Refrigerant Overcharge Troubleshooting and Prevention
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- Опубликовано: 20 июл 2022
- Bryan teaches a class about how to identify and rectify HVAC problems that stem from overcharge with refrigerant.
When we charge systems, we typically add refrigerant via the suction line when the system is running. (You can only add refrigerant when the system is off if the system is under vacuum and has no refrigerant at all.) It's easy to overcharge systems with accumulators, as the accumulator may store liquid refrigerant before it gets to the compressor. People also may overcharge systems if they don't let the system equalize, if it's cold outside, or if the airflow is poor.
You can't tell if a system is low on refrigerant from suction pressure alone, and some technicians may overcharge a system with refrigerant if they see low suction pressure. Technicians are also more likely to overcharge a system if they don't weigh in the charge with a scale and don't give a system time to equalize. Systems that have different stages of operation also need to be run at the highest stage during charging; failure to do so may lead you to overcharge a system.
When you add refrigerant, it boils in the suction line and goes to the compressor, where it becomes pressurized. It becomes a subcooled liquid in the condenser and goes to the metering device. As the pressure drops in the metering device, some of the refrigerant will boil off. The metering device ensures that the evaporator is fed with refrigerant (and maintains superheat in the case of a TXV).
When there is too much refrigerant in the system, some of that refrigerant will back up against the metering device and "stack" in the condenser. So, the head pressure increases, and the condenser becomes less efficient. As a result, the main symptoms of refrigerant overcharge are high head pressure and high subcooling. (However, a clogged condenser coil may also result in high head pressure and high subcooling. A visual inspection will often allow you to distinguish dirty condensers from overcharge; finding the differential between the liquid line temperature and the ambient temperature can help.)
Low suction pressure is NOT a telltale indicator of low charge and likely indicates a restriction or poor airflow. So, we need to focus on multiple refrigerant readings and focus on the state of the airflow if we come across low suction pressure. Suction pressure is also not a good charging indicator.
Read all the tech tips, take the quizzes, and find our handy calculators at www.hvacrschool.com/.
Heating blanket lol. Sure..
Really good information
We need em up here in the far north. But yes a quite hilarious thing to suggest as a standard thing on your truck.
He is trying to provide real education for free??? Wow. That's like genuinely trying to help. Exceptional professional
Seriously a great resource for new guys. Thank you so much for sharing this for free!!
You can also add refrigerant when the system is off by using your recovery machine in reverse. 410a i use a charge compensator with filter driers on the inlet and outlet ( if recovered refrigerant is being re-used ) or if its virgin refrigerant just hook your tank of refrigerant on the inlet and the equipment on the outlet. It'll get it all in there quickly. On commercial equipment this is done a fair amount of time.
Thanks for the tip.
Also helps get every last ounce out
All the time, especially on larger charges.
Might sound like a stupid question but wouldn't that slightly increase the pressure and maybe a slight chance of introducing non condensable
Thank you for adding "text" on the screen of classroom audience comments. In the past it has be very difficult to hear their comments, being away from the microphone.
Also, subcool will go down when the house is hot. If you charge to 10° subcooling when the house is 90° and go back when the house is 70° the subcooling will be much higher. The TXV will throttle back when the heat load across the indoor coil drops.
Yup, seen this happen on many walkin coolers, if they have a food delivery, and prop open the door, and bringing in tons of product and the kitchen is hot, the big demand on the coil can result in sight glass flashing for a bit. But clears up in a minute when they finally close the door. Same with a house, if the house is 90 degrees, that TXV will have to be wide open just to keep the superheat under 30 degrees maybe, and it's trying to maintain roughly 10 on average at design temps.
