Support- www.patreon.com/acservicetech Tool List- www.amazon.com/shop/acservicetech For those that are looking for the tools used in the videos: (Linked Below) UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ Magnet Jumpers- amzn.to/2PyKPQZ Alligator Jumpers- amzn.to/2PxqJXn Fieldpiece ST4 Dual Temp Meter amzn.to/2wc1ME3 Fieldpiece Bead K Type Temp Sensor amzn.to/2DBwKfs Fieldpiece Wet Bulb Temp Sensor amzn.to/2RRI7Tw Fieldpiece TC24 Temp Clamp amzn.to/2qHLyjZ Yellow Jacket Refrigerant Gauge Set amzn.to/2aenwTq Refrigerant hoses with valves amzn.to/2aBumVI Yellow Jacket Gauge set & hoses amzn.to/2vLVkV9 Yellow Jacket 4 Port Manifold w Hoses amzn.to/2BkuGIq FieldpieceSMAN360 Digital Manifold Set amzn.to/2BdoaD4 FieldpieceSMAN460 Digital Manifold Set amzn.to/2nB4Fe6 Compact Ball Valve for Refrigerant Hose amzn.to/2KUisW8 QuickDisconnect 90 for refrigerant hose amzn.to/2MMtVcg JB 6 CFM Vacuum Pump amzn.to/2nqbvo8 Appion Blue 3/8" to 1/4" Vacuum Hose amzn.to/2uYlVyc Appion Red 3/8" to 1/4" Vacuum Hose amzn.to/2uYg6Ro Appion Valve Core Removal Tool amzn.to/2uYr8WL Yellow Jacket 1/4" by 1/4" hose amzn.to/2umtcod CPS Vacuum Micron Gauge amzn.to/2v1nM3O Supco Vacuum Micron Gauge amzn.to/2v1JRiA RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn UEI DL389 Multimeter amzn.to/2xAdaJf Air Acetylene Torch setup amzn.to/2aQalsb 15% Silver Brazing Rods amzn.to/2gVLyLc Nitrogen Regulator amzn.to/2bXdR5f Nitrogen Flow Meter amzn.to/2brvoBg Other tool links can be found in the video description section. Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal- www.amazon.com/shop/acservicetech
@james770115 жыл бұрын
do u have a video for ohming out a compressor to find common, start and run?
@konnorwestley89643 жыл бұрын
Pro tip : you can watch movies at flixzone. I've been using it for watching all kinds of movies recently.
@karsynmayson36873 жыл бұрын
@Konnor Westley Yea, been using Flixzone for years myself :)
@osiel92036 жыл бұрын
You don’t know how much your helping me with your training videos. I have been doing hvac work for 2 years now. And I will be moving into doing more service work eventually. And your videos help me better understand the technical side. You are well appreciated.
@acservicetechchannel6 жыл бұрын
Thanks a lot OSee 96!
@johnjonz24726 жыл бұрын
I've learned a lot from AC service tech. Clear explanation and easy to follow. And now, I can see who's been helping me. Nice bro.
@acservicetechchannel6 жыл бұрын
Ha ha, thanks a lot John!
@johnjonz24726 жыл бұрын
@@acservicetechchannel . No problem. One quick question: Is it possible for a bad high limit switch to prevent the control board from sending 120 volts to the inducer motor?
@skitterlad4 жыл бұрын
That was great. Wonderfully displayed information. When consumers have to rely on companies like HomeServe to know what they are doing, videos like yours help us common folk understand better than the novice service tech. This way we are less likely to be cheated by ineptness when they say we need a whole new system.
@jollyscaria1922 Жыл бұрын
Vrey vrey impot point yes yes cotactd isidd eigzeing power not caching loos cotacting power not caching isside sprinv point s dust and power clen or good wsy replacing poperly yes
@alextoufanpur1212 Жыл бұрын
What a knowledgeable kind man you are! I enjoy learning from you immensely! Thank you my brother!
@gankstar20005 жыл бұрын
Well done; very informative! May God bless you and your family! Thanks for the video!
@acservicetechchannel5 жыл бұрын
May The Lord Bless You too, thanks!
