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Old 09-06-2015, 01:05 PM   #1
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Replace or Service Suburban NT-25K

I'm finally getting around to wanting to work on the furnace. I took the front cover off my dynatrail furnace and found a lot of corrosion inside and a layer about a half inch thick of mouse or rat **** and acorns packed all around the bottom of the heat exchanger. The corrosion ruined the model sticker so I have no idea what it is other than it's likely a NT-25K or NT-30K unit as it has 3 vent holes instead of 2 on the outside. This is the kind of furnace that does not have a hatch on the outside of the RV and it mates to exhaust vents/tubes affixed to the wall.

I can't find the mounting screws that hold it onto the floor thanks to all the corrosion and mouse ****.

I'm thinking I need to have an RV tech in to just replace the thing with a similar model instead of screwing with this one, particularly since I can't even figure out how to get it loose not to mention not wanting to breath that crap even if it was cleaned out.

Is there a such thing as an RV tech that will come out to your place and install a new furnace if you buy one either online or from them directly? If so how do I go about finding one? I might be able to get this thing into the local RV dealer if we are very careful on the road but it does not have current plates and isn't registered other than transfer of title.

If this was your RV what would you do and how would you go about it?

I want to replace the ducting (flexible dryer hose looking stuff) too since it looks like they got into that as well.
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Old 09-08-2015, 12:57 PM   #2
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I'd start by vacuuming out as much of the furnace interior as you can access. I've used heater hose and fuel hose to reach limited access areas in mine when the standard shop vac hose is too large. Once it is fairly clean, finding the one or two mounting screws just inside the cover should be easy. The exterior intake/exhaust cover likely needs to be removed as well to remove the furnace.
There isn't much to the inner workings of a furnace. A blower motor, valve, burner, ignitor, and control board about wraps up the list. Manuals for either model you listed should be readily available for download.
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Old 09-11-2015, 02:05 PM   #3
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I think I found a local guy willing to swap it out so I can have a clean source of hot air this winter with a lot less added hanta virus.
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Old 10-14-2015, 06:43 PM   #4
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I found a heating and cooling guy willing to do the install, sent him lots of pictures, measurements etc and we decided on a suburban NT-30SP as our replacement. I ordered it on Amazon for 499.99 plus about 36$ or so extra to rush the shipping and get it here by the 9th.

The new furnace wasn't an exact match for the old one so we had to re-route a water line and drill new holes in the wall for the intake and exhaust.

we put in all new ducting and the new system works like a champ.

here's the before pictures:

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Old 10-14-2015, 06:48 PM   #5
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Here's the after pictures:

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Tomorrow I will seal up the old holes with a fiberglass patching kit and I think that should get it done.
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Old 10-18-2015, 04:06 PM   #6
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Went through my first freeze last night and the NT-30SP kept everything toasty warm. I think I should be all set even for sub zero Missouri winters. But we will see. I do plan to get vent cushions, etc for the really bad weather.

I estimate about 160 Sq foot of space tops so I'm hoping 30000 btu/hr will cover it. It's the same btu rating as the old furnace.
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