No Cooling - Very Low Suction !

Подписаться 63 тыс.

Просмотров 34 тыс.

50% 1

In this call I found multiple problems. But, I was called out for no cooling. I had a very low suction, 5.3 degrees subcooling and 70 degrees superheat. I tried to show why I think the problem is the TXV. #hvac #hvactech #hvactechnician #hvacguy #hvaclife #txv #ruud #nocooling
Merch Store: hvac-guy-2.creator-spring.com
Here are links to the tools I use, And it costs you nothing extra to buy from this list:
Wheel Puller: amzn.to/3Co3wfm
Magnob for Acetylene tank: amzn.to/3hEt3Yc
Fielpiece SC680 Clamp Meter: amzn.to/33rhxvE
Fieldpiece SC480 Clamp Meter: amzn.to/33kfgCB
Fieldpiece SMAN 480 Digital Manifold: amzn.to/3twfVvA
Fildpiece SVG3 Vacuum Gauge: amzn.to/3udursu
Fieldpiece DR58 Leak Detector: amzn.to/3nt1TXw
Fieldpiece Blutooth Scale: amzn.to/3Gzveab
Fieldpiece SDMN6 Manometer: amzn.to/3qwk9RP
Fieldpiece 8CFM VP87 Vacuum Pump: amzn.to/3qC2wA2
Makita XDT16: amzn.to/3riXuaJ
Makita 18V Light: amzn.to/3Fw4GW4
Makita Wet/Dry Vacuum : amzn.to/3tw4dAL
Makita 18V Battery Mounts in Van : amzn.to/3GxpVID
Makita 18V Angle Grinder: amzn.to/3gskNd7
Grinder Quick Replace Locknut: amzn.to/32YZugb
Makita Jobsite Radio: amzn.to/3HuVp2u
DIY Vacuum Attachment for drains: amzn.to/3tDpfNU
Fieldpiece Smart Probe Kit : amzn.to/34NG3HL
Klein Heavy Duty Wire Strippers : amzn.to/3I8YNzT
Klein Needle Nose Crimpers/Stippers: amzn.to/3fuwXlw
Klein Journeyman Pliers: amzn.to/3tvB60w
Milwaukee Slim Packout On My Torch: amzn.to/3KeLm3j
Aluminum Packout Wall Mount on torches : amzn.to/3Kf9hQg
Milwaukee Tool Box: amzn.to/322iyK9
Veto Pro Pac Tech MCT: amzn.to/3nwwQdA
Milwaukee Hook Blade Knife: amzn.to/33F3m5T
Testo 300 flue gas analyzer: amzn.to/3IcS3Bd
Western Nitrogen Regulator: amzn.to/3rmdKrx
Klein Canvas Bucket: amzn.to/3FyzKVf
Flag Velcro Patch Kit: amzn.to/3K8Eswx
Supco Magnetic Door Switch Holder: amzn.to/34IcXcL
Milwaukee Magnetic Light: amzn.to/3FulCfF
Milwaukee Rechargeable Headlamp: amzn.to/3nuXsvf
SS2 Float Switch: amzn.to/3K7LJMW
3-Amp Breaker: amzn.to/3nxaSXJ
Appion Valve Core Removal Tool: amzn.to/33CFArw
Appion G5 Twin Recovery Machine: amzn.to/33Dvd6C
Yellow Jacket Large Tubing Bender: amzn.to/3qwJv1U
Similar Small Tubing Bender: amzn.to/3fJsziJ
Fluke Twist Guard Test Leads: amzn.to/3216R6j
Fluke 975 Air Meter: amzn.to/3GwD9oM
Honeywell T-4, 2-Heat, 1-Cool Programmable Thermostat: amzn.to/3qtIuaX
Kidde Carbon Monoxide Alarm: amzn.to/3qtIIyP
SolderWeld Flame Resistant Magnetic Blanket: amzn.to/3qtJ4Wb
Malco 1/4 - 5/16 flip bit : amzn.to/3nr67yU
Quick Check Acid Test: amzn.to/3GA2XAy
Aims Power Inverter: amzn.to/3qOSc87
Wiha Torqe Screwdriver : amzn.to/3u1swH6
Wiha Torqe Screwdriver 1/4” adapter: amzn.to/3IH22Pw
American Flag Gator : amzn.to/3rKBl5u
Compressor Tote: amzn.to/3H8xHst
Inspection Mirror: amzn.to/3r9PERV
Wiha TorqueVario-S 10-50 in/lb Torque Screwdriver : amzn.to/3GbKAku
1/4” adapter for Wiha Torque Screwdriver : amzn.to/3u8g0pq
For the Western Nitrogen, Oxygen, and Acetylene Regulators visit Trutechtools.com

Опубликовано:

8 мар 2022

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 95

@chrisfranco4845 2 года назад

Did anyone else not notice his black lead on his meter was off when he was checking for call on cooling at the condenser?

