Air Conditioner Troubleshooting! Connecting, Measuring, Fixing, Disconnecting!

In this HVAC Training Video, I Show the Step By Step Procedure for Fixing an Air Conditioner that has a Frozen Suction Line if its not Low on Refrigerant! I Show Manifold and Hose Connection, Measurements, How to Fix the Problem, Taking Measurements Again, and Proper Disconnection from the System. Make Sure You Are EPA 608 Certified Before Handling Refrigerants. We use the new ‪@NAVAC‬ digital manifold! 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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#hvacr #hvacr #hvacr #hvactrainingvideos #hvactraining #hvactraining101 #acservice #acservicetech #hvactechs #technician #training #airconditioner #airconditioning #charge #checkingthecharge #refrigerant #refrigerantcharging #frozen #line #hvacproblem #disconnect #hvacsystem #suctionline #hose #manifold
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[@dannythompson1948]

Dude, it is so nice to have somebody do a repair video without shitting on their customers. You got a sub in me. Im a building engineer, but HVAC is definitely my weakest link. I enjoyed eevry aspect of this video

[@realSamAndrew]

I don't understand what you mean in the first sentence of your comment.

[@Alex_hvac]

@@realSamAndrew It's a bot. This or DYIIdeas, both have word for word comments.

[@realSamAndrew]

@@Alex_hvac thanks for the heads up. But that diy comment is only a few hours old and this one is 3 weeks old, so it's likely the new one is the bot. I don't understand what good is the comment anyway, what's the point of the bot?

[@davidsanders6957]

Guy has the patience of a saint, sign of a very good instructor !!

[@acservicetechchannel]

Thank you so much for your kind words!

[@rubengorospe939]

@@acservicetechchannelhi may I ask if you guys do house services…thanks

[@SteveSam66]

I retired from the trade after many years. I enjoy watching your videos to keep me sharp

[@acservicetechchannel]

Thanks for watching and subscribing!

[@DayClanTribe]

Steve, you didnt happen to live in SE Portland area and moved to Arizona back in 2017?

[@SteveSam66]

@@DayClanTribe not me

[@dane1234abc1]

Great video. I am an Electrical Engineer specializing in RF, and I greatly enjoy your videos. I want to be a better informed consumer when it comes to HVAC.

[@TomLawson05]

Thanks Craig for all you do teaching young and old techs thanks again for the video

[@acservicetechchannel]

Thanks for watching!

[@DYIIdeas]

Dude, it is so nice to have somebody do a repair video without shitting on their customers. You got a sub in me. Im a building engineer, but HVAC is definitely my weakest link. I enjoyed eevry aspect of this video

[@livingyourbestlife711]

Excellent video Craig. I am a TAB pro and you can't imagine how many commercial systems have AF issues. I travel all across the USA doing this for major stores. This is a vital component of HVAC design and TAB of AF. Thanks for sharing!

[@TrustedHVACR]

Great video! ABC - Airflow Before Charge ❤

[@SpecialistOne]

Amazing instructor, patient, knowledgeable, and all done very well.

[@moy6569]

Thanks for these vids man, I'm currently working medical records and trying to bring more value in my life with learning this trade. Just passed my epa608 universal exam. I appreciate the way you teach. On my way up hopefully. Peace!

[@acservicetechchannel]

Thats awesome!!! Keep pushing forward and learn as much as you can!!

[@lestalkmorebasss]

Good demo…. In my residential experience freezing up is almost always low airflow…. Rarely did I find a low charge causing freezing. A very dirty air filter was the most common reason for low airflow issue

[@Niveous23]

My second year HVAC teacher used to be the Trane tech rep for the whole state. They found some dusty old neglected books....all about airflow. They made it their mission to teach the new generation the importance of air flow. Calls himself an, 'air-head' quit proudly. But when a job gets tricky....for no seemingly good reason....it's airflow. Could be duct design flaws, could be debris, could be fan speeds. But it's a whole dimension of HVAC that seems the most neglected.

[@gatesmw50]

@Niveous23 One of my all time favorites is when we went on companies jobs where duct work was undersized.. I would see ONE 4 inch return for THE ENTIRE 2nd FLOOR of a home with a upflow gas furnace in the basement. Then they wonder why it is always hot upstairs ? Saw a lot of this on 2 story Cape Cod homes in New Jersey

[@zahedaminullah6934]

Good job as always man. The way you fixed the airflow was good. If you can show a video on one of the new carrier dip switches, the Lennox, the more new furnaces because a lot of people get confused with reading the manuals. Great video man,this will show a lot of newbies to the trade to not just add refrigerant and leave!

[@wilfredovega577]

Once again a great demonstration of using true grid and gauges properly. ty so much

[@acservicetechchannel]

Thanks for watching!!

