How HVAC Refrigerant Pressure Switches Work & Troubleshooting!
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- Опубликовано: 26 июл 2024
- I Show How to Read the Cut-In and Cut-Out Pressures of High and Low Limit Refrigerant Pressure Switches used in HVAC. I Show How the Refrigerant Pressure Switches Work and How to Troubleshoot Them by Reading the Refrigerant Gauges and Measuring Resistance with a Multimeter. Supervision is needed by a licensed HVACR Tech while doing this 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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Great demonstration of showing how to check pressure switches and its operation. The biggest tip was that not all pressure switches have schrader valves which is a great safety tip for beginner techs to remember.
Thanks a lot Stuzman!
Absolute amazing video 2nd yesr sparky who haven’t learnt much as of yet and this has just helped me out so much thank you
You’re the best Craig I really appreciate all what you’re doing and thanks a million for sharing your knowledge and pass it to the new generation
That's the best video I ever seen about low and high pressure switches!
I love this channel, thank you so much for taking time to make and post these videos!
Thanks a lot Brett!
Great video, very informative! Thank you for making this.
Thanks so much for comprehensive demonstration. Helped me a lot.
Every time i click one of your videos, its straight forward and very informative for a tech or who is trying to be one.
You are a good teacher you should be one if you are not.
Thanks a lot Artur, I am an HVACR teacher. I am also putting a refrigerant handling book together. I you would like to get on the book release list, just send me your email at info@acservicetech.com and thank you very much for your comment!
What Paul Danner is to automotive Diagnostics this man is to HVAC technology . Amazing teaching and diagnostic skills :-)
You do a great way at explaining things in thorough. Thank you sir
Great video for a beginner. I always enjoy watch and learning from your videos.
I know this is an old video, but Im just finishing school and the material you put out is fantastic. I have your book…right now Im just a goofy new guy..but your book is my goto source. Thanks again.
Late to the party because I'm on call this week and was pretty busy yesterday.
It was interesting that you could hear an audible click when those pressure switches opened and closed, however you would never hear it with the compressor or the fan running. Good stuff Craig!
Thanks a lot Tomon8tor!
Always great learning channel.
Yes I use Amazon to get some of tools on the list.
Thank you.
That is great, anything purchased after entering those amazon links provides a commission for the channel! I used to have so many people asking where to get the tools from that were used in the video so it takes care of two birds with one stone. Thanks Octavio Delgado!
Really appreciated your hardworking bro..it really help me to understanding the ptc better..thanx bro👍👍👍
Excellent explanation.
Craig once again your give outstanding video instruction! Keep up the good job Cheers!!
Thanks a lot Paul HVAC!
I find all this HVAC stuff to be awesome. Electricain here from Indiana, Pa
Thank you so much for posting these videos. It really ads to my diagnosing arsenal.
You are so welcome!
This is a great demonstration. Love the little custom tool you brazed to show this. Demystified them for me =)
Glad you enjoyed it!
Thank you for making this video👍🏽👍🏽👍🏽
Thanks Edgar!
Got my universal in the mail today, thanks dawg. Your videos are very helpful for someone green like me.
Thats awesome Cole! Congratulations!
Amazing video wow I’m speechless you are a great instructor thanks for sharing
Thank you very much! Have you seen the sample pages and outline from my refrigerant charging book at acservicetech.com yet? Thanks!
this helped a lot
This is very useful, I appreciate this tremendously.
Glad it was helpful!
Very good information thank you
Thanks ejohnfall!
Awesome video, I like all of your videos
Thanks a lot Pedro!
Thank you! New camera?) Video quality is much much better.
Yes, I trying to put out all 4k now thanks to you Patrons! Thanks Tapch MC!
thank you very much sir.
Very very very great explanation.
Thanks a lot Suhaila!
Thanks for the video =)
Brilliant
You and videos kick ass .. Keep up !!
Thanks a lot Armando!
Super sweet video. you da man
Another great video
Thanks Luis!
Thanks 👍
Great Video
Thanks Deanmartin1966!
Brilliant explanation!
Thanks a lot spelunkerd!
excellent job thank you
Thanks for watching!
Great video!
Glad you enjoyed it
Thank you man I learnt a lot from you video
Glad to hear it!
Thank you so much for this video. Never learned that much in training or working in the field.
Having a trouble with a fairly new Trane heat pump. Something I have never heard of or seen before. The contactor had an intermittent problem which after two visits got to see first hand. Customer was complaining about a grinding noise (always a red flag) so I came and checked but found nothing wrong and pressures good. Only oddity was a fried lizard on top of the capacitor. The cap checked out OK. About 2 weeks later unit wasn't working. Cap still good but unit wouldn't work. Standing pressure was over 200psi. I pushed contactor in and ran fine. When I released it stuck just slightly as I moved my hand away. Didn't give that much thought and went to attic to check safeties there. All was fine. Back to HP.
When I went back outside the unit came on. As I was watching the gauges the contactor started to spark and arc bouncing in and out making the grinding noise the customer had mentioned and was really scary! I pulled the disconnect and replaced the contactor but again the unit would not come on. I thought maybe compressor went out on thermal. Only thing I could find was the low voltage was being stopped by the high pressure or high temperature switch. Now I need to figure out which one and replace it. I am guessing it fried when the contactor arced but not sure. Watched this to see if I could learn more about these switches and how to test them. THANKS!
Also check for incoming line voltage and voltage drop while running. There could be an issue there, thanks!
