Troubleshooting a Thermal Expansion Valve (TXV)
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- Опубликовано: 28 сен 2024
- Welcome to Enertech University, online training by Enertech. Testing a thermal expansion valve (TXV) can be done in just a few simple steps. This video shows how to determine whether the TXV is modulating correcting and will help Technicians understand the basics of troubleshooting.
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I have to correct you on an adjustable TXV being adjusted in the field. I have adjusted many, especially on low temp units. If they were not meant to be adjusted in the field the manufacturer would save money and make them without an adjustment stem.
Telling somebody to replace the TXV because it's not metering properly it's like telling somebody to replace their car cuz it's not running correctly.
I would also guess to say that if it had a removable powerhead with a loss of charge you would recommend changing out the whole TXV instead of just the powerhead!
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Before condemning a TXV, you have to check for a restriction upstream, like a plugged filter dryer. The valve needs solid liquid feeding the valve, and at least 100 lbs pressure differential across the valve. The method you used to test the valves operation my removing the bulb, and using hot and cold water is a good idea, and could save replacing a lot of expansion valves. I see a lot of techs not even look at the bulb, to see if it’s mounted correctly and tight. I always replaced the power heads on valves, by pumping the system down. You can tell if the bulb is bad just by pushing on the bellows once it is out. You’re right about the hunting. Usually caused by oversize valve, or improper mounting of the bulb.
We normally put the bulb in the 10 or 2 o’clock position on the pipe.
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Thanks your teaching ... very useful
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Can I disconnect power to water pump and see if Txv will maintain low side pressure? Thank you
No, as that will not tell us if the TXV is good or bad. Superheat & Subcooling readings or a "fire & ice" TXV bulb test will tell you if the TXV will not meter properly.
@@EnertechUniversity it will tell us if it bad or good. If txv is good if will maintain superheat. Because it his job. If txv is bad you will see it on low side of the gauge. Just don’t let your high side go above 400.
now this is my speed!
It turns out, the scroll compressor is shot. Over 6 years of poor operation,three major refrigerant leaks, caused by the installing tech using rosin core solder, soldering flux paste, and poor soldering practices, and 31 joints in the lineset caused almost all of the compressor oil to be leaked out. The TXV's were replaced (both) and the reversing valve WAS defective and replaced.
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Disagree with 2 points,,,, 1 if your hooked up to a system like a supermarket, u will have constant head pressure due to total loop feeding all circuits... In that case if available with a close ball valve, shut down and check the inlet screen, if clean always have a spare power head to spec. replace the power head and check the one removed for power head charge.. a trick an older mech did was pour VERY VERY hot water on the valve and power head hopefully opening up the valve to blow through any restriction...Then point 2 I would change the body or whole valve... sporlan lets say dosn't set the exact super heat for the valve so that has to be done... and the bonus... get that piece of equipment working like a "charm" the customer is very happy and you will get MANY calls to fix others and also he will recommend you to work on other folks stuff.... shaZZZZZAM lol
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Good i wrote up for bad txv put it hot water should open up but didnt move
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Is it good txv?
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thank you sir
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Thanks sir
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Thanks your teching..
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Very useful. Yesterday a check the new unit hight side 600 psi and low side down 0. I think the TXV not open....what you think?
Armando Caballero if u install a new xtv make sure remove the seal in side, could be the problem that is making restriction in u system.. If u still have problem feel free to call a professional..
Armando Caballero I think your on the right track
Luis Garcia you just tried to scare armando into calling a professional, that's not fair armando can fix it,,
I think you starved the compressor
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Martin Gary Thompson Kenneth Johnson David
Thank you for the knowledge, success for "Enertech ....." ... Pekalongan, Central Java, Indonesia attended
Very professional and to the point thank.you sir
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hello , what do you call that insulation tape you wrapped the TXV valve with and can we get it at local home depot or lowes? thanks
Gus F it's a foam tape yeah Home Depot has it
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Corbin Heights
Thank you!!
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Anyone, please clarify my doubt. If it's a single-speed compressor, how a closed TXV will lead to lower current draw?
My understanding is 'the more the pressure is the more the compressor has to work to pump'.
Also how the placement of the bulb affects the TXV? How much does it affect?
I appreciate your responses, Thanks.
I think he mentioned less refrigerant flow...less amp draw..
Thus is what I got...anyway!
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I'm sure you've handled this by now, but the TXV is bypassed during heating. It's only used for cooling. Hope you got it sorted :)
.. bypasses the cooling txv?
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How can you check the TXV if the unit won’t stay on, goes off on high limit very quickly in cooling mode.
