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Old 03-08-2012, 09:47 PM   #11
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Got the switch installed and it works like a charm. There are only 2 screws holding the furnace in place. Disconnected the propane line, had to remove the outside vent cover and an exhaust tube with a flange that fits very snuggly to the furnace and removed the entire furnace. Tapped into the red wire to the fan and re-installed the unit. While I had it out, used aluminum tape and covered the 4 unused duct covers that leaked air like crazy. Now, when we go to FL in Dec and experience cooler nights, we can just use the furnace blower to circulate the heat from our electric heater down into the storage area and thru' out the trailer.
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Old 03-14-2012, 07:00 PM   #12
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I have seen this topic under discussion on a forum somewhere. One of the concerns was that the fan is a dual blower setup on one motor, one for indoor air, and one for the combustion chamber. If you turn on the indoor fan, the outdoor fan runs also, pulling cold air thru the combustion chamber. Assuming you are running the fan with a temperature difference between inside and outside, and there is humidity in the air, the concern was condensation accumulation on the combustion chamber walls that could lead to early failure. During normal operation the chamber is hot so this does not happen. I'm not sure if this was all theory or someone got this from a manufacturer. I'm not saying this will happen, I'm just referencing the post I read and their thoughts. I do find it interesting that most rv's have an air circulation fan switch on the A.C, but I have never seen one on a furnace. I wonder if this is why?
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Old 03-14-2012, 07:23 PM   #13
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Furnace Fan Switch

The motor is a dual shaft with the combustion blower on one end and the hot air on the other. I don't see it being much of a problem with condensation as it will just blow in the combustion chamber and out the exhaust port. The fresh air inlet is open all the time anyway and if the wind is blowing, you would get a similar altho much less effect. I am willing to take the chance to get the warm air into the storage and underbelly without using propane.
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Old 03-14-2012, 09:10 PM   #14
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It could be done, but you would have to add a fan relay, The question is were you would find a 12v fan relay. If the unit was 24v like a house furnace you wouldn't have a problem. I do not know of a 12v relay. If you find one let me know and I would be able to draw you schematic. You might check some web sites. but you still might have to buy a different stat.
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Old 03-14-2012, 09:39 PM   #15
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Furnace Fan Switch

I have already got the switch installed and it works fine, it is not controlled by the thermostat, it is a manual switch. It bypasses all the furnace controls and works by just powering the fan itself from a separate 12v source. Also tried it by turning the manual switch off and turning the furnace on for heat. Everything still works as before.

But thank you very much for the offer of assistance, I appreciate it very much.
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