No one ever succinctly explained that. That is quite straight forward. I've taken classes in heat transfer and fluid flow in the military. So I've taken many engineering courses. Carnot diagrams and such. Good stuff.
@@acservicetechchannel I may be in the wrong spot but hoping I can get a answer I got a 2006 mazda 3s 2.3L auto sedan 335 k miles I have this problem the does car not over heating . Theonly part I have not changed is expansion valve and high and low sensors I charged up with 134a no leak filler shop said I need a new compressor and high line I replaced myself New parts Ac compressor new not rebuilt not China crap eather GPD Cooling fan Condenser Dryer High pressure line Water pump Thermostat Flushed radiator inside /ou coolant Expansion tank Cab filter What could it be?
Jose, check out our full illistrated video on how the TXV works, and also check.out our superheat method article and subcooling method article at www.acservicetech.com/articles thabks!
Craig, your videos are already top-notch. But when you post videos like this, giving the student a visual for him or her to better understand the audio, your teaching skills become labeled as 'phenomenal'. Please keep making videos like this! There are some of us who can hear you talk about it all day (and even show us how to perform certain tests); but when you show us examples like this one (a very simplistic, almost cartoonish example), it becomes so much easier to understand the process! Keep up the great work!!!
@@francisco1313ishwhat if it’s a package unit ?? You should be more concerned with where exactly on the suction line that bulb is sitting- on the top, bottom or sides.
Hey, would a lower super heat on an expansion valve mean colder AC? Compare to one with a higher superheat, I know its a risk for the compressor but would a lower superheat make an AC colder
Not by a significant amount. It takes much less energy to increase the temperature of a refrigerant (or anything) than it does to change its state. It only takes 0.2 BTU per pound of 410a to increase its temeperature by 1 degree, but it takes over 100 BTU to evaporate 1 pound of 410a. So decreasing the superheat will get you a handful of more BTU but it would be insignificant compared to the tens of thousands of BTU your system moves.
So what is the best SH number? 10-15 degrees? Just checked mine visually. Frosted after the metering device and room temperature coming out. Must be WAY high, like 70 degrees.
All my carrier coil at 23-25 superheat. At 8-10 subcool. If I charge to 12 superheat pressure goes up at least 20psi and subcool will be around 16. High side would have like 20 ctoa 😂😅
This is the only channel that explains HVACR as good as the $300 program my school pays for. Even better though since after each video I don’t have to take a mini test after each video and then take a test after each course.
Freezing on an air conditioner is caused by low suction pressure. After the coil is frozen there will be very little or no superheat because there is no airflow through the coil. The coil would have to be thawed and then check the superheat to figure out what is causing the low suction pressure issue. Low suction pressure can be caused by lack of airflow or lack of refrigerant flow. Low superheat is lack of airflow, high superheat is lack of refrigerant flow.
I saw my technician use a zip tie to secure the sensing bulb. I know most use a copper brace. Will the zip tide melt over time and cause problems.......
Both try to achieve super heat in evap coil but, when charging a system with a txv, sub cool must be used because txv constantly tries to meter the refrigerant level in the evap coil so you have to charge by the amount of refrigerant thats in the condensor. Which is where "sub cool" takes place.
Piston and txv are both metering devices that restrict the flow of refrigerant into the evaporator coil. You have one or the other. Unless you have a heat pump in which case you have two and some times one of each. One straight AC unit has one metering device. Piston, txv or now eev
For some reason this 60 second video makes more sense than weeks of studying a textbook chapter on superheat and subcooling
So true I can’t even believe how simple this was!!!!!!😂
Seriously lmao
Cuz like we lil ass grown adults, illustrated images make a whole lotta sense
Bro stg
@@paulgavian90real
This is the best and only perfect visual and explanation I’ve ever got for this for the past decade. Thank you
That is so encouraging!! That is exactly why we made this!!!
I'm so glad I found this channel. Helps me better understand HVAC related subjects so much more.
No one ever succinctly explained that. That is quite straight forward. I've taken classes in heat transfer and fluid flow in the military. So I've taken many engineering courses. Carnot diagrams and such. Good stuff.
Love picture it really helped me visualize superheat.
Thank you sir, Great simple and direct gem of information.
I really appreciate it!!!
@@acservicetechchannel I may be in the wrong spot but hoping I can get a answer
I got a 2006 mazda 3s 2.3L auto sedan 335 k miles
I have this problem the does car not over heating . Theonly part I have not changed is expansion valve and high and low sensors I charged up with 134a no leak filler shop said I need a new compressor and high line I replaced myself
New parts
Ac compressor new not rebuilt not China crap eather GPD
Cooling fan
Condenser
Dryer
High pressure line
Water pump
Thermostat
Flushed radiator inside /ou coolant
Expansion tank
Cab filter
What could it be?
Good stuff mate!
Concise ❤
Love these visuals!
thanks
Do one for subcooling!
Exits the evaporator at beer can cold 😎
So what are the reasons I’d check SubCool with TXV and SuperHeat with a piston coil?
You have to charge by subcooling with a TXV because the TXV tries to maintain a constant superheat, regardless of the charge.
@@ChcBrs85 Perfect. Thank you
Any tips ?
Jose, check out our full illistrated video on how the TXV works, and also check.out our superheat method article and subcooling method article at www.acservicetech.com/articles thabks!
