How an Air Handler & Heat Pump Work & are Controlled by 24v Thermostat Wires!
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- Опубликовано: 3 июл 2020
- In this HVAC Video, I Explain How a Heat Pump and Air Handler are Wired and Controlled with a 24-volt Thermostat and Low Voltage Power Wires. I Show each Control Board, Relay, Switch, and other Component and how each Play a Role in Operation! 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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How can I get a work book?
you prolly dont give a shit but does any of you know of a tool to get back into an instagram account??
I was dumb forgot the password. I love any tips you can offer me.
@Reyansh Dario Instablaster =)
@Jonathan Phoenix I really appreciate your reply. I found the site through google and im waiting for the hacking stuff atm.
Seems to take a while so I will get back to you later when my account password hopefully is recovered.
@Jonathan Phoenix It did the trick and I finally got access to my account again. Im so happy:D
Thank you so much you saved my account :D
Nobody teaches this kind of work with so much detail as you do, sir; you are awesome.
If you ever wanted to do these videos in Spanish just let me know as I could be of help in the translation process.
Have a great weekend!
Craig as always you do an outstanding job of explanation. I was forced to figure this stuff out on my own 35 years ago. Your are a valuable resource to the training in this industry. Thank you for all you do.
100% agree. I have been struggling with this, and now I got it all
I am an electrical contractor. I have specialized in controls for many years now but I never worked in HVAC controls. Lately I have been installing home genetators and needed to know how the heat strips worked so I could interrupt them under certain conditions during generator power. I appreciate this thorough review of the split unit. I feel more confident now that I have had this overview. Thank you for posting.
Thank you for making this video. I'm not an hvac tech, but I do enjoy repairing my own stuff. I've been stuck for about a week now and its mid August in the deep south. Its humid and its almost 99 outside today, and this ac has been down for almost 3 weeks, so I was motivated to get this thing fixed, which I finally got everything wired up correctly this evening, thanks to this video. There are no other videos who show how exactly these Carrier heat pumps are wired. Again, thank you for making this video, its exactly what I needed. RUclips University comes thru again.
I hope you see all the people praising you for this video and others. You were meant to teach. Probably anything, you break everything down to fractions and explain it thoroughly and efficiently. I work industrial maintenance and wish I could find videos like you produce for anything I work on lol
Man, I love your video!! I took HVAC for 2 years at my local college and they really did not explain it to me as well as u have in 19 minutes of your video, now, not saying they did not do a good job in teaching me but I feel like they only taught me the very minimal basics on HVAC. Very pleased with your video and I wish I could have had this training in school, thank you again!
Watched a lot of HVAC guys on YT. Hands down, you’re the best 👍🏻👍🏻 You were built to teach.
Wow, thanks!
@@acservicetechchannel Yeah, man.I’m not blowing smoke. You’re on a different level. 99% of my work is CW/HW system with BAS.
All I can say is, you are awesome. Having thermostat issues. These videos are excellent!!! Thank you
I have to say this is the most comprehensive video I have seen. No more wasted time watching some yo yo babbling on. This man knows his stuff. I had a HVAC cert in FL but we didn't do heating. I put in a new heat pump and redid all the wiring. Honeywell 9000 thermostat. Have been having problems with this heating since it was installed. ODT has me messed up. This showed the correct wiring and that will solve my problem. Last tech that worked on my system while I lived in FL (this home is in SC) messed up the wiring and cut and spliced things up to where I wasn't sure what was correct. Now this video has solved that issue. One wire was in the wrong place and had disabled my Aux/E from working properly. Thanks for you awesome knowledge and help.
Fantastic!! Thank you so much for helping to educate this homeowner👍
Our pleasure!
Best video explanation that I have seen for both wire runs and control. Thank you for sharing.
Wow, thanks!
Love your videos sir.Invaluable for people learning online,thank you!
Impressively complete discussion! Thanks.
Love the way you described everything.
Awesome, thanks Ali!
Thanks for sharing all your knowledge with us ! Keep it up!
So nice of you
This dude is a Hvac beast! Learned a lot from him
Just incredible. Thank you for making this video.
You explain things great i went through an hvac class at a tech school back in 2010 got in a bad wreck leaving my first job interview,hit by a semi truck. I got the job but couldn't work. I eventually got a better job doing maintenence at a large building but they don't let us do much they contract everything out we just monitor everything diagnosed some stuff then they call in subcontractors for the work mainly for liability purposes. So I already don't get to apply the things I learned a lot if you don't lose it you forget it. Well last year on new years eve I found out I had lung cancer I am only 37 the chemo really messed with my memory even further and I find myself having and even harder time remembering things as far.as the sequence of operations and I get confused real easy so ita nice to have you videos to refresh when I do work on a family members unit or friends. I wish I ask questions sometimes though cause I always asked a lot of questions in class I think sometimes folks would be like on lets move on but i wanted to make sure I understood.
