Starting Suburban NT35K repairs

[catson4]

After a lot of research, I find that the Suburban furnace in my 34' 1991 AS ,a model NT35K, is just a larger version of the one in my old 1980 Winny MH, a model NT25K.
The main difference is the NT25K has one intake and one exhaust ports while the NT35K has one intake and TWO exhaust ports. Just more BTU's and more heat.
So repairs are not that much of a problem as I rebuilt the ol' Winny one.
Suburban does NOT offer a direct replacement for this furnace so a repair is the only way to go UNLESS you are willing to remove a section of
outside skin and CUT NEW hole for the intake & exhaust ports.
As I am not wanting to do that, I opted for a rebuild.

This furnace does NOT have any screws that connect the OUTSIDE ports to the furnace. There are only 2 screws that hold everything in place.
They are both inside the front cover and screw into the floor. However, this furnace DOES have a long over-lap of the exhaust / intake port tubes with the exterior port frames.
Remove those 2 screws, disconnect the wiring, the hot air heater ducts (4) and the propane line and out she comes.

The "sail switch" was not working 100% of the time. That was the problem with this 19 year old furnace. And I do not think the "module board" was too damn good either.

Both the ECO ("Energy Cut Off" or high temp cut out) & timed delay switch are working fine and check out well within specs.

After a complete dis-assembly and cleaning, I did not get as much dirt or rust as I expected.
The first photo shows, in the left half, the rust & dirt I collected form INSIDE & OUTSIDE the furnace. The right half shows the dirt from inside BOTH fan blades. Remember this is a 1991 model that had a VERY HEAVY SMOKING P.O. & she lived in this unit for over 5 years. Both batches of gunk are less than 1/16th" deep on the paper.

NOW, the 2nd photo shows the "module board" and why I do not think it works either... A picture is worth a 1000 smokes........

I am ordering all new, gaskets, a new Dinosaur Module Board, sail switch and maybe other parts tomorrow.

I have a question for "the lewster" about this furnace. I am wondering about the "Extend-A-Life" kit from Dinosaur Boards.
But I will discuss that in another topic.

WISHING YOU ALL A "SHINY 2009"

[catson4]

Peter Forwood
Greenville, SC

[catson4]

Peter, sorry for the messed up message. I was adding to it and I guess I took to long a time. to get it posted. As it is late now, I will endeavor to post the info again tomorrow.