HVAC Service Call- No A/C, Electrical Troubleshooting & Refrigerant Charge Check! Fixed!
ฝัง
- เผยแพร่เมื่อ 8 ก.พ. 2025
- In this HVAC Video, I go over a No A/C Service Call and all the steps I took to fix the system to get the Air Conditioning back up and working. I performed Electrical Troubleshooting and Compressor Resistance Reading, Amperage draw, Measurement of Refrigerant Level, and how to thoroughly complete the job. Supervision is needed by a licensed HVAC Tech while doing this as Experience and Apprenticeship garners Wisdom and Safety.
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Thank you . Greetings from North Africa
Thanks Salvador Dali!
I had a call last week , I did my ohms resistance test the Same exact way . It ohmed out as a faulted compressor so I condemned the unit . What I didn't do was actually open up the fan section and check my readings from the compressor terminal themselves . Long story short , the common wire on the compressor terminal was out of the lug causing the false reading . I went back and fixed the issue . Compressor was ok . That being said , it's frustrating to get to some of these compressor terminal on the residential end . It would be nice if the manufacturers would have easier access to compressor compartment . It would save us so much time , especially on a day when you're backed up with multiple calls . Anyway, great tutorial as usual ! I find myself learning something new on everyone of your videos .
If I didn't get the right readings I would move onto the inside at the compressor terminals. I won't mention anything to the homeowner until I am certain, thanks. Yes you are right, you have to really get in there to have access to the compressor terminals!
acservicetech good point . Coming from the commercial side to the residential side has been culture shock for me . Everyone on the commercial end thinks their better or know more because there's moving moving parts . It's all the same concept though. The difference( from where I stand )is dealing with customers on the residential end is so more personal and even contentious at times . On the commercial side of things you can tell a store manager anything and they could care less for the most part . Just sign here and you're good . Corporate will deal with it .
Ha yes it's different. I think a very big difference is in Commercial for larger jobs that there may be a long bidding process were as residential and light commercial many times the owner or manager doesn't get another bid and just goes with you because of the referrals and personal admiration, thanks!
Good dialogue here! So true on both ends lol
I hear American standard got those pull off coils. Or undue the fastner, and pull off the coil. Either way, the have "suicide door" technology O.o
you explain very well. ive been in the field for 14 yrs and still watch your vids. throwing in delta for confirmation is always good practice
How do you get the delta ?
Thanks man, I love these service call videos. I'm applying to be an apprentice, so I'm devouring your videos.
I love your videos Man it's almost like I'm your Apprentice
JDT738126 i was just on a call today checking charge via subcooling and i gotta say his videos make my service calls soooo much easier once you comprehend everything he says. 👍
Thanks a lot JDT and Bryan! I am glad to hear they help!
I enjoy the real service calls!!!!!
Glad to hear Steven! I just got in from some service calls and pms. Sometimes I can shoot a video and other times I can't depending on the customer, thanks!
Always enjoy watching your videos very informative
Glad you like them!
Really useful to hear you think it through. And the Start/Run analysis was a real bonus. Thank you.
Thanks NMranchhand!
This video was like being there. Great real life scenario!
This video has very important information on how troubleshoot, thanks
Thanks a lot Luis!
Love your videos, I just started in the Hvac field. Thanks alot
Awesome to hear MC!
Always visiting your channel great explanation and I've recommended the book to all of my amigos latinos they thanked me all the time about the great book of yours thanks for your cooperation to the trade my friend
That's awesome to hear, thanks Silvio!
I hope you teach Hvac also. I've been in business for 10 years and I've learned more from everyone's youtube videos than from school. Lol
Yes I teach High School and Adults at night HVACR, thanks!
Thank you!! Very informative and clear video.
Thanks Never g up!
Thanks for the info and the links to the tools used. Top shelf video once again.
Thank you very much Keith!
Very thorough and we'll explained. Really enjoyed this one.
Thanks
Thanks a lot Carlos!
Excellent acservicetech thank you for sharing!!!!!!
Thanks Jimbola77!
Nice reel sir
Awesome, thanks just starting to learn for my job
Great to hear!
Excellent Video, Thank you acservicetech !!