Great explanation on charge Thanks .......yes sir ....get in to big of an hurry adding charge to an running system & not waiting long enough can easily quickly over charge one
Helped me in diagnosing our chillers issue that has an accumulator and hot gas valve that helps boil refrigerant after the txv before hitting the evaporator water box
Absolutely love this channel. New tech. Graduated trade school last year. Been in the field about a year. These videos have helped me so much. I listen almost everyday. Thank you for the knowledge. 🙏🏾
The better I become as a tech, the more helpful these videos become. Hmmm
New to the career field, teachers at my school don’t teach at all. This helps me understand a lot more. Thank you
Up here in the northern states, piston metered coils are still readily sold (13 SEER). I can't tell you how many systems I've come across that were overcharged by a previous tech because of a blocked metering device. They see high subcooling and high superheat and have no idea what's going on. Forget about reading analog gauges. Then that tech condemns the condenser. What I've seen, in my 10 years of working in the HVAC field, is little shards of solder or braze stuck in the center of the piston. When the restriction is removed, either by taking out the restriction and/or replacing the piston with the correct size, that system works as intended. I honestly think critical thinking has gone away and if it's not in a textbook some techs are lost.
I was so attentive during your lesson. Thanks from Bangladesh.
I love the calmness and the way he explained how it works
Unloaders on the Compressors! My favorite analogy of the metering device is a traffic jam. Everyone is trying to fit through the one open lane and you’re in a high pressure but when it’s finally your turn to get past the wreck, the traffic is spread out and you’re free to drive without running into anyone. So that’s a low pressure. Or it could be a fire alarm In a building and everyone trying to escape through the same door. Great video! As always!
I don't work on HVACs, will never work on HVACs, have no interest in every working on HVACs, but find these videos' fascinating to watch lol. Really enjoy learning how it works.
I for one appreciate your position and you're still doing the right thing though because the mere exposure to this will give you peace of mind when you "call the man" that you wouldn't otherwise have...as long as you don't let the Dunning-Kruger effect get the best of you. lol Understanding your own system as much as possible is very helpful. The upside is we don't have to learn them all like the trades people do. I have prevented service calls for intermittent problems from going south by having gained the most thorough understanding of the symptom (not a hypothesis about the cause) that I could before making the phone call. Understanding your particular system will give you further insight into how to observe a symptom when you have it.
Tradespeople here please feel free to correct, criticize and/or just plain ridicule if you wish.
Very informative. Good teacher. Excellent techno speak.
I really wish I had you as my teacher years ago Would have loved to have worked there. Thanks for your time
Very instructive video. Thank you for your teaching. God bless
Such a great teacher! Its a treasure for us on our learning curve!!
These principals make this a watch more than once video
Explains it very well..
thanks so much for this interesting explanation for AC
Great i'm new in the field, and i'm learning a lot from your videos. Thank you!
I am a homeowner in Minnesota and getting addicted to these teaching videos by Bryan. My AC recently, on a very hot day, was constantly running but not cooling enough. I called the pros, and the technician came in and hooked his meters to the outside unit and immediately told me that the pressure is low, and there must be a refrigerant leak, and I needed to get another company to do a leak test on the system because his company doesn't. I brought in another company where they pushed the refrigerant into the compressor, and tested the coil with high pressure nitrogen where they found no leaks (no vacuum was pulled after the pressure test). Then they unsuccessfully tried to charge the system and concluded that the TXV was stuck shut. I didn't feel that the tech was confident in his assessment, so I requested to get a more senior person to assess the issue, he quickly added one lb. of R410A and ran the system for a while but wasn't able to get the superheat below 20 degrees, and he thought that he over charged the system, so he reclaimed some refrigerant but only dropped the superheat to 17 degrees, at that point he concluded that the TXV is stuck closed and told me that I need to replace the coil. The system is less than three years old. Do you guys agree with his assessment? sorry for not providing all of the technical information as the I haven't gotten the lingo down. Thanks in advance for your opinions and advise.
go away
You are a great teacher! Thank You very much! Greatings from argentina
Thanks!
I was wondering if you could explain a cascade refrigeration cycle. Your videos are very helpful and have helped me a lot over the years. Hopefully you see this!
I grew up with this guy and he actually doesnt know anything about ac's. If you watch closely, you can see him reading the telepromter. Sidenote: he also had a lot of weird habits like leaving farts in peoples mailboxes.
