I'm sure I've said it before, but thanks for all the great free information you and all the other great teachers provide. Such a wealth of knowledge. I'm 58 and I absolutely hated high school. Until I got into the trades. Then surprisingly I became an "A" student. I seriously love the trades and think its a great alternative to a four year college. My grand daughter is 15 and wants to become a welder. She makes me proud. Once again, thanks. Phil
Awesome explanation but … the label on the unit says indoor TXV with 10 deg F sub cooling. You say it has a fixed orifice so you’re using the superheat method - am I a missing something here?
Yes so the outdoor unit will always tell you the subcooling if a txv is used. However, as you can see through that plexiglass at the indoor unit, there is a piston there and not a txv. Single stage outdoor units can be installed with any combination of indoor units and metering device, thanks! To learn more check out our books at acservicetech.com !
need tips and tricks to determine if a system has a piston or txv. Sometimes on UNCASED coils it is impossible to remove the front of the field made cover to get a look.
Also check the chart on the condenser. It usually (but not always) tells you what the pressure of one of the lines should be which should match up to the metering device used
I have a question is it necesarry to use a imperial quick charge to charge R410a is ot sny quicker when using it .or just charging without it is just as quick
What was the recommended amount of refrigerant on the name plate? How much was in system at the start and what was the total amount at the rnd of this demonstration?
I don't understand how taking a low pressure (vapor line) reading at the condenser translates to the pressure in the evaporator. Why is it not industry standard to take low pressure (vapor line) reading at the evaporator?
@@8799crosby So we are measuring total super heat temp using thermometer near the service port at the condenser (outdoor unit for heat pump) and measuring the pressure at the same service port to measure the temperature at the evaporator (indoor unit for heat pump). We measure pressure to convert to temperature. If we are measuring the temp and the pressure at the same spot, why don't the temp readings match? I'm trying to understand the physics behind this. Does it have to do due with saturation temp, sensible heat, latent heat?
@@mtbbiker6401good question. The pressure on the low side is essentially the same in the evaporator as it is at the low side service port. The vast majority of the cooling is due to the liquid to vapor phase change in the evaporator coil. The additional heating of the 100% vapor is the superheat. You want there to be some superheat to prevent liquid refrigerant from entering and damaging the compressor.
If system has leakage (r410a) and still remains some amount of refrigerant, let’s say 70-80% of total, should I recover all refrigerant from system and charge it with new or just add needed amount?
So you remove the schrader valve to do SH or SC? Or what kind of removal tool do you use that has a press tool built in? Because the Appion that I use don’t have the press tool so I can’t take any risk of losing 5+ pounds of refrigerant by removing the schraders lol
@@emidiolopez1409if your loosing 5 lbs with a core removal tool you’re using it wrong. How much refrigerant are you going to lose I’d the schrader doesn’t seal?
@@HVAC_Tips_Tricks_Calcs Ive never said I’m losing 5 pounds by using the schrader removal tool. I said that’s just stupid if you have to remove the schrader valves every time you have to check the pressures on an AC, NO way I’m taking risks in losing factory refrigerant if something doesn’t goes bad with the removal tool.
I can see myself pulling the pressure probes off the T and accidentally letting out all the refrigerant. lol definately would put a valve core on that for me.
I use apion tee’s. They are low loss with schraders on both male ends of the tee. So doesn’t matter if you pull just the probe off. Or the tee with the probe.
sadly most techs will hook up and immediately say it's good or needs refrigerant because companies are so focused on getting techs in and out as fast as possible. Most expect a complete diagnosis to be complete in 30 min max preferably less.
The liquid side is at a high pressure while the system is running. Connecting the refrigerant jug to the suction line, which is a lower pressure, will suck the refrigerant into the system.
I'm sure I've said it before, but thanks for all the great free information you and all the other great teachers provide. Such a wealth of knowledge. I'm 58 and I absolutely hated high school. Until I got into the trades. Then surprisingly I became an "A" student. I seriously love the trades and think its a great alternative to a four year college. My grand daughter is 15 and wants to become a welder. She makes me proud. Once again, thanks. Phil
The best aircon video in TH-cam ❤
This guy is a bad dude ! Always on point !
absolutely instructional keep up the good work
Great video, I have Testo probes and a slightly different app but it is all the same in the end :)
Excellent video Craig. I do love my fieldpeace probes.
I bought those probes. I don’t have the manometers yet tho. Some day I’ll get what I need to do my job properly.
@acservicetechchannel Craig, correction to your statement: 75F as our *outdoor* dry bulb... 😊 8:47
great explanation thanks
I like using core depressors so I don't need to spin on/off quickly.
Excellent! You need to do this method to ac split unit also! Appreciate your effort teacher! ❤️❤️❤️❤️
This is a ac split unit
This doesn't work on mini split ductless if that's what you mean
Thank for the video, the effort and time you put in make the world a better place to leave in.
Use Appion charging tees. This is my go to charge set up. Also, get a third probe and map to outdoor air temp.
Well explained! Thank you very much 😊
Well explained ❤
Great video thank you for spending the time
Great video, thank you!!
Can you please make a video on where to connect probs on package unit correctly. Thank you!
I second this
Supply & return duck lol@@cryptkeyper
Nice job, Craig!
Thanks. Nice job.
Excellent video as always, thank you.
Great video man!
Great video!
Awesome explanation but … the label on the unit says indoor TXV with 10 deg F sub cooling. You say it has a fixed orifice so you’re using the superheat method - am I a missing something here?
Yes so the outdoor unit will always tell you the subcooling if a txv is used. However, as you can see through that plexiglass at the indoor unit, there is a piston there and not a txv. Single stage outdoor units can be installed with any combination of indoor units and metering device, thanks! To learn more check out our books at acservicetech.com !
