How to Match an HVAC Motor (In-Depth Guide) | Spec. Sense

What motor should I put in my furnace or air conditioner? In this episode of Spec. Sense, Vance explains what specifications you'll need to find a matching motor. This is a detailed guide and will offer a breakdown of each specification.

Finding a replacement HVAC motor includes matching the physical specs, electrical specs, speed and the direction of rotation. You'll also learn why its important to replace your motor capacitor and learn what ratings to match on the capacitor.

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00:00 Intro
00:35 Physical Specs
02:30 Electrical Specs
03:44 Motor Speed
05:03 Direction of Rotation
05:42 Motor Type
06:21 Capacitor
07:35 Enclosure

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[ichigohollowmask]

You have no idea how helpful this video is. I have a Taylor ice cream machine with a blower fan that is hard to find an exact replacement for and this video's content was extremely helpful in figuring out how to find a replacement.

[guevarraernesto]

This guy is amazing! Thank you so much for the knowledge, it is very hard to get straight answers from the techs, , none will give you any information so that you don't fix anything yourself. Thanks again!

[gary-jamescallaghan]

at 5:30, the CWLE ¸= CCWSE illustration saved my day !

[haroldlanglois]

One of the most if not the most informative and complete instruction videos I have studied. awesome, thank you for provide this outstanding information.

[shieldcracker]

This is one of the best technical instruction videos I have seen in you tube. Great content, graphics, AV, and production value.
You stated that the nameplate AMPS on a multi-speed motor is taken when the motor is running on its highest speed, if the same motor has dual voltage rating (208/230V) and a single value amp rating, at what and speed and voltage is this AMPS value recorded?

[srushtqadir]

It’s really useful. but I need more information about CCW and CW rotation how you can change. thanks

[Abo_Moussa]

What happens if all speeds are assembled and connected together at the same time?

[bigjrm]

So informative - thank you! Can I take the concepts learned here (matching the physical and electrical specs) to select an ECM motor to replace my PSC motor in my outdoor condenser unit? If not, how can I find an ECM motor that will be compatible with my unit?

[daves]

Great video and informative. Last year I replaced my air handle blower motor on my heat pump system. Since then the airflow from the vents seems weaker than it should be and it has to run longer to cool my home. The original motor was 1/4hp 1075rpm 2.1fla 208/230v. The replacement matches all of this except for being only 1.6fla. My erroneous thinking was that this was just a more efficient motor, but based on the video I'm thinking the lower amperage (almost 25% less) is equaling less output from the motor and in turn less airflow. Do you think this is a likely cause?

[dg]

Fantastic video! If the label on the old motor has worn away is there a good way to find the factory specs for the replacement based on the evaporator itself?

[Marc_B.]

1st time motor buyer here. Trying to match my old Emerson K55HXCEP-6404 blower motor. I found a Goodman 5KCP39FGV064AS # 3S008. But, few things don't match just right. Mine has 6.5amps, but the Goodman is 5.1amps.  My shaft is 4", but Goodman is 3.5".  Also, if I'm measuring mine correctly, my removable belly band is bolted on at 12" diameter, but Goodman max diameter is 10", and the bracket looks welded on the motor body.  There must a be a workaround for that, right? So, I maybe the Goodman might work with some guidance. I'm also considering buying the exact OEM replacement. An OEM for my 26 year old unit seems a little too good to be true even though it costs $100 more. Both motors are advertised online. Any guidance is much appreciated!

[stevengao]

thanks for this wonderful video, on my opinion i think Amps and HorsePower do not need to match original motor, it can be little higher (not lower), should be fine. but RPM and Voltage must match, what do you think ?

[russelleaves]

The one he put in is part number 0131M00010PS but it is supposed to take 11091202S both Goodman blower motors but for different models.

[ivanhernandez]

What would the consequence be of installing a motor with higher rpm??

[comedeyClips]

My old motor is a 10 amp but the new one is 7.3 amps is that fine? I cant find a 10 amp version

[curtiskiolbassa]

Great video taught me a lot but I was curious about the amps or rpm’s, I am currently torn between 2 different motors they are the right size as my old one but one is a 6.4 a while my old one is 5.2 a while the other has the same amps but the rpm’s is 1050 instead 1075… which would you say is better to go with?

[UltraHydrophobiccoat]

How a multi-hosepower motor wired inside of the motor? Thanks

[tm]

can i use 1075 rpm instead as a 850 rpm motor if all the other specs are the same?

[pukeschannel]

Never heard of an "underloaded" motor overheating? (But what do I know) And I've never heard of an underloaded motor drawing more amps than are listed (which would change it's efficiency) . If anything, doesn't it often draw a tiny bit lower amperage? And as far as efficiency goes. It might change the efficiency of your overall system, ..but the motor itself, if oversized, usually draws the amperage listed on the nameplate. Am I missing something? Maybe I am. Thanks for the video.

[sportsman]

I know you said to at least match the hp and amps. Will you please elaborate on why a replacement motor with the same hp same rpm but less amp draw is a big deal I’m trying to wrap my head around it thank you for your time.