Just a quick heads up on using a marker to mark txv position, if there is moisture on the valve, ink might rub off during adjustments, I try to scribe on it instead, (learned this the hard way) also leave the brass cap in the visible area so you don’t forget to put it back on:).Another Good Video! Thank You!
Changing from 404a to 449a today, i felt that i had to fill a larger charge than the system would need but it is a 404a txv, and i assumed it was working right prior to this repair, anyway tomorrow im going to do a follow up check with the room at temperature…the question is that i filled to full sight glass and do have a presumably intact receiver. My understanding is that if i adjust the txv for ideal superheat the system may become slightly overcharged from the throttling back of refrigerant flow through the txv…i know its never fully seated but it does change fluid flow rates….or is that likely negligible and im overthinking things. Running pressures were what would be good at 227 psi and 68 psi with the room being 5 degrees celcius almost at temp. Cheers
Excellent video. Question: Why do some manufacturers (eg. Goodman) recommend adjusting SH in Stage 1 (not 2) to 6 degrees on the compressor side? After watching your video, this seems wrong (or are they using their own parameters?).
Hi. Great video and explanation but can you make a video or quick explanation how the txv works in heating mode. Does it allows revers flow and if it does not how the refregirent flows in the other way? Thank you!
Think of the handle on your water faucet at home. Turning on the water (counter clockwise), allows more water (refrigerant) to flow. More refrigerant flow equals more evaporator cooling and less superheat (cooler). Too little superheat? Turn the "handle" clockwise just like at the faucet, making less refrigerant flow, warming up the coil, and increasing the superheat (warmer). Half a turn at a time and wait 15 to 20 minutes between turns to stabilize.
Thanks for the video. Hope you're still reading the comments. So a question, when you use a larger inside coil (say 3 ton compressor single speed and 4 ton inside coil) do you move the txv bulb down on the coil to lower position where it should be flooded properly? Seems like the compressor would not be able to provide enough liquid for the larger coil, at least for the txv to work properly and not hunt. I see the use of larger coils is common now. Of course, the remaining, say 1/4 of the evaporator above that point would still continue to make heat transfer and of course that would affect the superheat right? How are they making it all work. Any thoughts? Cheers.
What about TXV valves that have a circlip on the spindle so the actual spindle is not screwing in or out, it would apparently be threaded onto something inside in which case screwing it in May lift the spring retainer up and reduce tension on it. I can't see the brand because it's burned off from somebody who replaced it before, but it's not opening enough want to make sure I'm going the right direction. But definitely the stem does not move in or out as you turn it, so it's obviously only moving something inside of the body, but you cannot tell which direction
What’s it mean when the sh and subcool keep fluctuating in sync. So in a span of 10 sec the sc will be 15 then goes down to 3 then after about 2 seconds of being on 2 it goes back up repeatedly up down up down. Is that a charge problem or is something going on with the compressor itself
Why does the Goodman txv charging instructions on the inside of service panel tell you to adjust the txv to find 7°-9° superheat then charge to your subcool?
I have the same concern. Just installed a Goodman 3-ton 18 SEER, two-stage, ECMs-all-around, split system heat pump. Instructions (in both the service panel and condenser manual) clearly say to adjust SC and SH in different orders (whereas the video insists on always adjusting SC first). Worse, Goodman also says to adjust SC and SH in Stage 1 (which means low inside air flow, etc). I have not yet found an HVAC guy who could give me some reasonable explanation (and Goodman won't talk to me).
@@drair-kp3cx yeah sounds backward. Only reason I can think to charge to sc and sh in 1st stage is so the unit is not overcharged when in 1stage but then it will be undercharged in 2nd stage. I would think. Sometimes I have to charge to a lower sc in order to match the sh to manufacturers specifications on some units. Pistons are less complicated to charge as long as you get your target sh correct.
@@drair-kp3cx I have installed a few of those Goodman systems and get the subcooling set in 2md stage and everything else works out nicely. I have never adjusted a TXV valve ever. And I doubt I will unless I truly believe someone else messed with it. I worked with an old-timer that would have thrown me off the roof if I messed with a TXV valve. I live on an island and we get a lot of humidity and if we do not lower fan speed the unit upon startup can pull tremendous amperage, and have all kinds of subcooling and superheat issues as well as throw water onto the EMC blower motor. It will not dehumidify or cool properly so we lower fan speed and raise the temperature differential between supply and return and we get excellent dehumidification and cooling. And we maintain a low compression ratio. If you mess with the TXV valve you can starve the evaporator after the house cools down and dries out. This also tends to raise the compression ratio so it is taboo where I live. I do not install in areas where there is no condensate created so I cannot say for sure but I suspect even there you should not mess with the TXV valve. There you would raise the fan speed.
