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Old 05-19-2022, 05:07 PM   #1
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Possible to check furnace when ambient temp 100F?

Last time we went out I had an issue with the sail switch. I'm the least handy person in the world but youtube and some determination got me to the finish line.

Fast forward to today. I'll be dry camping in elevation next week and the temps will drop at night. I'd like a way to test the furnace now but cant get it to start; likely because the thermostat is reading 100F (I live in Las Vegas).

Is there any way to test this before I head out?
Thanks!
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Old 05-19-2022, 05:23 PM   #2
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I think you can just remove the thermostat and connect the two wires that go to the thermostat. But, I don't know your thermostat.
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Old 05-20-2022, 09:41 AM   #3
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Quote:
Originally Posted by gbaglo View Post
I think you can just remove the thermostat and connect the two wires that go to the thermostat. But, I don't know your thermostat.
That depends on whether you have the furnace only thermostat, in which case it will work, or the combined AC/furnace thermostat, in which case it won't. The combined thermostat contains a bunch of electronics that sends a signal to another box of electronics in the air conditioner that then fires the furnace. There are 3 wires in the combined thermostat +12V, -12V (common) and control.
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Old 05-20-2022, 11:59 AM   #4
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The temps finally dropped some early this AM and I was able to turn on the furnace. And it works!
Thanks for the input.
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Old 05-20-2022, 05:21 PM   #5
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Back in my packing house days we worked in a refrigerated room that was 42 degrees F. The ladies boning loins on the line would get cold . So to shut the chillers off, we would put a few cubes of dry ice in a plastic bag and set the bag on the stainless steel box with a lock on it, that covered the thermostats. The chillers would shut off and it would start to warm up. When discovered, the federal meat inspector would slap the ice bag off the box and into the floor and go looking for the foreman. So in your case, a few ice cubes in a washcloth, and putting them on the thermostat, would do the trick.

My wife taught in an old elementary school and had a classroom on the NW corner of the school. She would wrap the thermostat in a wet paper towel, put a little fan on it and the thermostat would cool down, opening the valve for hot water to push through the radiators, This was a Herman Miller system. I had one in a school converted to a recreation center too.

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