@michaelvanwagenen1069 Жыл бұрын
THANK YOU!!! You just saved me $ as it was problem 3. In my case the fan was stuck running 24/7. I just cleaned it, and it runs perfectly.
@rj.parker6 жыл бұрын
Now if we can get AvE to show himself, all will be well in the universe. Your channel is certainly a great resource. Almost 60k subs in two years is pretty pretty good.
@acservicetechchannel6 жыл бұрын
Thanks RJParker!
@monsantofungaro57046 жыл бұрын
This channel is a wealth of knowledge and you explain things very well. Thank you!
@acservicetechchannel6 жыл бұрын
Thanks Monsanto!
@JeffLifeInReview3 жыл бұрын
One of the best videos I have seen!
@YTsux24-76 жыл бұрын
I once found a tiny piece of dried leaf nestled between the contacts on a no cooling dispatch. The wind had somehow blown it into the open style contact and that was the only problem. Great video sir!
@acservicetechchannel6 жыл бұрын
Ha ha nice!
@RayRay-nb7tn6 жыл бұрын
Great lesson on the contactor. Simple to understand and diagnose. Thank you for the video
@acservicetechchannel6 жыл бұрын
Thanks Ray Ray!
@sandraledger26123 жыл бұрын
You always do an exceptional presentation. Thanks!
@rickm7209 Жыл бұрын
This is a great video. Gets right to the point, lays out what you will learn and the explanations are very clear. One question - when the contactor is closed, why would I only get a 6v reading on the high side when it should be 96v (electric car conversion)?
@edwardrutkoski42014 жыл бұрын
This is a great tutorial -- if my blower fan stops -- then I tap it and it runs for a few days. I can actually bang the outside of my blower unit and then it turns back on. I bought a replacement but curious what you think is the issue.
@WilsonAutoworks4 жыл бұрын
Saved my family from melting LOL. Thank you for this video!
@richardhaen7 ай бұрын
Very good video, got a question can u replace a2 connector with a 1. Thanks
@davejohnsonnola27586 жыл бұрын
As always thanks for sharing. Good vid. One suggestion: while this demo was clearly a bench test of the component, a disclaimer on checking resistance across the contacts. Don't want the newbies trying that on a unit while power is attached. Perhaps instead, showing component testing demo while connected to a unit demonstrating worn contacts as a voltage drop across the power leads.
@acservicetechchannel6 жыл бұрын
I always try to teach testing of components with the power off instead of drawing full amps of the components for safety, thanks Dave!
@stuzman526 жыл бұрын
Nice to see the face behind the video! Another method that I use in the industry is to measure the voltage drop across each contact. Great video and keep up the good work. 😀👍
@acservicetechchannel6 жыл бұрын
Yes, the only reason I don't teach that way is that the tech is so close to the high amperage and I am used to teaching the trade to 15 year olds and up so playing it safe, thanks!
@stuzman526 жыл бұрын
@@acservicetechchannel No problem at all as I fully understand in teaching the younger folks with safety in mind. Have a great weekend!
@acservicetechchannel6 жыл бұрын
You too, thanks!
@adamochsner86722 жыл бұрын
1uyeyrryyar4g r h4 Eh by but ply
@toupscalvin6 жыл бұрын
When checking the resistance on the coil, what ohms value is acceptable. Love the vids and keep up the awesome work
@throttlebottle59066 жыл бұрын
it depends on the coil voltage rating, once you expand into other parts of HVAC and refrigeration the coils are not all 24 volt, you can have 120, 208/240, 277, 480v( not often you'll see 480v coils though)
@towqeerusmani90525 жыл бұрын
@Daniel Blanchard 6 to 20 Ohms is acceptable for almost most of the coils in single n double poles contactors i believe
@ColonelLucario Жыл бұрын
5:26 Exactly what I had at my job A contactor was not working and after investigating the coil wasn’t showing a value (1. On the multimeter which means infinity) But I don’t get something : The power supply is 3x lines + neutral + ground 380V Between the lines and the neutral it isn’t equal It must be 220V but it’s 170~ ish between L3 and N, 250 between L2 and N, 280 between L1 and N For the contactor what was used is L3 and N for the 220V working supply But it’s actually 170V that the coil gets Could it be burned because of that ? But it’s underpowered so how can the coil burn ? Anyway this video is really helpful and shows that even a tiny little thing (coil that is used as a switch) can have a lot of issues
@davewarren5243 Жыл бұрын
Hi I am your fan watching your tutorial most of them. Can I replace 2 pols contactor with coil only one side ( on the top of it ) to regular contactor have coil both side ?