Very good information bro I am from Guyana I do fridges freezer and small split ac I do not have much experience with this value but with this information I am leaving thanks for that one small question how can I know the in and the out of the TXV I work on cooler have it never replace or have problems with thanks
Hello Bryan my teacher says that TXV valve can go 10% + or - . So if a valve is 20 Ton by adjusting the superheat it can be used on a 22 ton or 18 ton is that correct
I did one today lennox .and it was adjustable it said on the box that it was for 1.5ton to 2.5,ton now my unit was 2.5ton the screw out of factory was all closed so im assuming it was for the lowest ton my suction line was just being stuck in 48psi..i cranked it all loose and it went to 101psi which is good down here in florida for heatpump on r410a
Adjustable txv is equivalent to an adjustable fuel pressure regulator in the car world Too much psi means high fuel pressure meaning too much gas being dumped cleaning out your gas tank too fast or blowing fuel line seals/gaskets Too less of fuel pressure can damage your engine due to fuel starvation and spark only being present in the chamber causing damage melting piston
Yeah but lennox factory workers will have you dumping 4-5lb of r410a thinking . 1.the factory workers only added 1lb of r410a to the heat pump 2.youd think when you ask for a warranty indoor txv they send you the same one but they send you a shut screw adj txv .. But we all good now the 3lbs was needed anyways to raise the subcool to spec
How many cranks to get to the center of a TXV-pop Brian? Ohoone, t-whoooo, thr-heee, *owl crunches the powerhead*
Edit: Had to, also great video.
how i need to buy
Just a quick heads up on using a marker to mark txv position, if there is moisture on the valve, ink might rub off during adjustments, I try to scribe on it instead, (learned this the hard way) also leave the brass cap in the visible area so you don’t forget to put it back on:).Another Good Video! Thank You!
Thank you for updating this!! The video in your previous one was giving me a headache!!
Thank you very much for this video. This is very educational, very detailed useful information.
Changing from 404a to 449a today, i felt that i had to fill a larger charge than the system would need but it is a 404a txv, and i assumed it was working right prior to this repair, anyway tomorrow im going to do a follow up check with the room at temperature…the question is that i filled to full sight glass and do have a presumably intact receiver. My understanding is that if i adjust the txv for ideal superheat the system may become slightly overcharged from the throttling back of refrigerant flow through the txv…i know its never fully seated but it does change fluid flow rates….or is that likely negligible and im overthinking things. Running pressures were what would be good at 227 psi and 68 psi with the room being 5 degrees celcius almost at temp.
Cheers
Great video, nice graphics and pace. Thank you!
You're welcome!
Excellent video. Question: Why do some manufacturers (eg. Goodman) recommend adjusting SH in Stage 1 (not 2) to 6 degrees on the compressor side? After watching your video, this seems wrong (or are they using their own parameters?).
Hi. Great video and explanation but can you make a video or quick explanation how the txv works in heating mode. Does it allows revers flow and if it does not how the refregirent flows in the other way? Thank you!
Think of the handle on your water faucet at home. Turning on the water (counter clockwise), allows more water (refrigerant) to flow. More refrigerant flow equals more evaporator cooling and less superheat (cooler). Too little superheat? Turn the "handle" clockwise just like at the faucet, making less refrigerant flow, warming up the coil, and increasing the superheat (warmer).
Half a turn at a time and wait 15 to 20 minutes between turns to stabilize.
Thanks for the video. Hope you're still reading the comments. So a question, when you use a larger inside coil (say 3 ton compressor single speed and 4 ton inside coil) do you move the txv bulb down on the coil to lower position where it should be flooded properly? Seems like the compressor would not be able to provide enough liquid for the larger coil, at least for the txv to work properly and not hunt. I see the use of larger coils is common now. Of course, the remaining, say 1/4 of the evaporator above that point would still continue to make heat transfer and of course that would affect the superheat right? How are they making it all work. Any thoughts? Cheers.
Awesome video it helps a lot …. Thanks a lot
Thanks a lot sir....for good information about TXV...
Thank you for very very nice explanation HVAC school
What about TXV valves that have a circlip on the spindle so the actual spindle is not screwing in or out, it would apparently be threaded onto something inside in which case screwing it in May lift the spring retainer up and reduce tension on it. I can't see the brand because it's burned off from somebody who replaced it before, but it's not opening enough want to make sure I'm going the right direction. But definitely the stem does not move in or out as you turn it, so it's obviously only moving something inside of the body, but you cannot tell which direction
I'm trying to do diy air conditioning, so do I connect low pressure line to equalizer. How do I add refrigerant if low side is attached to equalizer?
