-Join our updates list for an email strictly from us for new videos, articles, products and website features! www.acservicetech.com -Our Website has FREE Videos, Calculators, Podcasts, Articles, Tips, Quizzes, Q/A: www.acservicetech.com -Facebook Tips: facebook.com/acservicetech -Tools we use, Our Book, Workbook, and Quick Cards: www.amazon.com/shop/acservicetech -Our E-book, Paperback, Workbook, Quick Cards, Powerpoint, www.acservicetech.com/ac-book -Our E-book: play.google.com/store and search "ac service tech" -Spanish Book & E-book: www.acservicetech.com /store
Awesome! Finally, someone that can talk you through the whole system and procedure flawlessly and they're easy to follow! Kudos on making a great teaching video where each word is understandable!
Because it fluctuates depending on indoor / outdoor temps . Maybe after removing analog gauges and attaching digital ones outdoor indoor temps weren’t exactly the same etc
Great channel Craig, I am a mature student after many years as a plumber and a move from the UK to Australia I have moved onto HVAC, my question. Do you have any plans to do a metric version of the book ?
I have replaced a heat pump compressor(2ton) that had r-22 and i filled it with mo-99... replaced filter dryer, did a nitrogen pressure , pulled a good vacuum... the evaporator is a fur down unit (pancake) i checked both piston... blowers are ok ..the problem I have is that the compressor making a hissing noise, Low side 115 psi , 15 sh , vsat 71.4 , slt 86.3....hi side 168, -OL sc (no subcooling), 85 LSAT , 86.6LLT....had a a/c company called in and said was the valves 🤔 went ahead a replaced it with another compressor same problem no enough super heat/no cooling properly... Did replaced filter from the beginning...coils inside evaporator and condenser clean. I KNOW THERE'S A PROBLEM BECAUSE NO COOLING PROPERLY/HAVE USED DIGITAL AND ANALOG GAUGES BUT DON'T HAVE PROPER READING...I HAVE OVER CHARGE AND UNDER CHARGE IT ON PURPOSE TO SEE BUT CAN'T FIGURE IT OUT....
Craig, I wish you explained in this video better to its listeners WHY you are checking the WBT in the return at the air handler and not the DBT. So let me explain the missing info. You only check the WBT if the relative humidity is above 70% or below 20%. Anything in between you are to check the DBT at the return.
No. You can use the compound manifold gauge set (analog dial pressure gauges) and less expensive psychrometer to read the temps. No need for digital instruments.
I am trying to wrap my mind around what is happening to the gas if the SH is way low, I.e. you said "if low to 5 or so, we want to make sure we're not sucking liquid back too the compressor". So that would be overcharged robbing volume? causing a lack of space for expansion to take place?
I have a question if you have a 410a system with a txv and you have good temperatures like say 42 degree evap coil temperature and 11 degree SH and 8 degree SC but have low suction pressure of 95 psi and a head pressure of 305 psi is this a system that has issues like air flow or other problems
I got a question, why are all my wet-bulb temperatures below 49 degrees Fahrenheit. I'm taking my temperature right at my condenser return. Is that not what I'm supposed to take it from ?
We’ll sub cooling can tell you something also if you reading a piston system . Too high of a sub cooling can tell you it’s over charged so your next move would be to reduce sub cooling,
@@Sesamestreet9080 appreciate reply, but sub-cool method is for TXV system and superheat is for piston/ fixed orifice. And “I” find these scroll compressors to be very finicky and don’t last if not pretty much dead on. Oh well, he’s the sup, so it’s on his head, but man, in Deep South, summers are murder on units already, if a person is there working/ charging it…., why not simply do it correctly? 😖🤷♂️
@@bayouflats5054 definitely charge by superheat with piston, but knowing both will let you know what’s going on with the system , sub 6 on superheat means you’re flooding the compressor
On my old r22 system with a piston, is it true that if the vapor line temperature at the condenser is 41 degrees, (83 dry bulb for what it’s worth) the MOST my superheat can be is 9 degrees or so if my system is working properly? (Since the evaporator coil isn’t freezing, I took 41 and subtracted 32 to get 9). I have two 33 year old Armstrong air units and both work well. Clean coils, good air flow etc. I do not want to hook any gauges to them, there is just no reason. The downside of creating a schrader valve leak outweighs any knowledge I would get, since they are working very well. Delta T indoors is about 19 degrees which is just fine for me. I find this stuff very interesting. Thanks in advance.
Thanks for the effort you're making.learning with you makes me proud.i find it hard to understand all.wanna get rid of the French language.have a nice day.
GREAT VIDEOS OF YOUR THANK YOU SIR can you do video or share info about which refrigerant is best replacememt for R22 and what needs to be done when replacing refrigerant
I’m fresh out of HVAC school so this might be a stupid question but I believe I heard that if your suction line temp is 65 or above that it’s bad for the compressor or maybe it’s just Copeland compressors?