@ParabellumX Год назад

Wow! Yes, at 2:40, he attempts to test for 24V coming from the thermostat, but his black negative lead fell out just before doing so! I bet after he saw your post, he was like, 🤦‍♂. 😆

@PIndyJones 11 месяцев назад

Yep. And he wasted probably 15 minutes of his time going back in to see if he had a call at the board, subsequently killing power and had to wait for the 5 minute delay. Lmao.

@angiespencer4156 Месяц назад

Mark the yellow wire then pull the wire you want either direction and see it move,easy 😊

@dylandrymond3839 2 года назад

I suspected charge after I heard the compressor on the initial start (1:45). The 5 sub is way too low and needs to be around 10-18 or whatever the panel say's. The quick and best way to check a txv is to pull the condenser fan wire outside and watch the suction pressure. The increase of head pressure is normal after motor stops but the txv should maintain the suction pressure with little to no change. If the pressure stays about the same then the txv has proven itself to be working and if the suction pressure increases as the head pressure increases, we know the txv is bad. This test takes 60 seconds and can actually be used on PM's to test them before cooling season. Try it a few times and get the swing of it. This is a quick accurate way and keeps techs from having to remove the sensing bulbs. Extremely accurate. Thanks for the clip.

@Sctronic209 2 года назад

I agree on raising the head pressure. That’s the only way I will charge a micro channel with a TXV. I know this is not a micro channel but bagging the condenser will sill work.

@SickaMorStyle 2 года назад

Good tip thanks. I’ll try this going forward

@godz1llaki11azzzz3 2 года назад

thanks for the tip

@olurotimiadepitan5087 Год назад

How do I pull condenser fan wires to check pressures when system is running? Do I shut it down, remove fan wires then switch it back on?

@dylandrymond3839 Год назад

@@olurotimiadepitan5087 remove one of the high voltage fan wires

@FrostHVAC 2 года назад

one of my co-workers gets mad at me bc I find a lot of bad TXVs, I get the running joke, but yo sometimes these TXVs suck, and it's like almost scary to say it's a bad TXV bc people will assume you're wrong. I've seen a low on charge unit w/ a bad TXV, how I figured was when I added gas, my suction pressure did not change at all, tis one of my tests if I'm really doubting myself. Great video

@bryansimon4072 2 года назад

Txt didn’t move when you warned it. Problem found. Nice

@deanmartin1966 2 года назад

Probably the txv. Frosting up at the txv. If its stuck open I could see the low temp on the liquid line. High superheat and low subcooling, I might of tried adding a little freon to see if it changed the subcooling any. If it was working fine before and you didn't find any leaks, I would say txv. Did it have a low TD? Good video. Love the tough ones. Love this channel. Truly one of the best.

@johnwalker890 2 года назад

Good job Curtis.

@Sctronic209 2 года назад

Excellent job.

@ParabellumX Год назад

I know you know what you are doing; there's no telling how many decades of experience you have in our field. But I have a question... Why didn't you check air flow and static pressure before checking the charge? You didn't even check the air filter. The reason I ask is because that's what we're taught in school, is E.A.R. - Electrical, Airflow, Refrigerant. Just asking! Love your videos, big guy; keep 'em coming!

@denrayr 2 года назад

I think the low ambient is throwing you off. You should have more liquid stacked in the condenser since it's so much cooler outside than inside. My money is on low charge. I'd stop the condenser fan to get the head pressure up to see how subcooling and superheat react.

@tphvac87 2 года назад

You tested the low voltage at condenser with less unplugged from your meter 😂 done that a few times myself, the first time you tested it

@HVACGUY 2 года назад

I didn’t notice. But, you’re right.

@throttlebottle5906 2 года назад

whoops, good catch!

@Bryan-Hensley 2 года назад

Diagnosis of a Txv is the hardest I think. Especially since it's too expensive to dump in a couple of pounds to see if there's a difference. Warming the bulb won't do anything since it's already maxed out in temperature at 75 degrees super heat. I had to pull out the gas and weigh it just the make the call on one system, however I had to remove the gas anyway. It was the heat side expansion valve.

@keovongvilaykeo4799 2 года назад

Great video thanks again always

@jamespatrick9449 2 года назад

Pretty cut and dry from what I seen. No need to over think it. Good job.👍

@tims.5995 2 года назад

I use a spring clamp and a short piece of a paint stirring stick to hold in door switches.

