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Swamp Cooler driving friends nuts

Hi All,

Neighbor called me over to look at his new swamp cooler as the motor is mak ing a lot of noise. We took the fan belt off and the noise level didn't cha nge at either speed. It's a loud humming droning noise that seems to be abo ut the resonant frequency of drywall-walls as we can hear it throughout the house.

We mounted the entire cooler on strips of foam rubber so nothing is touchin g any thing solid to transmit the noise. Still it persists unabated.

Is there any point in pulling the motor apart and seeing if we can make it hum less?

If so, what would we be looking for?

Dave

Reply to
Dave, I can't do that
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aking a lot of noise. We took the fan belt off and the noise level didn't c hange at either speed. It's a loud humming droning noise that seems to be a bout the resonant frequency of drywall-walls as we can hear it throughout t he house.

ing any thing solid to transmit the noise. Still it persists unabated.

It sounds as if the motor is out of balance. Does the motor drive the fan directly?

Anyway you might put a mark on the motor shaft and then give the motor a sp in and see if it steps in about the same place. That would indicate the mo tor is out of balance. Then add weight to get it so the motor has no prefe rence where it stops.

If that is not enough improvement , Take a look at " Orthoganol balancing - twinwheel grinders " back in 09. It is a really good thread started by Jim Pentagrid. He goes into how to use a small computer speaker as a vibratio n sensor, And how to do a really good job of balancing.

Dan

Dan

Reply to
dcaster

Has it got a run capacitor?

Reply to
Spehro Pefhany

Thanks Spehro, but no. Can't find anything in the parts list and no obvious lump on the motor.

Label says HP 13/- 1/10 Type S RPM 1725/1140 SF 1.0 V 115 A 6.1/3.7 Hz 60 AMB 40C FR 56Z Code S TIME Cont HSG Open

Reply to
Dave, I can't do that

Problem solved. They called HD who did not hesitate to say bring it back even though the swamp was sold as a complete window-mount unit with the motor already in it.

New motor is an EC brand. About 1/4 lighter in weight, draws fewer actual Amps when running and is whisper quiet. The wind noise is now louder.

New respect for HD.

Dave

Reply to
Dave, I can't do that

You lucked out. Congrats. Ditto the new respect for HD.

Reply to
Larry Jaques

You had just put a new motor in your old one the first time I came down there to Taft, and we ran to Tractor Supply to find a pulley, IIRC.

Reply to
Larry Jaques

If the others weren't sealed, I'd expect this one to last a wee bit longer, wouldn't you?

Reply to
Larry Jaques

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