Thank You for the in depth explanation on this.
Outstanding performance and explanation !!!
Thank you!!!
Fantastic explanation !!! You have helped me so much growing in knowledge in HVAC . Thanks 🙏 thanks 🙏 thank
You are most welcome
This was a VERY well explained video! Thank you very much. I have 15 years of install and always just had to follow diagrams for the wiring part. I am now a technician and have had to look up wiring HPs a few times. This finally set it in my mind... Now... Do duel fuel 😝 pretty please! Even though with this video now I understand how that would be best hooked up! Gas/propane furnace with HP and coil.
Great to hear Thank you for your support!
Such a helpful video! Thank you Craig!
Glad it was helpful!
Your videos have been very helpful. Thank you very much.
Glad you like them!
Excellent training. Thank you.!!
very clearly explained. Awesome job!
Glad it was helpful!
Good 1 Craig ... Very informative as usual ...
Glad you enjoyed it
Dude ur explanation is awesome easy to follow and understand. U r very thorough and clear and quick n precise with ur explanation.. U didn't missed a thing. Loved it.
Great job, possibly the best and most well informed vids I have ever seen..
Delroy, that is really awesome, thanks!
Awesome video! I learned a ton in less than 20 mins.
Glad you enjoyed it!
Love the way you talk so fast I was confused in the first couple mins and I'm no idiot.
Dude this video was stellar. As an apprentice this helps TREMENDOUSLY.
I am really glad it helped! Have you checked out our refrigerant charging and troubleshooting book? It is primarily on the refrigerant circuit and those components, thanks
@@acservicetechchannel Yup! I have almost finished reading it!
very good explanation of the basics of heat pump op
Heat pumps are just starting to become popular in my area in Canada. Your explanation really helps me to understand the processes involved.
It’s not quite as complicated to my brain anymore. 🙂
Thank you. I was just looking for a video explaining that
Glad I could help!
This is an outstanding video. Thanks
This guy is the truth!!!! Great video
Wow very helpfull vídeo
Gracias mr. Yo aprendo mucho con sus videos tengo poco tiempo en esta nueva profesión y no tengo mucha experiencia pero usted hace más fácil todo siga adelante con más vídeos muy agradecido!!!
Ya tengo su libro muy bueno !!! Saludos
Hat down for your effort. So well explained that anyone who work on similar system can really go trough easy. 👍👍👍
Glad it was helpful!
Great Video. Thank you for sharing . Happy Holiday and Weekend ^_^
Thank you! You too!
WOW again so impressed by your abilities to teach us very thoroughly🙏 thank u
I served 4 years in an apprenticeship in sheet metal local 36. 2002 graduated 2nd in my class with 98% overall grade average. They didn’t teach hvac-r, just sheet metal. Studied hard 2 weeks and took EPA test through Mainstream Engineering. I passed with a 98% Universal license. Your books have taught me more in 2 weeks than I learned in those 4 years of training and it’s easier to understand. I was a lay-out man but now I’m a new service tech. My hats off to you for the training and it cost me less money to boot! 4 years of training was over $10,000 in sheet metal!
Hands on training is more fun 🤩
SMWIA local 105 Los Angeles retiree here. Maybe you can help me? I have 27vac from my air handler through my thermostat to my heat pump outside. 27vac going into the circuit board, but nothing going to the contactor for the fan and pump. I can manually press the contactor in and the pump and fan come on. Any suggestions? BTW,, this is a Goodman Heat Pump.. LOL yeah I know.. throw it out and get a better one. I cant afford that right now, but someday. This is a 2014 model.
@@jmead2294 So power is going to your defrost board, but not coming out to the contactor? It could be in a high or low pressure lockout. Some boards have flashing LEDs that will give you a sequence to look-up. You can also disconnect the low/high pressure switches and check them for continuity (to see if they may be open, and if they are, then you've found the reason your board isn't powering the contactor.) If both switches have continuity (or you can check for OHMs,) if they read OL--OPEN LOOP, then they are either bad, or you have a refrigerant leak/blockage. You can also pull the pressure switch wires off the board and check them that way, may be easier.
If the pressure switches are good, then the board itself may be fried. It's not too uncommon for a board to die.
