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  1. #1

    Humming/whirring type noise from swamp cooler

    For the last few years, whenever the swamp cooler (roof mount) is turned on, whether it's in vent or cooling mode, it makes a very loud huming/whirring noise (kind of like an air raid siren that's very low pitched, or a vacuum in the other room). It supposedly started the year after installation. The air blows nice and hard.

    Is it just a poorly designed swamp cooler, and should we look for a new one? Would a swamp cooler make a noise like that if it was set up improperly? Maybe they put in a motor that was too large? Could they have wired it up backwards, and if so would the fan blades spinning the wrong direction make a noise like that? It replaced a previous swamp cooler, so the ducting and mounts did not change, just the unit and everything inside.

    I'm just looking for some basic advice, if the swamp cooler itself is poorly designed we'll have to get a new one installed, but if it's something else I'd like to get it repaired.

  2. #2
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,317
    In vent mode, the water pump does not run. In cooling mode, it does. But you hear the sound in both modes. That probably rules out the water pump.

    Does the blower have more than one speed? Does the sound occur on all speeds if it does, or just one certain speed?

    How clean are the pads? Is there a buildup of mineral deposits on the louvers where air is drawn into the pads? Have you had the thing serviced regularly?
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    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


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  3. #3
    It happens at all speeds, but it is MUCH louder when it's on high. Every year we replace the pads, drain and flush it to no effect.

  4. #4
    Join Date
    May 2007
    Location
    Dry as a bone Tucson
    Posts
    4,280

    whirring noise

    Quote Originally Posted by BrentNewland View Post
    For the last few years, whenever the swamp cooler (roof mount) is turned on, whether it's in vent or cooling mode, it makes a very loud huming/whirring noise (kind of like an air raid siren that's very low pitched, or a vacuum in the other room). It supposedly started the year after installation. The air blows nice and hard.

    Is it just a poorly designed swamp cooler, and should we look for a new one? Would a swamp cooler make a noise like that if it was set up improperly? Maybe they put in a motor that was too large? Could they have wired it up backwards, and if so would the fan blades spinning the wrong direction make a noise like that? It replaced a previous swamp cooler, so the ducting and mounts did not change, just the unit and everything inside.

    I'm just looking for some basic advice, if the swamp cooler itself is poorly designed we'll have to get a new one installed, but if it's something else I'd like to get it repaired.
    This is typical of a belt that is tight and/or bearigs that are dry. Take the belt off and see if the blower will spin freely by hand and stays spinning for atleast a minute or more.
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  5. #5
    Turns out there was a flap of metal that directs air flow that was too close to the fan blades, they just had to bend it a bit and problem was gone.

  6. #6
    Join Date
    May 2007
    Location
    Dry as a bone Tucson
    Posts
    4,280
    Cool; cheap easy fix! thanks for the update.
    Some Talk, Some Do
    "keeping condensing pressures low and evaporator pressures high"
    "Some customers are more interested in comfort than energy savings"
    Blog
    Web
    Facebook


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