[@reynaldojimenez1562]

Thanks for all the info, you’re the best. You make it so easy to understand what you are explaining.

[@princesscharming360]

I really enjoy your videos. They are very informative and helpful. Keep the coming!!!

[@JoseCruz-hr7gv]

Great video! Thanks for the effort you put in each video! We appreciate you!

[@izzymoney85]

Craig Thank you again for another great video something i can show our new apprentice so he can better understand the way u teach is amazing I really appreciate you and all you do keep it going my friend 🙌👍

[@acservicetechchannel]

Thank you for watching and for using my videos to help teach new apprentices!

[@jakimsmark]

This is all good an all but I’d say maybe 85 to 90% of all techs don’t have these instruments and time on a service call to do all this but is very informative to know what to look for when gushing up on a system what to look for that I like a lot 😊

[@whochecksthis]

Those valve caps with a hole in them are brilliant. Great way to test schraders without getting water and soap in the service ports!

[@1KsE1]

This is why I always check filters and indoor and outdoor fans before even putting gauges on a system.

[@watermanone7567]

Excellent video, I'm not nuts about the gage set you are using. Thanks for the video.

[@nadjibmahmoud9472]

the best instructor ever, thank you Craig for your efforts, god bless you

[@acservicetechchannel]

Thanks for watching!

[@jamesortolano3983]

Ahh i like that you changed out the fan speed settings, nd tonage on the board . Thought it might have been the dip sw config. Props to you on the approch method as well with line temp minus sat temp for your sub-c /supr-h This was another fine video craig you made for us guys in the field. We all do appreciate it very , very much Sometimes not all the time ill bleed my lines back into unit , nd sometimes ill leave my lines full . Thanx again this was my weekend off 😅

[@horsth9566]

Another excellent educational video. Thank you!!

[@Sctronic209]

I like that control board haven’t run across one like that yet.👍

[@30rdmaga]

Always go inside and check your airflow first! Always

[@LTDan-pk3mx]

Dude.. It finally hit me you sound exactly like senator Jim Jordan who i absolutely like alot.. Love your teaching as well!!

[@miguelrojas3394]

Very good video as you always do Craig, I would like to see videos on RTU units from you and thanks for sharing knowledge 👍.

[@hamidraza5748]

Very explanatory and informative video thanks sharing the experience and knowledge thanks

[@95GTSpeedDemon]

Awesome video. Great info and explanations. I like that gauge set

[@markdessaso4304]

This video helped me so much, I’m an apprentice in my first year and I love it so much, you explain so well and it helps.

[@acservicetechchannel]

Thanks for watching, I hope things are going well with your studies! If you want to learn more, check out the free articles and quizzes we have on our website, acservicetech.com!

[@gregs9555]

Had a maintenance guy at an apartment complex add an additional 3 lbs of refrigerant before even checking the airflow. Went there and found unit shutting off on high head and a clogged air filter😆

[@stevencossaboon3237]

Great job and video Craig. Thank you for the knowledge.

[@alejandromata825]

I like that airflow device and app!

[@wagnergitirana]

This is an awesome explanation. Too fast paced for my mind but that’s why I keep playing back so the message can sink in. I got Craig’s book and workbook as well. This explanation also is way better than the ones I have learned in HVAC classes. Thank you Craig!

[@acservicetechchannel]

Thanks for watching and for picking up my books!!

[@wagnergitirana]

My next purchase will be the your handbook and workbook for mini-split! Thank you so much. You are the master of this trade!

[@hisam9599]

Plz do more services using the Navac Digital gauges

[@mariomendieta8036]

Thank u so much for the video…it’s very useful and informative.

[@paulrozinski1488]

I see all the new Navac equipment in your demo. What’s your take on them vs Fieldpiece ??? Nice video as always.

[@davegeorge7094]

Best demo one has seen!

[@acservicetechchannel]

Thanks for watching!

[@BrahimAbdelsadek]

Cheers from algeria👍Thanx for sharing

[@acservicetechchannel]

Thanks for watching!

[@jaguilar11009]

Good job 👏 well explained 👏 👍

[@ryang8041]

Would love to see a video about scenarios that arise if you work on the wires for an ecobee while the 24v circuit is live. Had a few installs where the 24v fuze went. Ecobee was never on the wall tho and looking back, almost every time it has been the fuze which wrecked out or the ecobee after pressing it onto the wall plate. Hopefully Craig can save the day on this LOL.

[@jjjohn5914]

Excellent...a real professional!!!

[@acservicetechchannel]

Thank you! Cheers!

[@DM-kb3bi]

Would be nice if every work space was this spacious.

[@millenialmemoirs]

ABC. Airflow before charge. Check static pressure (after thawing coil if needed) and compare to blower table to ascertain cfm. If airflow is good, ascertain whether it’s low charge or perhaps a liquid line restriction.

