Tool List- www.amazon.com/shop/acservicetech Support- www.patreon.com/acservicetech For those that are looking for the tools used in the videos: (Linked Below) Here is the Link for the newer UEI DL469 Multimeter- amzn.to/2jw4ePJ Here is a link for the Supco Magnet Jumpers amzn.to/2gS4h6z Here is the Link for the newer UEI DL479 Multimeter with temp sensor- amzn.to/2jtsUbJ Here is the link to the 2 pairs of alligator clips- amzn.to/2CtIL5z Here is the Link for the UEI DL389 Multimeter used in the video - amzn.to/2naJr9o Here is the Link for the FieldPiece ST4 Dual Temp Meter- amzn.to/2AhR6ph Here is the link for the Irwin Wire Stripper/Cutter/Crimper- amzn.to/2dGTj2V Here is a link to the Stanley 6 in 1 screwdriver- amzn.to/2x7NuaZ Other tool links can be found in the video description section. Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal- www.amazon.com/shop/acservicetech All of the ACSERVICETECH Playlists- ruclips.net/channel/UCOZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public If you want to support the ACSERVICETECH Channel and receive more HVACR content, check out www.Patreon.com/acservicetech
Block come com pipe thinkes goos conteshionz need vacomw gasfill g aslo out dids pestage corex les mind us full need treaing nee no trianing sime preastged making dis butter gpod reparing somanneny comon mind us full need only makinf iam treanes with wor king standerd jobe som poltacal wenogh made no my bos eng with
Great video, even better break downs and explanation. I'm grateful for the experienced techs who enjoy sharing and teaching. Unfortunately I have worked for a shop that has well rounded seasoned techs that instead of showing the ropes make things unpleasant for apprentices new to the trade. All but two of our guys really enjoy teaching, in a already challenging trade it is much appreciated to learn from the vets when possible
I have worked in refrigeration and AC for many years - but have now been working in other field for many years - I GREATLY ENJOY VIEWING YOUR RUclips videos - when I hear about possible flooding of compressor - I never hear the instructor mention that many engineers will install a SUCTION LINE ACCUMULATOR to reduce the risk of damaging the compressor - should a flood back condition occur. 😐✌️✌️✌️
I love your videos man you make hvac so much fun and I love how you describe every little thing. I'm a hard learner and for me to fully understand how stuff works and to be able to work on stuff I like to know what every little thing is and how it works. I'm currently about to start reading chapter 11 of your book and i just got it about 7 days ago. I love how these videos flow with the chapters in your book too. Thanks man 😃 😊 😀
thanks . very informing video. on the piston type metering device , if the amount of refrigerant entering the evaporator is the same at all time what is the reason of having thermostat to make house cooler , unlike TXV that change the amount of refrigerant for better cooling.
so does the fixed orifice allowed more or less refrigerant into the evap based on pressure difference? sorry i am a little confused when you said that the fixed orifice ONLY allowed the SAME amount of refrigerant through. thank you.
Can you elaborate more on the spring pressure and the bulb pressure? Is there a set pressure on the bulb? I'm reading about it but not fully understanding.
I had a new evap coil installed and they forgot to install the orifice piston and the system was running for 2 months without the orifice installed. Can the compressor be damaged with this missing? Also when they discovered that the piston was missing they opened the line installed the piston and did not vacuum the system down and just added refrigerant.
The refrigerant in the powerhead assembly i.e. in sensing bulb. will determine refrigerant of txv. So you can swap the r22 powerhead with 410a powerhead to make 410a txv.
hi, with a fixed orifice lets just say head pressure is 200# and suction pressure is 100# an amount of refrigerant is fed into the evaporator. Now if the head pressure goes up to 350# and suction pressure stays same. Would there be more refrigerant going into the evaporator because of the bigger pressure difference? thanks.
Can gou help me identify my metering device. I took my evap outer panel off and all i see is input line going into capilaries. Is that all ive got? Thanks for the informative video!!
