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How to Adjust Belt Tension on Rooftop Units
Learn how to align the motor pully with the motor sheave and how to adjust the tension on the belt March 21, 2024
This video demonstrates the process of adjusting belt tension on rooftop units.
A first step is to align the blower pulley with the motor shaft to ensure proper functioning and prevent unnecessary strain on the system.
Next in the discussion are adjustable sheaves, which can alter the pitch of the belt and subsequently affect fan RPMs. Viewers will learn how to align the adjustable sheave with the blower pulley. Once aligned, the Allen screws securing the pulleys are tightened to maintain alignment.
Determining the deflection rate of the belt is crucial for optimal performance. By using a belt tensioner and performing some calculations, technicians can find the deflection force and set the tension accordingly.
To check the tension, placing the belt on the pulleys and using a straight edge will measure the deflection force. If the deflection is too tight or too loose, adjustments are made by raising or lowering the motor using bolts and nuts. If the belt is too tight, the motor is raised slightly, while if it's too loose, the motor is lowered to achieve the desired tension.
Throughout the process, safety is a priority, especially when working with machinery and electrical components.
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Neil Stoeger is a contributor with Slipstream.
