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HVAC, Air Conditioners, Aqua Hot, Primus, Webasto, Chassis Heaters, Furnaces and Water Heaters Questions and information about the wide variety of Heating and Air Conditioning as well as Water Heater systems available are discussed here.

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  #1  
Old 10-11-2015
79Ranger 79Ranger is offline
Redneck quadder
 
Join Date: Oct 2014
Location: Westlock
Posts: 270
Default Furnace repair with photos

When I took possession of my 'Bird, I knew that the rear furnace wasn't producing heat and that it would need to be looked at.

Figured I'd give it a try today.

The furnace is a model NT-16SW. The fan would cycle on but no heat and there was no way of attempting to troubleshoot it in place.

First thing was to remove the exterior intake/exhaust escutcheon where I found that there wasn't much of a seal on it and there was water trapped inside the wall with a good amount of rust and soaking wet fiberglass.

I used a bunch of shop towels to get what water I could mopped up and left it open to dry out, tomorrow I will take an air line out to dry it out.
When I go to reassemble, some high heat fireplace silicone will be used along with some Rockwool arounnd the tubes.






A connector on those wires would have been nice, which will be done.













I got the pig out and took it to the bench, checked out the sail switch, high limit and checked the gas valve coils, all checked out.

Went to check the flame sensor/ignitor and of course the screws were rusted and one broke, fixed that by tapping out to 10/32.










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Duncan
Alberta
1988 XXV 40WB

Last edited by iamflagman; 10-13-2015 at 03:22 AM.
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  #2  
Old 10-11-2015
tulipvendor50's Avatar
tulipvendor50 tulipvendor50 is offline
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Join Date: Dec 2007
Location: Kitimat,
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Default Furnace repair

Well, did you get it working??
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Bill
1972 Boler "Sad Shack"
Birdless but looking!!!!!!!!!!!
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Old 10-11-2015
79Ranger 79Ranger is offline
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Join Date: Oct 2014
Location: Westlock
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The ignitor was slightly out, cleaned it and readjusted and everything fired right up. I blew the combustion chamber out and resealed the intake area.

The gasket around the ignitor was fine so I left it after cleaning up the surface, the motor was a little stiff and noisy and so I figured I'd see if something could be done with it.
Commutator was a little dirty and the felts around the bushings were dry.
Brushes looked alright though.

I took some wire wool and polished the shafts and then dripped some light oil into the felts.











Got the interior all cleaned up and then started to extend wires where they will terminate in an accessible location!
Crimps will be soldered then a sealant type heat shrink used and will be terminated in a Weatherpack connector.







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Duncan
Alberta
1988 XXV 40WB
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Old 10-11-2015
79Ranger 79Ranger is offline
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Quote:
Originally Posted by tulipvendor50 View Post
Well, did you get it working??
I can only type so fast

Yes it does and I will be finishing it off tomorrow.
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Duncan
Alberta
1988 XXV 40WB
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  #5  
Old 10-11-2015
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78bbird 78bbird is offline
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Location: Mariposa
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Good JOB!! That is what I wood do. I have got mine running the same way!
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Mark Donahue, Mariposa, CA
1978 FC 33', SB.
donelec@sti.net
2006 Jeep TJ Wrangler X
See my Album!
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  #6  
Old 10-11-2015
Orvie6574 Orvie6574 is offline
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Location: Edenton
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It's fun to be able to do this of stuff, think about it,
who else do you know that does this....
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Orville Mason
Edenton, NC
1978 31 FC
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  #7  
Old 10-12-2015
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sfedeli sfedeli is offline
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Location: Hershey
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This was an excellent write-up! Thanks for taking the time to post pics and document each step. It's a great resource for anyone servicing one of the NT furnace models.

Be careful with the two brown wires that go to the sail switch... they are often a point of failure due to contact with upper crimp on the combustion chamber. The blower fan also is situated close to those wires. Of the numerous furnaces that I have serviced for owners, roughly 70% were failing due to melted/shorted brown wire touching the crimp on the combustion chamber.
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Shane Fedeli
85PT40
Hershey, PA

"Savor the wine of youth, for it is a drink that can be consumed only once”
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Old 10-12-2015
CaptPegLeg CaptPegLeg is offline
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Join Date: Jun 2013
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Nice write up and photos. It's amazing what you can do with a Samsung phone.
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Bob Sumners
1993 WB
1983 PT35 Sold
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Old 10-12-2015
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jyclegg jyclegg is offline
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Location: Maggie Valley
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When can you come and do mine? !! Ha!
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Jon Clegg
1988 WB40PT "Paradise"
Cross Creek RV Park, Maggie Valley NC
www.xcreekrv.com
35°31'08.6"N 83°03'38.8"W
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  #10  
Old 10-12-2015
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sfedeli sfedeli is offline
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There will be a Suburban Furnace workshop at Pine Mountain next week. You pull it, we'll try and fix it. (I don't do cat / dog hair, dust bunnies or fossilized Cherrios crawling around the floor of someone else's bus) We will have LP, a 12V supply and a limited number of parts for testing. Coachcraft is only a few miles down the road and normally has a supply of new parts.
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