Hi Craig, I have a R410a unit - model # YCJD36S41S1, the unit pressure is 175 PSI when the unit turned off, do you know if this pressure is correct? Thanks
Please email us with a pic of the card to info@acservicetech.com and if you ordered it on amazon or our website and we can send you out a new one, thanks!
4 года назад
My address is 2408 Windridge Ct, Apt#1, Rockford Illinois 61108
I wonder if I could get your opinion on this r410a refrigerant My sub cooling is high, unit calls for 10-12 but it’s 18 (it’s a TXV system) super heat is .8-1.2 Temp split is 18-20 Suction line temp is 38-40 (118 psi) Liquid line temp is 75 (288 psi) Outdoor temp is 77 Indoor temp is 77 Blower is set to 400 cfm, 3 ton Filter, blower, evaporator, ductwork is all clean, all new units installed a few months ago
-Join our updates list for an email strictly from us for new videos, articles, products and website features! www.acservicetech.com
-Our Website has FREE Videos, Calculators, Podcasts, Articles, Tips, Quizzes, Q/A: www.acservicetech.com
-Facebook Tips: facebook.com/acservicetech
-Tools we use, Our Book, Workbook, and Quick Cards: www.amazon.com/shop/acservicetech
-Our E-book, Paperback, Workbook, Quick Cards, Powerpoint, www.acservicetech.com/ac-book
-Our E-book: play.google.com/store and search "ac service tech"
-Spanish Book & E-book: www.acservicetech.com
/store
Awesome! Finally, someone that can talk you through the whole system and procedure flawlessly and they're easy to follow! Kudos on making a great teaching video where each word is understandable!
Absolutely 💯
😊
Had a System today. 0 superheat 30 subcooling. Had to take out 1lb of refrigerant to get the superheat on point. I always use your chart.
They overcharged that unit Quite a bit
Why go to school when you can just watch this guy's videos? Awesome work sir.
Why were the digital and analog readings so different? Super heat on Analog was 14 and Digital it was 7.5. Why is that?
That's exactly what I thought, lol which would be more accurate?
Maybe look at the overall picture to determine?
Because it fluctuates depending on indoor / outdoor temps . Maybe after removing analog gauges and attaching digital ones outdoor indoor temps weren’t exactly the same etc
The I door wet bulb changed, shifting the readings
Finally i understand the super heat
Great video and explanation as usual !!
Glad you liked it!
Great channel Craig, I am a mature student after many years as a plumber and a move from the UK to Australia I have moved onto HVAC, my question. Do you have any plans to do a metric version of the book ?
Imperial is definitely confusing.
I have replaced a heat pump compressor(2ton) that had r-22 and i filled it with mo-99... replaced filter dryer, did a nitrogen pressure , pulled a good vacuum... the evaporator is a fur down unit (pancake) i checked both piston... blowers are ok
..the problem I have is that the compressor making a hissing noise, Low side 115 psi , 15 sh , vsat 71.4 , slt 86.3....hi side 168, -OL sc (no subcooling), 85 LSAT , 86.6LLT....had a a/c company called in and said was the valves 🤔 went ahead a replaced it with another compressor same problem no enough super heat/no cooling properly...
Did replaced filter from the beginning...coils inside evaporator and condenser clean.
I KNOW THERE'S A PROBLEM BECAUSE NO COOLING PROPERLY/HAVE USED DIGITAL AND ANALOG GAUGES BUT DON'T HAVE PROPER READING...I HAVE OVER CHARGE AND UNDER CHARGE IT ON PURPOSE TO SEE BUT CAN'T FIGURE IT OUT....
Check filter driet
Is the indoor wet bulb temperature just a reading of the temperature inside the return ? Or is a special tool required to calculate it ?
Craig, I wish you explained in this video better to its listeners WHY you are checking the WBT in the return at the air handler and not the DBT. So let me explain the missing info. You only check the WBT if the relative humidity is above 70% or below 20%. Anything in between you are to check the DBT at the return.
Thank you for explaining the info. It really did help a lot. Keep at it man. You're the best
So basically you need those fancy tool's 😁 Great video 👍✌️
No. You can use the compound manifold gauge set (analog dial pressure gauges) and less expensive psychrometer to read the temps. No need for digital instruments.
I am trying to wrap my mind around what is happening to the gas if the SH is way low, I.e. you said "if low to 5 or so, we want to make sure we're not sucking liquid back too the compressor". So that would be overcharged robbing volume? causing a lack of space for expansion to take place?
Thank you. After being on the field and shadowing this makes so much more sense !
I have a question if you have a 410a system with a txv and you have good temperatures like say 42 degree evap coil temperature and 11 degree SH and 8 degree SC but have low suction pressure of 95 psi and a head pressure of 305 psi is this a system that has issues like air flow or other problems
Michael Dreves
Take your readings again. Something seems off. If you have a 95psi your coil would freeze. 95psi is a 28° evaporator temperature.
are those digitals accurate! do u need to calibrate them? thanks.
1. how to find target superheat for single split aircond R32 in Celcius
2. do u hv chart for it
Excellent vid!!!! thanks, Craig.