Thank you bro ,really very good explanation 🌹👍
Welcome 👍
hi, could you please make a video on loading and unloading mechanism and its troubleshooting? And how external equalizer work fitted in TEV
What’s it mean when the sh and subcool keep fluctuating in sync. So in a span of 10 sec the sc will be 15 then goes down to 3 then after about 2 seconds of being on 2 it goes back up repeatedly up down up down. Is that a charge problem or is something going on with the compressor itself
Grat video sr. Great tools to thank
Thanks for your explanation
Why does the Goodman txv charging instructions on the inside of service panel tell you to adjust the txv to find 7°-9° superheat then charge to your subcool?
I have the same concern. Just installed a Goodman 3-ton 18 SEER, two-stage, ECMs-all-around, split system heat pump. Instructions (in both the service panel and condenser manual) clearly say to adjust SC and SH in different orders (whereas the video insists on always adjusting SC first). Worse, Goodman also says to adjust SC and SH in Stage 1 (which means low inside air flow, etc). I have not yet found an HVAC guy who could give me some reasonable explanation (and Goodman won't talk to me).
@@drair-kp3cx yeah sounds backward. Only reason I can think to charge to sc and sh in 1st stage is so the unit is not overcharged when in 1stage but then it will be undercharged in 2nd stage. I would think. Sometimes I have to charge to a lower sc in order to match the sh to manufacturers specifications on some units. Pistons are less complicated to charge as long as you get your target sh correct.
To ensure there is at least enough liquid at the txv high side to promote proper txv operation then dial in the subcooling.
@@drair-kp3cx I have installed a few of those Goodman systems and get the subcooling set in 2md stage and everything else works out nicely. I have never adjusted a TXV valve ever. And I doubt I will unless I truly believe someone else messed with it. I worked with an old-timer that would have thrown me off the roof if I messed with a TXV valve. I live on an island and we get a lot of humidity and if we do not lower fan speed the unit upon startup can pull tremendous amperage, and have all kinds of subcooling and superheat issues as well as throw water onto the EMC blower motor. It will not dehumidify or cool properly so we lower fan speed and raise the temperature differential between supply and return and we get excellent dehumidification and cooling. And we maintain a low compression ratio. If you mess with the TXV valve you can starve the evaporator after the house cools down and dries out. This also tends to raise the compression ratio so it is taboo where I live. I do not install in areas where there is no condensate created so I cannot say for sure but I suspect even there you should not mess with the TXV valve. There you would raise the fan speed.
hello
hope you ding fine sir
its a very good video did these adjustments effect on discharge tep ???
temp *
Great video! If the spindle cap was left off, would that affect operation in any way?
Where should clamp the sensing bulb exactly in suction line in which position?
can you talk sometime about water source heat pumps
Sir.good day.what is the correct adjustment txv low superheat or high superheat.thanks and god bless
Do I have to use the equalizer? Or just ignore that line?
Hello master.. I just ask about the external equalizer.where is should be the standard location after sensing bulb or before sensing bulb?
Before
what causes an evaporator coil not to be equally cool..? just the bottom half is cold the top half is warm
Very good information bro I am from Guyana I do fridges freezer and small split ac I do not have much experience with this value but with this information I am leaving thanks for that one small question how can I know the in and the out of the TXV I work on cooler have it never replace or have problems with thanks
Hello Bryan my teacher says that TXV valve can go 10% + or - . So if a valve is 20 Ton by adjusting the superheat it can be used on a 22 ton or 18 ton is that correct
I did one today lennox .and it was adjustable it said on the box that it was for 1.5ton to 2.5,ton now my unit was 2.5ton the screw out of factory was all closed so im assuming it was for the lowest ton my suction line was just being stuck in 48psi..i cranked it all loose and it went to 101psi which is good down here in florida for heatpump on r410a
What effect will adjusting the TXV valve have on the high pressure side compressor if any?
Increase or decrease refrigerant density resulting in higher or lower head pressure.
Soooo then refrig.. tube freezing after TXV so where is the problem?
Good job 👍 more
DFWI if you know you know 🤙🏻
Adjustable txv is equivalent to an adjustable fuel pressure regulator in the car world
Too much psi means high fuel pressure meaning too much gas being dumped cleaning out your gas tank too fast or blowing fuel line seals/gaskets
Too less of fuel pressure can damage your engine due to fuel starvation and spark only being present in the chamber causing damage melting piston
👌🏾
Very nice
Thanks so much
You're welcome!
Yeah but lennox factory workers will have you dumping 4-5lb of r410a thinking .
1.the factory workers only added 1lb of r410a to the heat pump
2.youd think when you ask for a warranty indoor txv they send you the same one but they send you a shut screw adj txv ..
But we all good now the 3lbs was needed anyways to raise the subcool to spec
❤
👌
Nice
You used the wrong symbol for less than, again.
Taylor Cynthia Johnson Carol Miller Anthony
Do not try this on oem txv 😂 you'll get a surprise