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  1. #1

    Question I need a Mercury Shut off Safety Switch

    My Napoleon gas fireplace needs a Mercury Shut off Safety Switch. This fireplace is almost 18years old and I was told I need a whole new insert for about $$$$ The fireplace size is 37" by 33". Where can I get the safety switch and are there any alternatives so that I don't have to buy the new insert. I was told that the company doesn't make these switches any more. Thanks for any help you can give me.
    Jeanette
    Last edited by jpsmith1cm; 09-01-2012 at 10:25 PM. Reason: Pricing

  2. #2
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,588
    I don't know much about the old fireplaces but sounds like its the mercury flame sensor. I know some fireplaces are real tough to find parts for. You may try a google search but like I said some of them can be a pain to get parts. You would need model and serial number also.

  3. #3
    Thanks for this. I appreciate your help very much.
    Jeanette

  4. #4
    Thanks for this info. Much appreciated.
    Jeanette

  5. #5
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,400
    Removed pricing. Not permitted per site rules.

    Also, moved thread to Fireplaces forum.


    One of the gurus should be along shortly to help you out.

  6. #6
    Join Date
    Sep 2003
    Posts
    1,665
    or a part number off of flame sensor usually where if it is a plug in on the head

  7. #7
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,588
    There may be a gas valve upgrade also, that would get rid of the merc sensor, you can do it with a gas furnace.

  8. #8
    Join Date
    Aug 2004
    Location
    S.E. Pa
    Posts
    6,141
    You can contact your local Napoleon dealer but they will be very limited in helping you in this matter I'm sure. These switches are no longer used and existing stocks have been depleted. There may be the occasional stray one on Ebay perhaps but that's about it. As above, get the model, serial # and hopefully part # of the original. A few mfrs. do offer a conversion kit to a thermocouple flame proving system, which will generally require a whole new valve and pilot assy. Don't cut corners and cobble together something that 'works'.
    HTH

  9. #9
    Join Date
    Nov 2009
    Location
    Simcoe, ON Canada
    Posts
    43

    Napoleon and Hunter and CFM

    Other than for testing you should never bypass part of the safety system. The mercury vapour was was designed to shut gas off quickly in the event of a pilot failure. Napoleon in Canada has some valve and pilot assembly changeouts for some of their models. Hunter and CFM can also be changed out with a vavle and pilot assembly. If you want to contact me with your model numbers I can tell you if parts can be found.

  10. #10
    You say "shut gas off quickly in the event of a pilot failure" .. do you mean gas to the main burner or gas to the pilot? If it is gas to the main burner, what I don't understand is that if the main burner is burning, how is it even possible for the pilot to go out?

    If its the pilot, then why does the gas to my pilot not shut off now with a broken mercury vapor switch?

    My fireplace is a Hunter HDV30-e-3

    In my manual, it lists the part as this:
    part number: 916243
    description: Mercury Vapor Switch

    I also find it very curious that there is no replacement part for this that contains no mercury... seems like a pretty simple mechanism to me, but I'm no expert.

    Thanks!

  11. #11
    Join Date
    Jan 2009
    Location
    Kingston,Ontario
    Posts
    50
    Quote Originally Posted by Joehvac25 View Post
    There may be a gas valve upgrade also, that would get rid of the merc sensor, you can do it with a gas furnace.
    Right here. New valve. I work for a Napoleon dealer, they have none. Or so they say so someone will buy a new fireplace rather then replace valve.

  12. #12
    Join Date
    Dec 2011
    Location
    PA
    Posts
    199
    Yeah I second Hearthman. Talk to the Napoleon, most likely they offer a conversion kit, or know of someone who makes one. that will be your cheapest option(other than finding a mercury sensor)

  13. #13
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,588
    I have a few mercs in my van but their all different and most likely not the same. We get rid of them when possible.


    Sent from my iPhone using Tapatalk

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