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06-19-2008, 04:07 PM #1
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...