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JBarca's avatar
JBarca
Nomad II
Feb 27, 2021

Atwood 8500 series furnace bench test on high limit switch

Furnace: Atwood Hydroflame 8520-IV DC Installed in late 2003. I am doing a total restore on a wet 16 year old camper. I am at the point of servicing the furnace and have a question concerning tes...
Boundless2281's avatar
Boundless2281
Explorer
Feb 26, 2023
Hello,
I know this is an old post, but I have the exact same furnace and need to bench test it. I am unsure what to do with the blue thermostat wires. I applied 12V to the positive and negative wires, but I am not sure what to do with the 2 thermostat wires. Do I need to connect them together? Or do they get supplied with 12V? They are both blue, does the polarity matter if I am supposed to be connecting them to 12V??

Thank you.

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