HVAC 108 Scenario Low on charge

[@bawipengcin]

Thank you again for your teaching and sharing knowledge. I have been studying, learning and working on refrigeration equipment for commercial and residential . I also learn from many teachers and you are also one of the best teacher. I wish I can take face to face class from you

[@tvcomputer8526]

so thankful for your passionate and knowledgable lessons.understanding the logic behind functioning of a machine is very important to fix it right

[@christopherbarrett6408]

This is a great educational tool and well organized. Thank you Sir

[@yakovminster3659]

The passion of the presentation is energizing.

[@samsmith854]

I’m rewatching all your videos now before I start getting a lot of refrigeration calls this summer. They help so much. Thank you again for everything you do Ty.!

[@love2hvac]

Thank you Sam. I will have new videos coming fairly soon! #nevsrstoplearning

[@yakovminster3659]

Thus guy is brilliant

[@nunyabusiness6746]

Excellent !

[@musakavalci9470]

Beautifully explained. 👍🏼

[@pedrojardim1163]

Thanks. Mr. Ty. For. All this. Videos 👌 And. Hard work

[@sonnguyen-ve7gn]

You are the best !

[@pedrojardim1163]

Perfect Teaching. Lesson. Mr. Ty thanks

[@love2hvac]

Thank you

[@mauriciojimenez6955]

I like your videos. Great explanation 👌 👍

[@MastercraftKARIGAR]

Your video showed up after a long time.

[@fasttimes6346]

Customer: hello my units not cooling good it probably needs some Freon

[@wendelbobb3584]

Thank you great explanation, any videos on ac electrical

[@adamedwards2435]

Maintenance... Maintenance... Maintenance! Clean your evaporator coil every 2-3 years. Clean out your condensate drain line once a year.

[@Balticblue93]

Did you change the name of your channel? I started watching the videos and I was wondering if you could make a playlist and starts from the very beginning and goes to all 202. I know there is a heating section too. I am EPA 608 Universal and one NATE certification, but I plan to take the two tests or the 5-HTP or whatever they call the five test set. I really like your training style. I am also in a famous HVAC school here in Denver.

[@love2hvac]

Hi Kevin! I did change the channel name. LOVE2HVAC fits with the rest of my social media, and the website. I don't want the channel to be about me, I want it to be about the trade. I have the videos set up in order in playlists. Learn HVAC HVACR from the start has the most and the gas heat and heat pumps are in their own playlists.

[@love2hvac]

That's great that your going for more certification but . Kre importantly that your learning and challenging yourself. Also look at the ESCO tests too. They have specific instructor tests and eventually you can be CMHE.

[@Balticblue93]

@@love2hvac I do take all the tests at my school and they are ESCO branded as that is where I got my 608. I have licensed here in Colorado as an HVAC technician. But I believe in continued education. I have my Heat pump certification already which allowed me to get the AC install and service certifications also. So I received four at the same time. I have been in the HVAC field for 10 years and finally decided to get my certifications. I can do these tests in my sleep. I just have OCD and I really like how your teaching style makes it quick and fast and not all the fluff. I won't be going after oil related heating but my next testing is for Boilers and then commercial chillers. I am trying to be well rounded. I found the 202 videos but they were kind of out of order, but maybe it is fixed now. Thank you for what you do for the HVAC community.

[@Balticblue93]

@@love2hvac It makes sense to have the name change. I just know you are pretty KZbin famous and you might know my teach Don Leonardi from the HVAC school here in Denver. I know Ed from ACCA also.

[@JosephJones-bg2un]

When compressor and the evaporator are working together what out of the two causes suction

[@usahoangsatruongsa]

Hey Ty, I have question for you ? With a system has been running fine for over 10 years and now has a problem with not cooling because it's low on refrigerant , will you do a leak search and charge your customer $190/ an hour or more to do a leak search ? To do a leak search is not easy especially when the unit is in a low clearance crawlspace, sometimes you need to remove the furnace flue pipe to get access to the cover of the evaporator coil and all the tapes, screws, pvc pipes and messy mastic ..etc..etc.. and you end up to find out that the Evaporator coil has a tiny leak but very difficult to get your torch in there to fix it. Even if you can, what kind of warranty you give your customer ? because you already know that the coil is already over 10 years old? What happen after 6 months after you fix it there's another leak ? YOU cannot do a leak search for free, that's a fact. I know some companies they charge their customer for a maximum 2 hour for leak search $190/hour so the cost will be $380 ! And worse they end up with multiple tiny leaks in the coil that can not be fixed or not economical feasible to fix it ? and the customer still has to pay for the leak search ? So your customer choices are either they have enough savings to get a new evaporator coil/ or new ac system or you technician helping them by just adding the refrigerant to help them to get through until the next hot season.?. Of course if it's a big leak then you won't put refrigerant in it because that's a waste. And YOU cannot do a leak search for free, that's a fact. I know some companies they charge their customer for a maximum 2 hour for leak search. It's easier said than done.

