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  1. #1
    Join Date
    Mar 2020
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    generator running ac unit

    Hi, I am new to this forum. I have a 15,000 continuous watt/ 22,000 surge watt backup generator. I have attached a picture (if I did that correctly) of the information label on the outside unit. I also have an air handler in my attic but do not have any specific information on it. I tested the generator and it will indeed run my unit, but seemed like the unit fan outside and the air handler inside were running slower than normal. My question is should this generator be able to run this unit (with no other load except a couple of led lights) and if the unit is indeed running slower can that cause damage to the unit. Any help would be appreciated. Thank you.

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  2. #2
    Join Date
    Aug 2015
    Location
    Buffalo,NY
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    Well 15,000 watts is 62.5 Amps. According to your data tag your condenser consumes 19.5 Amps. Now depend on air handler and whatever else is running off the switch you should be ok. But only diagnostic equipment is truly going to answer your question.


    Sent from my iPhone using Tapatalk

  3. #3
    Join Date
    Sep 2002
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    What was the voltage and frequency at the AC unit while it was operating?

    PHM
    ---------


    Quote Originally Posted by whitcarroll24 View Post
    Hi, I am new to this forum. I have a 15,000 continuous watt/ 22,000 surge watt backup generator. I have attached a picture (if I did that correctly) of the information label on the outside unit. I also have an air handler in my attic but do not have any specific information on it. I tested the generator and it will indeed run my unit, but seemed like the unit fan outside and the air handler inside were running slower than normal. My question is should this generator be able to run this unit (with no other load except a couple of led lights) and if the unit is indeed running slower can that cause damage to the unit. Any help would be appreciated. Thank you.

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Views: 288
Size:  77.8 KB
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  4. Likes dan sw fl liked this post.
  5. #4
    Join Date
    Oct 2014
    Location
    Saint Pail, Minnesota
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    This sounds like a AOP topic.

  6. #5
    Join Date
    Dec 2006
    Location
    Vancouver, B.C.
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    Check your frequency and report back.


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  7. #6
    Join Date
    Mar 2010
    Location
    Woodbridge, VA
    Posts
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    Newer HVAC motors (non-psc) do not like dirty power from generators. Will it work? Yes in most cases. Will you have problems? I've seen quite a bit.

  8. #7
    Join Date
    Jan 2004
    Location
    PA
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    Moved to AOP.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  9. #8
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
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    If you want A/C on a generator get a small window shaker and plug it in.

  10. #9
    Join Date
    Sep 2002
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    How about mini splits? Would they work OK on generator power?

    PHM
    --------


    Quote Originally Posted by pecmsg View Post
    If you want A/C on a generator get a small window shaker and plug it in.
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  11. #10
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
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    Quote Originally Posted by Poodle Head Mikey View Post
    How about mini splits? Would they work OK on generator power?

    PHM
    --------
    Minis with an invertor compressors are your best bet for having enough power available to get the compressor up to speed. Again the smallest possible is the key.
    The OP is showing a 3 1/2 -Ton A/C that draws several hundred amps on start up.

  12. #11
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    9,999
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    Quote Originally Posted by ziggyhere View Post

    Newer HVAC motors (non-psc) do not like dirty power from generators.

    Will it work? Yes in most cases.

    Will you have problems? I've seen quite a bit.
    OP, Did you measure the Voltage AT THE CONDENSER?

    Running Amps is not an issue, IF the actual voltage is > 210 V.

    Start-up Amps could be a problem.
    However, the duration might be < 1 second.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  13. #12
    Join Date
    Mar 2009
    Location
    Mount Holly, NC
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    7,762
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    That equipment came with either no startup aids, or a thermistor aid...
    I would recommend you have installed 521 compressor saver start assist kit.
    This will help your system operate properly on startup by drastically reducing the startup surge duration
    The TRUE highest cost system is the system not installed properly...

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    https://hvac-talk.com/vbb/forumdispl...ip-Information

    Do you go to a boat repairman with a sinking boat, and tell him to put in a bigger motor when he tells you to fix the holes?

    I am yourmrfixit

  14. #13
    Join Date
    Dec 2007
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    9,509
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    Quote Originally Posted by ziggyhere View Post
    Newer HVAC motors (non-psc) do not like dirty power from generators. Will it work? Yes in most cases. Will you have problems? I've seen quite a bit.
    Me too!!!
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

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