@TheMajorKC6 жыл бұрын
Also seen a failing coil or bad supply voltage to the contractor cause a chatter with it not fully closing and blowing the low voltage fuse.
@acservicetechchannel6 жыл бұрын
Yup the chattering due to low voltage from resistance, thanks for adding that one!
@scottcrowley20612 ай бұрын
Just had this from a failed Trane air handler emergency heat contactor. Disconnected with 25 volts applied with variac makes a rapid vibration.It was 22 years old. Would occasionally blow the 5 amp control circuit fuse.
@gadshotmail4 жыл бұрын
Thanks a bunch. Fixed my jammed connectors. Got dirty. 😊
@acservicetechchannel4 жыл бұрын
Glad it helped
@acelookrenos6116 жыл бұрын
I do appreciate your technical helpfull knowledge sharing. Adorable Thnks from Australia
@acservicetechchannel6 жыл бұрын
Thanks Ace!
@OthmanAlikhan Жыл бұрын
Thanks for the video =) @AC Service Tech LLC Is pushing the magnetic contactor manual push bar while power is live a valid/common practice to test the contactor? I see this done quite commonly by the HVAC technicians who visit to fix residential HVAC problems where I live.
@waynegram8907 Жыл бұрын
ACSERVICETECH, How can you measure the FLA of the contactor? how would a technician know when the contactor has an FLA problem?
@russellroutt34482 жыл бұрын
My blower motor won't shut off when it reaches the right temperature would it hurt for me to spray electrical contact cleaner to see if it might free something up
@TG-ok4ty6 ай бұрын
I added a relay hard start kit. I switched from a single pole to a two pole contactor. I didn't realize the original contactor was a single pole with the other pole just shorted out. So basically, I have one pole that does not need to be switched. Should I tie the relay BEFORE or AFTER the contactor the pole that was originally shorted? Does it matter?
@hh-oq8gc11 ай бұрын
Do u know of any brand that offers contactors that are silent no clicking?
@user-hx5vh9uh2n Жыл бұрын
I had a breaker tripping to an ac unit today. I killed disconnect and then breaker reset. Found continuity on the 240 wires. Was Thinking I should replace capacitor but now after seeing this I’m thinking maybe contactor too. It’s a unit on roof could have water or spider webs . I didn’t check for control voltage on contactor and didn’t have a meter with capacitance with me. But did notice the contactor was pulled in when I did the continuity across is and from line to line also had continuity. Anyways I’m not that good at ac troubleshooting but looking for to trying again when I get some parts
@michaelcostello69913 жыл бұрын
So high amp draw on motor or solenoid coil could be due to the low voltage being supllied due to bad contactor or coroded terminals. Excellent. THANK YOU. Does the same theory apply to DC coils. Will they draw higher amps if voltage lower than design ???
@TheWilferch2 жыл бұрын
My odd question.....are DP contactors like used in HVAC systems here.....is the mounting orientation important?....can it be flipped upside down/right side up.....such that incoming L connection for line voltage can be either at top or bottom ???......just making sure.
@cyrilasfrenchyaz3 жыл бұрын
Great video, thank you! Also I believe under voltage from the thermostat may burned the contactor coil. I made the mistake to install a Nest thermostat with no C wire, just connected to the R wire for power, and even though the thermostat seemed to work and the condenser unit was working, after a few hours the condenser unit was short cycling. Changing the contactor worked for one day, I'm guessing less resistance so it worked all day until the day after, short cycling again. I pulled a C wire out of the air handler bundle cables and connected it to the thermostat and it has worked ever since, no more short cycling. When it's Summer in Arizona, you need AC ;o)
@michaelcostello69916 жыл бұрын
Very helpful summary of potential issues
@acservicetechchannel6 жыл бұрын
Thanks Michael!
