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qtown

Joined on October 9, 2009

Last Post on February 4, 2011

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been shoveling roofs

@ February 4, 2011 10:14 AM in Only Bangs when thermostats satisfied.

Priorities! Expansion tanks read just under 15psi

expansion tank pressure

@ February 2, 2011 8:42 AM in Only Bangs when thermostats satisfied.

I'm afraid I don't understand how to answer that.

HTX60

@ February 2, 2011 8:40 AM in Only Bangs when thermostats satisfied.

Heating contractor added an additional HTX 60 in line with the existing. I am told the boiler pressure on the gauge at 20psi is slightly higher than it should be.
Adding the Expansion tank did nothing to alleviate the problem.

PUMP

@ January 31, 2011 3:28 PM in Only Bangs when thermostats satisfied.

Is on the return. There are ball valves before and after the pump, and they are both wide open

thanks for the input

@ January 31, 2011 1:18 PM in Only Bangs when thermostats satisfied.

No flow control valves, there is a separate hot water heater . Down by the boiler there seems to be more of a vibration on the supply piping than the return. If I could pinpoint the location I'd gladly open the wall.

qtown

@ January 31, 2011 12:02 PM in Only Bangs when thermostats satisfied.

No Zone valves, 1 zone with a 110 circ, on return. Been like this for 20 years with no problem until recently.

Only Bangs when thermostats satisfied.

@ January 31, 2011 8:46 AM in Only Bangs when thermostats satisfied.

I have a 20 year old Burnham Hot water Boiler that's worked perfectly. Converted gravity system, original piping and column radiators, with a Taco110 circulator. I have 2 HTX 60 expansion tanks installed. This is the 3rd straight heating season I've been putting up with this problem. The thermostat calls, pump goes on , house is heated, thermostat is satisfied, pump shuts off. Any where from 3-5 minutes after this sequence I get loud banging from the pipes inside the walls.
It is always the same banging, like someone is banging on them with a hammer. and it is not from the radiators. Boiler temperature usually stays at 140, Boiler pressure at 20psi when circulator is running, slightly less when it's not. Can't bleed any air out of the radiators. And it doesnt' matter if I turn the pump on for just a few minutes and turn it off before the boiler water gets a chance to heat up, so I don't think it's expansion. This problem is driving me crazy. Any ideas anyone?