Love it brayn u made me professional
Best hvac content
Great video as always 👍
Thank you bryan ore for another good video
If the air feels cold when a ghost is present, the Ouija board may work as a cheap air conditioner system.
Do you have any videos or podcasts on zone system problems in multi story homes? And how to overcome those issues?
Awesome teaching. Also measure Compressor power , it will increase than rated value.
I like to think of the droplets discharging from the TXV as an actual cloud of refrigerant.
Got it. Suction pressure is the only pressure you need to watch.
this is a great video. I wonder if this is what i got. my home hvac use to blow super cold one day we had electrical outage and then it blew cool, had 3 different hvac companys come out 2 of them both added freon still blowing cool the 3rd guy cleaned the condensor outdoor still same issue. found a video on youtube that maybe the txv valve was plugged with varnished oil. the temp fix was run the heater so it will heat up the txv bulb then run the ac to get the oil moving but only worked for a bit. if i go outside and put water on the condensor coil it gets the ac really cold for a few min but back to blowing cool air.. it does the job has the 20 degree split but does not have the cold bite it use to on a hot day it cant cool the house it feels muggy if there are to many people in living room.. and wont go lower that 76 when b4 it use to go down to 73 on a day when its over 100 any advice?
Overcharged systems compressors will also draw more current, and in extreme cases trip on HP or even I have seen a Rooftop trip a breaker because of overcharge
About to get back in the field after being stationary for a year and this is a great refresher. Also: Who doesn't use a scale? How can you charge for how much refrigerant you added if you don't have a scale? That's just giving money away!
Very nice,but do we have a practical problem when there is more refrigerant in our unit?
Thanks 🙏 bro
Does temperature outside (93) and another reading at (75) cause a low freon indcation at low temps and high feon indication at high temps?
Hi i have high superheat so add more refrigerant to txv system. But the subcool is decrease and liquid line temp increase.
Excellent teacher. I would love to talk to him and ask questions.
Free tip. Buy a ryobi 600 psi cordless pressure washer I haven’t taken a condenser jacket off in 2 yrs
If the suction port was damaged, I’ve turned it off and used a propane torch to feed a few ounces in. Then turn it back on and checked again. For small refrigeration anyway.
Can anyone explain why the bottom of the refrigerant accumulator would have ice building up on it (climbing up the accumulator over time) ? Our tech that was just out said he put an extra lb in our system so it's topped off. Is this a symptom of overcharge ?
Micro-channel condensers... What is the best method to wash these and prevent them from getting 'waterlogged' and blocking airflow.
I've been tryna wrap my head around this stuff for 20 years. I'm just a dumb bakery owner.
hi, what average pressures should i see on my gages vs ambient temperature.
I just had a unit today. R22 capillary tubes, 32° subcool 1.8 superheat. The customer was saying it was tripping the breaker. Could that be another symptom of overcharge? Thanks in advance.
I got a question. I have a non-inverter mini split and there is only a port on the suction side, no port on the high side, and so there's no way for me to know what the head pressure is. I seriously doubt it uses a TXV and it's definitely a fixed orfice. How do I know if it's overcharged? Because oftentimes I will add refrigerant and the suction pressure will be just below freezing (about 45 psi for R22) and it stays there no matter what.
So far I have not heard of a 3 zone system or 2 zone system, or a mini split with 2 to 4 or 15 heads etc. Withch in turn is just like a 2 stage unit, Total charge, this business changes like cell phones.
If I had a little too much freon in a typical residential ac unit would it make my coil not as cold as it should be?, Or are the only negatives are waste of freon, not as efficient, shorter life span. Sounds like that's the case, which would make slightly too much is better then slightly too little.
In a pump overfeed recirculated evaporator the refrigerant should leave?
