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Re: [Amps] Centrifugal Blowers

Subject: Re: [Amps] Centrifugal Blowers
From: Joe <>
Date: Thu, 27 Jan 2022 13:08:29 -0600
List-post: <>
On mine I have a light bulb in series with the blower, and if temp rises above a set point the bulb is by-passed.
Vary the wattage of the bulb till you get the desired speed.
Joe  WB9SBD / W9ET

On 1/27/2022 12:54 PM, Roger - W7TZ wrote:
I used to have a catalog that described how to slow blowers and it depended
on the type of motor. One type you can use a resistor in line, the other
type requires the use of an ac capacitor in-line.

73, Roger


On Thu, Jan 27, 2022 at 7:03 AM Byron Tatum<>  wrote:

Thanks Guys-    I appreciate all the suggestions on repairing my blowers.
The units I have are Kooltronics KBB47-5 with a motor #7162-0802. This
motor is 3400 RPM at 60 Hz. I am looking for a lower speed motor as this
blower is excessively noisy and I can get by with less airflow in SSB/CW
service. I need to stay with my existing housings as I cannot find any
replacements that have same bolt hole pattern (2-5/8" square) or flange
dimensions (3-1/4" square).    What happens to these motors if I reduce the
voltage to slow them? Or, do they work this way, in other words is the
frequency of AC what should be varied? Say I was to lower AC voltage to 60
or 70 VAC, will the motor be negatively affected?Thanks,Byron W5FH
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