@@jmead2294Did you ever figure out your problem? I am having the same exact problem with my Goodman heat pump and was installed 10 years ago. No power going to contactor but from my troubleshooting I believe my pressure switches are good. Unit works when I press in contactor. There is a clicking sound from defrost board, I'm assuming when it tries to work and scarese every time and makes me jump especially when I'm trying to be careful and test the terminals lol. There has been a couple times during the past week while I was sitting in front of it watching videos on what to try next the the unit would kick on and run but once it shuts off, it doesn't kick back on like it should. The issue started a couple weeks ago when we had the real cold spell. I'm in TN and it stayed below 0 for almost a week. The unit did great all week. Had it set at 68 and the coldest it got in the house was 65 and I was happy with that. The last night of freezing temperatures around 11 pm I realized just the blower was blowing. It was warm air so I knew heat strips were working. Went out and checked unit and it has a couple inches of ice in the bottom but it had been there all week and the compressor had a gab between it and the ice so I knew the defrost had been working. Next day I checked it out better and took panel off and the defrost sensor on coil was frozen over and I hoped when it thawed it would be good but it wasn't. I then started checking wire connections and found the yellow wire from thermostat into unit was broken in the wire nut. Just assumed it was because it had been so cold and the thermostat wiring was here before unit was replaced 10 years ago. Connected it back and it worked. Patted myself on the back and closed it up. Tooted my horn too soon because it didn't start back up once it kicked off. Spent the next week in between the rain showers troubleshooting it. Once I figured out the pressure switches were good, I was somewhat relieved because I can figure out how to fix everything but those switches and Freon issues. Contactor, transformer, new thermostat wires, new capacitor on the way (cause not expensive and an extra one on hand is always good) I'm starting to think the problem is in the defrost board and that's how I ended up here. Will be going out in the morning and start troubleshooting it. Hopefully you got yours fixed and it sounds like we may have the same issue and the same heat pump. Any help would be appreciated!
Sheet Metal and HVAC are 2 different trades, my friend. Refrigiration is also another trade.
THANK YOU so much for making this so understandable!!! god bless you !!!
Glad it was helpful!
🤯are you an angel ?
You just allowed me to grow fast enough in my new job to keep my job... And chase my dream
That's awesome and glad to help Ricky! Make sure to check out the full length articles on our website as well at www.acservicetech.com thanks!
This video is the coldest break down I've seen NBS!
So helpful. Thank you so much!!!!!!
Appreciate for great explanation
Great info. Thanks Craig.
Glad it was helpful!
Great video very informative
Glad it was helpful!
Great video. Amazing!!
Im going to buy your book after this truly amazing 👍🏿👍🏿👍🏿💪🏿
I appreciate that!
Knocked it outta the park thanks for sharing...........😎
Thanks for watching
Thanks for the video =)
Great stuff man
Life. Saver. Thank you sir!
Glad it helped!
Thank you sow very much this video is a great starting base for me
Very nice video.
Thank you 😊
So nice of you
Would love a book from you on essential wiring and typical issues and troubleshooting. Probably a big ask, but you would kill it.
We are working on it presently but it certainly will take a while, thanks!
@@acservicetechchannel dude thank you! I will be sure to grab a copy for me and my coworkers!
Great video
Thanks for the visit
Great stuff
Phenomenal I like your book btw very helpful for young minds that didn’t get thought this stuff in highscjppl
Yeah, I hated highscjppl
Great video thankful for this video
Glad it was helpful!
Thank you very much well explained
Glad you liked it
Thanks for the video good info
You bet
good job very informative video.
thank you partner for sharing very well explained! happy fourth of July to you and your family! stay safe.
Thank you!! Hope you had a safe Holiday weekend!
Excellent video thank you
Glad you enjoyed it
Great video.
Glad you enjoyed it
well done thank you
Great explanation great channel
Glad you think so!
Very good
Your videos are very helpful. I have a question: I am trying to install a new Thermostat (RTH9585wf) and my HVAC does not have a control board (I watched your other video on systems without control boards). However, I was not able to do the rewiring and use the G wire to replace the C wire. All videos and also Honeywell guidelines assume that there is a control board. Do you have any suggestions for the systems without control board?
Wow sr another great video good explanation
Glad you liked it
Thank man that’s was great
Thank you sir
Good tropic
I love this channel
❤❤❤❤❤❤
Glad you enjoy it!
Craig--excellent tutorial! I have almost exactly the setup you describe, air handler/gas furnace inside, and heat pump outside. I'm curious why the yellow compressor wire from TStat to Heat Pump (compressor on, whether reversing valve is activated or not for cold/hot) also needs to go to the air handler....presumably, increase fan speed when the heat pump is running? Does the heat pump require a faster circulating fan speed indoors than, say, emergency heat using just the white wire to the air handler heater?
Very thorough and clearly explained. I have a Lennox heat pump system that has not been able to run the heat pump. The defrost board Y terminal seems to pull the thermostat's 24v signal to ground, effectively shorting it out. I checked the defrost board for continuity to ground on Y with no wire attached and it seems to be shorted. Is this something you've seen? Seems like the Y input on the board should not act like a ground. This system is only a little over a year old, with no corrosion issues. I'm thinking either the board is bad or maybe a pressure switch is grounding the circuit.