I had my seer 12 unit replaced by seer 16 (same manufacture) unit. With the new unit I have to lower the thermostat by 4 degrees to have the same level of comfort. With seer 12 unit I set the thermostat at 80 degrees, With the seer 16 unit I have to lower the thermostat to 76 degrees to get the same level of comfort. Any idea why I have to lower the thermostat with the seer 16 unit? Thanks
Keep your heating blanket close to your recovery rags.
Due to overgas charge
Is it possible to ice build up on suction line?
Please reply
sorry i have a question i have a vw golf 4 and i change the (filter Dryer thingi) and i put new freon and oil in the system soo sombady help me i well to know when i need again to renew the (Freon Gas) ?? ewery 2 year ewery 5 year never ??? sorry for my bad EN langunge big respect from Montenegro
Can u overcharge a unit by there not being any load let’s say it’s 74 inside and thermostat is satisfied but u drop the temp to check the levels could that mess u up
When refrigerant overcharger, its cause compressor current overload, high pressure at condenser unit, high pressure at evaporator and suction line. Supperheat low, oil & liquid comeback to suction line. Subcooling low.
You can use the recovery machine to charge a large systems
After recharging my fridge, the suction line is freezing with ice while the fridge itself is still taking too long to freeze and cool. Did the technician overcharge it?
My rule of thumb when I add refrigerant on a system when still on vacuum is 50psi. So far haven’t been off more than a couple of degrees the superheat
is this a real class btw school or a evening training ? we have school and practice for 3 and a half year. with theorie and praxis
In automotive air conditioning they have a system where you can suck the refrigerant out of the air conditioner and into a storage tank and produce a good vacuum. Then they zero out the scale and then have it start pumping the refrigerant back into the air conditioner until the proper amount of refrigerant by weight is pumped back into the air conditioner. All with the car engine not running
Is there any reason why you can not do the same thing with home or commercial air conditioning systems? If you know how much the system is suppose to have, and it should be written down where the access ports are, you should be able to use a refill pump like they use for auto air conditioners to pump refrigerant into a home or commercial air conditioner system.
Those micro channel condensers are super easy to overcharge.
They're designed to hold very little refrigerant. I had to replace a microchannel coil on a Bohn low temp freezer condensing unit a few years ago that has a flooded head pressure control. With RTPF (round tube, plate fin) condenser coils of this size, it's normal to charge to a clear sight glass, then add an additional 4-6 pounds of refrigerant to the system for it to work properly in the wintertime. But I looked up the manual for this unit, and it only calls for 1.1 pounds of additional refrigerant, because that's all it takes to flood the condenser in the winter! The previous installer had added way too much refrigerant, and the combination of that, plus a dirty coil, plus a hot day busted some of the flat tubes where the aluminum is soldered onto the hot gas header.
So, they're also super easy to damage from a gross overcharge. The Trane microchannel coils haven't been too bad, but some early adopter manufacturers were (and maybe still are) nothing but trouble and quite leaky.
@@brnmcc01 I agree. Super easy to over charge especially in cool weather. Every ounce matters. If you notice, all the AC units have a head pressure switch. I’m surprised your machine didn’t have one. Us old timers are used to the AC systems that have a slow leak and just need a pound or two every year and they’re good for the summer. Can’t do that with micro channels because if it loses a quarter pound, it’s not gonna cool well. And if you attempt to overcharge it a quarter pound to make it last longer, it’ll hit the hps. I’ve heard people say it’s not safe to pump down into one of them, but I figure if it was pumped down when the unit was new, it’ll pump down now. I did practice with a scrap unit to see if I could learn how to solder and repair one of them. No luck at all. I’ve repaired plenty of tube and fin coils and even all aluminum. I really don’t like these, other than they’re easy to wash.
@@brianlittle717 It does have a high pressure cutout, but I think it's the self resetting type so the continuous flexing of the microchannel over and over finally caused metal fatigue cracking, and then the system basically pumped itself out. The low pressure cutout on a freezer is only set to 5 psi, so when I got there, the system was completely empty. Coil was covered by warranty from Heatcraft, but the 10 pounds of R404A wasn't cheap... As far as repairing the coil, the cracks were pretty buried and not very accessible, plus it still had a couple months of warranty left. They are easy to wash, even 12.5 ton Trane voyage units the microchannel coil is single layer, so it's infinitely easier to clean, than having to take the top off to split coils on older versions.
