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HVAC Blower Motor Class! PSC Motor Speeds, Colors, Ohms, Current, Shorts, Air Restrictions!
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- เผยแพร่เมื่อ 16 ส.ค. 2024
- In this HVAC Training Video, I show Furnace and Air Handler Blower Fan Motor Operation, Speeds, Wire Colors, Electrical Resistance Values on the Windings, How to Rest for Shorts, and How These PSC Blower Motors are Affected by Airflow Restrictions. PSC means Permanent Split Capacitor Motor. This Means that the Motor Requires a Capacitor to both Start and to Run. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
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⚠️ Disclaimer:
Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided.
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I had one of those “I was today years old” moments on the amp drop due to restricted air flow. Thanks for doing these!
thank you
Out of all the channels teaching heating and air conditioning, you have the very very best examples, explanation’s and detailed instructions. Your verbal tempo and rhythm are excellent. Some talk way too fast and mumble a bit leading to many many play backs. Not with you.
Thanks for your time and effort’s
I purchased the AC service book and it is great. Detailed explanations and great illustrations. I've been doing HVAC since I was 15 with my dad (I'm 45 now and am the owner/operator of my dad's business) and I've picked up a lot of great information from this guy.
You did an excellent job buddy! I retired after 48 years in the field starting from apprenticeship up to being a Maintenance Supervisor for many years and organized and ran our apprenticeship program for many years. Great life. Best of everything to you!
The most common issue service techs have when testing blower motor amperage in the field is leaving the blower door off. This will give an amperage that is out of spec and confuse a tech. And sadly, its used as a means to show a customer their motor is bad and sell them a new one. Better to plan on using a wire outside of blower compartment, even the plug wire can work by deducting inducer voltage from total if the heat is on.....Awesome video.
Craig, very well done on your explanation of blower motor diagnostics. Keep up the good work. I appreciate the effort you put into your videos. You are an excellent instructor.
Please do a video on checking inverter on split air con's, I'm old school analog caps and contacts. thank you love your explanations
You’re a very good teacher thanks for the videos they have helped me a lot throughout the years
I ALWAYS tell apprentices to take a picture of the wiring and all tags BEFORE mounting in the band, or just mounting in general.
Thanks for sharing. Tony from Houston
Absolutely amazing amount if exact information is a very short video. Great presentation!!
your video is very helpful way better than the school I went to. last week I received the book from amazon a bit expensive but that's fine . watching from United Arab Emirate (UAE)
Thank you Professor Mig. Seeing the higher ohm reading I would have thought it must be a higher speed. Key information. Need to go back and study my Ugly right? And now it makes more sense. Less resistance means more voltage delivered to the fan. TY
Just bought the paperback version of your Refrigerant Carving and Service. It is my new Bible
Thanks for the videos. I learn a lot from them 👍🏾👍🏾
The great thing about videos like this is the way they challenge preconceived notions. From your video I spring boarded into better understanding of how PSC motors allow variable speed. A standard formula to determine synchronous speed of a squirrel cage induction motor is to multiply 120 by 60, then divide by the number of poles in the motor. Most, including most shaded pole motors, have two poles. Am I correct to assume that the speed control of those extra windings is because the extra windings effectively create more poles in the stator, resulting in a slower synchronous speed? Is the slip % of slow speed significantly more for slow speed operation in PSC motors?
Good information on a plate. Thanks a million.
Awesome video, I am happy I bought your study material
I have a 1/2 HP,GE motor from my Rheem furnace (this is a spare motor) Its got 2 brown wires for the cap, a white wire which is the common and then black (which should make the motor spin the fastest) and it also has a blue, yellow and red wire. (red should make it turn the slowest)
Depending on which of the colored wires I pair with the white, I should get a different speed (RPM) out of the direct drive motor.
I hope to use this HVAC motor for another task but need to understand the RPM
So I set up my stop watch on my Iphone, I put a piece of tape on the shaft and set up my camera to record video which Im able to slow down to very low speeds so I could count the turns of the shaft.
It did not matter which wire I paired with the white wire, all of them made the motor spin the same speed (1200 RPM) which is faster than the rated speed on the motor label which is 1050 RPM.
After talking with a friend, he thinks it might be because Im free wheeling the motor with no load on it, (no impeller and no duct work)
Im stumped. Im not an electrical guy. All my engineering work is on the mechanical side of things.
Thank you very much and God bless you
simple you are the best . Thank you
Thank you Craig. This is very helpful. I love the videos!!!
