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I have an old SlantFin gas water furnace which uses subject valve with a standard pilot light and powerpile setup. The electric scheme is very simple, as it's a very old model.
Last spring, the powerpile went and I replaced it with a unit that I bought from a local plumber for $45. The valve is supposed to operate on 750mv from the powerpile, however the powerpile that I bought produces 550mv or something around that. I asked the plumber 2-3 times and he assured me that it's the right powerpile and that he would use it too if he was doing the repair himself. I installed it and the system worked fine. (On second thought, it may have been that the powerpile had produced around 550mv when I tested it before it died and the new one was 750mv and I was worried that the voltage is too high, don't remember exactly now)
Today, my tenant tried turning the heat on and sure enough, it doesn't work. Upon cursory inspection I found that: the powerpile works, the pilot light is on, the water pump works, the electrics are fine. The only thing that doesn't happen is the main gas doesn't come on, which obviously points to the valve. Note that it worked only 6-7 months ago with the same powerpile.
- Is the voltage difference acceptable?
-- If yes, is it possible that the lower voltage that the new powerpile produces somehow damaged the valve over the period of recent months? I seem to recall that when insufficient voltage is supplied to a magnetic coil, it may spoil the static magnet inside the valve assembly (assuming that's how it operates).
--- If this is the case, is the valve dead or there's hope for it, if I find a powerpile with the right voltage?
-- If not, is it more likely that the valve died on it's own, due to it's age?
- In any case, if I do need to replace the valve, is this the correct item? http://keithspecialty.com/k/67-745.htm
- Is this the correct powerpile? http://www.pexsupply.com/Honeywell-Q313A1139-Thermopile-Generator-1743000-p?gclid=COLh68OI97kCFQ6k4AodklwAtA