@@acservicetechchannel never seen where they wired the high pressure and high temperature in line together. I was able to pull the connection to it and put it on the contactor for now to get them cooling. Guess I am going to have to replace both but it looks like pressure switch is welded in .... ARGH
Great video
Thanks for the visit
Thank you, thank you.... you have taught me so much. God bless!!
Thanks a lot Danny! May the Lord Bless you too!
do you guys have a video like this on transducers?
About education vedio....... Very nice
Thank you!
What would you recommend for cut in and out if the box room 50/55 degree on 404a refrigerant
Thanks
I wanna know working and cut out and cut in pressure for frions
Can u explain if possible
Do the pressure switches come standard with a Schrader depressor so they can be changed out?
I have a 2013 RUUD 3.5 ton heatpump,
Model #13PJL36A01 with 410a and a 63 ft. lineset. Yesterday it shut off after running
1 minute and 45 seconds. Liquid pressure stays at 175psi the whole time and vapor pressure started at about 50psi and immediately when unit came on the vapor side pulled into a vacuum. LED 1 is on but LED 2 flashes which states low pressure switch open. What are my possible causes? Been running great, filters clean as well as outdoor unit. Indoor unit has TXV at 2 o'clock position as called for in manual.
The Lennox unit I just repaired at my home has a pressure switch with a reset button on it. The outdoor unit would not power on at all. I pushed the button on the High Pressure Switch and the unit started running again. I felt a distinct click when I pushed the button which you can not feel in subsequent pushing.
Hello there Question. will a defective pressure switch make a condenser unit not cycling off when reaching set temperature? Thanks for any advice....
Hi guys. GREAT channel. Had a fault code showing 02 (high pressure switch) and replaced with exact same. Still showing 02? Is there a reset somewhere on the board that I can't find? The compressor & fan work fine ONCE I get the blower motor working. It trys to start 3 short times, then waits. The last time I got it running the speed was sporatic until it stopped? Replaced the capacitor with same a while back & cleaned the blower fan cage. I just have an Etek 10709 multimeter - probably need a new eh? System is an All-in-one outside Q7RE - 042K. Any ideas will be a Christmas present 🎅. Thanks
Great video sir 👍.. I have 1 question. In case of gas shortage due to gas leakage occurs. Low pressure switch will disconnect the electrical circuit and the compressor will be off. So, what is the procedure to fill the refrigerant gas to the outdoor unit? .. So the compressor can turn on again after we fill refrigerant..
Bypass first the pressure switch. To run the compressor to fill up gas into the system.
I have an intermittant low pressure fault but it occurrs a few seconds *after* the compressor stops any ideas?
So, are all pressure switches normally closed
It wasn't clear whether the firs number is when the sensor opens circuit and the second number when it closes the circuit.
Hi, My condenser isn’t turning on due to refrigerant leak and 24 volts are shut off not getting to the contactor. Since the condenser is not turning on, how do I pump the refrigerant into the system to increase the pressure order to run again? Can i still pump the refrigerant when condenser unit is off? please help thanks 🙏
Please do not try to add refrigerant into a system without being properly trained first . Not only can you possibly harm yourself or the equipment, it’s against USA federal law for anyone not EPA certified to buy and handle refrigerants.
How would you test if the system went out due to low or high pressure cutout? Thanks!
You wouldn't get 24v on each side of the pressure switch, only on one side. Put the multimeter probe on a common and the other probe on one side, then move the one probe from the one side to the other side to check for 24v on each side, thanks!
@@acservicetechchannel I never understood how some defrost controllers claim to detect a LP or HP when the switches are wired in series between Y & T1.
I have a 95 thunderbird which compressor is not coming on. It has what appears to be a 4 wire high side switch. I was not finding any way to test this 4 wire system.
I would recommend just trying to look up the model number on the switch so you know exactly what it is supposed to do and how it operates at the pressures, thanks!
What happens if I’m checking for continuity and one of the switches is giving me a measurement of 430 ohms? This is when I have my meter set for continuity. The other one just showed 0 ohms.
I have unit that takes 7 lbs of 407 c. What would be the static pressure with the unit off with an ambient temp exceeding 115 degrees?
247-280 psig with the system off at 115 degrees thanks!
AC Service Tech LLC something I’ve always struggled with, determining the proper pressures for given refrigerant at different ambient temperatures. How do you know what the pressure should be at a certain ambient?
AC Service Tech LLC also thank you for making these videos , you are a great instructor and really know how to break things down and make it make sense 👍👍
What can be the issue standing pressure is good and then compressor comes on the pressure go very fast down and compressor shut off??
Probably a restricted metering device or low refrigerant.
My heat pump cuts of in heat or ac mode and flashes 5 times after about 10 min of running. And will not cut back on. Buuuut the pressure is correct all the way up to when it cuts off. Bad pressure switch maybe???
So the high pressure switch is NC switch and low pressure switch is NO?
If yes, how can we get 0,001 resistance across both of them!?
I need that explanation in Spanish, it looks very professional but I don't speak much English, and I had a problem that I think has to do with your video, that's why I'm watching it but I don't understand English very well, I'd like to hear it in Spanish.
The example of having the LPS and HPS in series connected to the contactor is wrong
Doesn't the compressor have an internal pressure switch?
Yes it does but you don't want that to releasing much because it will become weak and start leaking, thanks Running Coyote!
The question is how do you know which switch has a valve core depressor in them so you don’t Blow the charge when you try to RELACE THEM!
They said how you can tell.. read the literature.