Help with reducing blower speed


  #1  
Old 06-15-12, 01:58 AM
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Help with reducing blower speed

Hello,
I have the Comfortmaker PS80 furnace, and would like to set the blower speed down to low from full speed. It would be greatly appreciated if you could provide any information.

Thanks,
Al
 
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Old 06-15-12, 11:31 AM
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The first thing is for you to determine if the blower motor has multiple speeds. If it is a direct drive motor you need to have various speed taps on the motor to change speed. If it happens to be a belt drive, then a pulley change may work.
 
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Old 06-15-12, 01:51 PM
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Most furnaces have 3-5 blower speeds - at the factory, high is wired for cooling, and medium low/high is is wired for heating.

Continuous fan mode uses either the heating or cooling speed - depends on the furnace.

Measure the temperature difference between the supply and return in heating mode prior to changing the speed. The temperature rise range should be on the nameplate.

Incorrectly setting the speeds can cause damage.
 
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Old 06-16-12, 07:33 AM
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Why do you want to change the speed? As Muggle stated changing speeds improperly can cause damage to equipment. When changing blower speeds tests need to be done after to be sure your system is within it's spec'd operating ranges on both heating and cooling.
 
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Old 06-16-12, 12:06 PM
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For cooling you can use the middle part of this chart - http://efficientcomfort.net/images/Chart1.jpg

Ability to measure wetbulb temp required.

For heating, check temperature rise.
 
 

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