Thank you for the video. Tell more please about how to diagnose bad txv. How to diagnose bad txv using gauges. Or maybe you know another ways. Before summer it will be very helpful video. Tell please about improperly installation, and symptoms of that. Tell please about mismatch system, when condenser bigger than coils or coils bigger than condenser, how to diagnose it using models numbers of equipments. Tell please how to diagnose mismatch system using gauges(when you adding freon in suction line(low side pressure goes up), but high side pressure not going up). Tell please how to calculate if system is smaller than has to be(ton - sqft). Thank you so much for you job.
Ha ha, this all items I have been working on in the book. It will be out soon. look up acservicetech txv troubleshooting for what I have out there now. Thanks for letting me know what you would like t see, thanks
Shop through Amazon! www.amazon.com/shop/acservicetech All of the ACSERVICETECH Playlists- ruclips.net/channel/UCOZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public Support the Channel! www.Patreon.com/acservicetech
That would be a good idea, thanks for letting me know what you would like to see. Seer is seasonal energy efficiency rating and it has to do with a match of larger or more efficient coils or other refrigerant heat exchangers. Basically a larger outdoor unit with more surface area of coil would be more efficient at rejecting heat to the outdoors, thanks!
I have 44 old heat pumps in one area that are slowly being changed out with fixed piston. Over the years people have done repairs without using nitrogen and the piston gets clogged from carbon and acting like the system is being pumped down so you need to take power off the reversing valve to go in heat mode to unclogg it. Big pain in A$$ but if it had a txv it would open more and let refrigerant threw.
Wow, that is a shame. Many don't realize the internal affects of brazing without nitrogen because they leave and may not hear from the customer again. They assume it doesn't matter. Has a new filter drier been installed right in front of the piston to reduce the potential for clogs?
As i go I pump them down and replace filter driers. The units are now 30 years old so there tuff units and some have been replaced and the boss bought me 33 new units. I just need a contractor to do the jobb as my days are filled with repairs here and there all over the place.
Civilian at shaw AFB in sumter SC I work with airmen and try to train the ones that want to work lol. We have 4 civilian open positions currently but the last 5 that applied are not quallified at all.
Ha, nice. Yet another example of open positions for highly qualified applicants without any highly qualified applicants. Sorry to hear that as I am sure it puts extra work on you. The nice thing I guess is that they will rely and depend on you and want to keep you very happy I hope. Thanks
Really we typically install txv's for efficiency and compressor safety now. You would need to look up that manufacturers install manual for piston sizing matched to the outdoor btu/hr tonnage, thanks
Hi mate The suction pipe that goes to compressor starts freezing low side saturated temperature is minus 1 Celsius and suction line temperature befor compressor is 4.9 to 5.2 celsius r22. And high side is about 155 psi I add 2 kilo charge to unit but the. Temperature still below zero(low side) while unit running in cool mode of temperature set on 18 degree. Ducted split system fujitsu. Dry bulb temperature almost 22 Celsius Unfortunately didn't check the metering device and wet bulb. but as the unit is 15 years old I think it's not txv most probably. According to above mentioned information I diagnosed the problem as a restricted metering device. Which is preventing refrigerant feed to system fluently. High and low side is very low pressure at same time. What's your opinion? Many thanks
Ace Look Reno's. Check ahu filter. Check indoor fan, / capacitor. Set to high fan speed. Up your set point. Recheck gas. If in doubt weigh out/weigh in gas. It's very rare but a blocked liquid line filter can drop your temperature, A restriction in the system will usually send the head pressure way up
When you have a heat pump, you only want one of the two metering devices active so if the cap tube is at the indoor coil and the indoor coil is now acting like the condensor coil in heat mode, the liquid refrigerant would need to flow around it to the metering device at the outdoor coil which is now the evap. Have you seen this video- ruclips.net/video/2Ahzi1U0fYk/видео.html
I just watched it. I understand the need to bypass a metering devices such as piston and txv, depending on whether it is heating or cooling, because they work in one direction and the direction of the refrigerant changes. but for the capillary tube, from my understanding, there shouldn't be a need to bypass because it should work in both directions as it is just a tube and hence no need for bypass. Am I correct? Please correct me if i'm not because i'm working on a reversible heat pump project and am planning on using a cap. tube for this reason.