Glad you liked it!
Great Video. Have a nice weekend . Thank you for sharing ^_^
Thank you! You too!
Great video. 👍👍
Thanks for the visit
What tool are you using for temps?
I got a question, why are all my wet-bulb temperatures below 49 degrees Fahrenheit. I'm taking my temperature right at my condenser return. Is that not what I'm supposed to take it from ?
new subscriber, your video really helps me. better than SJ*C school
Happy to hear that!
AC Service Tech LLC do you have a video for a walk in cooler? thanks
Thanks. What happens when a fellow employee insists on charging by sub-cool method on systems with pistons ?
We’ll sub cooling can tell you something also if you reading a piston system . Too high of a sub cooling can tell you it’s over charged so your next move would be to reduce sub cooling,
@@Sesamestreet9080 appreciate reply, but sub-cool method is for TXV system and superheat is for piston/ fixed orifice. And “I” find these scroll compressors to be very finicky and don’t last if not pretty much dead on. Oh well, he’s the sup, so it’s on his head, but man, in Deep South, summers are murder on units already, if a person is there working/ charging it…., why not simply do it correctly? 😖🤷♂️
@@bayouflats5054 definitely charge by superheat with piston, but knowing both will let you know what’s going on with the system , sub 6 on superheat means you’re flooding the compressor
Does the digital manifold connect with the job link prob compared to the dual in duct psychrometer?
Exactly where does the psycrometer needs to be place on the evaporator coil to find the temperature can it be place just outside the box
On my old r22 system with a piston, is it true that if the vapor line temperature at the condenser is 41 degrees, (83 dry bulb for what it’s worth) the MOST my superheat can be is 9 degrees or so if my system is working properly? (Since the evaporator coil isn’t freezing, I took 41 and subtracted 32 to get 9).
I have two 33 year old Armstrong air units and both work well. Clean coils, good air flow etc. I do not want to hook any gauges to them, there is just no reason. The downside of creating a schrader valve leak outweighs any knowledge I would get, since they are working very well. Delta T indoors is about 19 degrees which is just fine for me. I find this stuff very interesting. Thanks in advance.
41 degrees makes sense. Yes . Depends on the other variables
Thanks for the effort you're making.learning with you makes me proud.i find it hard to understand all.wanna get rid of the French language.have a nice day.
Great video! Thank you 👍
Glad you liked it!
Can you tell me that r134a and r404 gas target superheat chart. -temperature and +temperature are both gas.
Good beard! But! Craig, you are still young. Without it, you will look even better.
Would you get the same wet bulb temp reading at the return air vent and in the duct-work??
Hey Craig, can you do a video on how to check sub cooling and super heat on packaged units please
This is awesome 👌 thank you!
You're so welcome!
Sir pls do u have a book
Good Morning, We have a Paperback - Refrigerant Charging and Service Procedures for Air Conditioning on our website! www.acservicetech.com/store
Very useful information thanks dear
Gz... HOW LOW IS THE VAPOR LINE TEMP GOING TO GO 😆😂
Can you take the IDWB temp at the main return?
👍👍👍
That card your holding.
Super great!!
Thank you! Cheers!
GREAT VIDEOS OF YOUR THANK YOU SIR
can you do video or share info about which refrigerant is best replacememt for R22 and what needs to be done when replacing refrigerant
407c has similar pressures, I’d change the filter drier and install a 407c txv
i just ordered some of those charts !
I’m fresh out of HVAC school so this might be a stupid question but I believe I heard that if your suction line temp is 65 or above that it’s bad for the compressor or maybe it’s just Copeland compressors?
If refrigerant is low, oil that's supposed to lubricate compressor will get pumped out and into lineset
Flip hot and neutral, please. The fan is blowing in the wrong direction.
Thats just what it looks like on video. everything is correct!
You guys are the best😊
Do yall have an app
Can these two parameters also be used in the AC car service?
for r134a?
Hi Craig, I have a R410a unit - model # YCJD36S41S1, the unit pressure is 175 PSI when the unit turned off, do you know if this pressure is correct? Thanks
Depends on outdoor temp. It will change pressure in an off unit
The cards they sent me have a smudge mark across the 80 degree mark it looks like green paint. I tried to scratch it of but it made it worse
Please email us with a pic of the card to info@acservicetech.com and if you ordered it on amazon or our website and we can send you out a new one, thanks!
My address is 2408 Windridge Ct, Apt#1, Rockford Illinois 61108
👌
I wonder if I could get your opinion on this
r410a refrigerant
My sub cooling is high, unit calls for 10-12 but it’s 18 (it’s a TXV system)
super heat is .8-1.2
Temp split is 18-20
Suction line temp is 38-40 (118 psi)
Liquid line temp is 75 (288 psi)
Outdoor temp is 77
Indoor temp is 77
Blower is set to 400 cfm, 3 ton
Filter, blower, evaporator, ductwork is all clean, all new units installed a few months ago