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  1. #1

    variable speed furnace.please help

    I have a 90% york furnace system in my house ,with single stage heat & cool,and now i want to install a 15 seer affinity 410 A/C system(2 speed compresor),but the dealer tell me need a varialbe furnace,so can i convert the furnace (BLOWER) to 2 stage cool?any idea please.MY ENGLISH NOT VERY WELL,PLEASE ASK IF YOU ARE NOT UNDERSTAND.

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,750
    ICM makes a control that can vary the speed of your blower, so that you can use a 2 stage A/C on that furnace.
    Not as good as a VS motor. But it works.

    Your contractor may not know about it.
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  3. #3
    Thanks for reply,but can you tell me more about this control.thanks

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,750
    It uses temp sensors to determine how fast to run the blower.
    In cooling, it slows the blower to maintain the temp the tech sets.

    In first stage, it will slow theblower until the discharge air temp is at set point.
    Then when the A/C goes to second stage, it will increase the blowers speed as the air gets colder.(up to the motors rated speed)

    It simply regulates blower speed by temp.

    A VS blower regulates its speed based on static pressure/torque, to move the CFM its set for.
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  5. #5

    Message to beenthere

    beenthere,
    Please see a request for help with Hydrokinetics. You may be close to my area, and from my reading, you seem knowledgeable with Hydrokinetics. How do I find contact information?....Thanks.

  6. #6
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Quote Originally Posted by DMK52 View Post
    beenthere,
    Please see a request for help with Hydrokinetics. You may be close to my area, and from my reading, you seem knowledgeable with Hydrokinetics. How do I find contact information?....Thanks.
    Contact info is in his profile;

    http://www.hvac-talk.com/vbb/member.php?u=22076

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,750
    I posted the name of a company I know that might service your area, in the hydro thread.
    Your outside my range.

    But I'll answer any questions you have.
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  8. #8
    Join Date
    Sep 2007
    Location
    KY
    Posts
    79
    Quote Originally Posted by calimanmancali View Post
    I have a 90% york furnace system in my house ,with single stage heat & cool,and now i want to install a 15 seer affinity 410 A/C system(2 speed compresor),but the dealer tell me need a varialbe furnace,so can i convert the furnace (BLOWER) to 2 stage cool?any idea please.MY ENGLISH NOT VERY WELL,PLEASE ASK IF YOU ARE NOT UNDERSTAND.
    check ARI ratings you most likely will not get advertised SEER with out VS blower
    I'm lost, I've gone to look for myself.

  9. #9
    Join Date
    Dec 2007
    Location
    East central Indiana
    Posts
    477
    Quote Originally Posted by chlosum View Post
    check ARI ratings you most likely will not get advertised SEER with out VS blower
    Didn't Nordyne try to pass off a unit that reached 13 SEER with a variable speed blower, only to have it rejected, because units have to be rated with a standard blower?

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