How I Diagnose a Bad TXV | 👉 Thermostatic Expansion Valve 🦊
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- Опубликовано: 27 июл 2024
- In this HVAC training video, I will describe how I diagnose a bad TXV. A thermostatic expansion valve meters the flow of refrigerant into the evaporator coil.
#thermostaticexpansionvalve #hvactrainingvideos
HERE IS THE LINK FOR THE FLOW CHART 👇⬇
1drv.ms/u/s!AnT17rJhe6DVg9Jjd...
If the thermal expansion valve is bad the evaporator coil freezing might happen, which would reduce airflow to the point where no more air would blow into the house. It can be frustrating not knowing what's going on with your TEV or thermal expansion valve as some people call it. If you don't know the symptoms of a bad TXV, you might end up just making things worse for the homeowner. If you need TXV troubleshooting tips, don't be shy. I can get you through this! Figuring out your subcool and superheat will help you diagnose a bad TXV. The metering device on an evaporator coil could be a fixed orifice or a TXV. So, good luck with this video and the TXV explained.
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00:00 Intro
1:16 What's happening inside the evaporator coil?
3:13 Before diagnosing a bad TXV, Check the basics
4:52 Superheat
5:42 Subcool
6:10 Communicating refrigerant pressures to each other
6:36 What can we tell when we check superheat and subcool?
7:08 It’s a Bad TXV. What Can I Do Now? 
Кино
This video is as good as it gets, very informational and to the point, thank you from Florida Greg.
Awesome! Thanks!
@@foxfamilyheatingandaircond4696 great video sir! Just a quick question, if there's no liquid line service valve how do I measure superheat?
The way I was trained was to verify Airflow (filters, coils, fans, obstructions) then Electronics (motors, capacitors, controls) before ever putting gauges on. In 10yrs residential and light commercial I've found far more bad customers than bad TXVs. This is a great video, thank you.
whats a "bad customer"
Actually with the 2007 regulations. Systems did not get more efficient with txv's. Its was because the suface area on the evap and condensor coils got bigger to absorb and reject more heat and humidity. Goodman proved this while staying with a piston metering device.
Yes 100
I loled at the guy hammering the tire when you said tap on it with a tool
I had a TXV diagnosed some years ago and they asked me for a glass of ice water. At the time I didn't know it was for the diag process but learned a minute later. He correctly called for the TXV. And yes, the system did perform somewhat better while the part was on order. Thing is, I kept the system operating right on the knee between function and failure by resting it periodically when it began to faulter so when he got here it was a no brainer compared to what it might have been. In other words, I did not let the compressor go thermal but the temps/pressures were still off so he could see in a snap what was up.
Thanks for another nice tight discussion.
Great explanation!
As a first year tech, I can't tell you how helpful this is to grasp the concepts of refrigeration.
The illustrations we're especially helpful.
Perfect!
Could you please share the illustrations? I'm having a hard time opening the link. I'm guessing it's no longer good
I use the field piece smans. When talking to other techs about my pressures I always give them both pressures and temps
That's great, and then if they ask you what refrigerant you're dealing with you just learned something about the tech you're talking to.😂🤣😋😎
I like that temperature method,Thanks for sharing
All your videos are thoroughly presented. A real teaching moment. Thank you.
Thanks great explanation of TXV operations ..30 yrs in & I take notes ..Tks again newbies will really Love the tutelage
Every day I learn something new.
Thank you for sharing this video.
Excellent video and explanation. Thanks
Awesome. Thanks!
Great info thanks
Great video
Keep up the good work
Thank you so much!
Thanks
Good video
Excellent video, my installer wants to replace my TXV for the second time ( replaced with a piston while txv was ordered) on a 2 year newly installed SEER 16 Goodman Heat Pump. My temp is set on 77 degree but runs for 25 min on and 5 min off to do the job, this doesn't sound right. I need a good A/C tech in SW Florida.
Are you near Pensacola Florida?
Great video. Where can I get the flow chart? The link is broken!
With a heat exchange unit also can you cycle from heat to cool to see if the valve frees up? Would this damage anything doing this when the ambient temperature is in the high 90,'s to low 100..?
My man
I had one intermittently making the compressor pull into a vacuum
Yep. Sounds right
Does anyone know where to find this flow chart on the video? I click on the link but it is expired
what is the step where it is correct subcool but high superheat? I dont see it on a the chart.
Very good information. Thank you
Great video Greg, but to get flow chart for txv?
The link is in the description down below
Anywhere of getting that chart
most of those checks should have been done before putting on the gauges, but very nice flow chart!
Definitely right bro
When looking for txv everyone says to look at evap core but on york they are in the heat pump. Should I use super heat or subcool? Thanks!
There should be one TXV at the condenser and another TXV at the evaporator on a Heat pump.
Hello, why does every CARRIER i put in (litterally 10 outta 10). always have 18-20 superheat and low liquid line pressure. Even with 13 subcool. Each install i spend like 3 days checking back and stuff. And I follow manufacturer installation religiously.
Have you figured out why? Do you need to adjust the txv?
@xincai951 no. They dont come with adjustable txv. I have to over size the coil at least half ton or slow down the fan 😅
From where we order TXV valve?
Look for your local hvac supply store
oat, iat, sst, lst, sh, sc.
RUclips makes the jokes with that flow chart.
Tesp & use the dumb chart in the manufacturer install manual to (don't worry the installers chucked it in the trash for you) guesstimate your airflow.
Txv
Hreat
Must be the txv
The link to the flow chart is dead.☹
Great video
Good video