I don't comment on every one of your vids but I have to say you're top notch. I've been at it 15 years and never seen the cap tube explanation you gave and how to ensure it is clear. Thanks man
As a light commercial/kitchen tech, this may be the most important video I’ve ever seen. (I started TH-cam watching with Dr. Z) Had manufacturers and service managers insist I change about cap tubes routinely. Thanks for the video. I’ve battled this in my head many times. Drier is just a screen style not a solid core?
question, how did you know there was a restriction in the system, I thought that if you add freon and the pressures drop(in this case the head pressure), that there would be a leak?
For whatever reason intermittent condenser fan failure, blocked condenser, people stacking things in front of the air inlet , great videos by the way I like your work
Good morning Have a question got a new wine cooler was running in a vacuum I changed the drier blew through the compressor cap tube was clear vacuum the system down to 435 it went up to 640 vacuum agine down to the same charged the unit (R600) and it still running in a vacuum any idea kind of stumped on this one Thanks for your time
If you are 100% sure the charge is correct, with the unit running, cut the cap tube where it goes into the evaporator coil. If no refrigerant comes out, the leak is before the evaporator coil (cap tube, dryer etc). If refrigerant comes out when you cut the cap tube, the restriction is most likely where the cap tube brazes into the evap coil.
@@REFRIGERATIONKITCHENEQTECH Good afternoon I went ahead and just changed the cap tube I blew out the old tube it seemed clear I was getting good flow this unit is R600. But all good now. Thanks for your help
Just curious how you determine the condenser split. Very well done videos. Im still learning the trade just started service calls and your videos are amazing
Unfortunately every manufacturer is different. Almost all new units are now a 15F Condensor split. A lot of China units are also 15F Condensor split. Most of the True units I work on are 30F split.
Awesome troubleshooting. Great vid. I'm from Philly n would like to c giroux win a cup. But I also wouldn't mind seeing n all Canada cup final. Leafs vs Edmonton or Calgary. Thanks again for sharing. 💪❄👍🇺🇸
Hey Brother tech from new Zealand here. Do you get the Evaporator TD from the manufacturer or is it something you can workout yourself? Also on one of your other videos you used the target superheat instead of Evap TD is that due to one being a TXV and the other being capillary?
I was at a job today and found a leak on a bullet accumulator in the evap area, fixed leak and did the whole 9 yards of proceedures 350microns vaccum, so when I charged 13.50oz what the unit says to charge I saw 1.4 suction and 97 head pressure this is a cap tube as well... something was very off. also the temp of the box was 66f and didnt come down. so I kept charging all the while had my Amp meter and it was well bellow rla on the compressor. I charged about 2 lbs in and the 3door lowboi unit was down to temp 36f... did I over charged this unit? or did I do the right thing ....? box is 36f and amps of the compressor is well below 9.6amps was around 7.12 amps with 2lbs of 134 charged well over the 13.50oz... am I missing something?
Is the unit critically charged or did it have a small receiver? Sounds like you have a potential restriction and suction pressure might go lower over time
@@REFRIGERATIONKITCHENEQTECH i believe its critically charged it did not have a small reciever, if it was a restriction it would go into a vaccum but this stayed at 23psi suction and 200 head pressure after i put in 2lbs of 134a and the low boi was 36f top and bottom... amps of compressor 7.1 when rla is 9.6... i think i did the right thing charging untill box was down in temp so as long as the compressor doesn't go over amps.... I also made sure that when i found the leak and fixed it.. i took suction side shrader valve off and blew nitrogen thru highside and made sure nitrogen came out the suction really well before i put it into a vaccum of 350 microns.....what do you think..?
The fact you have to exceed the charge by that much leads me to believe we are restricted partially. When blowing out the cap tube, we want to test the flow at operating pressure. In this case, around 14psi is when we want to see good flow out of the cap tube.
@@REFRIGERATIONKITCHENEQTECH thank you .. probably going to be a call back on that prep table then.. dammit hate my life. you live and learn no matter how good you are sometimes.
I am at the job now and fixed it , replaced it ,it was a restriction on the filter drier cap tube . when i did a vaccum first time around it was 350 mocrons but when i replaced the filter drier cap tub microns was 650 lol . thanks all
I don’t quite understand why a restriction on the metering device would give you low pressure on both sides. Why wouldn’t it give you high head pressure and low suction pressure since the refrigerant would be unable to push through the metering device.. that wouldn’t stack head pressure?
I kind of see what you mean, but even with a 10 oz charge, I would think head pressure would still be higher than normal if you’re suction pressure is in a vacuum and there is no leak. Sorry, I’m not understanding where that pressure is going.
