How To Check Superheat & Subcooling On An HVAC System

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⚠️ Disclaimer:
This video is for educational purposes. Any and all HVAC repair work is done at your own risk. Before handling any type of refrigerants, an EPA 608 certification is required by law. The DIY HVAC Guy channel is not responsible for any possible damages or injuries caused by the use or misuse of the provided information.

[iceyaj]

throughout all the HVAC tech guys on youtube, you're the only one who makes it easy to understand. Thanks for the info!

[alexjustasu]

your explanation very clear and very easy to understand at least I find good HVAC teacher by video.100% like

[hediervarelamedina]

The video is respectable and the truth is that in the little that there is agreement that the pressure gauges should be installed with the unit turned off and what I did not see was the bleeding of the hoses, so they say that it is not important to bleed to remove any air that may exist within them and thus prevent contaminating the system. For the most part, the video is respectable.

[OnRappel]

Dude, I watch a lot of HVAC channels and you channel is the best by far! Keep up the good work!

[trex]

My area is new to cooling since we never had the need. We have nothing but swamp coolers. I've been working with our northern branch JR and you explain it better than any of them! I ordered the service book! Thank you!

[cacornett]

I learned HVAC on my own reading books ( yes we had books in my day) an my dad taught me alot too. He was in HVAC engineering at the VA hospital Cincinnati. Taught me how to use gauges and other thigs. But I knew nothing about super heat and sub cool. Maybe they didn't use it in the old days, I don't know. I love what you are doing for DIYers like me. I need to know how things work and HVAC is one of my interests. Thank you . Well done!

[mark]

I got to say I watched a lot of YouTubers and for some crazy reason you're the only one that really explains it very well. I feel they all understand it but there's these obvious steps that they're not realizing the novice doesn't get. Very good work for such a young guy Thank you!!

[Frank_Techguy]

Excellent video on explaining Superheat & Subcooling on a HVAC system. Keep up the good work.

[UncleMerlin]

Hello, I am a Vietnamese and follow your YouTube channel a lot. I really like the way you share with everyone, it's very easy to understand and very approachable, I really like the HVAC jobs but I can’t find a job because my English is not good enough to communicate with the customers

[TanveerKhan-hjlp]

Thank you Sir for uploading this videos, I learn alot from your videos

[georgewashington]

Another great video, explained all the details as to what you were going to do, the steps as you performed them and showed all the steps in calculating the results. You do a good job and thanks for all you do to inform those wanting to get into the field and for those like myself who just want to know all aspects of HVAC because I find it very interesting. I like troubleshooting and I did that in my career as an electronics technician for the Air Force and later for the FAA. I am now retired but continuing to expand my knowledge base. Keep up the good work. BTW, today I noticed my compressor was making an unusual sound, it was not running at a steady RPM but sounded like the speed of the compressor was oscillating. I made some voltage and current checks and found the start winding to be only 2 amps whereas the run winding was 26.3 amps. This is a 5 ton unit. I pulled the power and checked the capacitor. The fan capacitor was right on 5 mfd but the run capacitor was only 17 mfd when it should have read 60 mfd. Also it was a leaky compressor, the resistance drop across the herm contact to common was 17 k ohms. I had a spare, put it in and the start winding current went to 7.5 amps and the run winding current dropped to 20.5 amps.

[fsoakcreek]

Thank you very much. I learned more in this one video than a month surfing the internet. Im looking forward to putting my first DIY mini split together next month. :)

[connorcoutant]

Thank you for this video. I’m an apprentice currently trying to figure all of this out, very helpful! 😄

[loudroarTV]

OMG! Thank you for clarifying and helping on what to look for when troubleshooting. I have some experience with working on small appliances and auto air conditioning, but never on my home ac. I appreciate the tips!

[deanmartin]

I don't think you had enough of a heat load in the house to properly check the charge. That's probably why the chart didn't help. Crazy to see that B vent installed in the wrong direction. Chance for CO2 leakage from the flue joints on the furnace? I would of also checked the Delta T just to make sure you had around 17-20 degree split. I was taught to check the outdoor ambient temperature in the shade and not directly in the sun. I love Craigs channel too. He is one of the GOATS of Hvac.

[glendurant]

Hi there, i love your videos and please keep up the great work with basic explanations and tips, This makes you
the King of H-vac.

[giantkillin]

getting into advance stuff but will add it to my study list.!! thank you

[samygold]

It's great to find a free ebook copy of this book online😊

[transmitterguy]

Great video, I work on my own system and value this video as a refresher course. Thanks.

[Honestandtruth]

Clear and thorough Explanation, Thank you brother 👍👍