gas valve / ignition module

majordw

hello friends, while trouble shooting my boiler with a honeywell vlv and ign. mod idecided to apply 24 volts directly to com /pv terms from a external trans plugged into the wall . idid this with gas on and pilot line disconnected, i held power to it for only afew seconds and smelled no gas from the pilot port. failed vlv right ?

Doc Holliday

You'd need a manometer to test gas inlet and outlet pressure of valve. Do you have gas to the valve? Did you hear any clicking once you applied voltage to the valve? Are you absolutely certain you had voltage to the valve?

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Thanks.

majordw

yes to the voltage, no click, at one point i had the union apart and cracked the gas cock and definitly have gas, have no manometer. thanks

Doc Holliday

Well, I've yet to come across a working gas valve that doesn't click when voltage is applied. It's a simple coil on the inside with contacts. The contacts are what you would here "clicking".

Can you test continuity (ohms) from one low voltage spade to the other across the valve? I'd be willing to bet you'd have none as the internal coil is bad so yes, change the valve.

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Thanks.

ben's plumbing

if you have voltage to valve and its not opening....bad valve....or did i miss something...

majordw

thanks it must be an intermitant failure new vlv on the way. new problem press relief vlv going off, dom system press goes to 125 when firing. bladder in expansion tank verified good its press 30 psi air side with water drained. street press is 80. raising precharge should fix right.

how

I'm confused by your reported 125 on a domestic boiler sytem? PSI? temp? What kind of boiler system do you have. Do you have a boiler/ HWT combination? Pressure relief usually opens at 30PSI.
Is your pump circulating hot water..feel the inlet & outlet pipes for temp.

beenthere

Are you working on a boiler, or a water heater?

majordw

sorry guys, i have 2 domestic gas water heaters manifolded together with 2 storage tankswith circ pumps that are working. system pressure is at 80psi until the heaters fire thats when i jump to 125 psi this system has been working fine until recently. not sure if that 80 psi has recently been raised. my precharge was at 30 psi i raised to 40.still popping off. when system reaches 125 , i get 80psi at my expansion tank schrader vlv. im afraid to raise precharge any higher. relief vlvs opening at 125 as they should. thank you

techpappy

Re check your cushion tank. Isolate from system and drain completely. Apply air via the schraeder valve with the waterside of the tank open. See if air escaping through the bladder. I'm guessing the bladder has a hole or tear in it. Otherwise the pressure wouldn't be rising as described. You can not compress water so, when the tank and air bladder is flooded there is NO cushion. Relief valves are only rated to within 10% therefore do not operate over 100 psi. You may have to install a test valve or tee to isolate the tank to carry out this procedure. good luck
TechPappy 40 years in the boiler biz

beenthere

Air charge should be the same as your water pressure. Remove tank and bring it up to 80 PSIG.