Fan limit switch interchange

[DOC-BA]

Good afternoon,

I recently traded for an old LPG unit heater that I would like to run in my shop. I have looked it over pretty careful and feel the after re-wiring it will be fine, however, I can't find an interchange for the fan limit switch. Any chance y'all could point me in the right direction?

It says it a “Type A” and the patent number (2394747) is from 1946. It would control a 120v fan. The furnace is a Bryant and the model number is 85A. I have some pictures, but am unsure of how to post them with photobucket no longer being free.

 

[naturalgas]

Why rewire?


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[zmaxmotorsports]

Need a picture of the existing limit.

 

[DOC-BA]

Naturalgas, because the original wire is cloth coated and has been a relatively high humidity area probably since 1946 (date of the us patent). I think some new wire and components would go a long way to helping my peace of mind.

Zmaxmotorsports, I'll get some posted. Have to find a new way of hosting them first.

Thanks,
BA

 

[naturalgas]

Check out Sensata Technologies fan & limit klixons.


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[Done That]

Look at White-Rodgers 5D51 Series Universal Fan & Limit controls, like 5D51-35.

 

[DOC-BA]

I was sick yesterday so I didn't get to check out the suggested information yet. here are the pictures I promised.

 

[DOC-BA]

I've looked at the suggestions and I'm still lost. I guess if there isn't a direct replacement how would i tell the temp range to find something that would, electronically speaking, do the same job? Or, if there sort of a middle of the road set of temps that would work in this application?

 

[Bert_]

In my experience, unless the existing wiring is literally falling apart, you aren't doing yourself any favors by rewiring it. If it's in good shape leave it alone...