That’s a big Condensor for 10oz so the head pressure will always show low during a restriction with a cooler with a cap tube system. I’ve gone as far as putting double the amount of the critical charge just to see what would happen and head pressure still doesn’t go up.
Excellent vid more than likely the restriction had to do with oil lodged in the cap tube dont see how anything else lodged in it and being blown out, having said that the possibility of oil logging you may have a small leak which caused the oil logging issues, blowing out cap tubes has never worked for me ilke your mythical way of troubleshooting👍
I did a nitrogen test after brazing, pressures did not drop. I’ve only had to change a handful of cap tubes, all the others I’ve blown out and been good after that. Sometimes the cap tube is a pain to change.
I don't comment on every one of your vids but I have to say you're top notch. I've been at it 15 years and never seen the cap tube explanation you gave and how to ensure it is clear. Thanks man
👍 we are all learning new techniques/more efficient ways of doing the job everyday
Best Chanel in the world for HVAC and refrigeration
I always learn something new whenever I look @ your videos. Good job.
👍👊
I like how you describe the problems, troubleshoot and explain how to solve the issue. I am really enjoying your videos. Thanks
👍
As a light commercial/kitchen tech, this may be the most important video I’ve ever seen. (I started TH-cam watching with Dr. Z)
Had manufacturers and service managers insist I change about cap tubes routinely.
Thanks for the video. I’ve battled this in my head many times. Drier is just a screen style not a solid core?
Yes, the dryer is an SUD111. I’ve changed maybe 5 cap tubes in over 10 years and I work on alot of reach ins.
I have a question, how do you know what TD split you're supposed to have?
question, how did you know there was a restriction in the system, I thought that if you add freon and the pressures drop(in this case the head pressure), that there would be a leak?
Hi Anthony quick question why you added 15 and not 30 to ambient as you usually do? Thanks for educating.
It all depends on what split the engineer uses for the Condensor. A lot of the newer stuff uses a 15F Condensor split
How would you find out if it’s 15 or 30 then ???
Is the 20 degrees TD across the evaporator typical for most cap tube calculations?
Yes
Good stuff man keep it up
👍
The coating in the compressor windings most likely gave way due to the blocked condenser
Never heard that theory before but makes sense
For whatever reason intermittent condenser fan failure, blocked condenser, people stacking things in front of the air inlet , great videos by the way I like your work
🙏👍
I have heard of this with carrier systems before. Copeland used to use a coating that broke down and clogged txv's, but never admitted to it.
Good to know
Will you use the solvent agent while flushing the cap tube ?
Nitrogen
Good morning Have a question got a new wine cooler was running in a vacuum I changed the drier blew through the compressor cap tube was clear vacuum the system down to 435 it went up to 640 vacuum agine down to the same charged the unit (R600) and it still running in a vacuum any idea kind of stumped on this one Thanks for your time
If you are 100% sure the charge is correct, with the unit running, cut the cap tube where it goes into the evaporator coil. If no refrigerant comes out, the leak is before the evaporator coil (cap tube, dryer etc). If refrigerant comes out when you cut the cap tube, the restriction is most likely where the cap tube brazes into the evap coil.
@@REFRIGERATIONKITCHENEQTECH Good afternoon I went ahead and just changed the cap tube I blew out the old tube it seemed clear I was getting good flow
this unit is R600. But all good now.
Thanks for your help
Just curious how you determine the condenser split. Very well done videos. Im still learning the trade just started service calls and your videos are amazing
Yes please elaborate
Unfortunately every manufacturer is different. Almost all new units are now a 15F Condensor split. A lot of China units are also 15F Condensor split. Most of the True units I work on are 30F split.
True 134 and 290?
How do you find the condenser split ? On the name plate, the manifact specs ?
14 psi woud be when the box temp is 34 degree , if the box temp was at 45 shoud my pressure be around 22 psi?
Not on a cap tube system, it should always be more or less the same pressure. On a system with a TXV it would in theory work like that.
Awesome troubleshooting. Great vid. I'm from Philly n would like to c giroux win a cup. But I also wouldn't mind seeing n all Canada cup final. Leafs vs Edmonton or Calgary. Thanks again for sharing. 💪❄👍🇺🇸
I’ll take anyone over the leafs lol. Unfortunately i don’t think Giroux will one just like my boy Price.
@@REFRIGERATIONKITCHENEQTECH HABS get #1 pick congrats 👏
How do you know when to use the ambient +30 method vs the ambient +15
Unfortunately it depends on the manufacturer. Most new equipment is a 15F split.