@@brnmcc01 yes it’s definitely easier to wash than the Slip coil voyagers, but I’d rather have those old units any time. Those things were built like tanks. That makes sense that it burst because of short cycling. That’s bad on the compressor and everything else. I prefer the manual reset hps switches. And you’re right about the lps on a freezer. It pumps down and the lps controls the compressor, so even if it’s got just a little bit, as long as the solenoid is open, it’s still gonna cycle.
In Goodman 2 stage communication system you have to run compressor at 1st stage to charge
Yup we learnerd thay after a few installs
hello sir how to know if i have a problem in compressor valve
A lil bit offtopic question, for DIY house installation of small split unit, can I use CO2 instead of nitrogen to check for leaks? I happen to have CO2 tank and as far as i know its pretty inert gas? Will it condense when pulling vaccuum ?
Absolutely not. Co2 adds moisture to the system which is a huge no no.
@@voretex4202 I see, thanks for answer!
@@voretex4202 Well Co2 is a new modern refrigerant. It's not the Co2 part but the moisture content in the cheap Co2 bottles. The nitrogen sold by one UK refrigerant company has some low moisture as well. I buy a scientific nitrogen gas with a lower moisture level in the specs. Cheaper and I own the bottle.
On a Goodman two stage system you charge it on first stafirst stage
Compressor will over amp . Carrier commercial splits have to separate cond coils remove those clips its a lot of fun!
Legit Question: Why in the install manual for Amana 2 Stage ASXC systems does it say charge unit in first stage?
The engineers are thinking with a properly sized system, it will be running in low stage most of it's working life. High stage is just for those few hot days during a heat wave, high occupancy load from a house party, or recovering from setback when they get home from work etc. It's also more intuitive for the homeowner that doesn't understand how HVAC works. But they will like it if they really crank the thermostat, the system will 'rev up' and run full blast and cool (or heat) the house faster. Once it's at or near setpoint though, we want the system to run as efficiently as possible so the charge should be right on the money on 1st stage in order to achieve this.
8:11 what do they mean with high stage? I'm not natie English. Really usefull video's btw. Thanks alot.
Can i use thermal camera on conderser to detect over/undercharge?
No not really. It looks the same as a high load proper charge. You can see more of the tubes glow brightly yes but it looks the same when under heavy load. I'm not able to tell anyway
Hi I need help with my car a.c it have 100 plus and minus 50g I have no idea how much is that anyone know how much gas is that
Lennox does the double row coil in residential
When did they start that?
@@jasonjohnsonHVAC I want to say since they started the Dave lennox signiture series
Carrier 13 seer 4-5 ton also.
Just assume the condenser is clogged. No one ever cleans them.
I'm not a refrigeration tech but I work on cars. When the high side gets too high pressure it just turns off the compressor till the pressure drops. It doesn't keep pumping it. Don't building ac work the same way?
Most quality systems have high and low-pressure valves. Because of the potentially dangerous high pressures, a car engine compressor could create a High-pressure switch is a must.
At about the 13 minute mark you state the increased pressure of the liquid stacking up behind the txv has an influence on it.
Why?
The txv bulb on the coil manifold, or suction line, is opening and closing based on the temperature of the refrigerant exiting the indoor coil.
Is it your position that the increased pressure of an overcharge drives more liquid refrigerant through the txv opening than a properly charged system? If so wouldn't it only be for the amount of time it takes for the txv to react, because it is based on SH.
If so, then a dirty coil or failed/failing condenser fan motor would produce the same effect, as would high ambient temps.
He meant that it forces the TXV to throttle, he explained it only briefly but if you watch the animation closely during his voiceover, you can see the cutaway txv closing down.
