Question about Amtrol ST-120V-C THERM-X-TROL ASME Expansion Tank, 68 Gallon

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What psi do I set the tank at - Amtrol ST-120V-C THERM-X-TROL ASME Expansion Tank, 68 Gallon

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Hello The tank pressure must MATCH the system pressure it is instslled on.EX: 70 psi in the pipe = 70 psi in the amtrol.

Posted on Sep 04, 2010

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Posted on Jan 02, 2017

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WX-203 146S30, 32 Gal WELL-X-TROL Well Tank Stand low pressure upstairs


There is a schraeder valve at the top of the tank. Check the air pressure with a tire gauge. It should be two psi lower that the cut in pressure. eg: If you have a 40/60 pressure switch, the tank should read 38 psi.If it is lower, charge it up with air. If it loses the air again, the tank needs to be replaced. The gauge at the tank is rarely accurate so I would an outside sillcock pressure gauge to determine your system pressure so you can set the tank pressure properly. Good luck!

Apr 25, 2017 | Water Heaters

1 Answer

Why does the pressure rise to over 3bar when the central heating is in operation ?


3 Bar = 43.5 PSI When you heat water it always expands increasing pressure.
In a closed vessel volume can increase by 2-3%. Either expansion tanks allow for this and PSI is maintain or without an expansion outlet the PSI will increase in proportion to heat supplied.
Is this a low temp hydronic boiler operating at or <140F, a hi temp hydronic boiler @ >180F or steam boiler?

Oct 18, 2014 | Water Heaters

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I have a ideal mini c28 which is loosing pressure when the boiler is off, but when topped up and heating turned back on the pressure keeps rising


According to the laws of physics, pressure will rise as temperature increases and falls as temperature decreases in a closed system. The issue is how much does the pressure change for a given temperature change. The more air in the system, the less the pressure change, and vice versa. Vent your registers (pump must be off). If they are noisy from water flow, vent again. Let the boiler come up to temperature and shut itself off. Check the pressure at this point. If it is less than about 15 psi, add water to get it to 15 psi. If it is over 15psi, vent the surge tank to get to 15 psi. If your surge tank is totally full of water, you will have to find a way of getting air into it. Always check your pressure at the same water temperature to really know if you are losing water from the system.

Oct 17, 2014 | Water Heaters

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
From your Forced Hot Water System
&
Troubleshooting A Leaking Boiler
Relief Valve
Miller Furnace Books Repair

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.

Oct 09, 2014 | Amtrol EX-30 Diaphragm Expansion Tank...

1 Answer

How to top up the pressure on the boiler


According to the laws of physics, pressure will rise as temperature increases and falls as temperature decreases in a closed system. The issue is how much does the pressure change for a given temperature change. The more air in the system, the less the pressure change, and vice versa. Vent your registers (pump must be off). If they are noisy from water flow, vent again. Let the boiler come up to temperature and shut itself off. Check the pressure at this point. If it is less than about 15 psi, add water to get it to 15 psi. If it is over 15psi, vent the surge tank to get to 15 psi. If your surge tank is totally full of water, you will have to find a way of getting air into it. Always check your pressure at the same water temperature to really know if you are losing water from the system.

Sep 24, 2014 | Water Heaters

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I have a GE Profile Water Heater Model #SE40M12AA01.


I recommend safety changes to prevent ruptured water heater and assorted leaks.
135 degree hot water.
Maybe replace TP valve if it is dripping.
Drip pan under water heater with 3/4" drain line to outside.
Expansion tank on incoming cold water line to absorb pressure build-up, and prolong life of tank and plumbing.

Here's why:

1) Yes you can have scalding hot water.

2) I recommend 135 degrees since that will burn the evil right out of ya. And generally kill clothes washing bacteria.
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html

3) 150 is dangerous and can seriously burn skin in 1.5 seconds. Not safe around children and elderly.

4) Temperature settings on electric water heater are approximate, since thermostats are calibrated approximately, and read temperature through tank wall.

5) Also if you want to increase amount of hot water for high-consumption household, then setting tank temperature upward is one solution since more cold water is mixed with hot, so amount of hot inside tank goes further.

6) High temperature can cause TP valve to release water.
TP valve is pressure-temperature safety valve. Do NOT cap off.
Rating should be 125 psi and 180 degrees ... but all things water heater are approximate, and TP valves need replacement now and then.
It is not recommended by water heater manufactures to use 150 psi TP valve when water heater came with 125 psi. Rating shows in small print on end of TP. New TP valves sold at local hardware. Let tank cool before installing new one.

7) Higher temperature and high pressure can rupture tank.
Pressure over 80 psi shortens life of water heaters and plumbing fixtures. Put BTG100 pressure gauge on water heater drain valve to check pressure.

8) You need a drip pan with 3/4" drain line to outdoors, or to drain vent line, to prevent flood caused by ruptured water heater.
Turn water heater off when going on vacation.
Inspect water heater each 6 months.
Drip pan available at local home center or hardware:
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html#drip

9) Heated water expands and puts pressure on tank and pipes.
Water does not compress... so when water gets hotter it expands against tank wall and against pipes.
Especially in closed system (check valve present) when system is without expansion tank.
Expansion tank is installed on incoming cold water line.
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html#expansion

Oct 31, 2012 | Water Heaters

1 Answer

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

I have a Vaillant 624e boiler. I keep losing pressure. Then sometimes it shoots up to maximum. The pressure relief valve is also dripping sometimes. I am told it may be the expansion tank. Where is this...


The expansion tank is located on the header leaving the boiler. If it is a newer style than it will be a cylinder, most likely hanging above the boiler. It will have a valve on the bottom of the tank that looks like a tire or bicycle valve. If you put an air gauge on the valve stem it should read 12 psi, if it reads more, say closer to 30 psi, then the bladder is broke, and it should be replaced. If there is less than 8 psi, then there is probably a slow leak and the tank should be replaced. If it is an older expansion tank, it will most likely be mounted in the ceiling of the boiler room, it will be a large steel cylinder, that is piped into the boiler, and should have a drain valve on on side of it. If this is the case, connect a hose to the valve, and allow all the water to drain from it. This should solve the problem if it is your expansion tank. Hope this helps.

Apr 03, 2010 | Water Heaters

1 Answer

Lots of water on basement floor at pressure tank.


sounds like the bladder tank at the well is ruptured this will cause pressure surge, and pump short cycling, and needs to be replaced asap.

Mar 28, 2010 | Amtrol ST-12-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...

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