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  1. #1
    Join Date
    Jun 2012
    Location
    East tx
    Posts
    164

    Williams Wall Heater questions

    i have a williams wall furnace that a customer is wanting to get going again, hasn't ran in probably over ten years.
    the model # 35GV-5 s# A47820
    Does not look like it has a blower assembly, the only wall heaters i've dealt with in the past have had blowers that come on to heat the space. it has a mv generator gas valve. pilot will come on and stay lit, turn knob to on position. the wires go under the slab to a remote t stat i would imagine but that's long gone. jumpered the two terminals that would be made if the t stat was calling but main burner never would come on. so i'm assuming that either my pilot generator is bad or the gas valve is bad or a combination of both since it's been inactive for so long. i didn't measure mv will tomorrow. just curious what that reading should be. and also if this model is designed to not work with a blower. thanks in advance.

  2. #2
    Join Date
    Jul 2010
    Location
    wisconsin
    Posts
    270
    Are there any limits that could be failed on this furnace. Usually if a pilot generator is bad your pilot wont stay on at all as you release the pilot button

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,311
    Could have a limit switch that is open. Check MV under load, should be at least 300.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  4. #4
    Join Date
    Jun 2012
    Location
    East tx
    Posts
    164
    300. Cool. That's what i was looking for.

  5. #5
    Join Date
    Jul 2007
    Location
    Virginia
    Posts
    5,698
    Check your email, I sent you some info.

  6. #6
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,589
    Edit il msg you, don't realize it was open

  7. #7
    Join Date
    Sep 2003
    Posts
    1,675
    One thing to also look for is a spider web in the burner orifice
    especially if you have the proper mv's and you think the valve is opening but no burner ignition.

    The spiders crawl into the orifice and spin a web . Spiders love these heaters

    So just taking out the orifice isn't good enough sometimes you have to fish a wire thru the
    pipe.

  8. #8
    Join Date
    Feb 2004
    Posts
    2,462
    Hasn't run in 10 years, heck yes there is a spider in there

  9. #9
    Join Date
    Jun 2012
    Location
    East tx
    Posts
    164
    Went back to check, low mv signal, told customer price and they said nopie, which i was glad to hear. They ended up covering the hole and mounting heater on the wall in front of it

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