HVAC CONTACTOR Operation, Types, Ratings, Problems, Testing!

[@uss.destroyer6975]

This man is the goat of HVAC/R

[@treywilson4310]

Yes he is

[@westonwatts6606]

Yes

[@paulrozinski1488]

Another great video, Craig. Between you, Bryan and Ty, the homeowner and techs have a great arsenal of information to make informed decisions. Thanks for being there.

[@acservicetechchannel]

I'm thrilled to hear that you find our content valuable! Thank you for watching our content!

[@corruptedbrain6]

even after i graduated back in may, i still rewatch and review my notes after work or on weekends. never stop learning

[@henrykennedy1120]

Im master licensed , certified for 45 years this is what every helper knows

[@carloszamora3337]

Electrical apprentice and this is by far of the best examples of contractors I ended up on the other side of the KZbin pond and found myself at a HVAC channel right on guys 👍🏼

[@betomedina2485]

I was looking for This video last night, life saver on my way to a service call right now where the contractor might be the issue

[@vicc504444]

You the man ! Couple of years in the trade and your videos have helped me a lot thank you

[@L8NiteCoffeeSips]

Love your dedication to teaching! Thank you Craig!

[@torinbrown8196]

Thank you for learning me more❤. Mechanic learning electrical here.

[@bodegadiescast305]

Excellent video will show it to my technicians. Wanted to add that something I've found many times is the contactor blowing the fuse at the air handler when calling for cooling. When that happens usually de resistance of the contactor is like between 1-7 ohms. Ohms should read between 9-17 most of the times.

[@atticrat7270]

Yeah, was disappointed he didn't show more of that.. these contactor coils are causing problems these days, with shorts. You ohm out the coil and it's generally around 1 or so, a lot of techs don't know about to do that.

[@jpenn727]

Another great video. Thanks for showing the drop/diff in voltage across the contacts. You must have a team of techs just looking for bad parts to bring you for future videos.

[@jortega222]

I wanted to add, the details shown in the video is excellent and gives greater understanding of the electrical components of the HVAC system. Please sir if you would I like more information on the electrical components in your future post and thank your time and teaching

[@acservicetechchannel]

Thanks for sharing & we will take your request to heart!

[@mikefrancis8614]

I really appreciate the knowledge good sir, trying to master my craft and you make it easy to follow along which isnt always the easiet task for me

[@HVACTEXH]

Awesome video man! I always refer new Techs to your channel. You are the best!

[@MaMa-qh4dy]

Very thorough and well-done! Many thanks!

[@acservicetechchannel]

Glad you enjoyed it!

[@marcosylvia5704]

Great video Craig. I always look forward to your teaching. Thank you.

[@acservicetechchannel]

I'm glad you enjoyed our video! Thank you for watching!

[@grahamblack4]

Thank you for all your knowledge and sharing it with everyone!!!

[@chesstime356]

As always I like your videos your one of the best technician….

[@acservicetechchannel]

Thanks for watching & supporting us!

[@zahedaminullah6934]

Well explained, good job Craig!

[@hidayat2798]

Thank you for the video about contector

[@Iqbalsinghbanga]

Very informative THANK YOU

[@bobrebera494]

very informative every time👍

[@acservicetechchannel]

Thank you for watching!

[@jortega222]

Excellent video, thank you sir!

[@acservicetechchannel]

Glad it was helpful!

[@henrykennedy1120]

No im the goat in hvac you learn this when you go to school basic hvac101

[@jimw7043]

Great Video. Is there a reason contactors cannot be sanded or chemically cleaned? Can it be a short-term solution maybe?

[@jefferylusk2550]

Informative and easy to understand.

[@acservicetechchannel]

Glad you liked it!

[@Mudcat597]

Good info! Thanks for sharing 👍

[@monsifsaidi2874]

Great video, thank you sir

[@tommysonboafor1325]

Very good ...watching you from Gh

[@SalahDambo-gb6cs]

)ربي زدني علمآ)May God increase me in knowledge

[@rickyrichy5496]

I love these videos

[@dancupryk9661]

My outside a/c unit fan runs constantly whether the compressor is on or off, and when off, the fan runs at a slower speed. So the unit is still cooling, but when the compressor shurs off, the condenser fan still runs. Faulty contactor switch?

[@aquarianhealer]

Ok so I need to replace a C140A contacter any suggestions & link to buy? Pls & TY

[@baxrok2.]

When checking the coil resistance, Do you have to disconnect the two wires?

[@94OaxEm]

No .

[@baxrok2.]

@@94OaxEm Thanks!

[@jameskennett8666]

Amazing video 👍🏼

[@acservicetechchannel]

Thank you! 👍

[@jingchen9610]

very good thank you

[@richardvignola8000]

Thank you, great explanation. I have a single pole contactor, points are on the right, shunt is on the left. The replacement is the opposite. I'm figuring to keep the wiring correct I should put the new contactor upside down. Is that right? Thanks.