The cap tube is the metering device, just like a piston and would force your newly formed subcooled liquid from the indoor coil in heat mode to flash into the liquid tube before making it out into the 3/8 liquid line going to the outdoor unit. The cap tubing is the metering device and liquid won't flow through it without the pressure drop, thanks
what i mean to ask is, wouldn't a single capillary tube function properly as the metering device in both cooling and heating modes? no need for bypass and a second metering device.
You would have to monitor the actual superheat by checking the charge while adjusting the spring but in ac units, most don't have springs and the ones that do are usually already set to hold 10 to 14 degrees of superheat unless someone adjusted it, thanks!
@@acservicetechchannel Thanks you for replying back.. I work with refrigeration warehouse..my TXV has heavy frost no matter how much adjusted counterclockwise it still heavy frost and ice. I already replaced power head.. it has frost and ice not on TXV body but on the tube.. it not low on refrigerant
Hey I have a question that's I cant find any information on. I've always been taught that your liquid line receiver helps insure that vapor refrigerant doesn't get to your metering device. Is this true and if so can vapor before your metering device actually damage it?
Hey Licheer, the receiver is a storage vessel for the subcooled liquid that is not needed during low indoor load conditions and as part of the automatic pump down system so that the condensor coil does not fill up with liquid during the pump down. Look up "acservicetech receiver" for a video on that, thanks
I HAVE INSTALLED A BRYANT MODEL 702B 30000 BTU (2 1/2 TON) AIR CONDITIONER, SINCE 2006. IT WORKED WELL UNTIL 2018, A TOTAL OF 12 YEARS. THE COMPRESSOR COPELAND MODEL ZP29K5E-PFV-1300,GOT DAMAGED. I IT REPLACED WITH A COPELAND PISTON COMPRESSOR AND R22 COOLANT GAS. THE ORIGINAL METERING DEVICE WAS REPLACED BY CAPILLARY TUBES. IT WORKED WELL FOR A YEAR AND THIS COMPRESSOR BURNED. I WANT TO RE-INSTALL THE COPELAND ZP29K5E-PFV-130 COMPRESSOR, BUT THE PROBLEM IS NOW, IT IS THAT I DO NOT KNOW NEITHER THE LENGTH OR DIAMETER OF THE ORIGINAL CAPILLARY TUBES. IN THE BRYANT MANUAL IT SHOWS THE METERING DEVICE SIZE, WHICH IS THE NUMBER 0.057 BUT IT DOES NOT INDICATE NEITHER THE. LENGTH OR DIAMETER OF THE CAPILLARY TUBES FOR THIS METERING DEVICE. PLEASE COULD YOU TELL ME THE SIZE OF THE CAPILLAY TUBE (LENGTH-DIAMETER) FOR THE METERING DEVICE SIZE 0.057. I WILL APRECCIATE ALL THE HELP THAT YOU COULD GIVE ME. GREETIN
Tool List- www.amazon.com/shop/acservicetech
Support- www.patreon.com/acservicetech
For those that are looking for the tools used in the videos: (Linked Below)
Here is the Link for the newer UEI DL469 Multimeter- amzn.to/2jw4ePJ
Here is a link for the Supco Magnet Jumpers amzn.to/2gS4h6z
Here is the Link for the newer UEI DL479 Multimeter with temp sensor- amzn.to/2jtsUbJ
Here is the link to the 2 pairs of alligator clips- amzn.to/2CtIL5z
Here is the Link for the UEI DL389 Multimeter used in the video - amzn.to/2naJr9o
Here is the Link for the FieldPiece ST4 Dual Temp Meter- amzn.to/2AhR6ph
Here is the link for the Irwin Wire Stripper/Cutter/Crimper- amzn.to/2dGTj2V
Here is a link to the Stanley 6 in 1 screwdriver- amzn.to/2x7NuaZ
Other tool links can be found in the video description section.
Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal- www.amazon.com/shop/acservicetech
All of the ACSERVICETECH Playlists- ruclips.net/channel/UCOZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public
If you want to support the ACSERVICETECH Channel and receive more HVACR content, check out www.Patreon.com/acservicetech
Ye good morinv evrbedy thankypu shering od mode expanshoin soms ponit only now expanshion electriones exv exv exe
Block come com pipe thinkes goos conteshionz need vacomw gasfill g aslo out dids pestage corex les mind us full need treaing nee no trianing sime preastged making dis butter gpod reparing somanneny comon mind us full need only makinf iam treanes with wor king standerd jobe som poltacal wenogh made no my bos eng with
Great video, even better break downs and explanation. I'm grateful for the experienced techs who enjoy sharing and teaching. Unfortunately I have worked for a shop that has well rounded seasoned techs that instead of showing the ropes make things unpleasant for apprentices new to the trade. All but two of our guys really enjoy teaching, in a already challenging trade it is much appreciated to learn from the vets when possible
I have worked in refrigeration and AC for many years - but have now been working in other field for many years - I GREATLY ENJOY VIEWING YOUR RUclips videos - when I hear about possible flooding of compressor - I never hear the instructor mention that many engineers will install a SUCTION LINE ACCUMULATOR to reduce the risk of damaging the compressor - should a flood back condition occur. 😐✌️✌️✌️
Thank you for this video. I am a new HVAC student and videos like this are very helpful.
Glad to help Glenn and make sure to read the articles I wrote over at www.acservicetech.com thanks!
I love your videos man you make hvac so much fun and I love how you describe every little thing. I'm a hard learner and for me to fully understand how stuff works and to be able to work on stuff I like to know what every little thing is and how it works. I'm currently about to start reading chapter 11 of your book and i just got it about 7 days ago. I love how these videos flow with the chapters in your book too. Thanks man 😃 😊 😀
thanks . very informing video.
on the piston type metering device , if the amount of refrigerant entering the evaporator is the same at all time what is the reason of having thermostat to make house cooler , unlike TXV that change the amount of refrigerant for better cooling.
Great video! What about FCCV or Flow Control Check Valves used in Trane and American Standard systems?
Thank you for the vedio , just I have a question how to know if just the power head is bad on the txv
so does the fixed orifice allowed more or less refrigerant into the evap based on pressure difference? sorry i am a little confused when you said that the fixed orifice ONLY allowed the SAME amount of refrigerant through. thank you.
Thank you, you have helped me alot the last 3 years ☺
I am glad that they have been helping and thank you for your service!
Good information
Can you elaborate more on the spring pressure and the bulb pressure? Is there a set pressure on the bulb? I'm reading about it but not fully understanding.
I will be doing more videos on things like that when the book is out, thanks Mickey!
Great video keep up the good work.
I had a new evap coil installed and they forgot to install the orifice piston and the system was running for 2 months without the orifice installed. Can the compressor be damaged with this missing? Also when they discovered that the piston was missing they opened the line installed the piston and did not vacuum the system down and just added refrigerant.
How does the manufacturer of txvs determine which refrigerant willl work with which txv?
The refrigerant in the powerhead assembly i.e. in sensing bulb. will determine refrigerant of txv. So you can swap the r22 powerhead with
410a powerhead to make 410a txv.
hi, with a fixed orifice lets just say head pressure is 200# and suction pressure is 100# an amount of refrigerant is fed into the evaporator. Now if the head pressure goes up to 350# and suction pressure stays same. Would there be more refrigerant going into the evaporator because of the bigger pressure difference? thanks.
You have no load on the coil
Very Helpful thank you.
Great video
Hi Sir,
What would be the problem with my ac unit? compressor hi-pressure and ice build-up in between capillary tube and tube. Thanks
good practical stuff for DIYers ...
Can gou help me identify my metering device. I took my evap outer panel off and all i see is input line going into capilaries. Is that all ive got? Thanks for the informative video!!
Piston/fixed orifice
Thank you for the video. Tell more please about how to diagnose bad txv. How to diagnose bad txv using gauges. Or maybe you know another ways. Before summer it will be very helpful video. Tell please about improperly installation, and symptoms of that. Tell please about mismatch system, when condenser bigger than coils or coils bigger than condenser, how to diagnose it using models numbers of equipments. Tell please how to diagnose mismatch system using gauges(when you adding freon in suction line(low side pressure goes up), but high side pressure not going up). Tell please how to calculate if system is smaller than has to be(ton - sqft). Thank you so much for you job.