Hey Brother tech from new Zealand here. Do you get the Evaporator TD from the manufacturer or is it something you can workout yourself? Also on one of your other videos you used the target superheat instead of Evap TD is that due to one being a TXV and the other being capillary?
Yes, evap TD is generally 20F for reach ins and 10F to walk ins. If there is a TXV, the superheat will determine your evap TD.
I was at a job today and found a leak on a bullet accumulator in the evap area, fixed leak and did the whole 9 yards of proceedures 350microns vaccum, so when I charged 13.50oz what the unit says to charge I saw 1.4 suction and 97 head pressure this is a cap tube as well... something was very off. also the temp of the box was 66f and didnt come down. so I kept charging all the while had my Amp meter and it was well bellow rla on the compressor. I charged about 2 lbs in and the 3door lowboi unit was down to temp 36f... did I over charged this unit? or did I do the right thing ....? box is 36f and amps of the compressor is well below 9.6amps was around 7.12 amps with 2lbs of 134 charged well over the 13.50oz... am I missing something?
Is the unit critically charged or did it have a small receiver? Sounds like you have a potential restriction and suction pressure might go lower over time
@@REFRIGERATIONKITCHENEQTECH i believe its critically charged it did not have a small reciever, if it was a restriction it would go into a vaccum but this stayed at 23psi suction and 200 head pressure after i put in 2lbs of 134a and the low boi was 36f top and bottom... amps of compressor 7.1 when rla is 9.6... i think i did the right thing charging untill box was down in temp so as long as the compressor doesn't go over amps.... I also made sure that when i found the leak and fixed it.. i took suction side shrader valve off and blew nitrogen thru highside and made sure nitrogen came out the suction really well before i put it into a vaccum of 350 microns.....what do you think..?
The fact you have to exceed the charge by that much leads me to believe we are restricted partially. When blowing out the cap tube, we want to test the flow at operating pressure. In this case, around 14psi is when we want to see good flow out of the cap tube.
@@REFRIGERATIONKITCHENEQTECH thank you .. probably going to be a call back on that prep table then.. dammit hate my life. you live and learn no matter how good you are sometimes.
I am at the job now and fixed it , replaced it ,it was a restriction on the filter drier cap tube . when i did a vaccum first time around it was 350 mocrons but when i replaced the filter drier cap tub microns was 650 lol . thanks all
Caps tubes can get a white little ring around the inside from 134a it's looks like wax.
That’s interesting. I have seen that white ring before
@@REFRIGERATIONKITCHENEQTECH I have un-sweated it used a cap tube cutter cut that off rebrazed and your good.
Awesome job 👍👍👍
👍👊
Hey I love the way you troubleshoot. Is that cycle chart a pdf or something you can share? I would like to use that to help visualize troubleshooting.
Email me rketech20@gmail.com and I’ll see if I can figure that out
Do you host an in person class?
At the moment, only for techs who work with me.
I don’t quite understand why a restriction on the metering device would give you low pressure on both sides. Why wouldn’t it give you high head pressure and low suction pressure since the refrigerant would be unable to push through the metering device.. that wouldn’t stack head pressure?
There’s only 10oz so it can’t really bump up the head pressure high enough. On bigger systems and A/C it would be different.
I kind of see what you mean, but even with a 10 oz charge, I would think head pressure would still be higher than normal if you’re suction pressure is in a vacuum and there is no leak. Sorry, I’m not understanding where that pressure is going.
@@babyking5763 I’m thinking the system didn’t have all 10 oz and was a bit low.
That’s a big Condensor for 10oz so the head pressure will always show low during a restriction with a cooler with a cap tube system. I’ve gone as far as putting double the amount of the critical charge just to see what would happen and head pressure still doesn’t go up.
Interesting.
Still trying to wrap my head around it lol.
Excellent vid more than likely the restriction had to do with oil lodged in the cap tube dont see how anything else lodged in it and being blown out, having said that the possibility of oil logging you may have a small leak which caused the oil logging issues, blowing out cap tubes has never worked for me ilke your mythical way of troubleshooting👍
I did a nitrogen test after brazing, pressures did not drop. I’ve only had to change a handful of cap tubes, all the others I’ve blown out and been good after that. Sometimes the cap tube is a pain to change.
Sir , please what the rules for head pressure teleprompter so time I see you added 30 degrees some time 25 , 15 Thank you so much
All depends on the manufacturer unfortunately. Most of the new stuff uses a 15 Condensor split
I recover and weigh how much is recovered. That's my way to know if its restricted or low
When there 6oz it’s really hard to weigh what was recovered, atleast I’ve had no luck with it.
You are a pipe boss