Question about Cozy Enclosed Front Console Heater 70,000 btuh Natural Gas

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Fan switch will not make (limit switch).

On 1-25-08 my partner and I installed a brand new fan type wall furnacein very old apartment building. After we got the old furnace out and new furnace in place we realized that to make the new furnace fit properly the bottomplate of the furnace would have to be removed. I know that thisis not the thing to do but because of existing vent, and no room forplay, we felt that we had no other option. I personally thinkthat this could be part if not all of our problem. I'm thinkingwith this plate missing furnace plenum is not able to gererated enoughheat to activate my limit swithch to power my fan. When T-Statcalls for heat burner flame ignites as it should, but no fan. Ilet furnace cycle 3-4 times to really let some heat generate inside ofplenum to see if limit switch would make nothing. After a whilethe vent switch on the furnace which is NC will open on temp. rise asit should to kick out gas to burner. Jumped out swithch fan runsfine. Removed switch aswell to test switch for proper operation,switch is closing on temp. rise, and opening on temp fall as it isdesigned to do. Even though my limit switch test ok, could itstill be faulty. Had another technician that I work with to bringme another limit switch just in case it was bad. Long story shorthe brought me a NC switch by accident, being that it was getting late Iinstalled the NC switch to give customer continuous fan operationthrought the weekend, so they would have heat. I have ordered anew fan switch, but still not certain to what is causing fanswitch/limit control not to close and complete circuit to fan. Ifnew switch does not resolve problem, is it possible to use anotherlimit switch that closes @ lower temp. Existing switch is rated @120F-25F. Thanks for any assistance you can give me.

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  • jhuggins9 Jan 27, 2008

    My heater is not the heater listed above it is a Cozy Furnace Model
    number CF653C-H, fan type vented wall furnace. This furnace type was
    not an option in the list and without entering a certain heater I could
    not complete my post.

  • jhuggins9 Jan 28, 2008

    So what you are telling me is that I will need to sign up for your premium assistance plan before anyone will respond to my problem?

  • jhuggins9 Feb 03, 2008

    Your suggestion was a great help to me. We ended up to to install an adjustable fan swithch which I set to close @ 110 degress, and open @ 90 degress, 20 degree differential. The metal sheild definitely horned in the heat to assist in making the switch. Factory swith would probally work aswell with your idea, but we just more comfortable with the adjustable swithch.





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If the snap switch is not located close enough to the plenum, this can be problem. The other option would be to cover the switch area with a metal shield or liatherm paper (fire rtardant paper).

Posted on Jan 29, 2008


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Mistake #1, calling the plumber/installer to diagnose a heating problem; unless of course he was dually licensed as a plumber and a HVACR technician. (Heating, Ventilation, Air-Conditioner, Refrigeration)
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