squirrel cage fan
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Fleet Mechanic
Joined: Sep 2002
Posts: 1,622
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From: okla
squirrel cage fan
I was recently given a squirrel cage and motor from a central heating unit that was replaced with a new one while upgrading to hvac. Allthough it worked fine prior to removal, I can not get it to work now. The fan shuts off immediatly, I assume the thermal switch is getting hot since once it sets a few minutes, it restarts. The fans spins freely in the housing. The motor runs freely without the belt attached, once the belt is installed[from loose to tight] it will not run more than a few seconds. I would love to have this fan cooling my shop. Any ideas?
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Joined: Jun 2003
Posts: 439
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From: Burnsville, MN
squirrel cage fan
These types of fans require some degree of backpressure or they will overheat the standard motor. I have used these over time to cool my garage and dry damp rooms, but when it has been a belt drive unit - I have changed pulley sizes or motors. When they are the integral units - where the motor is the blower support, then I have had to put them in a box to alter the amount of air the blower attemps to move.
Hope you have a similar issue and that this help you out.
Hope you have a similar issue and that this help you out.
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Fleet Mechanic
Joined: Sep 2002
Posts: 1,622
Likes: 3
From: okla
squirrel cage fan
Thanks Bill, am I correct that I would use a larger pulley either on the motor or on the blower? Is a lack of backpressure allowing the motor to exceed it's rpm limit?
Senior User
Joined: Jun 2003
Posts: 439
Likes: 0
From: Burnsville, MN
squirrel cage fan
A larger pully on the blower or smaller on the motor, we need to increase it's torque to overcome the increased resistance of the blower due to it's new environment.
I think that you will find if you have an 'AMP-CLAMP' (AC ampmeter) that the motor is drawing in excess of it's rated amperage. You will need to select a pulley which will allow the motor to draw no more than it's rated amperage.
I think that you will find if you have an 'AMP-CLAMP' (AC ampmeter) that the motor is drawing in excess of it's rated amperage. You will need to select a pulley which will allow the motor to draw no more than it's rated amperage.
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