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  1. #1
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    Mar 2020
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    Run AC with Rusted Out Heat Exchanger?

    I have a package unit gas pack and AC. I discovered in January the heat exchanger is rusted out and I need a new unit. So I heated with the gas logs until tax return time. Now I'm wondering why can't I run the AC and put this expense off even longer lol. Any safety problem with that?

  2. #2
    Join Date
    Aug 2002
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    Southold, NY
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    Quote Originally Posted by CUfan99 View Post
    I have a package unit gas pack and AC. I discovered in January the heat exchanger is rusted out and I need a new unit. So I heated with the gas logs until tax return time. Now I'm wondering why can't I run the AC and put this expense off even longer lol. Any safety problem with that?
    Why put off until tomorrow what you can put off until day after!

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  4. #3
    Join Date
    Jul 2007
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    Virginia
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    Quote Originally Posted by CUfan99 View Post
    So I heated with the gas logs until tax return time. Now I'm wondering why can't I run the AC and put this expense off even longer lol. Any safety problem with that?
    None. As long as you are not turning the gas burners on, you can run the AC all day long.

    Please prepare to replace this unit in the late summer, as you do not want to operate this system with a known cracked heat exchanger (HX) this next heating season.
    Instead of learning the tricks of the trade, learn the trade.

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  6. #4
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    Mar 2020
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    Thread Starter
    Quote Originally Posted by pecmsg View Post
    Why put off until tomorrow what you can put off until day after!
    My man!

  7. #5
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    Mar 2020
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    Thread Starter
    Quote Originally Posted by rundawg View Post
    None. As long as you are not turning the gas burners on, you can run the AC all day long.

    Please prepare to replace this unit in the late summer, as you do not want to operate this system with a known cracked heat exchanger (HX) this next heating season.
    Fabulous! Thanks for the piece of mind and sharing the knowledge!

  8. #6
    Join Date
    Oct 2011
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    Culver, Oregon (Central OR)
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    Quote Originally Posted by CUfan99 View Post
    Fabulous! Thanks for the piece of mind and sharing the knowledge!
    Make sure and turn the gas valve off outside the furnace though, just in case someone else turns the stat to heat.

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  10. #7
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    Mar 2020
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    Thread Starter
    Follow-up question for you guys. Any idea why the fan runs constantly with the stat Off and fan setting on Auto? The only way I can turn it off is by flipping the breaker off.

  11. #8
    Join Date
    Aug 2002
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    Southold, NY
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    Could be a safety tripped or bad relay. Doesn't matter much your going to be replacing it anyway.

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  13. #9
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    Jul 2007
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    Virginia
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    Quote Originally Posted by CUfan99 View Post
    Follow-up question for you guys. Any idea why the fan runs constantly with the stat Off and fan setting on Auto? The only way I can turn it off is by flipping the breaker off.
    Now we are getting into troubleshooting, which this forum does not allow.

    Only testing with a Volt Ohm Meter will determine the actual cause, and prevent guessing, which is in no ones best interest.

    I am curious of the model number of this unit though?
    Instead of learning the tricks of the trade, learn the trade.

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  15. #10
    Join Date
    Sep 2005
    Location
    Atlanta GA area
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    What part of the country are you in???
    Just curious...
    GA-HVAC-Tech

    Your comfort, Your way, Everyday!

    GA's basic rules of home heating and AC upgrades:
    *Installation is more important than the brand of equipment
    *The duct system keeps the house comfortable; the equipment only heats and cools (and dehumidifies)
    *Cheap is not good, good is not cheap; however expensive is not a guarantee of quality!
    Choose your contractor wisely!

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  17. #11
    Join Date
    May 2014
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    Bay Area California
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    The only thing I can add would be to schedule the work for the off season. Might get more competitive pricing.


    Quote Originally Posted by CUfan99 View Post
    I have a package unit gas pack and AC. I discovered in January the heat exchanger is rusted out and I need a new unit. So I heated with the gas logs until tax return time. Now I'm wondering why can't I run the AC and put this expense off even longer lol. Any safety problem with that?
    I do a triple evac with nitro to remove non condensables.

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  19. #12
    Join Date
    Oct 2014
    Location
    Saint Pail, Minnesota
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    Quote Originally Posted by BBeerme View Post
    The only thing I can add would be to schedule the work for the off season. Might get more competitive pricing.
    Or even right now. Everyone is currently sitting at home waiting to work.

    But I understand OP hesitation before rebate comes.

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  21. #13
    Join Date
    Jan 2010
    Posts
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    One advantage of waiting is you prolong your up and coming warranty.

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