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  1. #1
    Join Date
    Aug 2009
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    28

    American Standard AC with York furnace?

    My tech is recommending the switch as he prefers AS over York for cooling.

    Another company we like prefers Carrier.....

    Thoughts and suggestions welcome.

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,104
    No real problem.
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    How many times must one fix something before it is fixed?

  3. #3
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,184
    As long as the indoor coil is matched to the A/C and there is proper airflow, no problem. Only issue would be efficiency ratings that require a specific ECM blower inside, usually above 14 SEER.

  4. #4
    Join Date
    Aug 2009
    Posts
    28
    Thanks....another question.

    Since we have a two-stage furnace, does the AC need to be two-stage, as well?

    If so, and we go with two-stage, does it help humidity issues more than single stage?

  5. #5
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,184
    If you have a variable speed furnace, you CAN use a 2 stage A/C. With standard blower, even if 2 stage gas, really not the optimum way to utilize the advantages of a 2 stage A/C.

  6. #6
    Join Date
    Aug 2009
    Posts
    28
    Thanks, BL.

    We do have a two stage blower in the furnace.

    Would we benefit, particularly lowering humidity wise, going with two stage AC?

  7. #7
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,184
    Is it a variable speed blower? Know the model # of the furnace?

  8. #8
    Join Date
    Sep 2002
    Location
    I don't know
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    2,903
    With standard blower, even if 2 stage gas, really not the optimum way to utilize the advantages of a 2 stage A/C.
    Can't it be done with an additional relay?
    Last edited by beenthere; 09-12-2009 at 04:30 AM.
    General public's attitude towards our energy predicament: "I reject the reality of finite resource depletion and substitute it with my own; energy is infinite, we just need an alternative storage medium to run the cars on. The economy can grow indefinitely - we just need to "green" everything! Technology is energy! Peak what?"

  9. #9
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,104
    Quote Originally Posted by amd View Post
    Can't it be done with an additional relay?
    Usually not. Can't control the blower speed enough.

    Fanhandler and ICM both make a control that can be added. But, you still don't get the same operation as a VS blower.
    You either loose some A/C efficiency, or humidity control with both of them.
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  10. #10
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    any "2 stage" blower these days IS most likely a variable speed motor

    now, if we only knew the model and serial number



    .

  11. #11
    Join Date
    Aug 2009
    Posts
    28
    The furnace is a York Affinity PVC9CONUP11 92.02 two-stage (left old condenser coil)

    White Rogers IF85-275 programmable thermostat.

    The old AC is a 15 year old Concept (still looking for info)-don't think I have the manual anymore.....believe it is 4 ton...2900 sq ft house

  12. #12
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,104
    That furnace will work fine with a 2 stage A/C. Its a VS blower.
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  13. #13
    Join Date
    Aug 2009
    Posts
    28
    Thanks!

    But............does a two stage eliminate MORE humidity?

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