Fantastic
Great videos as always!! I have an older York heat pump system. I replaced the thermostat recently, when unit is calling for heat, the blower motor turns on, however the outdoor unit does not kick on. Is the outdoor unit supposed to turn on also, when calling for heat?
Thanks!
Welcome!
It's a great video for chasing wires. Good job and thank you! I'm troubleshooting an issue..
My carrier heat pump was replaced last summer. I turned on my heater and it worked one night and now the air handler isn't coming on any More. But the heat pump is coming on. They changed out my thermostat when they changed the outdoor heat pump. The batteries are good in the thermostat. I also checked the little fuse in the circuit board and it's good. What could have happened?
So I guess the reversing valve fails in heating mode from what you said. which sense makes because you wouldn't want it to fail in cooling mode and freeze your house out lol. Awesome video gained some massive knowledge on this.
Awesome, thanks Michael!
thank you
Very well done. Personally I have found I prefer when the manufacturers energize the reversing valve in heating. If the reversing valve fails they still have emergency heat and in summer they still have a/c. It takes the pressure off me as far as how fast I need to respond. Seems today people become more irritable without cooling than without heat.
Very true. Also what good is it if the reversing valve fails and the unit can’t go into defrost? You will only have heat for a short time before the outdoor unit turns into a block of ice.
Very informative video. Living in an apt building, I have one question still. Hear clicking off and on quickly in my wall next to my air handler. Suspect faulty heatpump switch. They are on roof. Air handler cycling normally and cooling. If I shut off breakers for heatpump, furnace in breaker box and separate breaker on front of air handler and still hear noise between walls, does this mean I could behearing noise from a close apt by me and their unit? Would my heatpump be shut off by doing what I mentioned? Thanks, hope for an answer! Hate to deal with maintenance here, the are not very knowledgeable
Hello. Watched the video to the end. Good information. So we had a new 95% LP furnace put in along with a heat pump installed. So everything works with the heat but when you turn the thermostat to cool it blows out hot air. The company has been back out several times and they are not sure but they think it is the new thermostat they installed. They manually reversed the valve and we got cold air. All wires in and out are getting continuity but when switched to cool the thermostat is not sending a 24 Volt signal to the heat pump to turn it on for cooling. The outside unit works fine for heat. Everything is brand new. Any thoughts or help would be greatly appreciated. Thank you
Awesome video! I love it! Could you make a video on the older system without the control board, like an old Fedders model # BWRE018S7DA?
I’d very much appreciate it. I run into dinosaur systems a lot here. These systems are the ones driving me crazy.
I’m really learning a lot from your books. I’ve read it 3 times now and get more from it every time I read it. Thank you so much!
Good show, after watching the show I thinking my reversing valve might not be working, I live on the west cost of Florida so it’s warm even at 3AM it might be 86 outside. My winter bill is about Twice the summer bill I be keeping an eye on it.
El mejor video que he visto.
Sería tan amable de hacerlo en español.
Great video.. I have one question... Is the thermostat the only control keeping track if the heat pump is not keeping up, or do some defrost boards have a second function, when to turn on aux heat. I understand the defrost board will signal the w/aux for resistance heat until defrost is completed. The reason why I ask is because I can't find this information in the install manual of the rth2410/rth2510 thermostat.
The defrost board should turn on the aux heat only during defrost mode. In that case, it energizes the W wire.
Wow what a video
Thank you for mentioning that the white wire on defrost board is an Output
Need advice,
I have a common 3 Ton split system gas furnace. My compressor failed after 15 years of service. I recently purchased a new 3.5 Ton heat pump condenser as a replacement. I would like to take advantage of the heat pump technology and use the gas furnace as backup heat. My question revolves around the specifications of the new replacement evaporator coil. I noticed that most heat pump condenser units are married to an air handler with electric backup heat, instead of an evaporator coil box on a gas furnace. I understand that gas heat is possible as backup with a heat pump, but I'm confused about what modifications need to be made to the evaporator coil TXV. Please advise if there are special TXV for heat pump evaporator coil configuration and if there is something that is needs to be done to the furnace.
Thanks
Kevin
Thank you for your video. I checked there is only 13.5 VAC between Green and Red wires on the thermostat. Where should be the problem from the control board?
Thanks for your fantastic video and explanation.
R wire is going to the outdoor unit. Could you please tell me what the purpose of this R wire is? The new heat pump outdoor unit requires only 4 wires ( O, W, Y and C wires).
Thanks
Thanks
Welcome
Super
Hi what happens when low side pressure goes up to Retard?
What is the solution.
Have u had to collect a lot of condensation in the air handler area with the heat pump? Has there been incidents of huge water collection in big metal pans?
Is there supposed live wires - hot and neutral going to the black breaker next to heat strip?
Another great video Craig. Could you possibly do a video on microchannel coil repair?