How to Replace a Condensing Fan Motor
Service calls about condensing fan motor failure are quite common. Even though fan motor replacement is a standard procedure for residential split systems, it requires careful attention to safety and detail.  This article will give you a step-by-step guide to replacing condensing fan motors. Along the way, we will also explain a few best practices […]
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Blowers, Props and How They Behave (or Misbehave)
Fan laws and fan curves are a deep subject with a lot of nuance and variation. Just to get our heads around the subject let's focus on two different types of fans that we see all the time in HVAC, the prop/axial type and the radial/centrifugal type. Centrifugal / Blower With a typical PSC blower […]
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Ball Bearing vs. Sleeve Bearing Motors
One aspect of motor selection that can get overlooked is motor bearings and it can have big consequences. Sleeve bearings are most common in residential and light commercial applications because they are less expensive and quieter. They don't have rolling “balls” but rather rely on a thin film of oil on metal sleeves. Sleeve bearings […]
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Aftermarket Motor Selection & Considerations
This article is written by technician and HVAC School community star Kenneth Casebier… Thanks Kenneth! When looking at replacing a single phase A/C motor with an aftermarket motor from your van, there’s a few things you should know and pay attention to. First, the factory OEM motor is always going to be the best option […]
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3 wire and 4 wire Condensing Fan Motor Connection
How to wire a condensing fan motor for 3 vs. 4 wires is a common question by new techs. Jesse Grandbois submitted this tech tip to help make it simple. Thanks, Jesse!. This is a quick one on the difference between wiring universal condenser fan motors and why brown+white is the same wire as white. This one […]
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Remove “Weep” Plugs on Motors
In this 60-second tech tip video by Brad Hicks with HVAC in SC. he shows us how and why to remove the weep port plugs on a condensing fan motor. I know from experience that motors can fail prematurely when this practice isn't followed. Remember that motor orientation dictates which are removed. It (generally) the ports […]
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