Hey thank you for explaining things so thoroughly because this is what I do all day and nobody explains nothing thank you

@builderman912

Жыл бұрын

mostly they dont because they dont unserstand it themselves, i have 40 year exp tech that cant explain this :(

@dioncurtiscurtis3188

21 күн бұрын

@@builderman912which is sooo sad. But I get it

Thanks from Bangladesh.

Very helpful... please do a video on oil logged evaporators ../. condensers

@edlauren9434

9 ай бұрын

This would be a great topic!

I couldn't have explained it more clearly, thanks Ty!

I have an air restriction problem today, thanks Mr. Ty.

Love the dedication Ty!

Love the engineering behind it. Would love it even more if you could show a situation in lab or field with manifold on . Because dirty condenser also will give high head pressure. Thanks.

Dude this is Gold

thank you ❤️❤️❤️❤️

AN OIL LOGGED EVAP IS ANOTHER GIOD ONE THAT MOST PEOPLE HAVE A HARD TIME DIAGNOSING

Thanks ty....

hi ty why delta T of condenser it will stay the same inspite of head pressure up then saturation temp it will up .... Or do you mean temp of refrigerant it will not change even though the head pressure change .

Good video. When will we get to the electrical section?

@love2hvac

2 жыл бұрын

I'm working on the details, still have to finish up fundamentals

Hey can you explain how a DHU works?!...thanks for everything you do god bless you!

@love2hvac

2 жыл бұрын

I yes I will be covering psychometrics before long and it will be covered in detail.

What would be the difference in subcool and superheat in a dirty evap coil vs a over charged?

@love2hvac

2 жыл бұрын

Great question. In these examples they are all with proper airflow first. This simplifies the foundations and places the importance of airflow first. I believe proper airflow should be established prior to superheat and subcooling. I believe in air conditioning the airflow is essential and an essential part of diagnostics. I will later be doing classes on airflow and multiple ways of checking and verifying it. I will also be doing classes on diagnosing. In that section I will show all the symptoms for each problem such as a dirty evaporator coil and how that effects the entire system It will tie together capacity SH SC compressor capacity static pressure and more.

@edwardgarza5104

2 жыл бұрын

@@love2hvac thanks for the response, your videos are awesome 👍

90+ condensing furnaces plug at the secondary heat exchanger as well.

it's actually very hard to tell the difference between a TXV problem (dirty/debris and can't work correctly) and a low indoor temp, as well as air flow restriction based on SH / SC and pressures. When we have a low indoor temperature, the pressure drops, the temperature on the evaporator drops even below 30F. Then what? Should the TXV be opened only minimally so that as little refrigerant enters the evaporator? I have this situation at mine car, i in Car A/C, system with TXV and fixed piston compressor, when i RISE RPM, my Superheat instantly drop down to 0, 1, 2...thats low. yes, there is a low ambient temperature( 67F), and a low cabin temperature(61f), how do I know if the TXV is working properly? maybe some debris fell under the needle and it could not move needle down to block refrigerant flow? any advice to be sure if i have to replace TXV or too low ambient/indoor temp?

@love2hvac

Жыл бұрын

Get the true flow grid and confirm airflow before doing superheat or subcooling. TXV rarely fails and often misdiagnosed. Bad airflow is the #1 cause for improperly diagnosed TXV. A TXV does not control pressure, it controls Superheat assuming airflow is correct first. If you have low suction pressure, adjusting the TXV will only flood the compressor and cause premature compressor failure.

What’s the good condenser Δt ?

@love2hvac

2 жыл бұрын

There is no set number. It will vary with conditions, and how much airflow the manufacture has designed. Later we will look at how to calculate total BTU with condenser deltaT and CFM.

Wouldn't the evaporator Delta T go down? Since not much heat is being transferred the entering and leaving temperature should be close to each other. Maybe I'm thinking this wrong. I'm appreciative of the content you provide.