@@brnmcc01
Why?
If the opening/closing is based on the temperature of the refrigerant leaving the coil, as sensed by the txv bulb, what influence does the stacking liquid refrigerant have?
@@jrsmyth9761 Higher pressure differential across the valve means more refrigerant will flow, resulting in the TXV closing down to compensate. Think of it like trying to regulate a sink faucet to exactly 1 gallon per minute of water flow, and your water supply is on a well pump system. If the water pressure drops, you need to open the faucet more, and if the pressure starts to build when your well pump turns on, you'll need to slowly close the faucet to maintain the desired flow. The compressor in this example has a fixed speed, so it can only handle a certain flow rate of refrigerant.
@@jrsmyth9761 more cold refrigerant means more capacity to absorb heat. If there's not enough heat but you're pushing in lots of liquid vapor, there's a chance that doesn't completely boil by the time it reaches the end of the evap and your sensing bulb which means 0 superheat. So the meter reacts by closing down some more. Also remember pressure equals temp so if the liquid coming in is higher temp (pressure) because of an overcharge, what is metered in by the TXV won't have the capacity to absorb as much heat so it might dump more in to bring down superheat but then goes too far and chases it back up and the cycle continues as it opens and closes.
Overcharging because you are relying on the sight glass to remove bubbles.
👍👍👍
I was expecting to hear when you add gas refrigerant instead of liquid or when you can do that
Excellent videos as always. Just watching a plumber on RUclips changing a compressor on video.
He can’t understand why and was literally boasting how the amount of Attar charge that he had to add that he felt was correct was literally more than the entire condensing units factory refrigerant charge.
I was literally ripping my hair out and wanted to say something but this particular famous RUclipsr makes so much money Office plumbing business and just recently got into air-conditioning and sells new units all the time when they don’t need to be replaced he takes offense to being told what he should do or should not do so I said nothing.
I just guess they’ll be replacing another compressor next year or two. He could buy more gold chains.
Lol. According to him he is a Doctor of Pipes
@@jasonjohnsonHVAC 🤫 no names. But he’s making the fat cash stacks 💵 $100 bills 💸 selling all those systems needed or not.
(it’s not about the quality it’s about who has the fattest bank account at the end of the night and can sleep good $$$ ) 😓 according to some 🤔)
@@coldfinger459sub0 to each his own i guess. We live by different rules of ethics. You are old school and i came in learning from old school 30 year vets. I am grateful that there was still a lot of old timers around. I started in the late 90's. Seems nowadays its rare to see old school guys out in the field. Im probably one of the oldest where i work, but everyone here is very talented and knowledgeable. The young guys who haven't learned a lot are bright guys you can tell will make it, and become real good techs. I really am enjoying working here. You are encouraged and expected to do things correctly and take your time to get it right.
@@jasonjohnsonHVAC it’s difficult define honest and guys who actually wanna sacrifice and work in this trade to do things right.
Too many salesman in this industry who just wanna make high dollar sales and make money. Take short cats everywhere they can and upsell for higher profit margins attending the seminars and webinars Gerentine their company to make an extra 300% or extra 1000% in profits.
Unfortunately it’s not illegal supposedly to rip people off and we’re not allowed to take them out back and execute them. For some reason I don’t know why. 🤷🏼♂️. I think white collar crime should be met with capital punishment when we have these owners in our trade who can’t actually do the work themselves and are on capable and unwilling to train their own technicians. And turn a lot of these young guys into upselling salesman and based their pay on it.
And we all know that’s a recipe for disaster
And he loves those POS Chinese made Bosch systems
As someone who is just an average homeowner, is this noticeable when you start to get puddles of water underneath the AC condenser after a new install?
That might not be overcharge, just from low temperatures inside the house combined with a high outdoor dewpoint will result in a lot of sweating from the suction line and compressor body as well sometimes. With a properly charged system with the indoor temp set to 68 degrees or 20C, the suction line temperature will tend to be about 58 degrees, and when the outdoor wet bulb temp is over 75 degrees, it will result in a huge amount of condensation. Also if you do any kind of work outside in those conditions, you will also sweat like crazy!