Ha ha, this all items I have been working on in the book. It will be out soon. look up acservicetech txv troubleshooting for what I have out there now. Thanks for letting me know what you would like t see, thanks
Shop through Amazon! www.amazon.com/shop/acservicetech
All of the ACSERVICETECH Playlists- ruclips.net/channel/UCOZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public
Support the Channel! www.Patreon.com/acservicetech
Thanks for your guidance
Thanks Surya!
What exactly is a sear?could you do a short on this.
That would be a good idea, thanks for letting me know what you would like to see. Seer is seasonal energy efficiency rating and it has to do with a match of larger or more efficient coils or other refrigerant heat exchangers. Basically a larger outdoor unit with more surface area of coil would be more efficient at rejecting heat to the outdoors, thanks!
I have 44 old heat pumps in one area that are slowly being changed out with fixed piston. Over the years people have done repairs without using nitrogen and the piston gets clogged from carbon and acting like the system is being pumped down so you need to take power off the reversing valve to go in heat mode to unclogg it. Big pain in A$$ but if it had a txv it would open more and let refrigerant threw.
Wow, that is a shame. Many don't realize the internal affects of brazing without nitrogen because they leave and may not hear from the customer again. They assume it doesn't matter. Has a new filter drier been installed right in front of the piston to reduce the potential for clogs?
As i go I pump them down and replace filter driers. The units are now 30 years old so there tuff units and some have been replaced and the boss bought me 33 new units. I just need a contractor to do the jobb as my days are filled with repairs here and there all over the place.
Got ya sounds like a nice big job! What kind of facility are you working at?
Civilian at shaw AFB in sumter SC I work with airmen and try to train the ones that want to work lol. We have 4 civilian open positions currently but the last 5 that applied are not quallified at all.
Ha, nice. Yet another example of open positions for highly qualified applicants without any highly qualified applicants. Sorry to hear that as I am sure it puts extra work on you. The nice thing I guess is that they will rely and depend on you and want to keep you very happy I hope. Thanks
Great video like always.😜
Thanks Phillip!
I have a Payne heat pump I’m going to install. It comes with a piston that goes on the liquid line how do I know what size I need for evap coil??
Really we typically install txv's for efficiency and compressor safety now. You would need to look up that manufacturers install manual for piston sizing matched to the outdoor btu/hr tonnage, thanks
Can you make a video replacing a piston to txv on a evap coil
My question about pistons for r22 and 410a the piston for 410a larger or smaller
R410a are slightly smaller than a same size btu/hr size in R-22 since it is higher pressure, thanks Wayne!
@@acservicetechchannel thank you for affirm my thoughts. Thanks you are great teacher. I really enjoyed your videos keep up the great work.
Thanks Wayne!
Great video thank you
Thanks Ron!
Can you do a video on how to convert a ecm blower motor to an psc motor.
I would like to eventually, thanks!
Orifice removig and bipassig eni problem plees telme
Hi mate
The suction pipe that goes to compressor starts freezing low side saturated temperature is minus 1 Celsius and suction line temperature befor compressor is 4.9 to 5.2 celsius r22.
And high side is about 155 psi
I add 2 kilo charge to unit but the. Temperature still below zero(low side) while unit running in cool mode of temperature set on 18 degree.
Ducted split system fujitsu.
Dry bulb temperature almost 22 Celsius
Unfortunately didn't check the metering device and wet bulb. but as the unit is 15 years old I think it's not txv most probably.
According to above mentioned information I diagnosed the problem as a restricted metering device. Which is preventing refrigerant feed to system fluently. High and low side is very low pressure at same time.
What's your opinion?
Many thanks
Ace Look Reno's. Check ahu filter. Check indoor fan, / capacitor. Set to high fan speed. Up your set point.
Recheck gas. If in doubt weigh out/weigh in gas.
