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Thread: a/c compressor

  1. #1

    a/c compressor

    my question is simple

    is the a/c compessor supposed to kick on first, then the air handler.

    both my air handler and compressor kick on at the same time.
    big time power surge. some lights dim.
    is something wired wrong, bad breaker. bad thermostat?

    i have seen a few system the compressor kicks on then the air handler.
    i have a old carrier 4 ton unit about 22 years old. has a new compessor
    and been cleaned and service and new blower installed.

  2. #2
    Join Date
    Jun 2003
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    Hell Hole Swamp
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    Depends on the unit, more specifically the type of blower relay, a 22 year old Carrier will have them both turning on at the same time, the compressor is the majority of the start up load so the blower timing wont make much difference.

    a service tech may be able to help you with the light dimming issue, or at least identify the cause.

  3. #3
    Join Date
    Apr 2008
    Location
    Southern New Hampshire (USA)
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    401
    Sounds like this can be solved with a "Time Delay On Make", which any technician should be able to acquire and install for you. This is assuming the system was designed for the two to come in at the same time.

    Is this a new problem, or has it happened since the beginning?

  4. #4
    Quote Originally Posted by nightranger121 View Post
    Sounds like this can be solved with a "Time Delay On Make"
    For better control of comfort, the 'other' model would be better here. And it gives time for pressures to equalize before a restart.

  5. #5
    Join Date
    Dec 2005
    Location
    San Jose, CA
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    465
    depends on modelof unit and thermostat. As stated above you can have any HVAC tech install a time delay to prevent the comp. and fan coming on at the same time.

  6. #6
    Join Date
    Dec 2002
    Location
    Houston,Tx.
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    16,106
    Quote Originally Posted by Swampfox View Post
    22 year old Carrier will have them both turning on at the same time.
    22 year old Carrier your lucky there even still coming on.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

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  7. #7
    Join Date
    Apr 2008
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    Quote Originally Posted by smilies View Post
    For better control of comfort, the 'other' model would be better here. And it gives time for pressures to equalize before a restart.
    Are you suggesting a delay on break? They would still come on at the same time if the unit had been off for the TD setting. It would allow the pressures to equalize, but do nothing for the inrush.

  8. #8
    Join Date
    Dec 2004
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    newton,mass.
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    6,109
    Quote Originally Posted by Mr Bill View Post
    22 year old Carrier your lucky there even still coming on.

    I worked on some over fourty year old Carrier splits this week...still running strong...I have been trying to sell them new systems for over ten years...they think I'm kidding when I tell them (for the last ten years) that this could be the last summer...

    .
    "Nothing else can poison our culture, corrupt our society or ruin the character of our people like unearned money or unearned opportunity." -- James R. Cook

    "Fooling around with alternating current is just a waste of time. Nobody will use it, ever." Thomas Edison, 1889.

  9. #9
    Join Date
    Dec 2002
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    Quote Originally Posted by vmc1161 View Post
    I worked on some over fourty year old Carrier splits this week...still running strong...

    If they were still running strong why did you have to work on them?
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  10. #10
    Join Date
    Jul 2007
    Location
    New Jersey
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    3,031
    That is weird. It's definately a timer or wiring issue. I'm HVAC-R for a steel mill and service plenty of older Carriers models (mostly package units). Almost all of my units are set with 2 stage compressors having both delay on make / and break. The fans constantly run becauseof the intense heat. But even in the office rooftop split systems. The fans would come on before the compressors. Since you haven't mentioned it, I assume you haven't blew any fuses with all that in rush?

  11. #11
    Join Date
    Aug 2002
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    Southold.calm
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    6,052
    Big difference between commercial & residential Tommy.

  12. #12
    yes still running strong.
    i plan on replacing in a couple of years with a bigger unit.
    the 4th bedroom,not cold enough.
    we just purchased house and with gas these days
    wow!

    thank you for all your help.i will get a tech to come and look at it.


    And i will replaced it with a carrier 22 years and still strong.

  13. #13
    p.s no fuses blow

    lights dim in bedroom and living room as a/c kicks on
    i am guess to many amps are being pulled.

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