Thanks Milton!
Great explanation of the procedure. Thanks
Thanks Tomas!
You are a pro,nice posting!
Glad you enjoyed it Capitol!
I got all kinds of light bulbs going off right now thanks
As usual - very informative. I watched so many of your videos! In one of them you mentioned the formula to calculate the capacitance using voltage that coming in and some constant. I couldn't find that video! Could you post that formula again please! Thanks
2650 x amp draw / back emf
for a compressor:
2650 x compressor amps from herm terminal of capacitor / voltage from herm to common
Craig you are very creative and magical my friends call you a great Houdini. Great video.
Best regards from my friends.
King of Prussia
Pennsylvania
Ha ha, that is awesome, thanks Nurfet Alic!
love it! love your channel!
Thanks Boris!
Thank you will do. Please keep me informed about the book please thank you sir. I will be your 1st costumer.
Will do Ray Ray!
Thanks so much is a great help videos
Cool video
another great video.
Thanks H Sulli!
Your awesome this is sooo helpful
Thanks Brooklyn Droner!
Great video
Thanks TL Services!
I was curious as to why you where looking for an 18 to 21 degree temp difference between your indoor supply and return air? Is that just a typical difference you found in your experience, or is that a specific number found in the manual or something?
What is the tube coming off the suction line at the manifold gauge ?
I also learned 17-21F @ NHTC air temp
Cool and glad to hear!
Thanks again
Thanks Saeed!
I wonder if you have any advise on books or cds with learning material I can get?
Give me about a month and I will have a book out on refrigerant handling. You could look at Esco inst for their selection of topical paperbacks, thanks
Do you want to learn HVAC ? I will help you
I think Trane is the best units,what do you think?Thanks nice video
From a service standpoint, there are many times when I am not happy with any of them. I find that techs happen to like the systems that their company sells. I think it just has to do with the pride of a job well done in our installations and the equipment manufacturer that we are using. Thanks Chad!
hate to hurt your feelings chad but i work on just as many tranes as goodmans,trane puts to much ''i feel'' non essential crap needed for a residential heat pump,i do say i like the way they put the txv and rev valve outside the coil v/s in the unit but i cant stand the spiny coils,goodman too has issues but i think is a down to earth unit,either case they feed my family and after all they are man made,and like acservicetech said most techs are opinionated towards what their company promotes,i work for a maintenance company as a service tech and work on everything from the 90's to present and 2 of the biggest pains i see are trane and carrier
Carrier from a service standpoint, very close runner up is Rheem. But ultimately, it just depends on what company put it together and even more importantly, Who installed it.
What is the ~6" brass cylinder attached to your suction side Guage Set?
jd dr.jkindle Thats for when your charging as a liquid, normally you open and close slowly so you dont dump liquid into the compressor that cylinder i believe helps it convert into a vapor so you can charge quicker n protect the compressor as well.
Yepper - that is what I do, barely crack open and close the incoming Freon into the suction side... not to slug the compressor.
Thanks everyone.
Yes, I use that to be safe and I can weigh a lot of refrigerant quickly without fear of liquid getting into a compressor. Yellow Jacket makes a small orifice one but it is no comparison to these. I love these vaporizers. Thanks all!
The type of recovery machine I have linked in the description section works just like an impeller for a water pump but for higher pressure refrigerant. It does not matter if liquid or vapor goes in and it does not help cool the motor. The older ones worked like a small refrigeration unit and were different, thanks.
Did you check resistance before reusing the contactor or did you only perform a visual inspection?
I would think I would have pulled the wires and checked resistance while the 24v sucked in the contacts but that service call was a long time ago to remember. If it had a high resistance reading, that could have caused the problem, thanks!
when doing these videos remember im new to this so what are you putting your metering device set to to measure this?
Ncg for the basics look in the search "acservicetech superheat playlist" and acservicetech subcooling playlist"
your resistance readings totaled 1.9 ohms. how much variance can you have before you condemn the compressor?
