New Thermostat Question
I have this furnace in my TC. There are only two connections to the thermostat, and they are labeled “Thermo” and “+Thermo” I’m installing a new thermostat, and it’s connected like ...
Forum Discussion
I just replaced the circuit board in my Atwood furnace and Doug is correct...where the T-stat wires connect to the board, closing that circuit starts the ignition sequence. However, on my board there were 2 separate terminals for fan and 12v+. As part of my troubleshooting, I could apply 12v directly to the fan terminal and get the fan to run.
So you could in theory run a separate wire to the fan terminal on the board that you could control by a switch. Even if you couldn't get the wire back to the T-stat, you could a mini slide switch or similar close by the furnace.
The fan would then get 12v either from the thermostat powering the board to start the ignition sequence, or directly from your bypass circuit that only powers the fan.
One of the reasons for the factory set up is that the a/c fan runs on 120v, so when you have shore power you can leave the fan on as long as you want, no issues. The furnace fan runs on 12v and consumes a lot of wattage. Overriding the furnace fan in the "on" position when boondocking will kill your batteries in very short order....
So you could in theory run a separate wire to the fan terminal on the board that you could control by a switch. Even if you couldn't get the wire back to the T-stat, you could a mini slide switch or similar close by the furnace.
The fan would then get 12v either from the thermostat powering the board to start the ignition sequence, or directly from your bypass circuit that only powers the fan.
One of the reasons for the factory set up is that the a/c fan runs on 120v, so when you have shore power you can leave the fan on as long as you want, no issues. The furnace fan runs on 12v and consumes a lot of wattage. Overriding the furnace fan in the "on" position when boondocking will kill your batteries in very short order....