@MB-xo6em Жыл бұрын
My contacts wont pull but the hvac guy said it’s because theres no freon in the system, will the contacts not pull do to no refrigerant?
@michaelcostello69916 жыл бұрын
Is there any videos on packaged units etc with multiple control boards and their wiring diagrams explained ? Any links appreciated on any type of system
@acservicetechchannel6 жыл бұрын
I don't have any videos going over the wiring of multiple control boards in package units, thanks
@nmannmanretfe93872 жыл бұрын
What`s the name on the ring at the openings of the ironcore?
@marlon84294 жыл бұрын
I remember watch this channel when I was in school and nothing made sense because I was so green now that I’ve been I The field for 4 years I’m like duh this is basic electrical 😂
@xxjuanchoxxhd8724 Жыл бұрын
Hey man I’m currently in my second semester of my first year and although all these electrical components like the contactors, relays, and etc etc are starting to slowly make more sense im having trouble fully grasping the electrical side of the job like reading schematics and understanding the sequence of operations of all the components I’m having more difficulty with and It worries me at times because it makes me question if I’ll actually be able to get it down when I go out in the field which will be in about a month. I will be starting my first apprenticeship job, do you think actually being out there working helps more then school to actually understand these things? Am I maybe worrying to much about it
@robjohnson6842 Жыл бұрын
@@xxjuanchoxxhd8724 Don't worry about. Just keep studying and learning. Getting out in the field and experiencing real world problems will help. Keep after it and you will get the hang of it. Don't get discouraged. Good luck!
@JA-vy1gp Жыл бұрын
Haha that’s y these videos are important man and salute to him for training tips on the newbies
@DS-fb9te Жыл бұрын
@@xxjuanchoxxhd8724we all go through same thing you are going through, never get discouraged sir. (Hope you doing better by now)
@jackkalos231 Жыл бұрын
Plunger is closed even with thermostat off so compressor always running, had to pull the fuses to stop it. But as soon as I unplug the low voltage wire (brown) from the side of the contactor the plunger immediately releases to off. Is this a case of bad thermostat?
@AaronHatcher2 жыл бұрын
What would cause the contactor to buzz when the cold on thermostat is on but the whole ac system is shut off at breaker? My house isn't cooling down but the fan is working. I'm not positive if the compressor is working or not cuz I can't tell by listening.....but line or pipe that has the insulation on it is dry and not very cool which ik it's supposed to be cold and have maybe some condensation on it. Do you think this would be because of the contactor buzzing thing or maybe it's the dual run capacitor? The capacitor doesn't look like it's bad but I don't have a multimeter to check it and I'm trying to fix this on my own cuz I'm very very tight on money right now. Thank you in advance for your advice
@sapphirescott48605 жыл бұрын
My old contactor is labeled L3 L1 T3 T1 and my new one is labeled L1 L2 T1 T2 how do I know what wires to put where
@michaelmarsico69102 жыл бұрын
Im an electrical apprentice and just ran into a bad pressure switch on my ac unit. I was reading 24v from the t stat through the switch. The coil wouldn’t pull in. I bypassed the switch and it pulled in.
@crxess3 жыл бұрын
Still looking for a solution to a Buzzing noise with AC unit off and Contactor contacts retracting properly.
@Redneckboy9914 жыл бұрын
I installed 3 brand new contactors. All paralleled together for heat tracing loads. Only one of them chatters. Why would a brand new contactor chatter?
@ericmartin69812 жыл бұрын
what about when you have power on both sides of the contactor even though 24v side has not pulled in the contactor? yes one pole will have power but the other one should not. Internal short? Dead Short? What's the difference between the two?
@williamwilkerson4224 Жыл бұрын
Your seeing 24 volts on both sides of the coil because the thermostat has contacts have not closed.if you take both wires off the coil you'll find only one wire has power.
@ccthepope6 жыл бұрын
wow, nice to see the face to match the voice!
@acservicetechchannel6 жыл бұрын
Ha ha, thanks R Aeronca!
@ultrafaga19476 жыл бұрын
I thought the same thing
@acservicetechchannel6 жыл бұрын
Thanks King Leonidas!
@rusosure72 жыл бұрын
Love your video! What is the resistance of the coil in the relay? Mine shows 0.000 ohms. Is that normal? It seems like a short to me.
