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  1. #1
    Join Date
    Feb 2006
    Location
    Rhode Island
    Posts
    1
    I have a air handler in the attic, part of a Hyrdo Air system, not quite sure of the size. The unit short cycles, comes on for 10 seconds or so, goes off, does it again, then on for a short period of time.

    The unit also produces a whistling noise in some of the rooms in the second floor. I had my service company out to look at it, they added a return, but the problems seem to be getting worse. Any suggestions!

  2. #2
    Join Date
    Sep 2004
    Posts
    3,157
    have a competant hvac contractor out to do a manual J and a ,manual D to determine if you have an oversized unit and to determine the proper duct size for your unit. It sounds like you have an oversized unit and ductwork that is to small

  3. #3
    Join Date
    Sep 2004
    Posts
    654
    Short cycling of air handlers can be many reasons, but if the fan is controlled by an aquastat, making a tuning adjustment to that will eliminate short fan cycles. Thermostat settings can reduce or eliminate short cycling as well. Call a pro.

  4. #4
    Join Date
    Feb 2006
    Location
    New England
    Posts
    135
    Make sure the aqua stat is on the hot water in line and not the water out line also see if you can set the differencial on the aquastat to at least 20*

    Air flow and ducts being too small and or not sealed tight cause noisy operation. Also cheap return registers can sing

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