It's very rare but a blocked liquid line filter can drop your temperature,
A restriction in the system will usually send the head pressure way up
why would the heat pump need to bypass the cap tube? it's just a plain tube, i would assume the direction of flow doesn't matter
When you have a heat pump, you only want one of the two metering devices active so if the cap tube is at the indoor coil and the indoor coil is now acting like the condensor coil in heat mode, the liquid refrigerant would need to flow around it to the metering device at the outdoor coil which is now the evap. Have you seen this video- ruclips.net/video/2Ahzi1U0fYk/видео.html
I just watched it. I understand the need to bypass a metering devices such as piston and txv, depending on whether it is heating or cooling, because they work in one direction and the direction of the refrigerant changes. but for the capillary tube, from my understanding, there shouldn't be a need to bypass because it should work in both directions as it is just a tube and hence no need for bypass.
Am I correct? Please correct me if i'm not because i'm working on a reversible heat pump project and am planning on using a cap. tube for this reason.
The cap tube is the metering device, just like a piston and would force your newly formed subcooled liquid from the indoor coil in heat mode to flash into the liquid tube before making it out into the 3/8 liquid line going to the outdoor unit. The cap tubing is the metering device and liquid won't flow through it without the pressure drop, thanks
what i mean to ask is, wouldn't a single capillary tube function properly as the metering device in both cooling and heating modes? no need for bypass and a second metering device.
@@hjalsadah - NO.
Good stuff.
Thanks Oscarbm!
"clogillary" or "plugillary" tube would both be rather fitting newly made words :)
Nice!
How do you determine TXV Spring psi..?
You would have to monitor the actual superheat by checking the charge while adjusting the spring but in ac units, most don't have springs and the ones that do are usually already set to hold 10 to 14 degrees of superheat unless someone adjusted it, thanks!
@@acservicetechchannel Thanks you for replying back.. I work with refrigeration warehouse..my TXV has heavy frost no matter how much adjusted counterclockwise it still heavy frost and ice. I already replaced power head.. it has frost and ice not on TXV body but on the tube.. it not low on refrigerant
What! No mention of low or high side float systems. Just residential I guess?
Mainly residential, light commercial, thanks
EFD620G. What float system.
How can a layperson know what type metering device they have
Gread video
Hey I have a question that's I cant find any information on. I've always been taught that your liquid line receiver helps insure that vapor refrigerant doesn't get to your metering device. Is this true and if so can vapor before your metering device actually damage it?
Hey Licheer, the receiver is a storage vessel for the subcooled liquid that is not needed during low indoor load conditions and as part of the automatic pump down system so that the condensor coil does not fill up with liquid during the pump down. Look up "acservicetech receiver" for a video on that, thanks
👍🏾👍🏾👍🏾👍🏾
Thanks Tank!
Have you ever replaced a capillary tube that was clogged or cleaned it?🤔🤔🤔😉
👍✌
Thanks Camilo!
I HAVE INSTALLED A BRYANT MODEL 702B 30000 BTU (2 1/2 TON) AIR CONDITIONER, SINCE 2006. IT WORKED WELL UNTIL 2018, A TOTAL OF 12 YEARS. THE COMPRESSOR COPELAND MODEL ZP29K5E-PFV-1300,GOT DAMAGED. I IT REPLACED WITH A COPELAND PISTON COMPRESSOR AND R22 COOLANT GAS. THE ORIGINAL METERING DEVICE WAS REPLACED BY CAPILLARY TUBES. IT WORKED WELL FOR A YEAR AND THIS COMPRESSOR BURNED. I WANT TO RE-INSTALL THE COPELAND ZP29K5E-PFV-130 COMPRESSOR, BUT THE PROBLEM IS NOW, IT IS THAT I DO NOT KNOW NEITHER THE LENGTH OR DIAMETER OF THE ORIGINAL CAPILLARY TUBES. IN THE BRYANT MANUAL IT SHOWS THE METERING DEVICE SIZE, WHICH IS THE NUMBER 0.057 BUT IT DOES NOT INDICATE NEITHER THE. LENGTH OR DIAMETER OF THE CAPILLARY TUBES FOR THIS METERING DEVICE.
PLEASE COULD YOU TELL ME THE SIZE OF THE CAPILLAY TUBE (LENGTH-DIAMETER) FOR THE METERING DEVICE SIZE 0.057.
I WILL APRECCIATE ALL THE HELP THAT YOU COULD GIVE ME.
GREETIN