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Boiler service guys only!!?

Question : Boiler service guys only!!?
Tapping/rapping noise driving us crazy!! I have an oil boiler, that heats our 1-zoned apartment, and also provides our hot water. Here is the problem: Everytime the heat is on (ciculator on), the flow check vavle is rapping and tapping the whole time. This noise travels throught he pipes and makes a hell of a racket. I know how to bleed the system, and I’m pretty positive its not air in the system. The only way I found to stop it is to bleed out water from the system, and lower the operating pressure inside the unit. As it builds back the pressure in 2-3 days, the tapping comes back. So basically, instead of operating just under 30 lbs of pressure, I bring it down to like 20 lbs. I pretty positive its the flow check, as I’ve spend hours in the basement using a piece of wood to my ear to listen to different parts of the unit. If its not the flow check, it is possibly another “flow” valve that is just above the expansion tank.
This is NOT your normal pipes tapping from air in the lines, like the baseboard pipes tapping. This is coming from inside a flow valve. I don’t want to go throught he hastle of replacing the valve, only to have this happen with a new valve. In other words, can this problem be due to something else wrong, such as a bad expansion tank or bad auto air vents near the boiler? I have baseboard heat, not radiators, and there are no bleeders anywhere in the apartment. The boiler is old, but works great otherwise. Any help much appreciated!
boiler service

Best answer:

Answer by lordshaiths
sounds like your fill valve is sticking allowing your pressure to build up. another thing is the expansion tank could be water logged or low on air pressure. there is normally a flowsetter valve in that type of system to prevent water migration during domestic heating, i have seen them go bad and make a racket when they fail…best answer call a service tech to go over the system

This entry was posted by admin on September 7, 2010 at 11:48 pm, and is filed under Heating and Cooling. Follow any responses to this post through RSS 2.0.You can leave a response or trackback from your own site.

Comments (3)
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#1 written by panther 1 year ago

air lock

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#2 written by craig r 1 year ago

This may sound kind of technical because it is but here goes. Turn of the boiler.Turn the water of to the make up water valve.The make up water valve will overfill the system if the “expansion tank” or “extrol tank”, which ever you have are not functioning properly.
If you have an expansion tank you should isolate the tank at the valve between the boiler and the expansion tank. then there should be another valve on the tank to drain it. the tank is going to create a vacuum so you may need to find an airtrol fitting to loosen to break the vacuum in the tank for this to happen.once drained set the valves to the tank back to there original positions,most important the tank has to be open to the boiler, this is where the air is compressed during thermal expansion.
If you have an extrol tank, this uses a bladder which is charged with air, usually 12psi which can be checked and charged Thur a fitting on the tank just like the valve stem on a tire. the water pressure should be off of the tank when you check or charge it.
once you have serviced the tank, which ever you have you need to turn the water on to the pressure regulating valve and and if it has been adjusted before now,set it to 12psi give or take 10%.
I hope this helps,if its too involved or does not seem to work for you please call a qualified service technition.

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#3 written by Hairpuller 1 year ago

What you hear is probably “Hammering” caused by cold water mixing with (or entering) hot water stream. If your system is a single loop, then check the bypass line NRV for passing (scaling prevents the NRV from closing properly). Otherwise, check the same in the primary loop.

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