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Coleman Furnace Manual request


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#1 jumptrout

jumptrout

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Posted 25 February 2013 - 05:00 PM

Coleman gas furnace model.#7956.

Need manual if available.

Furnace fires,heats up for fan relay to come on.

Fan cycles.

Unit cools quickly and fan stops.

Burner stays lit and repeats above sequence.

Fan limit switch is a 110 degree -20 degree.

Heat exchanger in good condition.

Flue not blocked.



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#2 jumptrout

jumptrout

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  • Appliantology Fellow
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  • 1,380 posts
  • Location: USA
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Posted 07 March 2013 - 08:02 AM

Manual no longer needed.

I deciphered the problem.

Furnace had been operating several years with no drip leg installed on the gas supply.

The gas nozzle and orifice had become 50% restricted with a rust buildup.

Although outlet pressure read good on the manometer,the gas pressure reduced greatly at the burner causing low flame and insufficient heat.

A thorough cleaning of the nozzle and the addition of a drip leg has this furnace working like new.






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