I re-installed my furnace with it's new motor finally. I don't seem to have any power to it now. My recollection is the motor should start up as soon as the thermostat calls for heat. Hooking the motor up direct to a separate battery works, so its not a bad motor. I have no schematic so my question for now, where does the main power supply come from? I assume it feeds into the reset switch, but I'm getting nothing there. (This is a single furnace setup, atwood 40,000 btu.)
Gayland,
Go to Heating Systems - Atwood Mobile (http://www.atwoodmobile.com/heating-systems.asp)
Click on and download the manual for your furnace.
Brett
Gayland,
I haven't looked at schematics recently, but my furnace (Atwood 40,000 btu) has a significant delay in starting, after the thermostat is set to call for heat. The delay is about 30 seconds. I always assumed that the delay was to allow for the "shopping" (at the thermostat) to die down before the furnace fan and then the ignition sequence is called into duty. The "Fan Only" and AC's have a shorter (about 5 sec.) delay. As I recall, 12Vdc is always available at a motor mounted relay, and the thermostat simply energizes the relay (or forward biases a transistor) to enable power to the motor. There is a motor mounted "ON/OFF" switch, on the upper left side of the motor, for that 12Vdc power to the relay that is sometimes balky. Corrosion X generally makes it reliable again.
FWIW
Neal
Okay, that all helps, I was able to jumper from the hot wire of the fridge to the furnace and the motor ran as it should, thus confirming my belief that its a power-in problem. (Can't confirm heat, I'm out of gas.) I have all kinds of schematics, but none for the house side 12 volt system. Where does that power come from in the first place? Is it fused? Are there safety systems connected to the power-in that could have it shut down?
There should be a 15 amp fuse in the panel mounted to the bed base. I don't know of any other possible power interupter besides the entry door master switch. There is also the individual circuit breaker inside the furnace - verify it didn't pop without you noticing.
In the fuse panel at the end of the bed there are fuses and on mine the fuse has been replaced with a re-settable fuse/circuit breaker.
Push in on the button and it should re-set.
Regards,
Three times is a charm, I guess. I'd already looked for that panel twice. The trick is to close the other breaker box so it's not hid behind it and lift the skirt up higher cause it's right at the top of the bed frame. Thanks, that solved the problem, fuse was blown. Now to get some propane and see if it actually heats :o