@ytwu33582 жыл бұрын
I like to know that. I just bought a new one from Amazon but it's coil got zero ohm. I intend to replace an old one with zero ohm too.
@officerkrupke49662 жыл бұрын
Coil terminals are usually on the sides of contactor, right and left. The resistance of coil should be at least 15 ohms. Low voltage circuit, which is supplied by transformer in air handler inside house, is 24 to 28 volts, and is protected by a 3 or 5 amp fuse. From ohms law, we find that a coil with 15 ohms on a 24 volt circuit will draw 1.6 amps. If coil resistance gets below 5 ohms, fuse will blow.
@victorbaker4585 Жыл бұрын
Power Bill is very high. AC unit runs when the furnace comes on. I turned the power off going to the AC unit. I keep hearing a buzzing noise that sounds like it could be the contactor coil making the noise and why? What is happening?
@busdriver90072 жыл бұрын
how can I have 120v on all 4 wires and the contactor is not pull in ...and when I push in on the contactor the unit starts to run. ???? am I getting back feed.??? or what is the problem??
@Trendd-official4 жыл бұрын
Very good information...nice delivery
@acservicetechchannel4 жыл бұрын
Glad you liked it
@RayRay-nb7tn6 жыл бұрын
You are very welcome
@josheom2 жыл бұрын
Hi My Contactor was rinsed by water due to burst pipe. When I turn on the breaker it doesn’t turn it on but when I manually press the Contactor it still works. Do I still need to change this Contactor or I can run with manual pressed?
@teslamr73335 жыл бұрын
Great video. Would you recommend replacing a contactor if the terminal was rusted?
@acservicetechchannel5 жыл бұрын
They have brass connection points inside the contactor but if the tabs are rusted, certainly you could replace it with a like size one. They are cheap enough, thanks!
@matthewclifton86879 ай бұрын
What’s the issue? When you gotta push it in for your AC unit to kick on and when you let go it cuts off what could be the problem?
@NoNo-in5tu4 жыл бұрын
@5:22 would the coil read zero ohms if it was functioning properly?
@acservicetechchannel4 жыл бұрын
The coil will never read zero ohms, just the contacts, thanks!
@rusosure72 жыл бұрын
The relay I salvaged from a working air handler has 0.000 ohms on the coil. I wished to use it for a project of mine, but now I don't trust it. The little wires leading to the coil look pristine. Any idea why it would read 0 ohms?
@robertmatetich28984 жыл бұрын
How about symptoms. Do all of these problems cause failure, buzzing, arcing, etc?
@nuffdoggiggey41033 ай бұрын
I pushed the contactor because my fan or cold air is not working, I changed the capacitor, and it did not help, so yes I pushed it with a screw driver, it seems very sloppy, it's just Like the one on the vedio at the end, so when I decide to push hard to make contact it sparked, lol, yes power was on, my question is should it be sloppy, move back and forth in all directions? I've got to figure this out.
@mehtabhashmi20093 жыл бұрын
Thanks for the sharing
@Ghamam0r3 жыл бұрын
Thanks
@acservicetechchannel3 жыл бұрын
No problem
@elijahvee34305 жыл бұрын
Do you have any videos on low amp draw on compressors or diagnosing bad compressor valves ? If not can you make a video go over those things.
@acservicetechchannel5 жыл бұрын
Elijah, look up "acservicetech bad compressor valves" thanks
@fridgydownunder67346 жыл бұрын
Can you make video on area computation vs size of aircon unit (tonnages) thanks
@throttlebottle59066 жыл бұрын
good suggestion, but there's far more involved in sizing AC and heating than just the square footage. example, R value of insulation, windows, doors, solar gain, exhaust fans/makeup air, appliances, hot tubs, pools(indoor) and there's more yet ;)
@acservicetechchannel6 жыл бұрын
I would like to at some point in the future, thanks!
@fridgydownunder67346 жыл бұрын
throttle bottle absolutely👍🏽
@josetorres33552 жыл бұрын
Why if your reading high mega ohms on the contactor it should be replaced? sorry I didn't understand that part from an electrical perspective.