Good video.
AC SERVICE TECH, ❤❤❤ BEST VIDEO INFORMATION ❤ THANK YOU VERY MUCH SIR FOR SHARING YOUR KNOWLEDGE 🇵🇭👍
Thanks Craig, I needed this...
Another good video; informative, tailored to learning.
Great video
It better than a regular TV!🤣
Thanks again for the videos!
🍺🍺🍺🥃🥃🎳⛳
Stay safe.
Retired (werk'n)keyboard super tech. Wear your safety glasses!
Great job man,
Very well explained class
Can you explain what was happening in the motor when air flow was blocked? Why got higher speed yet current went down? It was already at its highest set speed. Will motor be dead sooner when air flow is consistently blocked? Thank you
thanks, Craig for sharing! good stuff man.
1: 120v PS motor is easier to be burned out since it has higher current?
2: You showed the motor current is much lower when its air flow was blocked, which is good for motor since its current is much lower? In reality when insulation pad fell off and blocked the air flow it normally caused the motor to be burned out. Can you explain that? Thank you
240v is a lot less amperage than 120v, therefore less electricity usage. Good refresher course. Thanks👍
❤❤❤❤❤❤❤❤ thanks!!
Good info thanks for sharing.
Excelente great job thank you
Great tutorial, thanks! So now that we identified our speeds, how do we find out the RPM of each speed with out a rotation meter. The reason I ask is my motor at home on my condenser was an 860 RPM motor. I only had a 1075 two speed motor on the truck to replace it with. So naturally i put it in so my wife could have some air conditioning. I wired it to the low speed, but it still seems to be a bit too fast. I searched some for the answer to this, without much luck, any help would be great, thanks again.
What happens if all speeds are assembled and connected together at the same time?
Sir, I find it difficult to take out the blower motor out from blower wheel.Please do a video.
Were you adding a restriction or adding static pressure? A duct system will,add static pressure without adding a “restriction” but a PSC running without static pressure will over amp, get hot and shut down.....am I correct?
👍👍, thanks for sharing!
For instance in terms ohms law and watts law, you are reading 4 ohms and 10 amps with black wire that means there is 40 volts present and according to watts law that means there is 400 watts also! Can you reply about that?
Our tech support retired and I was kind thrown under the bus and put me doing service. I been watching your video's and learned quite of bit. This one of my problems diagnosing either raw board or motor was bad. I'm having little of issues working on mobile home electric furnace. Do you have any videos on them?
Here are a couple that he has.
th-cam.com/video/U7Tqk2Xh1Jw/w-d-xo.html
th-cam.com/video/7_-x6u9uzhU/w-d-xo.html
So does the resistance from the slower speeds come from the wire ? Might be a dumb question
I could just kick myself for incorrectly believing that an air restriction would cause an increased amp draw! Thank you!
How can this blower motor have so high amps?!! 8ish amps on a blower motor???
why double the voltage lower the amps? what is explanation behind the low voltage(120v) got move amps than high voltage(240v)? any one can explain me plese
SP one of the most important and out of spec. in the field costing $.
Hello. Thanks for your videos.
A question...if im checking resistence between any of the wires of the blower to ground, and i get a value differento to OL. What should do? Replace motor? Or what step?
So what wires are you using to test the wires resistance when you turning the blower on
Wish you had included demonstration of operation with a bad capacitor, open, shorted and wrong value. Otherwise excellent.
My motor says 1050 rpm. What does that mean the other two speeds are???? My motor label says 5Kcp39kg 1/2 HP
I have a blower as seen in video,if I run it without a restriction the amps are high,with some restriction the amps go down,how souuld I run blower for moving air in shop ?
What about on a ecm motor will the amps go up or down with restriction?
Craig, is there a way to tell if the blower motor is getting weak, like not blowing as hard as you think it should?
Also if you want the fan to always blow on high speed for everything, can you put a dual connector or y adapter on the black wire to both the heat and cool terminals?
Craig, had you blocked off the outlet would you also have lower currents?
Yes
If the outlet was blocked off you would read a higher amps. Because the motor is struggling to move that air forward. It reads lower when restricting the intake side because their is no air to move
MG, wrong. Blocking either the inlet or outlet results in the fan moving less air which means the motor is doing less work which equals lower current.
@Mackenzie Gray on a PSC motor your answer is wrong. On an ECM motor your answer is right. This video was on PSC.
Great video