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  1. #1
    Join Date
    Oct 2012
    Location
    Sandy, Utah
    Posts
    93

    Thermopile Question ???

    I realize every manufacturer has their own spec's but with that said here are some of my questions:

    How long of T-stat wire is too long of a run when using a thermopile?

    What's the best size of wire and type of wire to use for the stat wire?

    Would it hurt my gas valve if I replaced my thermopile with a larger millivolt one?

    I've had my fireplace for 15 years now and it's pretty much been inconsistent when it comes to the flame signal producing enough "umph" to kick on the main gas. That's why the questions. Occasionally I'll clean up the thermopile hoping that might help. I've even thought of just putting a switch in parallel with the t-stat so I could override the t-stat. I can't remember the millivolt signal I'm getting. Should have measured it again before I posted this... sorry.

    Any tips for me, the guy who bought a fireplace and wishes he had paid enough more to get a nicer one?

    Thanks!

  2. #2
    Join Date
    Oct 2004
    Location
    Central WA
    Posts
    1,490
    Make sure all of your connections are tight. Check your milivolts - needs to be over 400 unloaded. Check the resistance across your thermostat -- bad contacts or a heat anticipator can cause problems when you are dealing with less than half a volt.

    Maybe it's time for a nice remote?

  3. #3
    Join Date
    Oct 2012
    Location
    Sandy, Utah
    Posts
    93
    thanks cjp I'll check that out.

  4. #4
    Join Date
    Jan 2005
    Posts
    447
    FYI, thermopiles very seldom fail, looks for excessive millivolt losses in the circuit as cjpwalker has stated.

  5. #5
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,588
    It has to be a larger than 18-2 wire, read the manual but it will work on small wire for awhile but eventually have issues. I had one that had same issue, pulled new wire and worked great!


    Sent from my iPhone using Tapatalk

  6. #6
    Join Date
    Nov 2009
    Location
    Simcoe, ON Canada
    Posts
    43
    Most manuals that I have read have a chart. something like this.
    up to 40 feet 18-2
    up to 80 feet 16-2
    up to 100 feet 14-2

  7. #7
    Join Date
    Nov 2012
    Posts
    9
    Your thermopile should put out 400 to 750 mv. Most fireplace circuits have an on off switch on them. The first thing I would check is the quality of the pilot flame, the pilot could be weak.

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