Thank you for incredible video, my question to you is, what do you do if the information on the target subcooling or superheated is not available on the rating plate, is there any other way to figure it out? Thanks
I think yes by far ive been watching this videos if the super heat is too large n subcooling is too low then you are under charged n vise versa you are overcharged
Since most installers in the field do not remove the bulb when brazing and protect the txv properly, might not be a bad idea to do this again with examples as to why your SC is spot on but your total superheat is at 30°f.. Or 2°f lol.. Airflow also is super critical. How about zoning systems? Fancy communicating, full VFD zoning systems lol. Very seldomly are these systems going to be cookie cutter. Knowing how to charge and understanding why pressures/Temps act like they do are two completely separate things but it's an hvac techs job to know these things well so they can quickly diagnose and resolve the issue. Most I've worked with or behind simply shrug it off as a working system.. The SC is where the manufacturer specified it should be for 95°f oa° but the SH is at 28° or below 5° so it must be fine right? Lol, No 👎 it's not fine. Your coil is still starved at over 15° of superheat or flooded below 10° and you're actually causing compressor damage below 5° of sh. These days on most systems the systems will reach what we call "equilibrium." Your subcooling and superheat will both mirror one another. If you can reach equilibrium, your system is a straight gangster and will do its job at 100% capacity with wonderful latent heat removal. Txv's are extremely sensitive devices. They should be treated as such and protected, it will make your job much easier.
Why on the subcooling app say "add refrigerant. If I have, 112 sat temp and 92 line temp. With these temps. I have 20F of subcooling, and i am looking for 10F of subcooling. But, I press "Calculate" and it shows: "ADD REFRIGERANT"
You would need to pressure test with nitrogen and listen for where the leak is in order to fix it. If you can't hear it, use Big blue leak detector on the joints. Look for oil stains from a leak in the unit, thanks.
Do you have vids with 407c? Im replacing r22 ac condensers with r410a condensers and swapping out the refrigerant with 407c since customers can't afford to change the evap coil. Scenario: 3.5T eq. #78 piston. 100° OAT 245 Hi 82 Lo. 20 SH 5 SC. Inside temp 80°. Amp draw of 8A. TD 17° 81R/63S. Seems close. What you think? I know by leaving the evap, it's mismatching the seer.
@@abarenas Please explain how so? I've called various tech supports and they can't give me a valid technical answer. Their answer sounds robotic and trying to push product. As mentioned, only doing this cause customers can't afford to swap both evap coil and condenser. So give me a valid technical answer cause at this point, I haven't had a call back on any install done this way.
By far the best channel on RUclips, thanks Craig!
Excellent content! I purchased your book 2 weeks ago and I’m not even a service tech 😂.
Awesome! Thank you!
Apologies, just saw you have other videos dedicated to teaching about restrictions and txv trouble. Great content man
simply the best!!!!! thanks, Craig for sharing I love the book I go through it day to day.
Glad you enjoy it!
dang, I don't understand how someone can give a thumbs down? this is really good stuff!!!!.
Thanks, for making it so straightforward.
As usual excellent video. Why to mention piston diameter on ac name plate?
Thanks.
Thank you, you are blessing in the sky.
Wow, thank you
Muchísimas gracias, muy bien explicado, sin tantos embrollos, saludos desde Mexicali, BC, México
Great content and clear presentation!
Much appreciated!
I really enjoy your books. Thank you so much.
You are so welcome!
always great info thanks
Our pleasure!
Thank you for doing what you do!
My pleasure!
Another great one, Craig. Thanks
You never miss! 👍🏾
If there is no data plate to read how do you find your sub cool target
Thank you for incredible video, my question to you is, what do you do if the information on the target subcooling or superheated is not available on the rating plate, is there any other way to figure it out?
Thanks
I think yes by far ive been watching this videos if the super heat is too large n subcooling is too low then you are under charged n vise versa you are overcharged
Do the system have to be running or does it need to be off
🙏 👏 🙏 Thank you so much
You're most welcome
great information
Glad it was helpful!
Since most installers in the field do not remove the bulb when brazing and protect the txv properly, might not be a bad idea to do this again with examples as to why your SC is spot on but your total superheat is at 30°f.. Or 2°f lol.. Airflow also is super critical. How about zoning systems? Fancy communicating, full VFD zoning systems lol. Very seldomly are these systems going to be cookie cutter. Knowing how to charge and understanding why pressures/Temps act like they do are two completely separate things but it's an hvac techs job to know these things well so they can quickly diagnose and resolve the issue. Most I've worked with or behind simply shrug it off as a working system.. The SC is where the manufacturer specified it should be for 95°f oa° but the SH is at 28° or below 5° so it must be fine right? Lol, No 👎 it's not fine. Your coil is still starved at over 15° of superheat or flooded below 10° and you're actually causing compressor damage below 5° of sh. These days on most systems the systems will reach what we call "equilibrium." Your subcooling and superheat will both mirror one another. If you can reach equilibrium, your system is a straight gangster and will do its job at 100% capacity with wonderful latent heat removal. Txv's are extremely sensitive devices. They should be treated as such and protected, it will make your job much easier.
Thank you.
You're welcome!
Why on the subcooling app say "add refrigerant.
If I have, 112 sat temp and 92 line temp.
With these temps. I have 20F of subcooling, and i am looking for
10F of subcooling.
But,
I press "Calculate" and it shows: "ADD REFRIGERANT"
Dont use whatever app you have there then. its easy enough to not use apps if you dont have blend refrigerants with bubble and dew, thanks!
thank you teacher
Why em I getting over 500 psi when the unit is in the heat mode? This is a new unit ( 18000 BTU).
What is the proper procedure if all the r22 has leaked out. No pressure at all.
You would need to pressure test with nitrogen and listen for where the leak is in order to fix it. If you can't hear it, use Big blue leak detector on the joints. Look for oil stains from a leak in the unit, thanks.
Do you have vids with 407c? Im replacing r22 ac condensers with r410a condensers and swapping out the refrigerant with 407c since customers can't afford to change the evap coil. Scenario: 3.5T eq. #78 piston. 100° OAT 245 Hi 82 Lo. 20 SH 5 SC. Inside temp 80°. Amp draw of 8A. TD 17° 81R/63S. Seems close. What you think? I know by leaving the evap, it's mismatching the seer.
You're doing everyone a horrible disservice for doing that, please stop.
@@abarenas U got that right
@@abarenas Please explain how so? I've called various tech supports and they can't give me a valid technical answer. Their answer sounds robotic and trying to push product. As mentioned, only doing this cause customers can't afford to swap both evap coil and condenser. So give me a valid technical answer cause at this point, I haven't had a call back on any install done this way.
👍
🍇🥃😎👍🏻🍺☕