How can I get one of these book from you sir
www.acservicetech.com/store or on www.amazon.com/shop/acservicetech thanks!
Is it possible to get saturation in this area and when will it occur?
Nope proper super heat proves 100% liquid, look at the sight glass
Craig, your videos are already top-notch.
But when you post videos like this, giving the student a visual for him or her to better understand the audio, your teaching skills become labeled as 'phenomenal'.
Please keep making videos like this!
There are some of us who can hear you talk about it all day (and even show us how to perform certain tests); but when you show us examples like this one (a very simplistic, almost cartoonish example), it becomes so much easier to understand the process!
Keep up the great work!!!
Justin, thats so great hear!!!
Sensing bulb is shown inside of evaporator cabinet. Should be outside just for clarification.
@@francisco1313ishwhat if it’s a package unit ?? You should be more concerned with where exactly on the suction line that bulb is sitting- on the top, bottom or sides.
@@francisco1313ish Wrong.
Same when melting an ice cube in water. You’ll have a latent temperature of 0 celcius untill the ice is melted
Craig,
I give this video a 10 on a scale of 1 to 10. The airflow going over the coil with the changing temperature is awesome.
Great description of true superheat. Generally as techs we’re checking total superheat. Good information. Maybe do a demonstration of total superheat.
Hey, would a lower super heat on an expansion valve mean colder AC? Compare to one with a higher superheat, I know its a risk for the compressor but would a lower superheat make an AC colder
Not by a significant amount. It takes much less energy to increase the temperature of a refrigerant (or anything) than it does to change its state. It only takes 0.2 BTU per pound of 410a to increase its temeperature by 1 degree, but it takes over 100 BTU to evaporate 1 pound of 410a. So decreasing the superheat will get you a handful of more BTU but it would be insignificant compared to the tens of thousands of BTU your system moves.
Just have to get an accurate temperature reading on the tubes.
Sir expension valve output and going to evaporator coil - temp ice formation good ya bad. Piz reply
-25 degree centigrade walk in frezzer problem expension valve output ice formation good ya bad
CHANGE THAT DIVERSITECH SWITCH they’re absolutely garbage
Is that gas R410A ?
Not even the union can explain that better. Amazing video 🍻
Thanks! 😃
So what is the best SH number? 10-15 degrees? Just checked mine visually. Frosted after the metering device and room temperature coming out. Must be WAY high, like 70 degrees.
I had to use this vid on a new manager that was military trained (not in HVAC) that tried to to school us techs
All my carrier coil at 23-25 superheat. At 8-10 subcool. If I charge to 12 superheat pressure goes up at least 20psi and subcool will be around 16. High side would have like 20 ctoa 😂😅
Great content Craig. Thanks for those videos.
This is the only channel that explains HVACR as good as the $300 program my school pays for. Even better though since after each video I don’t have to take a mini test after each video and then take a test after each course.
Boy I hated TXV’s. We used to change them out with an orifice
So is super heat the heat that is pick up in the coils form the medium one is trying to cool?
Can you do the entire system in that fashion?
Nice job, love your graphics!
Please good sir come tech in our class for a week please
-Wait, is it all just latent heat?
-Always has been
Where do you get the 36 degrees from?
This helped thanks!
TXV superheat
If evaporative coil freezes, does it mean there is no enough superheat ?
Freezing on an air conditioner is caused by low suction pressure. After the coil is frozen there will be very little or no superheat because there is no airflow through the coil. The coil would have to be thawed and then check the superheat to figure out what is causing the low suction pressure issue. Low suction pressure can be caused by lack of airflow or lack of refrigerant flow. Low superheat is lack of airflow, high superheat is lack of refrigerant flow.
TXV- dont u take subcool??
The TXV measures and controls superheat so we measure subcooling to measure the charge, thanks!
I saw my technician use a zip tie to secure the sensing bulb. I know most use a copper brace.
Will the zip tide melt over time and cause problems.......
What’s the superheat on a microwave
Similar to the superface on an oven!! Ha ha
🤣
Literally THE best video I have seen yet to explain what superheat is. Great straight forward illustration. Thank you.
Can you make a step by step how to clean indoor unit fully and out door unit fully by taking of everything from mini split air conditioner?
Clear and simple
I'd like to join your app I like to watch some of your videos tell me how to get on it
I love you guys. You guys are expanding my knowledge.
Please do more shorts like this on the best definitions/ examples on important key terms in the HVAC world
Perfectly explained... easy to understand for all.
Great video. Simple and straightforward. Appreciate it.
Glad it was helpful!
Used to call that cross evaporator coil differential .
Thank you 👍🏽 this is awesome
Can you make a short for SC?
Где русские субтитры😢
Very good explanation
Thank you for watching!!
Nice short!, however I thought the piston was the one that controlled superheat and txv did subcooling?
Both try to achieve super heat in evap coil but, when charging a system with a txv, sub cool must be used because txv constantly tries to meter the refrigerant level in the evap coil so you have to charge by the amount of refrigerant thats in the condensor. Which is where "sub cool" takes place.
Piston and txv are both metering devices that restrict the flow of refrigerant into the evaporator coil. You have one or the other. Unless you have a heat pump in which case you have two and some times one of each. One straight AC unit has one metering device. Piston, txv or now eev
Now please make one just like that for Subcooling.