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

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How do I change a amtrol thermal expansion take, Is it as easy to unscrew and put the new one after shutting of the water supply

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Yes. After attaching the new one,check air preasure with a tire gage to match the recomandation that come with the tank.

Posted on Feb 23, 2009

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My A.O. Smith 8 year old water heater drips water out of the expansion valve but only when it is heating water. The builder of my home mounted the Amtrol THERM-X-TROL ST-5 in the horizontal position and I...


It seems that you have this figured. In their literature all units are shown vertical, either inlet up or inlet down. Also, it appears that if the unit is full of water, (water logged) pressure will build up in the system. Temporarily, you could shut off water to the water heater, open some drains and use a pump to put some air back into the tank. This would at least get air into the upper half of the tank for a while until you can get set to make a repair.
Gary

Dec 14, 2010 | Amtrol ST-5-C THERM-X-TROL ASME Expansion...

1 Answer

Brief Motor boat sound transmits thru the house when kitchen,bath,or shower first turned on.How do I trouble shoot the thermal expansion tank Amtrol ST 5.


The easiest way I know of is to remove cap from air valve on top of tank and check pressure with tire gauge.If you get water out of valve then air bladder is bad and tank will need to be replaced. If you don't get water but no pressure then reinflate to 3-5 PSI. Hope this helps. Thanks

Nov 11, 2010 | Amtrol ST-5-C THERM-X-TROL ASME Expansion...

1 Answer

My Amtrol Therm-x-trol tank has dropped 6 to 8 inches since it was installed, and a few drops of water are coming from the washer where is attached to the water heater. It is very heavy now. Could it be...


Sounds like the internal diaphragm has ruptured. The tank should be replaced immediately. You should disconnect the electrical power to the water heater and close off the incoming water supply to the heater. Open a HW faucet to relieve the pressure and remove the tank. Be careful cause you are going to get wet. Replace with a new tank.

Sep 30, 2010 | Amtrol ST-5-C THERM-X-TROL ASME Expansion...

1 Answer

Water leaking in basement because there is a small leak in current expansion tank. can we stop water from leaking tonight and still have water to house? and are these tanks easy to replace?


Hi,
For tonight I would set a bucket under it to cathc the water from the leak. The tank will not start to leak much worse in the next few hours...
And, no it is not hard to change the tank. Just messy....:-) Becareful though as the tank may be heavy if the bladder has ruptured...
Simply use two wrenches and unscrew the tank and then tape or dope the threads and screw the new tank back on...just that simple...make sure you get a fresh water exspansion tank and not a heating one...

heatman101

Mar 30, 2010 | Amtrol ST-5-C THERM-X-TROL ASME Expansion...

1 Answer

When the water stops flowing, there is a sharp-thud sound presumably in the unit.


If your thermal expansion tank is older than three years, it is probably time to replace it. There is a diaphragm inside the tank that goes bad over time. Before replacing this tank, if you have recently purchased a new washing machine, this may be the problem if it does not have hammer arrestors on it as well.

Nov 18, 2009 | Amtrol ST-5-C THERM-X-TROL ASME Expansion...

1 Answer

I have an Amtrol 109 tank on my boiler mounted horizontally (all the literature shows the tank mounted vertically). Lately, the pressure on the boiler slowly bleeds off. I've been told the Amtrol tank may...


If you are losing boiler pressure, it is probably not the expansion tank. Most of the time when these go bad they fill with water and cause a increase in boiler pressure, especially when the boiler is running. If you put a tire gauge on the end of the tank it should read between 10 and 15 psi. If this is the case then the expansion tank is fine. If the tank is fine then you may have a leak somewhere in the system. The perculating that you refer to could also be from the boiler being under filled. Make sure all zones are purged of air and the boiler pressure reads around 12 psi on the gauge. Hope this helps

Oct 24, 2009 | Amtrol ST-5-C THERM-X-TROL ASME Expansion...

1 Answer

ER3 no hot water


Er3 means that the water is being heated for more than 1 hour without reaching the set temperature.
Need new aquastat.

Sep 28, 2009 | Amtrol ST-120V-C THERM-X-TROL ASME...

1 Answer

Air in hot water lines only after installing thermal expansion tank. tank is mounted below water line .


Does you system have an auto air vent - has a cap like tire valve. cap should be left loose.

Mar 05, 2009 | Amtrol ST-12-C THERM-X-TROL ASME Expansion...

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