Thread: High Efficiency gas furnace - return air temperature
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Speedy Jim Speedy Jim is offline
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Default High Efficiency gas furnace - return air temperature
wrote:
The unit in question is Goodman GMV9509050XBA gas furnace (95% eff.,
90,000 BTU.)
It says in the Installation Instructions (page 7, Location Requirements
& Considerations) that the following must be observed:

"The temperature of the return air entering the furnace is between 55F
and 100F when the furnace is heating."

Yep, they spec that so that condensation is unlikely
to occur in the main (pri) heat exchanger, which could
cause early failure.

It can become a warranty issue (if you care).

Jim
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