@williamwilkerson4224 Жыл бұрын
Because the resistance is going to limit the amount of current that can pass thru the contacts.
@mariobryant88035 жыл бұрын
Excellent points
@kimpliny4 жыл бұрын
Great video! I understand that you cannot reply to every question but I'd like to give it a shot see if I'm lucky still:). My A/C won't turn on. I checked and replaced the capacitor after finding it's defective. The A/C started running immediately. I left the house and turned the A/C off 2 hours later. A few days later when I turned on the A/C, it started but stopped about 10 minutes later (Not because it's reached the set temperature), then I turned it off. Next day I turned the A/C on to try and it won't start. (The Fan would run when I turned it from "Auto" to "On"). Can you tell what the chance is that the contactor was broken? Thanks!!
@officerkrupke49662 жыл бұрын
Thermostats are delicate creatures, very small manual switchs. Change the thermostat and make sure all connections are tight. Get one that is digital, and when you go out, dont move the switch to off, just set the pushbutton temp set point to a higher temp. Keep it simple.
@kimpliny2 жыл бұрын
@@officerkrupke4966 I had the thermostat replaced soon after my last post and it has been working fine since then. Yes, it's the thermostat! Thanks for the reply 🙂
@tarzansingh84362 жыл бұрын
Hi. 3A fuse inside furnance keeps blowing. Wiring tested ok for shorts. Can the low resistance of the contactor coil blow the fuse? Resistance of my contactor's coil is 15 ohms. Is that too low?
@deanmartin19666 жыл бұрын
Great info. Thanks for sharing
@acservicetechchannel6 жыл бұрын
Thanks Deanmartin1966!
@emperorsanders57443 жыл бұрын
My fuse keep on blowing. Next gave me E103 - over current on y1 error and I was able to change the contact. It worked one hour before same error . I put the ok’d thermostat and now it blow my fuse each time I turn it on. What can I do.
@soneeeee44404 жыл бұрын
great video. I've narrowed my problem down to what I think is contactor inside a trane air handler, 12 years old Trane 4TEE3F37B1000AA. at this time of year north east, we start heating with aux heat strips and outdoor heat pump cant function. for the first time, I'm hearing machine gun sound at the air handler when the aux heat cycle starts and ends, still getting heat and noise stops once it gets going. Someone mentioned could be corrosion from humidity and ac during the summer, might go away. Any recommendations. I have 20KW 4 x 5KW heating elements, 100A. I think these contactors typically are inside a separate metal box near the heating strips up where the breaker switches are on the front of the air handler if that makes sense? I've changed VS motor module before but haven't been up top where the elements are. All power is off when working on this
@allwayzangry82903 жыл бұрын
Electric is my weak point I want to build a practice board. But is there any way to get better at understanding what I'm looking at and figuring out where the problem is?
@ismailahmed80313 жыл бұрын
Nice work
@rosibelrodriguez33643 жыл бұрын
Ty 👍
@Polarcupcheck5 жыл бұрын
Do you find Square D contactors to be better than many others? I heard they are made in the U.S., but I would have to pay $38 to get one locally.
@acservicetechchannel5 жыл бұрын
Square D is one of the best for sure. They are usually less expensive at electrical supply houses but you would need an account thanks!
@Polarcupcheck5 жыл бұрын
@@acservicetechchannel All the electric supply house only had Square D in 120v coils. I wound up getting a Chinese made one Carrier sells for $6.00. I prefer to by U.S. made parts, but $38 was double the price of what that part normally goes for. In addition, the GE breaker I fried was originally made in Connecticut. The new GE one was made in Domincan Republic. The replacement went well. A 35 yo breaker and 25 yo contactor couldn't take it anymore.
@peymanamiri75602 жыл бұрын
Thanke a lot bro it was awesom for me.
