water pressure, then set the air pressure in the tank to the same as the water pressure was. Turn it back on and check again.

Apr 14, 2017 | Water Heaters

1 Answer

Pop off valve releasing water. House pressure between 50 and 60 lbs. Plenty of hot water, set at 135 degrees. Not a lot of water but still release water regularly.


A build up of minerals in the water can cause this. You'll need to replace the pressure release valve. If your a DIYer it's not a nery difficult job as long as you make sure you get the exact replacement valve and take the necessary precautions to relieve tank pressure before beginning.

Feb 22, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Water pump cycles to often. When pump turns on, pressure gauge shoots up to 50 lbs right away without pumping much water.


Sounds like a well fed system with a pressure tank that has lost its air charge. Check for a water tank with a tire pressure type stem fitting, should also have a pressure gauge. Most newer tanks have a rubber diaphram inside to keep the air and water from mixing, but a lot of older ones don't and the newer ones will develope a leak that will produce the simpoms you describe. Try adding a few pounds of air pressure to the top of the tank and check for leaks. Warning: Compressed air can escape explosivly if the tank is badly rusted out but if your water pressure goes to 50# without the tank leaking, it should be safe to add up to 25# of air. The air charges the water system and allows the pump to shut off until enough water is used to lower the pressure back to set points on the control switch. It's not a good idea to adjust the set points on the switch unless all parts in the system have been checked for safety to the new pressures.

Aug 13, 2009 | Water Heaters

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