Yeah I caught that
The charging hose has air when you hooked it up to the tee. The small space after the shutoff valve is dead air space. Needs a better setup maybe?
great vid
😮It's advisable to charge luguid in suction side.
need tips and tricks to determine if a system has a piston or txv. Sometimes on UNCASED coils it is impossible to remove the front of the field made cover to get a look.
I'm thinking one could tell by how fast the numbers move. Craig mentioned it might take 15 minutes for pressures to equalize with a fixed.
If you see a threaded union outside the case, chances are you got a piston.
Also check the chart on the condenser. It usually (but not always) tells you what the pressure of one of the lines should be which should match up to the metering device used
Great video 👌🏽
I have a question is it necesarry to use a imperial quick charge to charge R410a is ot sny quicker when using it .or just charging without it is just as quick
? What is the link for the brass tees to purchase sir. Thank You.
What was the recommended amount of refrigerant on the name plate? How much was in system at the start and what was the total amount at the rnd of this demonstration?
Craig. Does the outdoor Dry bulb temp matter if being read from the sunny side of the condenser vs the shady side?
Can I down load the calculation app ? And so what do need to do
Can you make a video on RTU’S?
It's the samething. What part confuses you?
Where can I buy those T’s that go on your probes do you have a link to them ?
multi zone split unit question. if you have 3 zones and 1 zone is having troubles meeting set temp. how does system respond.
Great video! Like always! Question can you provide a link for those AC test caps? I need to buy a set.
Just take two spare caps and drill a hole in them.
I don't understand how taking a low pressure (vapor line) reading at the condenser translates to the pressure in the evaporator. Why is it not industry standard to take low pressure (vapor line) reading at the evaporator?
There is no ports at the evap .
@@8799crosby So we are measuring total super heat temp using thermometer near the service port at the condenser (outdoor unit for heat pump) and measuring the pressure at the same service port to measure the temperature at the evaporator (indoor unit for heat pump). We measure pressure to convert to temperature. If we are measuring the temp and the pressure at the same spot, why don't the temp readings match? I'm trying to understand the physics behind this. Does it have to do due with saturation temp, sensible heat, latent heat?
@@mtbbiker6401good question. The pressure on the low side is essentially the same in the evaporator as it is at the low side service port. The vast majority of the cooling is due to the liquid to vapor phase change in the evaporator coil. The additional heating of the 100% vapor is the superheat. You want there to be some superheat to prevent liquid refrigerant from entering and damaging the compressor.
Because you want to be able to be in one spot
I've been flooding alot of compressors 😳
We all do. Sometimes when your busy. Lol
If system has leakage (r410a) and still remains some amount of refrigerant, let’s say 70-80% of total, should I recover all refrigerant from system and charge it with new or just add needed amount?
Hi mike!
This method doesn't always work with inverter variable speed equipment that change the superheat target based on various logics.
Inverters usually don’t have fixed orifices.
How hard would it be for Fieldpiece to add a wireless input for ODDB in the app or on the SMAN 380V?
You can link one of their psychrometer probes to the outdoor dry bulb
What if we add r32 to r410 system. Let say we add 30% r32 into it?
Iam a contractor and would like to do a course/training for a/c contractor. Can you recommend any in NY/NJ/PA area? Any schols?
I just use my valve core removal tool as my tee.
So you remove the schrader valve to do SH or SC? Or what kind of removal tool do you use that has a press tool built in? Because the Appion that I use don’t have the press tool so I can’t take any risk of losing 5+ pounds of refrigerant by removing the schraders lol
@@emidiolopez1409if your loosing 5 lbs with a core removal tool you’re using it wrong. How much refrigerant are you going to lose I’d the schrader doesn’t seal?
@@HVAC_Tips_Tricks_Calcs Ive never said I’m losing 5 pounds by using the schrader removal tool. I said that’s just stupid if you have to remove the schrader valves every time you have to check the pressures on an AC, NO way I’m taking risks in losing factory refrigerant if something doesn’t goes bad with the removal tool.
Espero este video en español
We need a way to use this in cars its 106 in Florida
I can see myself pulling the pressure probes off the T and accidentally letting out all the refrigerant. lol definately would put a valve core on that for me.
I use apion tee’s. They are low loss with schraders on both male ends of the tee. So doesn’t matter if you pull just the probe off. Or the tee with the probe.
@@lorunner1213 Yeah I love appion tools. Just purchased their recovery machine.
I didn't get probes yet probably next year.
Where did you bought those T’s ?
@@JuanJuarez-en5xnJohnstone Supply
Although I’m sure sponsored, nice to see someone make a video that didn’t say you had to use MQ and True Flow or you’re a hack.
🙏🙏🙏🙏
👍👍
👍👍👍👍👍👍👍👍👍👍👍👍👍
I thought this was a joke at first
What if my liquid pressures are at 390 and suction 174 with a 11 t/s !??
sadly most techs will hook up and immediately say it's good or needs refrigerant because companies are so focused on getting techs in and out as fast as possible. Most expect a complete diagnosis to be complete in 30 min max preferably less.
Preferably way less but every call is different. Only calls that really take time is determination of why a part failed.
😂why didn't you use a charging orifice
Why can’t you put the r410a into the liquid side if it’s coming in as a liquid
It would push refrigerant into your bottle
High pressure
The liquid side is at a high pressure while the system is running. Connecting the refrigerant jug to the suction line, which is a lower pressure, will suck the refrigerant into the system.
Usually to much pressure
It's leaving as a liquid
Great tips as always, thank you