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  1. #1
    Join Date
    Apr 2003
    Location
    Iowa
    Posts
    763
    Ok tell me if this is bad idea or what I'm missin here.
    Coleman trailer house furnace with 2 wire thermostat for heat and cool, switch on furnace for cool and heat.
    Will a normal thermostat work if I jumper W to Y on the thermostat or will it cause damage to thermostat? Anybody ever try that or should I just get a new thermostat from coleman and forget it?

  2. #2
    Join Date
    Oct 2001
    Location
    Waterford Michigan
    Posts
    2,668
    YEEEEEHAWWWWWWWWW!

  3. #3
    Join Date
    Dec 2003
    Location
    Location!, Location!
    Posts
    929
    ?!

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,910
    I 'm not sure anymore, but I think the change over switch in the furnace uses areverse acting relay.

    Get the stat from coleman.
    Contractor locator map

    How-to-apply-for-Professional

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

  5. #5
    Join Date
    Sep 2002
    Location
    South Dakota
    Posts
    6,579

    It is simply a heating only thermostat. Another heating only thermostat will work fine or just use the R and W terminals on a heating-cooling thermostat.

    When the rocker switch at the furnace is placed in the "Heat" position the thermostat calls for heat as it normally would when R to W closes.

    When the rocker switch is placed in the "Cool" position the air conditioning comes on when R to W on the thermostat opens its circuit and shuts off the cooling when R to W close.

    The purpose was to allow using a two wire thermostat and simple heating only thermostat to keep costs down. In addition, add on AC would not require pulling a new thermostat wire nor a new thermostat.

    Any heating only thermostat will work. No need to jump any wires on a heating-cooling thermostat and don't install the subbase of a heating-cooling stat if you decide to use it.

    In a few cases I have removed the rocker switch and pulled a 4 conductor wire and changed the system over to a conventional heating-cooling thermostat. But that is not necessary.

    Note: This is a Coleman-Evcon system not a Coleman. There is a difference!

  6. #6
    Join Date
    Apr 2003
    Location
    Iowa
    Posts
    763
    okk..... so do I need to change to cooling mode on thermostat if I want the a/c to work ? heat works fine,
    but if I get this right ... what happens if I change to cool then? will that screw it up? just leave on heat? what happens if someone changes to cool? By the way this is going to be a rental house its in. Is this gonna be a problem with the tenants figurin it out?

  7. #7
    Jeez........Just buy a thermostat.

  8. #8
    Join Date
    Sep 2004
    Posts
    3,157
    have you gone to the coleman website? A new stat will only set you back a tank of gas or two

  9. #9
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,084
    Just hook R & W and the furnace will take it from there. No call for heat is a call for cool if the furnace is switched to cooling.

  10. #10
    Join Date
    Apr 2003
    Location
    Iowa
    Posts
    763
    ok thanks fellers

  11. #11
    If you replace the heat only t stat with a heat cool thermostat and you put the t stat in cool on the stat the furnace and out side condenser will not shut off, if you put the stat in heat on the t stat it will operate like it was designed with the two wire t stat. Tailgunner24

  12. #12
    Join Date
    Jun 2007
    Location
    The Twilight Zone
    Posts
    2,964
    Quote Originally Posted by Tailgunner24 View Post
    If you replace the heat only t stat with a heat cool thermostat and you put the t stat in cool on the stat the furnace and out side condenser will not shut off, if you put the stat in heat on the t stat it will operate like it was designed with the two wire t stat. Tailgunner24
    You replied to a post that is over 4 years old - May of 2005.

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