How EEV works - Electronic Expansion Valve working principle, HVAC Basics
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Date: 2023-11-17
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Comments and reviews: 21
Ed
Thank you for the video. Good explanation about EEV operation.
P. S. These EEVs might be a very precise tool to control SuperHeat. However, its not as reliable as a TXV. Last year, I had 2 HeatCraft walk-in freezers at Baskin-Robbins restaurants that were acting crazy, flooding the condenser, cooling poorly. One compressor that was only 4 years old has died. Had several calls to HeatCraft tech support; adjusting the SuperHeat reading/calibration on the control board, replacing sensors. Long story short, after a month of giggle-wiggle Ive got rid of these electronic controls and EEVs. Installed TXV, defrost timer and regular mechanical thermostats Its been almost a year now. Both customers are happy with -5F; -7F. No complaints.
Today, I ran into another walk-in cooler from HeatCraft. This one is a big evaporator with EEV and its acting the same way as those small walk-in freezers were doing; SuoerHeat hunting, flooding the condenser, suction line saturation temperature goes from 24F to 2. 1F in a minute or two and goes back to -22F Again, I will try to repmm m Ave the SuperHeat sensor as it was suggested by HeatCraft tech support. However, Ive got a feeling that it will end up with another TXV.
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Thank you for the video. Good explanation about EEV operation.
P. S. These EEVs might be a very precise tool to control SuperHeat. However, its not as reliable as a TXV. Last year, I had 2 HeatCraft walk-in freezers at Baskin-Robbins restaurants that were acting crazy, flooding the condenser, cooling poorly. One compressor that was only 4 years old has died. Had several calls to HeatCraft tech support; adjusting the SuperHeat reading/calibration on the control board, replacing sensors. Long story short, after a month of giggle-wiggle Ive got rid of these electronic controls and EEVs. Installed TXV, defrost timer and regular mechanical thermostats Its been almost a year now. Both customers are happy with -5F; -7F. No complaints.
Today, I ran into another walk-in cooler from HeatCraft. This one is a big evaporator with EEV and its acting the same way as those small walk-in freezers were doing; SuoerHeat hunting, flooding the condenser, suction line saturation temperature goes from 24F to 2. 1F in a minute or two and goes back to -22F Again, I will try to repmm m Ave the SuperHeat sensor as it was suggested by HeatCraft tech support. However, Ive got a feeling that it will end up with another TXV.
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Steve
Still not sure why you would use pressure when it's not needed. If you attach a thermistor at the outlet of the EEV and one at the outlet of the evaporator is that not true super heat? Following the refrigeration cycle if the outlet of the metering device is lquid vapor mix, then the refrigerant can not be super heated or sub cooled, and unless it's a Bose Einstein then in must be at boiling point, and any heat added to the refrigerant on the outlet side of the evaporator would be super heated by it's very definition. So why use a pressure transducer and then have a module simply convert it back to temperature any way. It's just one more thing to leak.
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Still not sure why you would use pressure when it's not needed. If you attach a thermistor at the outlet of the EEV and one at the outlet of the evaporator is that not true super heat? Following the refrigeration cycle if the outlet of the metering device is lquid vapor mix, then the refrigerant can not be super heated or sub cooled, and unless it's a Bose Einstein then in must be at boiling point, and any heat added to the refrigerant on the outlet side of the evaporator would be super heated by it's very definition. So why use a pressure transducer and then have a module simply convert it back to temperature any way. It's just one more thing to leak.
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oOGeekITOo
Hey there! Do you plan to make a series of videos about all kinds of motors - steppers, asyncronous, etc and their features in terms of practical usage and basic theory stuff such as moment of inertia, idling? I mean, you have some videos but it would be interesting to see a bit more above basic leverl topics in terms of your awesome explanations!
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Hey there! Do you plan to make a series of videos about all kinds of motors - steppers, asyncronous, etc and their features in terms of practical usage and basic theory stuff such as moment of inertia, idling? I mean, you have some videos but it would be interesting to see a bit more above basic leverl topics in terms of your awesome explanations!
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Mark
What a great presentation! But I fail to understand how this stepper motor driven device can produce more accurate results and more economical operation than a correctly installed and sized txv that has infinite control positioning. It appeared to me that the device would operate on predetermined levels, be it 10, or 100, I am unsure about that
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What a great presentation! But I fail to understand how this stepper motor driven device can produce more accurate results and more economical operation than a correctly installed and sized txv that has infinite control positioning. It appeared to me that the device would operate on predetermined levels, be it 10, or 100, I am unsure about that
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DumdeBear
Did I get it right, that the expansion valve uses pressure losses in order to reduce or increase massflow, so as a result the transfered heat to the ambient air is reduced or increased? Because if the area the fluid is flowing through is reduced, friction and therefor pressure losses increases.