If you saw 15 or 20 percent off then time to get the megger out or check again with another multimeter. Most times this reading will be right on or off completely. Thanks
Depending on the type of compressor be it 1 PH or 3, single phase or three phase: a single phase compressor will have 2 windings add up to the C or common terminal. Or even easier, C will have the highest resistance, next will be S for start, and lastly R for run.
If it is a 3 phase compressor each terminal will have the same resistance.
Max difference of whatever you feel comfortable with (check amps and voltage imbalance for 3 phase).
Last check is to ground. Simply scratch the compressor casing and test each term with the beeper, you get nothing, you're in the clear.
Great video! When checking the Delta T inside, do you check in the return plenum and supply plenum ? Or do you do it at the return grill and supply grill?
You will get your most accurate measurements in the return and supply plenum but you can read the return and supply at the registers if the length from the plenum is very short, thanks!
Did you discharge the capacitor or worked with it charged.
I disconnect, discharge and test capacitance. That is how I teach. I don't want students testing while the amperage is being drawn, thanks Noah!
acservicetech where do the high and low pressure switches in condenser go connected to? I noticed not connected thanks partner.
low- Low side inlet of the compressor, high- discharge from the compressor or possibly after the condensor coil. Thanks
Another great one, Craig. Is there no code requirement for the line side 240 AC coming into condenser from disconnect switch to be hooked to the top of the contactor? Coming from industry (not HVAC) background, we always put line side power on top of devices.
Almost every 5 ton and lower packaged or split comes with the line tap to be connected on the lower side. I don't believe so Jack, thanks!
you must be in a commercial/industrial environment where most all power drops down from overhead which would be logical to go to top
thanks sir jee
Thank you!
acservicetech just had a question for you I have a 3 1/2 ton condenser piston with a 4 ton furnace? cuts out? then when I reset thermostat it comes back on? 1200 Sq foot mobile park home can you give me a tip? thank you.
Unfortunately, I will need more info on that. What are the pressures, what exactly is shutting off, is it do to pressure switches or just low voltage? Cutting out condensor only or everything?
And glad to help, just need more details, thanks
reset the thermostat?type with a reset button on the thermostat?if so i would start with replacing the thermostat if it works otherwise,doesn't trip a breaker or pop a fuse?
Can I use clips of your Video in a slideshow presentation for my HVAC class?
Can you email this question to the update section at acservicetech.com?
acservicetech the thermostat was flashing I just noticed there is no common only batterries I changed them I will see how it goes I will let you know the outcome thank you sir for your help!!!!
Ok thanks
what caused the wire to burn?
I believe, bad connection and dissimilar metals connected.
Electricity is constantly passing over the metal connected, as well as air, and the two ultimately killers: sunlight and moisture. Sunlight, not so much in that location, but moisture very bad. Constant loading from stopping and starting, dirt increasing system load and amps, sunlight and moisture increasing oxidation and corrosion.
Orrrrrrr, like all the good techs I know would say, "wear and tear".
i dont understand why what condenser subcooling has to to with a txv?
Hey Marty, We need to know if the unit has a txv because then we check with subcooling. If the system has a piston orifice or a capillary tube then we need to check with superheat. The txv controls the superheat so that is why we dont check a system with a txv in superheat. There is no other way to really check a comfort cooling system besides by weight. That 30, 25, 20 plus rule is just a rule of thumb or generality and will get you close but not precise. thanks!
acservicetech i come from mostly refrigeration backgound i use the low side of the sytem alot more to trouble shoot. i might do seasonal a/c work when i retire.
You have 10 degrees of subcooling, why would you want a higher difference between the return air and supply air? You said between 12 and 18 degrees.
If I had 10 degrees of subcooling, the delta t measurement of 18-21 across the evap coil would be a double verification of the system properly working, thanks
original partner just sitting in unit not hooked up? I was over the road, when it was installed big mess.
I am having a hard time understanding this one.
Great video but a Megger gives a more accurate picture of the compressor
You are right, thanks for the comment!
acservicetech most customers dont care about a mega ohm reading especially if the compressor is running.
Thanks Marty!
You never started by showing us FIRST what you turned your multimeter to! What is it turned to???? I can’t see the details on your multimeter!!! NOT HELPFUL for us newbies.
Thanks so much is a great help videos
Thanks Felix!