Evaporative cooler question

Discussion in 'Home Repair' started by Ken Knecht, Mar 18, 2007.

  1. Ken Knecht

    Ken Knecht Guest

    I put a new two-speed blower motor in my evaporative cooler yesterday.
    The motor makes a pretty loud buzzing/humming noise. It does it with belt
    off so it's the motor, not the blower. It's not the water pump. Checked
    current draw with clamp-on meter and it's slightly (0.1 A or so) below or
    equal to rated current marked on motor with the belt on. It's louder on
    low speed - maybe because blower is quieter?). Other than the noise it
    seems to work ok. I ran it for about 9 hours yesterday at low speed
    (which I normally use) with no problems.

    Just ignore the noise? I can live with it if it isn't trying to tell me
    it's in trouble.

    TIA.

    Ken


    --
    Untie the two knots to email me

    Every silver lining has a cloud.
    Ken Knecht, Mar 18, 2007
    #1
  2. Ken Knecht

    Lawrence Guest

    On Mar 18, 9:42 am, Ken Knecht <> wrote:
    > I put a new two-speed blower motor in my evaporative cooler yesterday.
    > The motor makes a pretty loud buzzing/humming noise. It does it with belt
    > off so it's the motor, not the blower. It's not the water pump. Checked
    > current draw with clamp-on meter and it's slightly (0.1 A or so) below or
    > equal to rated current marked on motor with the belt on. It's louder on
    > low speed - maybe because blower is quieter?). Other than the noise it
    > seems to work ok. I ran it for about 9 hours yesterday at low speed
    > (which I normally use) with no problems.
    >
    > Just ignore the noise? I can live with it if it isn't trying to tell me
    > it's in trouble.
    >

    Any kind of noise means trouble. No motor last forever and your will
    not either. So long as it's running and the noise doesn't bother you
    then fine. When it starts shaking or vibrating then the end is near.
    Small motors like that aren't usually repaired but they can be.

    Sometimes you can blow the dust out and oil the motor. Small motors
    like that are sometimes have a place that says "oil". It may be
    possible to have it repaired if you are determined.

    Why not got ahead and buy a replacement? Then you can have the old
    motor looked at with the minimum downtime. Worst case: old motor not
    worth repairing but is still a good backup. In the meantime you have
    a quiet smooth running motor.
    Lawrence, Mar 18, 2007
    #2
  3. Ken Knecht

    Ken Knecht Guest

    "Lawrence" <> wrote in
    news::

    > On Mar 18, 9:42 am, Ken Knecht <> wrote:
    >> I put a new two-speed blower motor in my evaporative cooler
    >> yesterday. The motor makes a pretty loud buzzing/humming noise. It
    >> does it with belt off so it's the motor, not the blower. It's not the
    >> water pump. Checked current draw with clamp-on meter and it's
    >> slightly (0.1 A or so) below or equal to rated current marked on
    >> motor with the belt on. It's louder on low speed - maybe because
    >> blower is quieter?). Other than the noise it seems to work ok. I ran
    >> it for about 9 hours yesterday at low speed (which I normally use)
    >> with no problems.
    >>
    >> Just ignore the noise? I can live with it if it isn't trying to tell
    >> me it's in trouble.
    >>

    > Any kind of noise means trouble. No motor last forever and your will
    > not either. So long as it's running and the noise doesn't bother you
    > then fine. When it starts shaking or vibrating then the end is near.
    > Small motors like that aren't usually repaired but they can be.
    >
    > Sometimes you can blow the dust out and oil the motor. Small motors
    > like that are sometimes have a place that says "oil". It may be
    > possible to have it repaired if you are determined.
    >
    > Why not got ahead and buy a replacement? Then you can have the old
    > motor looked at with the minimum downtime. Worst case: old motor not
    > worth repairing but is still a good backup. In the meantime you have
    > a quiet smooth running motor.
    >
    >


    It's a brand new motor.

    More info. I took the motor off its mounts and it's almost silent.
    Evidently the noise is slight and being greatly amplified by the blower
    housing it's mounted on.

    Ken



    --
    Untie the two knots to email me

    Every silver lining has a cloud.
    Ken Knecht, Mar 18, 2007
    #3
  4. Ken Knecht

    dpb Guest

    On Mar 18, 10:07 am, Ken Knecht <> wrote:
    > "Lawrence" <> wrote innews::
    >
    >
    >
    >
    >
    > > On Mar 18, 9:42 am, Ken Knecht <> wrote:
    > >> I put a new two-speed blower motor in my evaporative cooler
    > >> yesterday. The motor makes a pretty loud buzzing/humming noise. It
    > >> does it with belt off so it's the motor, not the blower. It's not the
    > >> water pump. Checked current draw with clamp-on meter and it's
    > >> slightly (0.1 A or so) below or equal to rated current marked on
    > >> motor with the belt on. It's louder on low speed - maybe because
    > >> blower is quieter?). Other than the noise it seems to work ok. I ran
    > >> it for about 9 hours yesterday at low speed (which I normally use)
    > >> with no problems.