@love2hvac

2 жыл бұрын

The same quantity of refregerants is flowing into the evaporator coil so the BTU or heat absorbing capacity is still there. Now that the air is moving slower it has more time to change the temperature of the air. The slower air also has more contact time giving it more time to change the temperature. Since the airflow is less there is overall less heat on the evaporator so the temperature and pressure of the evaporator coil will drop. The lower coil temperature will also mean it is much farther below the due point temperature and dehumidify better. However it won't have enough time to boil all the refregerants to a vapor, dropping superheat and potentially damaging the compressor. Lower airflow = More contact time lower evap temps, shame capacity= larger TD. On a gas furnace more airflow is also a lower TD and less airflow is a greater TD. The furnace makes the same BTU what changes the temp is the airow.

@love2hvac

2 жыл бұрын

Here is a video that explains it better kzread.info/dash/bejne/ooSGrNN9n7mpiMY.html

@love2hvac

2 жыл бұрын

Here is a great article that works together with it hvacrschool.com/an-evaporator-coil-with-no-fins/?fbclid=IwAR2zcS0LxdknvcdLM3ukmlmVPzSOgAKxbH4As4KNk1D3uSxsYI42-oVajew

@love2hvac

2 жыл бұрын

And more. More that is all connected hvacrschool.com/20-%CE%B4t-delta-t-a-lazy-rule-of-thumb/

@bradmironik6137

2 жыл бұрын

Thank you for responding.

I'm confused on this one. If the airflow is low, wouldn't it make the TXV to overfeed migrating the liquid out of the condenser into the evaporator? During a TXV overfeed, the suction pressure raises but with low airflow it decreases? Am I reading too much into it?

@love2hvac

2 ай бұрын

The TXV will try to maintain a constant superheat and maintain the correct amount of refrigerant in the coil. Once the air is restriction gets severe the TXV will close to the maximum of its movement and the evaporator will then flood

@kamilmuza4417

2 ай бұрын

@@love2hvac Ty, first of all thank you for responding so quickly, I'm a fan of your channel, its in my opinion the best in the industry when it comes to teaching!. That's what I had in the back of my mind. It most be a severity situation. I guess a mild airflow restriction will show signs of TXV overfeeding but only when it starts to get bad is when the suction pressure will begin to drop and liquid starts to go through the evaporator and back into the condenser!.

How the suction pressure of the refrigerant decreases

@love2hvac

Жыл бұрын

less airflow means less heat on the evaporator. Less heat means the saturated or boiling temperature drops and the suction pressure is tied to the saturated so it follows. More airflow means more heat, faster boiling, higher suction pressure and higher saturated temperature.

Nice teach sir..What cause, if my discharge pressure stay and my suction pressure drop.. Hope u can reply..

@love2hvac

Жыл бұрын

Pressures domt mean much It's about superheat subcooling, airflow and your metering device. Give me those numbers

@saudarwanachannel8558

Жыл бұрын

@@love2hvac my superheat : 13.5 f, subcool: 47,3 f.. Air : 80,6 f.. And metering is danfoss tex20.. (Double) Airflow in good condition.. Renewed air filter, drier filter.. Problem ( freezing at coil, and low press. Line and compressor after run about 3-4 hours).. My compressor carrier 5h60 .. Condenser cooling media is sea water (30°c) Im in indonesia by the way sir.. Hope u can help me sir..🙏

@love2hvac

Жыл бұрын

Excellent information, Thank you! The numbers tell me you are having an indoor airflow problem this could be lack of air across the coil or a dirty coil. The 13.5F superheat tells me the TXV is working correctly The 47 subcooling tells me someone tried adding refrigerant to solve the airflow problem. Alternatively, check the water regulating valve at the condensing coil. If it's letting too much water through it would cause a stable head and a low suction.

@saudarwanachannel8558

Жыл бұрын

@@love2hvac thank you very much.. ..for ur time and advice God bless u sir. ... 🙏

Air flow Air flow Air flow Accumulators & receivers compensate for load fluctuations? So there will be times when flooding is normal?🤔 🍺🍺🍺🥃🥃🍿🏌🏻‍♀️ Stay safe. Retired (werk'n)keyboard super tech. Wear your safety glasses!

@love2hvac

2 жыл бұрын

I was debating adding that or not. Since most resi units don't have accumulators or recovers I decided to keep it simple.

@realestateservicessaleshea99

2 жыл бұрын

@@love2hvac when I think refrigeration I don't think comfort cooling.

Why not also talk about too much airflow across evaporator coil ?