[@bernardocisneros4402]

It doesn't matter. It's just a switch. It's like installing a switch that powers a light in your home upside down. It will work just fine but it will be in the up position when the light is off and in the down position when the light is on. Same with the coil terminals on the contactor. You can reverse the leads on that too and the coil will still energige.

[@userok209]

very informative. thank you very much.........free Palestine

[@cpmerze3285]

Thank you!!

[@ROCK-wi3es]

Thank you 👍

[@billshedd55]

What do the numbers, 11, 21, and 23 on the contactor represent?

[@mikhaelvargas5613]

What should be the resistance reading on the coil for a 2 pole and 3 pole Contactor ?

[@The1JBanks]

Thank you sir!

[@usphisics]

Where is the place to buy a AC contactor? My unit uses the hn51kc024 and I could not find it on Amazon

[@miked5798]

Should there be 24v on both sides?

[@Samlol23_drrich]

I just ask around when im looking to find a contractor.

[@Swainky]

why do i have 2 contactors on my heat strips versus the one i see on most modern package units today? one is ahead of the strips before it gets to the dual post sequencer and the other is after they pass through the strips before it returns and completes the current and i also do not have any safety thermal disconnects. it also seems to have came that way. is this common?

[@richardshandross3453]

At 12:07 or so, you measured 6V of voltage drop - but the blower side of the contact is not connected to anything. So, there must be an internal short somewhere between the input and output connections, because you can only get a voltage drop across the resistance of the pitted contacts if there is current flowing and no current would flow without there being a short. Not sure what path that short could possibly take - do you have any thoughts on that? Great video, thanks!

[@bernardocisneros4402]

There has to be a short because you can't have VD without current flow.

[@jeanlouisojdj]

Nice

[@sly5855]

On the voltage drop test, what do i need to set my meter to? I keep seeing 120v?

[@bernardocisneros4402]

On the voltage drop test, you set your meter to Volts AC. Place one voltmeter probe on L1 and the other probe on T1. You have to turn on the unit to see the voltage drop because there has to be current flow in order to have voltage drop. The reason you're seing 120V is because the contactor is not energized and there's 120V on the L side and 0V on the T side. The voltmeter measures the difference in voltage between its 2 probes.

[@sly5855]

​@@bernardocisneros4402 aha, thank you

[@bernardocisneros4402]

@@sly5855 You're welcome

[@eric01406]

Wow. Even a little voltage drop or resistance could mess up your contactors.

[@TomasRinc]

My max current rating on my outdoor unit says 30amp.. and the contactor that was in it already was a 25FLA, which it burned… does this mean whoever put replaced the contactor before used a wrong one? It should’ve been 30FLA or 35FLA?

[@bernardocisneros4402]

You're 100% correct. The person that installed it probably didn't have a 30 or higher only 25, so he said "25 FLA it is"

[@NeilPho]

The voltage drop across the contacts is not convincing. You need current flowing to really demonstrate the problem. Using Low-Z on the meter may well have brought the apparent voltage drop down to zero given there was no current flow through the contacts. Also it would have been worth pointing out the first contactor had one permanently connected pole in addition to the single switched pole (sometimes called a shunt or one and a half poles)

[@Balticblue93]

I definitely agree with everything you said there, but for us seasoned technicians, we already knew that. But for those that learning, that would have been the better way to explain it.

[@bernardocisneros4402]

Why do some contactors have terminals numbered L1,L2, T1, T2 while others have 11,21,23.23?

[@abdalqadr1]

❤❤❤❤❤

[@mrgreen9086]

How close to LRA rating could a load be allowed to run without potential problems

[@maness2112]

Should be at RLA

[@mrgreen9086]

@@maness2112 my wording here was wrong. What I meant to say is how close to LRA on startup would a load like a compressor be too high. For example I got 102 inrush amps with a LRA of 105 on a compressor

[@Balticblue93]

@@mrgreen9086 In that case, I would replace the contactor with a high LRA overhead and most likely install a hard start kit. 5-2-1 is the ideal hard start that I install, i don't do the two wire cheap units. But you are still within spec at 102 of 105 but I can't see I see many LRA units as low as 105. Usually, it is 150-200 for the models that I buy and install for my clients.

[@mikev.1034]

👍👍

[@AliMohamadi-t4o]

OK

[@teamdrummond6915]

LRA locked rotor amps: the rotor is "locked" and not rotating at all. Anything higher than the LRA, the contact will be rendered useless. (Burned up).

[@johnlovett8341]

Boo Yah!! Totally knows his shit, but doesn't talk shit.

[@SalahDambo-gb6cs]

،🐝🔧🥰💪

[@josephn.s5115]

Speaking in AMERICAN English ?

[@bernardocisneros4402]

Que?