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  1. I have now had the system professionally (by an...

    I have now had the system professionally (by an HVAC-TALK reference) evacuated, tested, freshly charged - by weighing in - to the exact York specification.

    After two days of careful...
  2. catmanacman, beenthere: thanks for your...

    catmanacman, beenthere: thanks for your guidance.

    It seems that there is no objective measure to know whether the charge is really low - just a best guess based on experience (not to be dismissed...
  3. York Affinity (YZB) HeatPump perpetual defrost

    I have a 3.5 ton (YZB04211A) with matched handler, 4 years old.

    1) Complaint: defrost cycle every 40 minutes, whether needed or not, whenever ambient is less than 50F.

    2) defrost cycle lasts...
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    beenthere: yes, I see that in my manual on...

    beenthere:

    yes, I see that in my manual on page 12 ...

    I take the line:
    "• Energize the auxiliary heat outputs based on the system configuration"
    literally , that is outputs (plural) = more...
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    1,778

    beenthere: model number is: (Z) YZB04211A ,...

    beenthere:

    model number is: (Z) YZB04211A , installed December 2007

    also, the original defrost control board was the non-communicating version, which has apparently been superseded by the...
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    BeenThere: There are three relays controlling...

    BeenThere:

    There are three relays controlling 20kw of resistance heaters in the AirHandler :
    HT1 controls a 5kw heater
    ; HT2 controls a 5kw heater
    ; HT3 controls a 10kw heater bank

    ...
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    beenthere: here's what the York Installation...

    beenthere:

    here's what the York Installation Manual (page 16) states:

    "
    Auxiliary Heat Defrost Operation – Air Handler Mode
    The control will energize W1 Out and W2 Out 45 seconds prior to...
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    beenthere: I'm new here and not quite familiar...

    beenthere:

    I'm new here and not quite familiar with the local etiquette.
    But I wonder why you deleted the comment on my question from au-en-boy since he is listed as a pro.
    It appears that his...
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    1,778

    York Affinity (YZB) HeatPump defrost control

    The York installation manual states that the full auxiliary resistance heat is activated shortly before a defrost until shortly after so as to compensate for the cooling during the defrost cycle.
    ...
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