Question about Honeywell Heating & Cooling

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Have a Homart gas fired furnace with a Mueler Climatrol thermopile and an old mercury bulb temperature sensor on the top of the furnace in the duct work going straight up to a floor grate with a filter. There is a 2 conductor #18 solid copper thermostat wire going from the temperature sensor, on the top of the furnace, (1) to a terminal and the 2nd spliced through to a conductor going to the thermopile and going to a General Control T-80A thermostat which states for use with millivolts circuit only. Gas furnace works with this thermostat but with a Honeywell T 87K1007 heat only thermostat the gas valve doesn't open for full burner activation when calling for heat. What is the problem? The Honeywell thermostat is only acting as a single pole switch. My cell phone number is **************.

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  • Henry Samek Oct 30, 2019

    This is Henry Samek. I did some research and found a Honeywell thermostat model# CT 53K that accepts 250 to 750 millivolts and ordered it. There is no fan on this system. The 600 millivolts answer is likely correct but you need a thermostat that is compatible and the Honewell model# T87K1007 is not millivolts compatible. Since there is no transformer and only a thermopile that produces millivolts, then the Honeywell model# CT 53 thermostat 2 wire hopefully will be the answer for this Homart gas furnace with a Mueler Climatrol system. I will let you know. Thank you for your help!

  • Henry Samek Nov 01, 2019

    This is Henry again. I installed the Honeywell CT 53K thermostat for the Homart gas fired furnace with a Mueler Climatrol thermopile and it works beautifully on millivolts produced by the thermopile. So, if you ever need to need a compatible thermostat for millivolts produced by a thermopile the Honeywell CT 53K with a range from 250 to 750 millivolts is the one to use!

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  • Honeywell Master
  • 3,484 Answers

Check the voltage coming off the thermopile it should be 600mille volts .

Posted on Oct 29, 2019

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6 Suggested Answers

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Posted on Jan 02, 2017

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Anonymous

  • 288 Answers

SOURCE: cozy one sided wall furnace (no blower motor)

This is a weird one, but make sure all the wire connections are in the correct place. I accidentally miss wired a heater like this and it did the same thing.

Posted on Dec 18, 2007

Anonymous

  • 34 Answers

SOURCE: New honeywell thermostat on new gas furnace not working

sometimes there's a differential setting anywhere from 1-3 degrees, see if you can make sure it's down to 1

Posted on Nov 12, 2008

dmftrucker

daniel hendrickson

  • 1922 Answers

SOURCE: I have model#2509622 Williams wall

can you manually fire the unit w/o the thermostat by shorting 2 of the 3 wires, there may be more wires than that, but you should be able to fire it on 2 to 3 wires alone let me know it sounds like something is floating voltage wise on the unit

Posted on Oct 09, 2009

Anonymous

  • 108 Answers

SOURCE: Replaced mercury thermostat w/Honeywell CT87K - doesn't work!

You need a specific thermostat for a Wall Furnace it is a Millivolt Thermostat and not a 24v standard thermostat....usually it will work anyway however if the powerpile (generator produces millivolts from the pilot light) is weak it may not be producing enough...or the Pilot light may be dirty and lazy...won't produce enough millivolts ...or you can have bad or dirty contacts or connections....or a combination of any of the above.....a 24v Thermostat and particularly a non-mercury thermostat has too much resistance in it for a millivolt system....as your Wall Furnace (other than the fan) runs on less than 1 volt

Posted on Oct 31, 2009

muttandjeff

Allen Neal

  • 359 Answers

SOURCE: Honeywell dial theromostat.

you need to check the furnace itself for , locate the 24 volt ac transformer inside the unit and see if it is fused some are some not , check to see if you have 120 volt ac in from the source and 24 volt ac out , sounds to me as if you have lost the 24 volts ac which powers the thermostat as well as the furnace pay close attention as to how you remove the wires and make a diagram and you should be able to replace it yourself , once you get it uot goto a heating supply place in your area and let them match it up and this should be a fix ya

Posted on Dec 31, 2009

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