Boiler pressure running high

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Old 04-22-16, 02:47 PM
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Boiler pressure running high

I just installed a new EX-30 Amtrol pressure tank on my boiler, with my old tank my pressure always ran at 12lbs. After installing the new one I bring the pressure down to 12lbs but it seems to goes back up and wants to peak at 20lbs. Should I let some air pressure out of the pressure tank? Thanks....
 
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Old 04-22-16, 03:21 PM
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The tank should have come precharged with 12 psi... It should have been checked before install.. Sometimes those tanks sit on shelf's for a while.. Probably dont have enough air in it as they lose about 2 psi a year...
 
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Old 04-22-16, 04:15 PM
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I thought they came precharged, never did think about checking it first. More air in the tank means less pressure and less air in the tank means more pressure on the gauge? Now that the bladder is full is there anyway to check and adjust so I can bring my pressure down on my gauge?
 
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Old 04-22-16, 06:10 PM
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In order to check the tank now you'll need to reduce the system pressure by emptying out water.

If there is not enough air in the tank.... when the system heats up the water needs to expand somewhere..... if not the expansion tank.... then into the system.
 
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Old 04-22-16, 09:38 PM
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I'll take the tank back off and check it. I know the tank has air in it, just don't know if it had 12lbs empty when I installed it. I just checked it with the bladder full on the boiler and it read 20lbs, I reduced the air in the tank to 12lbs but the the pressure in the system went up to about 25lbs. Guess I'll have to remove and drain the tank in order to get a correct reading.
 
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Old 04-23-16, 04:32 AM
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I just checked it with the bladder full on the boiler and it read 20lbs, I reduced the air in the tank to 12lbs but the the pressure in the system went up to about 25lbs. Guess I'll have to remove and drain the tank in order to get a correct reading.
Yes remove the tank.. or just turn off the water feed and drain some water out of the boiler until the gauge reads 0.. Then test the tank and add 12 psi..

Also your gauge can be off and or your fill valve can be faulty and over filling the boiler...

Filling the boiler cold it should fill to 12 -15 psi..
 
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Old 04-23-16, 05:50 PM
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I drained the boiler down and checked the air in the tank, very low about 5 lbs. Put air in the tank and brought it up to 12lbs, so far so good, showing between 12 and 15lbs on the gauge. I'll keep an eye on it for a few days to makes sure the pressure doesn't go up again. Thanks for all the help, going to post another little problem I have, hope we can figure that one out too, thanks again...
 
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Old 05-14-16, 04:29 PM
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The pressure will go up as the water heats up. 12 cold and 18-20 hot is ok. The less air in the tank the less cushion for the water as it expands and you will see higher hot pressures
 
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Old 05-15-16, 07:05 PM
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If the tank is on the supply side of the boiler and the circulator is on the return side of the boiler it may crepe up a bit until dependent where the fill valve is putting water into the system.
 
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