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Old 01-17-2012, 06:36 PM   #16
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Heil DC90 Limit Trip


Temp Rise 40 - 70 F

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Old 01-17-2012, 06:40 PM   #17
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Heil DC90 Limit Trip


140 minus 69 would equal 1 degree over max temperature rise ALL due to restricted return air. The limit switch is working.

Clear the returns.
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Old 01-17-2012, 07:03 PM   #18
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Heil DC90 Limit Trip


I'm guessing that you probably did your temp rise test with the drapes away from the return air grill & the remodel problems sorted out so you still have a furnace temp problem.
All you've determined is that your limit is working on a furnace that is running too hot.
You can clock your gas meter to see if the furnace is overfired.
See if there is a higher speed tap to use on your blower.
Check the other possible causes of an air flow restriction that have already been posted here.

or call a pro.
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Old 01-17-2012, 07:11 PM   #19
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Heil DC90 Limit Trip


How - Excellent suggestions
Thank you again!

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