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Old 06-23-2015, 05:57 PM   #15
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I'm Melting! AC stops after few minutes?

If you got the thermostat wires wrong the fan motor can overheat and the thermal protection sensor will cut the fan.

I know because I did this on my Armstrong.

I found a schematic on the internet somewhere to get them right.

I have run my a/c on 15 and 20 amp circuits for perhaps hundreds of days without issue. However, experience may vary....
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Old 06-23-2015, 10:19 PM   #16
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Quote:
Originally Posted by J. Morgan View Post
If you got the thermostat wires wrong the fan motor can overheat and the thermal protection sensor will cut the fan.

I know because I did this on my Armstrong.

I found a schematic on the internet somewhere to get them right.

I have run my a/c on 15 and 20 amp circuits for perhaps hundreds of days without issue. However, experience may vary....

This is currently happening to my Armstrong unit can you share with me the correct wiring for the thermostat.
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Old 06-23-2015, 10:40 PM   #17
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I cant exactly remember.

The wires on the unit and on the thermostat are labeled with letters, RC, W, Y, etc...

I did a little internet research and it ended up that I had a wire in the wrong spot.

If memory serves, the connections on the unit itself were not what I expected, and I switched a wire in the thermostat and everything worked well after that.

I wish I could remember more to help you better.
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Old 06-23-2015, 10:52 PM   #18
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On reflection I think it had to do with the fan high/low setting.

I think I was trying to switch the fan through the two stage setting on a modern thermostat and it did not work.

I ended up running the high/low control through a two way light switch, bypassing the thermostat control.
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Old 06-24-2015, 06:34 AM   #19
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Thank you J. Morgan after doing more research I figured out that for low speed only the low speed wire is used for high speed BOTH high speed and low speed wires need to be connected to the fan terminal on the thermostat. I had it wired through a toggle so it was either high or low that would connect to the thermostat. So when the fan was set to high only the high wire was energized. The fan would run for a while then overheat and shut down.
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