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  1. 06-19-2008, 04:07 PM #1
    Jersey ED
    Jersey ED is offline Regular Guest
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    Jun 2008
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    Question about York Affinity PV9 series

    Just got a new York 94% efficiency furnace with variable speed ECM motor. When the blower motor starts, it makes a bumping noise / vibration for about 5 seconds, rattling the ducts even. York contractor says all ECM motors do this on start. Can anyone experienced with these motors tell me if it is normal? Many thanks...
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  2. 06-19-2008, 05:47 PM #2
    beenthere's Avatar
    beenthere
    beenthere is offline Global Moderator
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    The ECM is checking its self for correct rotation. Its common for all ECM blowers to do it.
    If your ductwork is metal, he should have used a flex connector to isolate the furnace/AC coil from the duct.
    Contractor locator map

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