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Re: [Amps] Dual 4-1000A cooling question...

Subject: Re: [Amps] Dual 4-1000A cooling question...
From: "Will Matney" <>
Date: Sun, 25 Jun 2006 13:39:24 -0400
List-post: <>

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. 



*********** REPLY SEPARATOR  ***********

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,
>ken, wa4mnt
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