@ahinnaynoble6938 2 года назад

I've learned something new . i didn't know you could jump the contactor to got it running.

@1ndependenceday1 Год назад

Yes you can do that all need is 24v to jump 24v side of the contactor

@MariosACandRefrigeration 2 года назад

pump it down,remove valve check for debris,if not install piston and test.but if you carry a valve change it.good video.

@donaldpainter956 2 года назад

I've replaced 20 txv this summer that's a very common repair but sometimes the txv oil will unstick them and trane will warranty their txv oil for the repair I've used it several times and it worked I wouldn't try it on an old unit but a newer unit yes it's alot easier than replacing the txv

@Austin23191 2 года назад

This past week I had a tane ac that wasn't cooling right when it got 80° last weekend. 38° superheat and 9° subcooling (rated 8+/- 3) at 45° outside. I was pretty sure it was the txv but I decided we needed to double check when it was warmer. I'm not gonna be "that guy" who always blames the txv

@charleswashington7576 Год назад

The pressures didn't rise on the bulb test. Bad txv. The system may still have a leak and low charge that caused the valve to stick.

@denisvigil4558 Год назад

If the temperature was above 65 degrees. I would say your diagnostic is correct. Seeing how the outdoor ambient is 54 degrees. I find it hard to believe the txv has failed. Ac should not be running below 65 degree ambient both indoor and outdoor. This is due to low vapor refrigerant in the coil with low temperature airflow blowing across the coil. There is no load on the system. Causing the txv to meter down the amount of refrigerant in the coil. Causing a high superheat. Also tried to restrict the outdoor unit fan to drive up your head pressure, while rasing your subcool to verify. When low ambient conditions apply.

@michaelkuprian01 2 года назад

I have been in those cases and I weigh out the freon. If freon doesn't meet factory charge it's low. Weigh in proper charge and then see if it's still doing it.

@Bryan-Hensley 2 года назад

With the price of r410a being so high, I've been doing that lately

@ojosverdesrvgt 10 месяцев назад

I had several situations similar to that, had to pull a pump down and remove the strainer just before the txv and on most cases the strainer in there was clogged, clean and reinstalled and issue solved

@dporrasxtremeLS3 10 дней назад

Thanks! I did not know there is a strainer under the TXV. I am having the same issue.

@edwindudoussat1279 2 года назад

Mechanical contractor here 40 years in the business. Bad TXV and water heater vent is just fine like that.

@DS-fb9te 2 года назад

Listen to years of experience. Will save you headaches at the end

@jericosha2842 2 года назад

I found that a small magnetic screw holding bowl works way better than that tool. Plus it doubles as your screw holder. I love to add a little 410a to watch if the low side drops, which confirms a restricting TXV. Of course that's a more expensive approach.

@georgesummerlin1602 2 года назад

Always when in doubt shoot it with a little fridegrant..

@Bryan-Hensley 2 года назад

@@georgesummerlin1602 it's doubled in price over the past year or so.

@mattbilodeau2433 2 года назад

The price is insane

@tedhicks5431 2 года назад

Was high low pressure balanced out before start up or if you turn unit off does take for ever to balance out pressure txv are tricky like reversing valves

@Korrea00 2 года назад

I don't know if there is a follow up video. But because the clothes dryer is not venting properly could the coil be clogged from the under side?

@chesstime356 2 года назад

Great

@everithinghvac1895 2 года назад

I was sold on the TXV once you grabbed the bulb in your had and no change happened. I'm totally on board on this one.

@jrsmyth9761 2 года назад

Most likely you did not need to make that jumper. The power was most likely at the wire nut on the yellow wires and if not you could determine which switch it was by continuity or low voltage.

@hotfares1 2 года назад

What was your delta T?

@smacleod69 Год назад

I see you didnt noticed that the black lead on your meter was not plugged in when you first checked the voltage at AC.

@user-cz8km3zc4t 10 месяцев назад

Where did you get your tool bag ?

@chrissipple1018 2 года назад

what do you mean that the txv is locking down

@philosothink Год назад

TXV;'s are the bane of my career... so much brazing in tight quarters!

@IALewis 2 года назад

The first time you checked for voltage outside your meter lead was not in the meter.

@billyk5107 Год назад

I use tape for the door switch and why aren’t the pressures equal the units not on I think we’re on to something

@moonlightacmaintenance3232 2 года назад

I would check and resolve two things first. Address the return and check blower wheel that thing was shaking pretty good is it packed with dust and hair or am I just seeing things. I’ve fixed two units in the last year that were both txv’s. One I was able to swap the power head and as soon as I did you could hear the refrigerant flow from one side to the other side of the unit. It sounded like a reversing valve.

