Bryan is back with basics of Common, Start and Run as it relates to Single Phase PSC motors. Read all the tech tips, take the quizzes and find our handy calculators at www.hvacrschool.com
Almost 15 years now doing this stuff everyday and i cant stop watching these videos. Amazingly accurate and necessary information for basic and in depth problem solving.
Bryan, Thank you, your video instruction is very clear and informative. You are an excellent instructor given you don't assume any prior knowledge on the part of the viewer. Also - you stick to business - no fluff (i.e. like listening to yourself talk), no annoying music etc. Excellent instruction all the way! I subscribed and look forward to learning from your other videos. Thanks so much! ps thanks for the outstanding illustrations - very helpful for visual learners.
Nice video. I knew all of this, but it took me a lot of brain racking to figure it out on my own. This is one of those things that some guys work around for years and years and never understand it. Awesome crash course for clarification/learning and very applicable.
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Question for you, in the UK our compressor wires go straight to the printed circuit. I am new to the industry i want to learn and do well. As testing goes do I just wires from my board to compressor like you would do if you had capacitor?
This video for clicked with me to create what I suppose is the "story", which is how I remember things. I'm terrible with remembering random things not tied to their reason. So the story goes like this: The run and start/aux windings on a motor must be connected to the same leg of power as they must be in phase with each other. The start/aux winding is then shifted in phase compared to the run winding by connecting the start and/or run capacitor in series with the start/aux winding to create a residual force between the windings' magnetic fields that gets the motor turning, and for the run capacitor after start up to also "tune" the motor for the most efficiency at the design load. Common (C) on any component is almost always localized to that component and has no relation to (C) on any other component. For instance, power from the same leg as the run winding is pigtailed to the (C) terminal on a dual capacitor where it is forked to both the compressor motor via (HERM) and the fan motor via (FAN) terminals. Whereas the (C) terminal on a motor is where the run and start/aux windings are tied (commoned) together to connect to the opposite leg of power to create a complete circuit with the line power. Going back to the first "rule", when using a dual capacitor both motors (compressor and fan) run windings are connected to the same leg of power since their start/aux windings are also connected to that leg of power via the dual capacitor (C) terminal.
Don't complicate it. You're completing a circuit, simple as that. The start windings are shifted out of phase with the main windings due to being run through a capacitor, this gives you the torque to get the motor running and in the correct direction. After that point they just provide extra emf at a different angle as the squirrel cage rotates but the main windings provide the real torque when they are pulsating. If you hook common wire of motor to C on capacitor and then the start winding on Herm (or fan if talking fan motor) then nothing would happen with Run going to contactor as there is no circuit. If you hook L2 up to the capacitor then you'd have a circuit but it might act funky because it has to loop power both main winding and start winding common through the capacitor to get back and forth from L2. Im guessing heating issues and possible rotational issues and capacitor issues if it ran at all. Needless to say, motor run goes to T1 as does C on capacitor and motor common to T2 assuming the hookup of the contactor correctly. Start goes to Herm. (Or fan if condenser fan) pretty easy.
my cpf sir is 8 layers sir but the problem is 5 6 7 layers cannot cooke the fish.how to adjust the txv.if i cant adjust.in what direction.thank you sir
I really enjoyed this video. Question. I have a tempstar 3 ton 1 phase home A/C unit. Looking at the compressor wire set up, it shows R - Red wire, C - Black wire, S - Blue wire. The blue goes to the start or HERM of the dual capacitor. The black is common wire, and red wire is the run. If I want to test the total inrush, which wire should I clamp my meter onto? Also, do u know where I can find the wiring diagram? Mine washed out. Model # TCA236AKC4, S# E052050914. Thanks. I hope u can help. John.
What would happen if capacitor C is connected to same leg as compressor C. Less torque at start right because it still comes with phase shift from capacitor. Thanks for sharing
Common is the path back to power source. So if you hook that up to C, with R hooked to T1 and S to Herm... nothing would happen. You dont have a circuit. If you introduce T2 to the capacitor then you'd have a circuit, possibly (Herm and Fan aren't connected so if you put it on the opposite, no circuit. Put on C then you have a path to and from source.) The problem is you'd be phase shifting both windings, it might run backwards, it may not have the correct torque to start at all if they're both shifting the same. Im not sure without testing, I have a sacrificial motor here... needless to say it would NOT be operating correctly and probably shorten the life of windings or hopefully capacitor first.
Regarding resistance values in 'Condenser FAN motors' resistance across the run winding will typically be higher than across the start winding. Check it out - its real
Only if you run the motor backwards... which it really shouldn't as the run windings are thicker gauge, which means lower resistance and less heat. The start winding typically don't fall out of the circuit on these motors. I just tested three. C TO R is lowest, C to S is middle, R to S is highest resistance just as it should be on any motor.
@@etherealrose2139 You would think so - and that is the way I used to teach it. If you do reverse S and R the motor will run backwards as you say but - I have a lab of about 16 different systems, all 2 ton, (lennox, york, etc) - few years back had my students identify the condenser fan motor C, S, R with the ohmmeter and wire things up only to find them all running backwards - after scolding each I found it was I who was mistaken. Each condenser fan motor had higher R winding resistance than S winding. My systems are all 2016 and newer so not sure if the ones you were checking are newer or older. I would be interested in what model you are testing - I could give you some of what I am testing. Best
Quick question I can't get a straight answer from anyone on this topic. Your thoughts would be greatly appreciated. Why when measuring voltage at a running compressor is there higher voltage than the input voltage?
So there is three pins right. You would connect the red phase to the common. Then the yellow phase to the start and the blue phase to the run pin. Then switch on
Just a little confusing if you look at schematic/ drawing around 1:05 and then drawing at 4:15. You have L1 going to motor run at 1:05 then at 4:15 you have L1 going to motor common. Possible confusion if the new tech doesn’t completely understand 220 single phase as the common side of the capacitor an be loaded from either side of the motor starter/relay contactor as well common and run Otherwise, as always, a very nice video
Melvin292 - as with most contractors, there is line voltage in so, yes. T1, T2 is the opposing side of the relay. I’m sure just simplified for demonstration purposes here in this video
Sir please make a video on the basis of Outdoor Heat pump AQUANEXA any model of ANX-09, ANX-15, ANX-35, ANX-50, ANX-75 , please sir working of it and how it delivers hot water from ambient temperature along with Heat exchanger , Compressor, 4way valve , fan , condenser fins and it's PCB connect sequence of capacitor of single phase motor and conductor for 3phase motor, please 🙏 sir Using R410a refigerant
Bryan singal phàse motor fowerd reverse connection on both way starting winding get line supply with the running capacitor on this time current flow in (centrifugal switch off) both the coil one left to right other right to left is it not harmful to motor I am a Bigginer for the motor rewinding phàse Ripley me
