How to Match a Furnace Motor | Spec. Sense

What replacement motor can I put in my furnace? In this episode of Spec. Sense, Vance explains what you'll need to find a matching motor. Finding a replacement motor includes matching the physical specs, electrical specs, and the direction of rotation. These specs are listed on the motor nameplate. You'll also learn why it's important to replace your motor capacitor when replacing your blower fan motor.

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00:00 Intro
00:35 Physical Specs
01:15 Electrical Specs
02:18 Capacitors
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[jessicalinder]

Hello! If all other specifications are equivalent on a replacement motor, are there any issues with a difference in body length and shaft length (replacement motor body and shaft length is 1" longer)?

[Ward-nlpt]

Thank you very much. Can you make Arabic one of the translation languages? This makes it easier for us to understand the topic

[Burnedtoastify]

Helpful video. If my current failing motor (Trane gas furnace) is a 1/3 HP with a 5uf capacitor does it matter if it gets replaced with a 1/2 HP and matching 10uf cap? All other specs are the same.

[crispinmiller]

What does the amp rating of the motor reflect -- that is, if two motors are equal in all their other specs (dimensions, voltage, rpm, # of speeds, hp rating) but you've found a new one with half the amp rating of the old one, will that work?? (as long as you give the new one the capacitor it calls for)? Or does the amp rating maybe reflect the weight of the blower wheel, so that a heavy wheel causes a more severe starting surge in the motor, so that the low-amp motor will overheat its windings trying to spin up the heavy wheel?