    >
    > >> Just ignore the noise? I can live with it if it isn't trying to tell
    > >> me it's in trouble.

    >
    > > Any kind of noise means trouble. No motor last forever and your will
    > > not either. So long as it's running and the noise doesn't bother you
    > > then fine. When it starts shaking or vibrating then the end is near.
    > > Small motors like that aren't usually repaired but they can be.

    >
    > > Sometimes you can blow the dust out and oil the motor. Small motors
    > > like that are sometimes have a place that says "oil". It may be
    > > possible to have it repaired if you are determined.

    >
    > > Why not got ahead and buy a replacement? Then you can have the old
    > > motor looked at with the minimum downtime. Worst case: old motor not
    > > worth repairing but is still a good backup. In the meantime you have
    > > a quiet smooth running motor.

    >
    > It's a brand new motor.
    >
    > More info. I took the motor off its mounts and it's almost silent.
    > Evidently the noise is slight and being greatly amplified by the blower
    > housing it's mounted on.


    Add some isolation. I keep an old bicycle inner tube around for
    making such from...
    dpb, Mar 18, 2007
    #4
  5. Ken Knecht

    Lawrence Guest

    On Mar 18, 11:07 am, Ken Knecht <> wrote:
    > "Lawrence" <> wrote innews::
    >
    >
    >
    >
    >
    > > On Mar 18, 9:42 am, Ken Knecht <> wrote:
    > >> I put a new two-speed blower motor in my evaporative cooler
    > >> yesterday. The motor makes a pretty loud buzzing/humming noise. It
    > >> does it with belt off so it's the motor, not the blower. It's not the
    > >> water pump. Checked current draw with clamp-on meter and it's
    > >> slightly (0.1 A or so) below or equal to rated current marked on
    > >> motor with the belt on. It's louder on low speed - maybe because
    > >> blower is quieter?). Other than the noise it seems to work ok. I ran
    > >> it for about 9 hours yesterday at low speed (which I normally use)
    > >> with no problems.

    >
    > >> Just ignore the noise? I can live with it if it isn't trying to tell
    > >> me it's in trouble.

    >
    > > Any kind of noise means trouble. No motor last forever and your will
    > > not either. So long as it's running and the noise doesn't bother you
    > > then fine. When it starts shaking or vibrating then the end is near.
    > > Small motors like that aren't usually repaired but they can be.

    >
    > > Sometimes you can blow the dust out and oil the motor. Small motors
    > > like that are sometimes have a place that says "oil". It may be
    > > possible to have it repaired if you are determined.

    >
    > > Why not got ahead and buy a replacement? Then you can have the old
    > > motor looked at with the minimum downtime. Worst case: old motor not
    > > worth repairing but is still a good backup. In the meantime you have
    > > a quiet smooth running motor.

    >
    > It's a brand new motor.
    >
    > More info. I took the motor off its mounts and it's almost silent.
    > Evidently the noise is slight and being greatly amplified by the blower
    > housing it's mounted on.
    >

    Try mounting the fan through pieces of eurethane foam or similar to
    reduce vibrations and noise.
    Lawrence, Mar 18, 2007
    #5
  6. Ken Knecht

    Steve B Guest

    "Ken Knecht" <> wrote in message
    news:Xns98F74E7E28DAAkenkderucom@140.99.23.22...
    >I put a new two-speed blower motor in my evaporative cooler yesterday.
    > The motor makes a pretty loud buzzing/humming noise. It does it with belt
    > off so it's the motor, not the blower. It's not the water pump. Checked
    > current draw with clamp-on meter and it's slightly (0.1 A or so) below or
    > equal to rated current marked on motor with the belt on. It's louder on
    > low speed - maybe because blower is quieter?). Other than the noise it
    > seems to work ok. I ran it for about 9 hours yesterday at low speed
    > (which I normally use) with no problems.
    >
    > Just ignore the noise? I can live with it if it isn't trying to tell me
    > it's in trouble.
    >
    > TIA.
    >
    > Ken


    What you are experiencing may be a harmonic effect. With the motor NOT
    connected to the belt, all the vibration is transferred to the metal
    framework with no dampening effect from the rubber belt.

    I'd try it with the belt. If there's still a loud hum, then check out the
    electrical end.

    Mine works perfectly, and has a lot of hum and noise. I think it's just the
    nature of the beast. You may also get some thick grommets with which to
    mount the motor that may take out some of the hum if yours is mounted metal
    on metal. I'd try the cheap fixes before digging too deep.

    Sometimes the problems are the simplest and most obvious little things.

    Steve, an old swamp cooler veteran
    Steve B, Mar 18, 2007
    #6

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