@lanceescondido1914 жыл бұрын
Hi Graig, Thanks for posting informative videos. Most of my HVAC DIY are from your channel. Please keep up the great works. I have a strange issue with my HVAC: heating & fan only mode = no issue, cooling = issue/thermostat turns off (as if the power is lost) then turning back on (power cycling) On the cooling cycle, somehow, the thermostat randomly turn itself off (as if the power is lost) and then right back on. When the thermostat turns off, everything got shut down. This power cycling happen only about 40% - 50% of the time. After some Googling, I found that there might be something with the contactor on the out door unit. Is it possible for the faulty contactor to cause the power cycling at the thermostat? Please note that I don't have a floating switch on my in door unit, just a straight draining pipe down to the sink. The draining pipe looks dry, clear of blockage and there is visible no condensation on the drain pan. Also, I just changed my air filters a week ago.
@surujnarinepundit1372 жыл бұрын
Do you know why the contactor burns up, I replace two already in an AC unit, and can't figure out why it's doing it.
@officerkrupke49662 жыл бұрын
Check amp draw to compressor against nameplate rla. Check low voltage supply from transformer, should be 24 to 28 volts. Check all connections at contactor. They must be tight.
@conqueringlion42010 ай бұрын
Weird question but what’s the point of having these contactors, and if we get one that goes bad and we don’t have the replacement part but still need to keep equipment running can we just bypass “Hotwire” it or will a meltdown happen? Thx
@borshardsd7 ай бұрын
Not weird brudda. Relays allow us to control higher voltage with lower voltage. Imho these contractors allow our 24v thermostat control the outside condenser [in this context] which uses higher voltage to operate. Can you hot wire in an emergency? Why not. Be safe, isolate and get the new contactor asap. I'm guessing you would use the service disconnect to shut off the unit in this emergency?
@james770115 жыл бұрын
Great video 😀
@acservicetechchannel5 жыл бұрын
Thanks James!
@JS-xr9ri4 жыл бұрын
Does it matter which terminal the yellow and blue wires are connected to on the contactar?
@anhlee62203 жыл бұрын
if you are talking about the 24v Yellow & Blue, then NO
@officerkrupke49662 жыл бұрын
@@anhlee6220 If its a heat pump, you could disable defrost by switching wires, check wiring diagram.
@johncote27766 жыл бұрын
sometimes the little 5 or 10 or 15 amp fuses blows on the circuit board when that coil is bad
@acservicetechchannel6 жыл бұрын
Yeah, when it dead shorts together, thanks Blue Collar!
@jimbola776 жыл бұрын
hey, thanks, partner for sharing! I love all your videos! I am 48 is it too late to get into the field? thanks.
@acservicetechchannel6 жыл бұрын
No, I hear stories from service techs that transitioned into our field and are now on the top of their game. It is just a bit of a financial transition until they became more valuable due to knowledge and skill, doable though, thanks Jimbola77!
@wbquarles2 жыл бұрын
Good stuff. I've been having issues with trainees not understanding why the low voltage is not killed when the disconnect is turned off outside on a split system with a single transformer. Also have you thought about covering dual contactors and interlocked contractors on 2 speed units?
@l.r.trammell14373 жыл бұрын
I had the understanding you didn't read resistance with power connected to the load? What am I missing here?
@acservicetechchannel3 жыл бұрын
The contacts at the top do not touch the power down at the coil.
@l.r.trammell14373 жыл бұрын
@@acservicetechchannel I see. I'm taking electrical now at my local community college, so I'm still learning lol. thanks for the videos
@wildman86015 жыл бұрын
Btw the cap didn't look like any leak or bulge on it .... but was weird how when the safety on the pan was open and I'd push the contactor in n the condenser would run fan and compressor but when I drained pan and safety float closed n contactor pulled in the fan wouldn't run at all
@acservicetechchannel5 жыл бұрын
There could be a 5 minute delay if the outdoor unit had a control board or a delay module, thanks
@surujnarinepundit1372 жыл бұрын
Would the circuit board cause the contactor to burn up. I have replaced about three contactor on an ac unit, but the only thing I can come up with, that the circuit board is not sending the right voltage or the voltage keeps fluctuating up and down causing the contactor to burn out. Any idea of what it could be. Much appreciated
@officerkrupke49662 жыл бұрын
Check the low voltage supply to the contactor coil. Should be 24 to 28 volts ac. Check the amp draw to the compressor against the name plate rla. Make sure all wire connections are tight, this includes spade terminals on contactor.
