Does the motor say what class of insulation it has on a tag? Some can run quite
hot however I'm like you in that 190 degrees sounds like too much.
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On 6/25/06 at 10:16 AM Ken wrote:
>I recently refurbished a dual 4-1000A RF deck. It came with a WW Grainger
>blower # 4C445.
>The blower is rated at 495CFM @0.0sp and 265CFM @.8"sp. The blower motor
>runs extremely hot.
>An infrared thermometer reads 190 deg. F on the motor after about 30
>minutes, and tops off at that. I haven't
>found any temperature rise specs. for these shaded pole motors, but that
>sounds excessive to me. Off the amp, with no
>back pressure, temp. is only 145 deg. F. The two SK-510 sockets provide
>little area for a blower this size.
>I have tried to make an adjustable vent, to relieve some of the back
>pressure, but with little temperature change, and I would
>rather not save the blower to lose the two 4-1000A's. Looking through
>Grainger's catalog, and looking at
>other amp blower usage, I have found their # 4C443, 70CFM @0.0"sp, 45CFM@
>.5"sp. Do you think this would be
>acceptable? I am only driving these 4-1000A's to 1,500w output.
>Thanks for your input,
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