[@MushtaqAhmed-v4e]

Very nice teacher

[@jamminwrenches860]

Had a lady set her laundry basket in front of the filter return. She would move it during a service call but place it right back. Being a hard headed tennant my only option was a pressure switch and delay on break.

[@APG-gignac]

Great video. You are awesome. I bought your book 😀greetigreeting from Austin,Tx!

[@acservicetechchannel]

Thank you for watching and for picking up my book!!

[@zww49]

I really appreciate your explanation and your so knowledgeable thank you for your expertise..

[@acservicetechchannel]

Thank you for watching!

[@danielsanchez6698]

Can you do videos about VRF and VAV and terminal boxes for those of us who do commercial hvac

[@GOODNEWSHVAC]

소중한 영상 고맙습니다

[@ddee2501]

Great video, very informative !

[@DarkModderYTYTGAMER]

thank you so mach you are the best teacher

[@k-laus9435]

I’m a commercial hvac tech since 1994. I have swapped out 10 and 20 ton compressors and had to swap oils. Every single rep I have talked to said the same exact thing about contaminants between the different oils saying just dump it and refill with new. I have never had a issue with contaminanting system so I absolutely don’t believe that hoses can do this.

[@acrepairnearme]

Hello, Craig, please make a video of why the liquid line may sweating in cool mode. I have a real weird case of replacing a 10-ton Carrier condenser. The temperature of the liquid line is below the ambient temperature, it’s about 70f from the exit of the condenser up to the coils. But it’s only sweating inside of the house. Across filter drier no temperature drop. Suction pressure 110psi. SH 10, SC 0, if adding more refrigerant, suction line starts freezing. I’ve insulated the liquid line for now but I want to fix it the right way. Thank you for your videos.

[@DJV94022]

My recommendation for those new NE florida techs specially new construction. 1.make sure your king valves are all the way open 2.air filter is clean 3.make sure your thermostat and condenser wire isnt switched up (since green isnt used coming from condenser) 3.5.Youre blower kicks on (jump G terminal with your alligator jumper to R) and the bolt is tight to the blower motor shaft 4.your air handler door is on 😂 5. If its still freezing up well make sure your txv is not freezing up (stuck close) usually itll go to pump down or stay at a crazy pressure like 50-80psi lets say 80-100f hot day :run it heat for 20 mins so it can unstick making it open up) 6. Your thermostats are calling and dampers match thermostats zones..and see if your dampers are fully open or closed when needed to.and bypass click on motor is clicked on well ( if it isnt all the extra air will go back to the evap coil freezing/choking the coil up or overheating the system in heat mode(winter time)

[@FunGuyFruits]

What about doing a little purge right before snugging the fitting to get rid of that small amount of air? Also, Those gauges are really nice for the price vs. Fieldpiece, how have they held up?

[@winstagram1785]

Your videos keep getting better, even this far along! Love the trick about getting the charge from the gauges back into the system, especially important with micro channel. Of course, I would recommend wireless probes(Joblink are my fav), but not everyone has those.

[@acservicetechchannel]

Thanks for being a long time watcher! 👍

[@JoseRodriguez-pn9hx]

How do this manifold gauges compare to testo and fieldpiece? Great video as always.

[@enduringpromise]

Do you have a video that talks about the different options/settings on the control board? Also is there a cheaper option to test air flow?

[@wonkastudio-johnny]

Craig couldnt a wrong direction blower wheel also cause this low air ?

[@whochecksthis]

Absolutely. Most any anomalies to the indoor system will affect airflow. Dirt buildup on the blower wheel is a pretty common issue.

[@marcioviana3438]

You are the best 🙌🙌🙌🙌

[@whitebear1903]

Thank you a lot 👍🏼

[@southside6924]

I like that style unit simple

[@leviv2870]

Are you going to make a review about that NAVAC NX1 digital manifold? I don't think anyone has made one yet.

[@scotty3725]

Good video

[@johnwarren9306]

Good job great video thanks

[@youngbuckrefrigeration716]

Appreciate the video 🔥☝️

[@acservicetechchannel]

Thanks!

[@emoneyblue]

Is the card information also inside the book already? or am I required to purchase both? because they cover different subjects thanks for sharing.