You mentioned waiting till the coil is dry???
wet coil temps will throw off gauges
Just think of how, you would have a hangover in the morning and thirsty, thats how the coil feels when the txv is starving the coil.
you should change the way you draw it...
I use my recovery machine to get every last drop from a bottle. Actually works really well
“Discharge line is made of what?”
“Hot Gas.”
Really? I was under the impression they were usually made of Copper Tube Piping!
Would an overcharged heat pump in summer cause water to drip from underneath condenser onto the concrete pad?
This could happen on a correctly charged AND a slightly undercharged unit as well. The suction temperature of the outdoor unit can range anywhere from 45°F-65°F and the compressors are designed to use this to cool itself down. Of course, the colder the line the more condensation gets produced on the surface of the suction line and bottom 2/3rds of the compressor and after some time it will start dripping. Now each compressor and manufacturer are a bit different and you should get a technician with proper tools to check your charge. They need to check pressures, physical line temperatures, outdoor temps and if they are through, indoor supply and return temps to get delta.
The accumulator sweats something good.
@@jasonjohnsonHVAC I was thinking the same. However, a second identical unit at the same home does not drip any puddle of water on concrete pad. Both cool fine and their delta t are same (due to txv metering). So, does this mean that the first unit is overcharged and that too much liquid refrigerant is stacking in the accumulator and boiling-off and causing excess condensation?
@@MaMa-qh4dy - Suction line being beer can cold and sweating cold water is typically correctly charged.
@@Titus357 The puddle of water on the concrete pad is under the condenser. Thus, apparently the accumulator is profusely sweating with condensate and dripping into the pad.
What is a refrigerant in hvac
Depends on the system but for most newish homes it’s r410a
It is a chemical composition that allows for heat to be transferred from one location to another
@@chromelemon is refrigerant dangerous
@@jeremynguyen2346 Yes. You should not substitute it for cream in your coffee nor should you substitute it for mouthwash. It is also not recommended that you use the refrigerant for any sort of enema.
In the old days my father always used a sight glass to charge the system. I guess that is a no no now.
There are still sight glasses on refrigeration systems. Ninety percent are charged that way.
I see 410a systems with sight glasses.....liquid refrigerant is liquid refrigerant. Of course 410 is near azeotropic so very tiny amount of glide involved. I would think on more blended refrigerant with larger glides, you use the different points of change of state. I shoot for mid point temps.
When refrigerant over charge in fact the compressor motor damage
Superheat.
And over charge no more compressor and no thing happened any thing else
I over charge units all the time, impatient 👀 that Suction line temp goes from 61 degrees to 42 real quick 😂
Especially if it’s a piston orfice
And especially if it's a long line set. Nothing will happen so you add another pound. Then 10 minutes later the superheat goes from 25 degrees to 2 degrees real quick like you said.
Another thing I've noticed is when installing a new outdoor unit, on first startup it'll act like it's quite low on refrigerant for awhile. What I think is happening is a lot of the refrigerant is still dissolved in the compressor oil, and takes some time to boil off and then join the system. Seen suction saturation temps drop below freezing on initial startup, but have to just wait a bit eventually it'll start climbing. Overcharged a few new systems a little bit like that thinking maybe just needs a few ounces for lineset over 15 feet etc. 6 ounces for every 10 feet extra with R410 and 3/8" liquid line is a good starting point.
@@brnmcc01 open the suction valve first otherwise your overloading oiled refrigerant into compressor and it will do that, at least that's what I was taught
What happen when you overcharge a systems? Will it freeze the coil tubes?
Why are American AC systens so trash ? we've been using inverter driven compressors, head pressure control/variable speed fans for about 20 years, everytine insee American system they seem to be mostly square ugly trash units with fixed speed compressors and fixed speed fans.
🌟 𝐩яⓞ𝓂𝓞Ş𝐦