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Old 12-30-2007, 07:47 AM
F&J F&J is offline
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LP garage heater; need help from an 110v fan motor guru..

We moved into our "new" place on the 22nd. I'm trying to get the biggest shop useable. There is an old Reznor LP heater, dated 1940. I have it starting & heating fine, but the blower fan motor fried.

This 75,000 btu heater has a 2 prong 110v plug....never had a ground lug. The fan type has me stumped because it has 3 wires. When designed, the fan comes on when temps get up. But there is also a toggle switch marked "summer/winter". Summer position just made the fan work for cooling. On Winter position, it only would come on if the temp sensor gets hot enough.

My question is: the orig fan has 3 wires going right into the field windings. (I took it apart to make sure). I wonder if the 3 wires are for 2 seperate parts of the windings, to make 2 different speeds for the "summer" or "winter" modes???

I can try to take a pic of the wiring diagram to show how the switches, temp sensor, and everything else. How could I just use a 2 wire modern window fan motor work with the switch in the "winter" position?...so it could come on with the temp sensor?? I don't care if the "summer" mode does not work.

Any ideas? I am going to use a box fan strapped to the heater for the next few days, just to keep working in the shop. But would like to have it temp controlled in the near future. Thanks
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