[@jeffjames4064]

I had this problem a few weeks ago , finally got it fixed. I always thought HVAC systems were the machinations of dark magic. Yep, I was right😁

[@shawnrender6935]

Thank you

[@naeemdadream2826]

Nice work 😎

[@user-el8ef6nm6b]

Hi mate I have a Panasonic CU-Z24RKR. I need to disconnect, and shift appropriately 9 mts. Do you have a wind down procedure to push the gas into the unit? Can I use mechanical fittings to add tube length? Rather than weld? What is the best and cheapest tool set to vac and release the gas back into the system once moved? Appreciate your response🎉

[@philiph1234]

Another great video. Thank you, Craig. It’s a demonstration that TXV can handle some airflow differences but not this extreme. Do you think that TXV can handle up to half ton mismatches in condenser and evaporator coils? I purchased your books for the learning and to show my support. Do you also accept donations through PayPal?

[@whochecksthis]

1/2 ton oversize shouldn’t be a big issue, but 1/2 ton undersized evaporator, and you will have issues even with a txv. Unless the compressor can compensate for the heat reduction, you will get slugging with a txv.

[@MountainSalsa]

Ty!

[@45KevinG45]

Great video

[@pallermo]

Hello, can you please record one video with full instructions (proper procedure) for filling mini split system witch was fully discharged (example - damaged piping). Is it proper to open valves and do necessary vacuuming including compressor side. After that, filling with proper weight of gas into the system - usually written on the device. So, mini split inverter with R32 gas. Or...you already have such video. I couldn't find it. Thanks

[@darriuscole8544]

Are NAVAC digital gagues any good? They seen to cost a little less than Testo and Fieldpiece, but sometimes paying less costs you more. What brand of digital gague do you guys recommend? More importantly, what brands should I avoid at all costs?

[@rosalinotapia2828]

Thanks..❤

[@DanielMalkokian]

Quick question why did you have a high superheat with low airflow?

[@ElrataAlata]

Wondering this as well

[@jesuscard.1675]

Hi Craig. I have the same pressures and temperatures, but i noticed that the pressures don't equalize when I turn the unit off that to happen when the txv valve is bad. Hi side remains hi and low side remains low.

[@calex9398]

Very nice my friend

[@patrickmcgraw5865]

You have to have that true flow grid for the app to work properly?

[@claytonlongworth1145]

You said low airflow with txv would still have a normal superheat. Before you changed fan speed, superheat was at 20 afterwards it was 15.3. I apologize, I'm confused.

[@972958]

Lately ive been been running into 20 seer+ inverter split systems like goodman, carrier,lennox and trane. Is there any error code training we can do craig!

[@harryoneill9266]

If the airflow is maxed out based on the fan, could you limit the maximum output of the outdoor unit to solve this problem to say 50%? (trial and error to determine maximum). Is it as simple as saying if the evaporator is below freezing temperature, you will have issues?

[@MattJMT]

Craig I work for the government doing HVAC. I do not own personal gauges. Do you recommend wireless or manifold?

[@Stevenowski]

The first thing that popped into my mind when I saw that frozen suction line was a dirty filter.

[@JamesDean-no6zg]

Hi, would low air flow also cause the suction line temp to be very low as well? Maybe 30° suction line temp.

[@jakbo_]

The problem with that CFM flow device is that you had to remove the filter to test it so you're not really testing what the actual CFM on the system is going to be. As soon as you add that filter you may have went from 3 tons to 1 1/2

[@acservicetechchannel]

The tool and app incorporate the static pressure measurements of with and without the filter to extrapolate what the cfm would be with it in. That's why there are two measurements in their program to find airflow.

[@fredrejouis3018]

That’s a 4-10a pressure low side and high side supposedly be

[@E85_STI]

Quick question a carrier unit at the condenser the suction line isn’t sweating it’s getting cold but not sweating like the unit right next to it they have two units for the house. The capacitor is a 35/5 and the micro fareds after testing is 29 on the Herm but the compressor is on and is not humming. I’m suspecting low refrigerant but the ambient temps inside the house is 76 degrees and the T stat is set at 73. Could a cap that’s lower than its 6% capacitance cause this or is it just low refrigerant? I’m going to buy some digital gauges to have to check pressures and all that but I don’t work for a company I did graduate the course with a degree in refrigeration but I just do small troubleshooting on the side in the neighborhood. Just getting info on other things to check the condensate is not clogged and the air filter is clean.

[@rickcantu4501]

Hi got a question , Would the evaporator superheat be low due to lack of airflow ? Why doesn’t it show los here ?

[@trevmint5615]

Good morning Craig. Do you prefer thermistor clamps or thermocouple clamps?

[@jakbo_]

Do you like those gauges?

[@acservicetechchannel]

They are quite nice!!

[@samo8204]

I have a problem that maybe you could trouble shoot? The coil above the filter freezes up if I try to run the A/C too cold. How cold should I be able to set it before this happens?

[@WaldoG-b9j]

What are the best digital gadgets a2l compatible thanks

[@ChilePicanteKornNvtz]

How do you know if you've rid of the air out of the system? I didn't see anything come out except air.

[@mikestevenson1819]

Airflow first always