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Did I get it right, that the expansion valve uses pressure losses in order to reduce or increase massflow, so as a result the transfered heat to the ambient air is reduced or increased? Because if the area the fluid is flowing through is reduced, friction and therefor pressure losses increases.
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Steven
Just wanted to stop by and thank you for these videos. As a newer HVAC tech, these videos have taught me SO much more than anyone at my company has been able to teach me. Can you please make a video on Hard Start Kits and the difference from maybe SureStart Soft Start kit?
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Just wanted to stop by and thank you for these videos. As a newer HVAC tech, these videos have taught me SO much more than anyone at my company has been able to teach me. Can you please make a video on Hard Start Kits and the difference from maybe SureStart Soft Start kit?
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Benjamin
Hey my EEV looks completely different from the types youve shown, so then Im having trouble visualizing how it works within my unit. Its more like a rectangular tube with a plates on it. See EEV (USDM Denso) for 1993 FD3S.
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Hey my EEV looks completely different from the types youve shown, so then Im having trouble visualizing how it works within my unit. Its more like a rectangular tube with a plates on it. See EEV (USDM Denso) for 1993 FD3S.
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Solo
please i have a problem with EEV error but i do not known the particular indoor unit, the system is Samsung VRF once the come all the unit will not work all the remote will shoe error 151 please help me thanks
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please i have a problem with EEV error but i do not known the particular indoor unit, the system is Samsung VRF once the come all the unit will not work all the remote will shoe error 151 please help me thanks
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drisya
Hi Paul, great video! Just one clarification: How this operation stops when the set temperature is achieved. Means How is it collaborated with the thermostat operation. ? Anybody please reply.
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Hi Paul, great video! Just one clarification: How this operation stops when the set temperature is achieved. Means How is it collaborated with the thermostat operation. ? Anybody please reply.
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Muhhamad
Hey paul, could you please make videos on Suction and discharge superheat? Your videos are way more detailed than any other videos available in Internet. I hope you this message.
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Hey paul, could you please make videos on Suction and discharge superheat? Your videos are way more detailed than any other videos available in Internet. I hope you this message.
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education
Nice video indeed! How does the EEV work with a system where you have 4-way valve to turn evaporator to condenser and vice versa? Heat pumps with heating and cooling.
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Nice video indeed! How does the EEV work with a system where you have 4-way valve to turn evaporator to condenser and vice versa? Heat pumps with heating and cooling.
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Bijoy
The best presentation I have seen so far on Split Air Conditioning System. Very lucid, explained with beautiful animations and graphics. Thanks for the video series.
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The best presentation I have seen so far on Split Air Conditioning System. Very lucid, explained with beautiful animations and graphics. Thanks for the video series.
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education
When I install a new EEV into the air con, should we need to set again, the zero point of the step motor for the main processor know how far motor goes?
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When I install a new EEV into the air con, should we need to set again, the zero point of the step motor for the main processor know how far motor goes?
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prakash
Appreciate your content on HVAC! Could you make video on POSV usage and internal and external equaliser used upon TEV on chilled water system
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Appreciate your content on HVAC! Could you make video on POSV usage and internal and external equaliser used upon TEV on chilled water system
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Adex
Hi, can you make a video on how to select refrigeration system components (coils, compressors, pipes) after you calculate the BTUH required?
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Hi, can you make a video on how to select refrigeration system components (coils, compressors, pipes) after you calculate the BTUH required?
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Coon
The liquid vapor gets superheated to a vapour but remains cold at the same time in the evaporator coil how come. Superheat means very hot.
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The liquid vapor gets superheated to a vapour but remains cold at the same time in the evaporator coil how come. Superheat means very hot.
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Sujith
Hi sir
In auto mode exv not open. But manualy exv working. Whats the problem. We change exv controller and display. But same problem
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Hi sir
In auto mode exv not open. But manualy exv working. Whats the problem. We change exv controller and display. But same problem
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Altamash
Sir please make a video about difference between ac & dc motor and how to direct start our ac without PCB please sir thankyou
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Sir please make a video about difference between ac & dc motor and how to direct start our ac without PCB please sir thankyou
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Rawy
8 people who tick dislike, they fell in the exams of refrigeration and A/C
Well done Paul. Thanks for your efforts mate.
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8 people who tick dislike, they fell in the exams of refrigeration and A/C
Well done Paul. Thanks for your efforts mate.
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ROOM
question: are the electronic expansion valve and linear expansion valve the same? if not then whats the difference?
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question: are the electronic expansion valve and linear expansion valve the same? if not then whats the difference?
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basspig
My Mr Cool minisplit has an EXV. Their tech tells me I don't have to be concerned with superheat numbers.
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My Mr Cool minisplit has an EXV. Their tech tells me I don't have to be concerned with superheat numbers.
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