@Texan10484 ай бұрын
What if ots a new contactor, gets voltage to close coil but will not do so? I have to manually push in the contact. The unit then runs fine and shuts off at set point. Rinse/repeat. 4 technicians have worked on it, either finding no issue, or the unit wont act up when they sre present. Aggrivating! This is an admin hallway and NO ONE can fix it!
@FireandFrostHVAC6 жыл бұрын
Good video, and now we all know what you look like... Thanks AC Service Tech.
@acservicetechchannel6 жыл бұрын
Ha ha, yeah a face for radio!
@somap83803 жыл бұрын
Thank you. 👍👏🏼👏🏾
@Eddy636 жыл бұрын
Another good vid ... Comments the young'uns show that your effort making these are really appreciated ... Good instructor ...
@acservicetechchannel6 жыл бұрын
Thanks Eddy!
@robertmunguia2505 жыл бұрын
You have the part number to the contractor with the cover please? Common problem down here south Texas.
@acservicetechchannel5 жыл бұрын
Hey Robert, here is the 2 pole 40fla- amzn.to/2NZCBxi -the single pole 40fla- amzn.to/2SYOlkp - and electronic contactor- amzn.to/2T3onwa
@GeorgeAlex-j6k Жыл бұрын
Very nice
@aliso-pv7ll6 жыл бұрын
Greg, Would you do a teach on the use of a run capacitor as a crankcase heater? Does the capacitor heat the crankcase? As always, thanks for your well presented and informative videos.
@acservicetechchannel6 жыл бұрын
Hey Aliso, you would use an additional strap on crankcase heater that is wired hot on the contactor before the n/o contacts to the 240v in the case of a heat pump, thanks!
@gregsworkshop25 жыл бұрын
Hey, I've got a 2 pole contactor for a Trane unit that has : 32 FLA 150 LRA , 50 RES but can't seem to find the correct size replacement part. I can find the 30/40 FLA but no 32 FLA. Any advice? Thanks
@acservicetechchannel5 жыл бұрын
Go with a higher fla like 40 and that will be good, thanks!
@BadWeatherfreak5 жыл бұрын
Do this contractors make a buzzing noise when going bad?
@acservicetechchannel5 жыл бұрын
They may, yes, but they do may a little noise even when they are new, thanks!
@wildman86015 жыл бұрын
What if the contactor pushes in when it gets 24 v but the fan doesnt turn on, but b4 the safety switch in the pan opened the circuit because the pan was filled w water once the water was drained the float was cutting on and off causing the condenser to go on n off several times when I went back down to the condenser the contactor was pulled in but the fan wasnt turning any more.... cap or contact are suspect , right ??
@acservicetechchannel5 жыл бұрын
There could be a 5 minute delay if the outdoor unit had a control board or a delay module, thanks
@johncote27766 жыл бұрын
Nice breakdown
@acservicetechchannel6 жыл бұрын
Thanks Blue Collar!
@FuegoBurns69696 жыл бұрын
Audio seems to be better great work
@acservicetechchannel6 жыл бұрын
Yeah, did some upgrades, thanks Jonathan!
@bernieclement33736 жыл бұрын
a few years ago unit had ant pile in front of unit and they were up in contacts so i just cleaned contacts and got it running and told them to take care of there ant problem. he called me to his house 3 times that summer for same problem, Should we take care of there ant problem lol.
@acservicetechchannel6 жыл бұрын
Ha ha, yeah in those circumstances we usually just replace the contactor with an enclosed one or electronic one like emerson puts out, thanks
@bernieclement33736 жыл бұрын
nothing wrong with contactor but i charged him each time you think he would get the hint @@acservicetechchannel
@anhlee62203 жыл бұрын
@@bernieclement3373 Money in your pocket, but Karma will be harsh. The guy did NOT get it, that is why he is calling you. It would be kind of you to tell the guy to kill the ants to prevent repeat. Also, the guy will hate you for having to call you back 2 more times. Short term gain....long term loss.
@ocsrc4 жыл бұрын
What if you have zero ohms across the 24 volt contacts ?
@anhlee62203 жыл бұрын
coil is bad, assuming you measure it correctly and the meter is ok
@hermansummers4876 ай бұрын
Why does my contactor drop out when high voltage is applied