[@love2hvac]

Thanks for the reply. There is a lot to unpack here so this will be a long reply. Let's start with leaks. There are many types of leaks. I have done thousands basic leak searches for free. Again basic leak searches. Shutting the system off, I check the most common places first. I check around the valves, the bottom of the condensing coil, I put the probe in the armaflex to see about the line set. Inside, if it's an air handler It. Easy to get around the evaporator coil. If it's a furnace with a difficult to get to coil I work my probe in the side of the across door and also in the aux drain hole (careful to not get the tip wet). It takes about 5 minutes to do that but it gives me valuable information. Next let's evaluate that information Scenario #1 we find a leak in a braze connection. We give the customer options. We can do an indepth leak search to ensure there are no more, we give them a price to recover repair, drier, vacuum and recharge, and we give them a price to just add refregerant but we have to note that it is leaking and there will be no warranty as it could leak out in a few houers or months, we don't know when but it will leak out again. We let them know about the cost of adding and the potential environmental concerns (yes a lot of customers are big on this) and let them make the decision. They make the decision and there is a paper trail. Scenario #2 my meter goes off in the evaporator case. I know that's a good size leak. As you said the coil is already over 10 years old, there is no point in pinpointing the leak or repairing it. I give the customer the option to charge it but I also do the right thing to let them know it will leak out again. I let them know that fixing a leak in the evaporator coil is very risky and rarely works. I also get them set up with a comfort advisor to get a quote on a complete system or an evap coil. They can discuss payments and options with them. What ever they decide I have provided them with options. They make the dessition and there is a documented paper trail. They literally sigh separately that it is a temporary fix. Senario 3 we pick up a leak in the armaflex we let them know where a premiminary leak was found. We give them options, continue the leak search by isolation and confirmation, we just add refregerant with no warranty and we get a comfort advisor to quote a system with a new lineset. The customer makes the decision. Senario 4 leaking caps and shrader core. We let the customer know they are leaking and how much it will cost to replace the cores, caps and such. We offer them a leach search if they want to be sure there are no other leacks, we just add refregerant with no warranty and make it clear it is temporary. The customer decides. Senario 5 no leak was found. We inform the customer we provided a very basic complementary leak search. We did not immediately find anything but refregerant does not wear out it leaks out. We inform them that charging the system will provide temporary cooling but it is unknown how long it will last and there is no warranty. We give them the price for a level 2 leack search. Since the system is over 10 years old we get the comfort advisor out to give them a free quote. The customer makes the decision on what is best for them and their budget. Senario 6 we see it's low on charge, we just add refregerant and move on to the next call because the company and the tech can make more money that way, it's easier to do and the customer keeps calling you back for repeat buisness. The tech dosent have to sharpen his/her skills and dosent have to buy an expensive leak detector. We remove the decisions from the customer and decide what is going to be best for them without giving them options. We make excuses to make this sound good so we can sleep at night but deep down we know it's wrong.

[@Abdulrahman_Hi]

Would I be wrong to always relate TD with DeltaT, and make them proportional with each other? My thought process was the following: If the TD is higher, that means the evaporator has a lot less heat than the return air, which allows for greater heat transfer. That means as the air hits the coil, a lot of the heat will leave the air and go to the evaporator coil, which results in a greater DeltaT. That is apparently incorrect. For an immense heat transfer to take place, I need more of my evaporator to hold the refrigerant in its saturated form (latent heat). Yes, it is true that as a cause of a low pressure leaving the metering device, I have a lower saturated temperature. But that saturated refrigerant takes very little volume in the evaporator, which causes it to be fully saturated very fast and enter its SH phase very early. That's why it's not a good idea to make TD and DeltatT (directly or indirectly) proportional.

[@toyinorodare4072]

TY kindly help me out. How can I modulate the Compressor head pressure with the Electronic Expansion Valve? I want to design energy efficient Coldroom taking advantage of Low ambient temperature.

[@love2hvac]

The head pressure need to be kept up to feed the expansion valve. Head pressure control is done with a head master, dampers, fan cycle switch in low ambient ambient .

[@toyinorodare4072]

Thank you for the reply. Using R404A My project is to maintain low condensing temperature while taking advantages of low ambient temperature. I want to maintain a TD of 25°F across the Condenser @95°F ambient(peak) so that condensing P/T = 310psig/120°F However, when the ambient temperature fall to 80°F, TD 25°F but P/T = 270psig/110°F. so I want to learn how to control and modulate the Compressor head pressure and Condenser fan capacity as the Ambient Temperature changes.

