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Old 03-07-2018, 10:05 PM   #1
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1970 29' Ambassador
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Where is the model number for furnace?

Hi All,
In yet another departure from my normal "replace the rear floor of our 1970 Ambassador" thread, I have a question or two regarding the furnace.
The only markings I can find so far indicate that it is a Suburban furnace. Where do I look to identify it more specifically?
I have been reading as many posts as I can about this topic (identification) and the furnace in general. This unit looks to be in very good condition -- fan bearing looks good, virtually no rust found so far, and even the rubber is still pliable. It spent its life in California, and likely did not get much use before the mud daubers and mice moved in..
I am tearing this apart with the intention of finding faults with this unit, and so far cannot find any. Obviously, before using the thing I will have it verified at the local shop, and also have a functioning Co2 monitor in the AS.
What else should I be looking for? And again, how do I identify which model it is? I have not seen a plate anywhere (yet).


Thanks,
David
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Old 03-07-2018, 10:52 PM   #2
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If it is original it is probably a NT30. Did you take off the front cover?

Old furnaces tend to look OK, but do you really want a furnace pushing 50 years old in your living space?

It may be very difficult to find any RV technician to even look at it for liability reasons. Also parts are not available.

You need a CO detector not a CO2 detector. Personally, I would not sleep in a trailer that also does not also have a propane detector and smoke alarm.

Not that difficult to install a new Suburban. The air intake and exhaust are the same configuration. The biggest problem will be fabricating a new plenum. So much easier to use.
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Old 03-08-2018, 08:53 AM   #3
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Hi Lum,
Thanks. I did start to tear it apart, but maybe I have not gotten far enough. I will try to find an image of the NT30 to confirm.


Thanks!
David
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Old 03-08-2018, 09:12 AM   #4
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As often happens…..

I can not answer your question on location of model number. But….

1. Visually inspecting motor bearings is not enough. I say, briskly spin the fan manually. It should spin for almost a minute.

2. The early 70s era furnaces are not made any more. The replacement is "almost " the same, but requires a little jerry rigging to install.

3. Having your old furnace taken out, rebuilt, and reinstalled will cost enough to make you consider putting in a new one. Maybe the safest bet anyway.

These are just opinions based on my experience. Please correct me if I am wrong.
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Old 03-08-2018, 09:59 AM   #5
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Hi Man,
Thanks. I don't even know how to visually inspect a bearing :-) but I will be removing it, cleaning it or replacing it, depending on the condition of the rest of this thing. The fan did spin freely after the mouse nest was removed.
Time and a much closer further inspection will determine if this furnace is in as good of condition as it appears. And I understand that looks can be very deceiving, so I am approaching this with the view that it probably will fail, rather than pass. It is a matter of where, and how minor/major the fail is...


Thanks,
David
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Old 03-08-2018, 11:18 AM   #6
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Quote:
Originally Posted by 2002sheds View Post
Hi Man,
Thanks. I don't even know how to visually inspect a bearing :-)
Thanks,
David
The bearing and the motor are a sealed unit.
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Old 03-08-2018, 11:25 AM   #7
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Hi Lum,
Thanks. I only got a cursory glance at it yesterday. Good to know.


Thanks,
David
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Old 03-08-2018, 11:37 AM   #8
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The big issue for safety would be "ANY" cracks in the heat exchanger due to age linked metal fatigue.
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Old 03-08-2018, 11:42 AM   #9
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Hi S,
Thanks -- that is one of the big ones I am looking for... the next step will be to find some time to get further inside this thing. So far, I have only had about 10 minutes on it. The "radiator" hose between the sides is pliable (I would probably still replace it with something from an automotive supply place) and the fan spins freely. All other bets are off until I get a good look at the heat exchanger.


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David
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Old 03-08-2018, 03:21 PM   #10
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Hi S,
TThe "radiator" hose between the sides is pliable
Thanks,
David
that "hose" is the crossover tube. Deterioration of the crossover tube let carbon monoxide into the trailer and was the reason the NT28 furnace was recalled.
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Old 03-08-2018, 03:37 PM   #11
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Old 03-08-2018, 10:36 PM   #12
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Hi Lu, Din,
Thanks. Lu, I'm pretty sure that it is radiator hose. I just need to keep looking to find it... just kidding. i didn't have the terminology memorized when I responded to Switz.
Dingo, thanks for the pic. I will try to find the badge tomorrow.


Thanks,
David
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Old 03-09-2018, 02:00 PM   #13
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In 1974 I witnessed an emergency crew extract 3 people from an 1972 Airstrem with a cracked heater plenum. The father, a smoker, was unconscious, the mother was concious , but dazed. A baby, laying near the floor was OK. I would never use an old furnace for the above reason.
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Old 03-09-2018, 03:23 PM   #14
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I'm not putting my old one back in.
Too rusty & too scary.
I had it bench tested & it worked fine but I don't trust it.
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