Thanks for the comment! We would need a model and serial # before troubleshooting. Feel free to call (618) 664 - 9010 with this information and any further questions.
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I'd love to do this test on my car, but to get to the TXV, you have to remove the evaporator first.
You won’t have a TXV in your car. Your car a/c will have an orifice tube with no superheat control as it’s a critically charged circuit.
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I was trained to adjust before replacing the TXV in the field.
Adjust it? Like, it could just be sticking?
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Saluting you sir
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Thank uuu excellent
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Good knowledge...
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Just checked the TXV at the condenser on my GSHP. In heat mode, my compressor suction pressure is high, and discharge pressure is low . Delta T at the evaporator is only 8 degrees, very low heat output (20-35F is normal temp rise)
I followed the testes outlined here. My TXV being heated (by hand) or frozen in ice water produced NO CHANGE in suction or discharge pressures, Temps remained the same.
I'm thinking my TXV is stuck wide open. It is a Sporlan type with a built in check valve.
Old story by now but, did you hookup your gauges correctly? The lines are flip flopped on a heat pump in heat. Your gauges have to reflect as well.
@@ericlarson8489 It ended up being a scroll compressor that was beat up from most of the oil charge leaking from a poorly soldered (not brazed!!!) line set. The oil was found mostly in a suspended ceiling panel in the basement. It was saturated. I rebuilt the entire system myself. New lineset every connection BRAZED, new TXV's, reversing valve, and new compressor. It has worked perfectly since February 2016. I should have paid close attention to what the incompetent installers were doing. The company that did the install folded a couple years after installation. My entire lineset was SOLDERED, BADLY. I has 6 different leaks, 2 major.
I guess the take away is make certain the installer does it right, which is hard to do if you don't know what "right" is. In the long run, it was less expensive for me to repair the system ($1300 total), than paying some else (I was quoted $2500, parts and labor). At least I know I did a perfect job.
@@ow-my-achilles1106 Interesting. Assuming then the gauges were hooked up properly, I was going to say it seems like it had pumped itself down with high suction and low discharge.
2016, I presume it was 410A refrigerant? Do you do HVAC service work? I'm just curious where you got all the materials, although you could get pretty much everything short of refrigerant online without EPA card. But it sounds like you did a good job though. I'm glad you fixed it better.
Yea there's a lot of scumbag companies out there for sure, that don't really understand HVAC as much as they think. Lot of guys get tired of "working for the man" and think they can take on the responsibility of their own company, only to get slammed with work, in turn hiring less than qualified techs without training them to a standard, and end up delivering sub par final product.
@@ericlarson8489 I actually got my EPA R410 certificate online, taking a test (yes it's true and that test is a joke). I bought my small tank of R410a through Amazon (yup, no issues) still have a partial tank in the garage. I learned to safely do the work my self through 6 weeks of study. I had the advantage of already having a career of tool and die, manufacturing, electronic, system controls, metal forming fabrication and design. The HVAC didn't scare me, except the respect for the safety issues regarding high pressure refrigerant! I never worked on a charged system and I recovered every ounce of refrigerant and took it to a place that took back and reclaims used refrigerant. I bought all my tools online (vacuum pump, recovery pump and tank, oxy/acet torch, silver braze everything!!!). Practiced the brazing for hours, although I admit I was already a pro at copper soldering electrical and plumbing copper. Not a big difference except for the heat and timing. Prep is everything!!
You description of the woes of a guy going it alone sounds like my installer! He had newbie just out of school kids doing all the interior installation work. They had no experience and NO supervision. I was at work during the majority of the install. My father and I completely gutted an did their electrical routing over, it was abysmal. I should have kicked them out then, a day into the install. sigh....
@@ow-my-achilles1106 EnduroSportCT Wow. Impressive. Expensive. Really expensive. Pump, recovery machine, tanks. Shit might as well start your own company at that point! That's like half the equipment if not all. And the most expensive. Haha.
But yea it's unfortunate. See it all the time here in Arizona. Can't just go after the money. Can't give your guys "leg work" jobs because "back in my day it's how I learned" mindset. You're ruining your potential that way and instilling bad habits. Eventually if they're smart, the newbies will get tired of working for that scumbag and do their own thing, or if they're smarter, go to bigger company and get better training of how the system should work and procedure how to do things. If the first, well, that just introduces failure to the system. Think they can do it better with no experience. It's unfortunate, but just how it is. It's a demanding, dog eat dog world. If you're honest and do a good job, you'll have endless work and can pace yourself. That's always the end goal. Customer satisfaction over money. If they're satisfied, they'll get you work. Just my opinion.