[@bryanswanson5007]

@@toyinorodare4072 first thing i would recommend to you is to hire a professional to design and install whatever it is youre trying to build here. The information youre giving here doesnt make a whole lot of sense. The ambient temps youre stating here are not even close to low ambient temps. And as Ty stated, you dont control head pressure with a EEV , they control superheat only. If your system will be cooling in much lower ambient conditions you would need a head master control valve ,which is the best way to control head pressure in my opinion, or you could install a fan cycle switch but that isnt the best setup as it has disadvantages. You also need to think about what your conditioned space requirements are: temp, humidity, airflow considerations,ect before you can even decide on T.D.'s. As for controlling or modulating head pressure, as the ambient temperature falls, so will your head pressure and condensing temperature, you dont need anything to make that happen. You just need to make sure it stays high enough to satisfy the pressure differential required for the txv to operate as well as supply it with 100% liquid without any flashing. Thats where the head master comes into play. If youre wanting your condenser fan or fans to modulate based on head pressure , you would need vfd , pressure and temperature transducers,and expensive controls to make all that happen. This type of setup is generally part of a commercial building automation system and very expensive. You may be better off just getting a multi staged or variable speed system depending on what your conditioned space needs are. There are refrigeration units that will modulate evaporator fan speed and refrigerant flow through an EEV based on load conditions as well.

[@Michael-pz1hc]

TY the best! Any recommendation of a not too expensive leak detector :). Thank you!

[@love2hvac]

I like the fieldpiece infested, I will have to look up the model.

[@Michael-pz1hc]

@@love2hvac Thank you!

[@timothydevries383]

Modern r410a evaporators have a trend of quality problems and leaks. It's incredibly bad for global warming. The EPA should enforce manufacturing quality standards and leak detection on installed systems.

[@garza7676]

In most places Air conditioning is a seasonal job.Should a Tech spend hours searching for a leak that would probably lead to not making any money ? The issue lays in Air conditioning companies who offer profit sharing incentives this makes technicians play this game of run and gun approach . If they can't fix the issues in less than a few hours its fill it up and move on to the next call .

[@love2hvac]

The profit sharing companies don't find leaks either, they just sell new units. They also say you have out of date equipment you have to buy a new unit. Those corporations don't want them to fix only to sell. Them on top of that they don't install the unit properly, they just slap it in.

[@garza7676]

@@love2hvac Welcome to corporate America and capitalism .This practice goes beyond just the Air conditioning industry. I’m in the Aero space industry and see it all the time .

[@jyphc1679]

What happen if you install filter drier backwards ?

[@love2hvac]

Great question, first part of this video explains it kzbin.info/www/bejne/qJWyd6hop7l1b68

[@caru3257]

A month ago I helped on an install where the dryer was one way filter dryer for a heat pump. I have no idea as to how the system worked.

[@love2hvac]

A one way on a heat pump will filter just fine in one mode but when it reversed, everything it captured gets pushed right back into the system.

[@shine-cg9uf]

🍎🍎

[@jasonjang9642]

Question: when power off, unit w TXV will pressure equalize? If not , is it mean TXV restriction? Thanks Jason

[@love2hvac]

Some TXV do equalizer with pressure while others are hard shut off that prevent it .

[@Qualityservicesbcs]

Unicorn juice haha

[@metsrus]

Hi Ty. I believe I have a refrigerant leak in my 20 year old system. Do you recommend finding and repairing the leak or just getting a new system?

[@love2hvac]

Tough call. It really depends on where and how bad the leak is. If it's a slow leak, you might try some leak stop. I'm typically not a fan of the product but to get a few more years of life it's a good option.if it's on a braze joint, fitting or pressure switch definitely fix it. If it's in the coil then you have a lot more to consider. New systems are having a lot of leaks it seems. New systems have different airflow requirements than the old so just swapping out like before is not the answer. Look at having a blower door done and sealing the home. Then have a manual J done to find the right size unit. Most are oversized, causing higher humidity and more uncomfortable. Then have a manual S to find the right system for the needs. For example not all 3 tons work the same or have the same capacity. Then have a manual D to see if ducts are going to be the right size. Next thing to consider, new refrigerant. 410A has been labeled as global warming and will be a phase down. It's won't be phased out completely but they will drop production. The problem is the new refrigerants have not been approved as they are A2L mildly flammable. They have to change the codes to allow. It should be available by 2023 Sorry it's not an easy answer right now between changes, regulations and energy efficiency's

[@Paul-mf5ve]

NO LEAK TEST IS ALWAYS GOOD FOR BUSINESS BECAUSE THE TECHNICIAN CAN ALWAYS MAKE SERVICE CALLS!!!!!!!!!!

[@love2hvac]

So you don't think you should give the customer the option for thir home and thier equipment?

[@Android_Warrior]

Great video except that stupid blue indoctrination bar.

[@realestateservicessaleshea99]

Much easier to gas-n-go then to check for leaks,plus customers are conditioned to get a "shot" "fill" "topped off" get me thru" ect... I have found a lot of leaks on Schrader valves, I don't see any tubers checking Schraders for leaks? Air flow Air flow Air flow !😆 🍺🍺🍺🥃🥃🍿🏌🏻‍♀️ Stay safe. Retired (werk'n)keyboard super tech. Wear your safety glasses !

[@thisisyourcaptainspeaking2259]

In my (limited/humble) experience, most leaks are schrader and the god-awful schrader cap seals. Can't tell you how many times I've found replacing the schrader only slows the leak but doesn't stop it completely.