@moonlightacmaintenance3232 2 года назад

After you stopped it did the two sides try to equalize? It didn’t appear to in the video.

@HVACGUY 2 года назад

@@moonlightacmaintenance3232 no, not at all

@juni3301 10 месяцев назад

Hey guys! I think that the evaporate coil was installed wrong. It should be upside down and shaped "A" corn. Am i wrong?

@Bruce19 2 года назад

Maybe they forgot a Schrader in the bypass port, I've seen that a couple of times

@DJV94022 Год назад

Hmmm? Is thats at th3 condenser right? The inside txv it shouldnt have a shreder valve?

@JCM2LA 2 года назад

To me it looks like the valve's power head lost it's charge.

@SupremeRuleroftheWorld 2 года назад

its never the TXV, unless when it is.

@Ricky32908 2 года назад

Sensing bulb lost its charge, not sure what’s been going on at quality control, but they need to start taking thickness of their coils and TXV bulbs. I’ve seen some coils leak because the metal was too thin, it just gave way through the seasons. Expanding and contracting, will make any coil or bulb leak if it’s too thin. There are thickness gauges for paint coating, wouldn’t hurt to test thickness at common places where leaks happen before shipping it out to the customer

@ReliableHVACR 2 года назад

It's always the txv 😂

@DJV94022 2 года назад

In the car world specially hondas the distributor 😂 or fuel pump for everything else

@DJV94022 2 года назад

Does anyone else use a long flat head and put their ear on the txv to hear if it opens and closes?

@realestateservicessaleshea99 2 года назад

Trouble shooting 101 also use a cup of ice and water. Thanks again for the videos! 🥃🥃🍺🍺🍺⛳🎳 Stay safe. Retired (werk'n)keyboard super tech. Wear your safety glasses!

@robertcherry4971 2 года назад

Check the screen,before the TXV.most likely obstructed.

@donaldtheacguy829 2 года назад

I think you're right on the TXV. It could be slighly low on refrigerant too, but the fact that the valve pinched and stopped the suction pressure at 77 while compressor was off says something is going on. I'd say a partial loss of bulb charge. If the valve were working correctly and the charge was just low, the pressure should have done more equalization before the valve started to close. Hey, what ever came about of that HP that was tripping off on high head that you suspected indoor valve?

@HVACGUY 2 года назад

Not sure. I don’t know which video you are speaking of

@Kilcrops0914 2 года назад

With a 5 degree subcooling there's no way your suction pressure would be that low. TXV it is

@allanbrito13 Год назад

It can be. Depends how hot it is outside though

@ignacio8597 2 года назад

What is it Rheem city down there? It's all I've seen in the like 5 videos I've watched of yours.

@J0341sanginD Год назад

Rheem dealer

@orange_ash6902 2 года назад

12:22 lol wtf man. That’s how you get a backwards running compressor and a chared up contactor

@holtrussell 2 года назад

May have missed it, but any chance the filter drier could be your restriction?

@SickaMorStyle 2 года назад

I believe he said 64 on both sides

@DJV94022 2 года назад

14:39

@TheWilber09 2 года назад

I'm sitting here debating with myself. Did the bulb lose its charge? Is the txv piston stuck? Is it low on refrigerant or a combination of a couple of things?

@Bryan-Hensley 2 года назад

Usually bulb loses charge. Rubbed hole in the tiny tube or diaphragm is leaking. That's why the more expensive txv like sporlan have replaceable heads. But diagnosis of a Txv is the hardest thing to me.

@TheWilber09 2 года назад

I question it because typically, the low side pulls all the way into a vacuum or real near and will "stack" liquid and give a pretty normal subcooling. Maybe this one stuck open just enough to feed to keep that from happening from a lost charge in the bulb. I guess we will find out.

@Bryan-Hensley 2 года назад

@@TheWilber09 the diaphragm is most likely leaking. Which causes the valve to restrict the freon.

@stephwaylonwells3218 2 года назад

👍

@juntang72 Год назад

Nothing wrong with the system. Outdoor temperature is 57 degrees, thermostat won’t able to turn it on for cooling call. Even we could force units to work, you will see high superheat because of very low heat load. Also we need to figure out sub cooling for TVX , he said it’s moderately low, but not extremely low , considering the outdoor temperature 57 , so Txv is good. Nothing wrong with whole system.

@KoolinwithKrauss 2 года назад

When is it NOT the txv 😂☠️

@TimSmith-yi9zv 2 года назад

Wondering if anyone noticed. When at first checking for a call outside on the control wiring. The negative test lead wasn’t in the meter until afterwards he was putting the meter away. Oops