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Old 09-24-2021, 11:14 AM   #1
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Downsizing Furnace

Hi All,

I have a 1986 Overland 30' class A which just sits on my off-grid property and doesn't move anywhere. I will be living in it temporarily while I build a house. It has a built-in furnace that works, however it makes horrible grinding sounds. I believe it is the blower motor which is no longer available. I have installed a Dickinson marine heater and a Webasto diesel heater which work fine, but I would like to get a normal RV furnace that has thermostat control and something that has higher BTU output.

I am planning to pull out the stock furnace and replace it with a Suburban NT-SEQ or NT-20SEQ furnace. I know I will need to pull out all of the vents and find some way to seal the outside (maybe an aluminum panel or hard-board insulation) since the replacement is smaller. I like that the new furnace is only about 3 amps usage.

Is there anything else I should be planning for? I did some research of people downsizing their furnace from ducted to ductlesss but didn't find anyone who actually did it.

Thanks,

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Old 09-25-2021, 06:46 AM   #2
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From what you posted, it seems this arrangement is temporary while you build your home. With that in mind, if it were me(I know it’s not), I would research what I could do to eliminate the ‘grinding noise’. Maybe the bearings just themselves can be replaced? Maybe they can be oiled, or greased every so often? Just a thought.
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Old 09-25-2021, 08:15 AM   #3
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Is there much difference in price between ductless and ducted that will move heat to rear better. The motor per OEM part # may not be available but same spec. motor may be available. I have had to cut shaft/s shorter on AC fans before.
I see RV furnaces on FB marketplace and eBay. Also there are many RV part places that have old stock parts that my have a motor.
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Old 09-25-2021, 11:06 AM   #4
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I thought of just pulling out the old blower motor to see if I can get a model # on it or find a similar one, but I am concerned about the large amp draw as well.

I think the bearings probably just need to be greased. I'll have to see if I can pull it out. Maybe there are some markings on the old blower motor?

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Old 09-25-2021, 03:44 PM   #5
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If it puts out more btus and moves more heat through MH better, fan will run less so draw may be a draw or close.
Motor may have just bushings but oil on felt dries out . When we were teens
and poor ,I drilled small holes and oiled car fans with mixed success. I can get a fan now on internet for about what they cost then.
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