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How do you adjust a gas valve on a boiler? - Heating & Cooling

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Turn it??! some information would be nice when you post a question

Posted on Jul 30, 2008

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Mcdonnell Miller automatic feed valve does not seem to supply enough water for steam boiler. Is there an adjustment?


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Pilot light won't light


Will it initially light, then go out when you release the button?
If yes, then change/adjust the thermocouple or pilot size.
If no, then check that you have a gas supply, that the igniter is sparking, that the gas valve is allowing the pilot flow through.

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Flame Pulsing


A pulsing flame is a gas pressure problem. It shutting down is probably because the boiler thinks there is no flame when it goes low on the pulse and shuts the gas valve off. Listen to your pressure regulator and gas valve. If either is causing your problem, you will hear it. If so, smell the end of the vent line from it. If your diaphragm is leaking, you will smell it. I have specific questions but will throw a few general things out here for you. If you don't have a regulator outside of the gas valve, it is inside the gas valve. Try turning the supply pressure up or down a little. Remember where the screw is so you can put it back. Both under and over firing a furnace both have their own bad consequences, so don't adjust it too much either way. If it reacts to adjustment but still pulses, it is probably bad. Check the vent line for a gas smell. And of course, check all the electrical connections. Watch the pilot assembly when it shuts down to confirm why it is shutting down. Are you using natural gas from a city supply or propane? I'll check back here later to see if your still here. Hope it is already fixed though. Roger

Mar 16, 2014 | Heating & Cooling

1 Answer

Baxi boiler


Make sure the gas inlet & outlet pressures are correct (manometer) & that the primary air mixture is adjusted correctly. Check to make sure you have 1 square inch of outside air for combustion per 2000 BTU's rating on the boiler.

Nov 24, 2013 | Heating & Cooling

1 Answer

Hot water boiler will not ignite


Check all your limit switches on this unit. One of them is either tripped or bad.

Apr 07, 2009 | Water Heaters

1 Answer

Boiler won't start


near one corner of the gas valve is a slottedplug.
It looks like large screw headremove the plug just like any screw. This lets you access the gas pressure adjustment screw.
Usually no more than one half to one full turn is needed. (clockwise to increase pressure)

It is important that you not have to much Gas pressure as this will cause overheating and premature heat exchanger failure.

The best thing to do is check the pressure going into the gas valve, and also coming out. Make sure the inlet side of the GV is not partially clogged where the pipe comes in. (especially if you have copper pipe with natural gas)

Jan 10, 2009 | Heating & Cooling

1 Answer

Pressure upto max nearly im my bolier


You don't say what kind of boiler this is but I'm going to guess that it is a hot water boiler.  If so, you have a combination valve which adjusts the water by pressure and bleeds off excess.  These valves do get corroded and dirty.  Shut down the boiler, shut off the feed water valve.  Replace the valve assembly.  Do not try to adjust these things.  Your new valve should maintain about 15 psi.

Dec 19, 2008 | Heating & Cooling

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