Thank you. I appreciate the sport!

Thank you

Awww thank you

I'm the world of business nothing is mixed, just sell sell sell. There are sales techs that have never replaced a contactor or capacitor. I know somewhere out there, there are going to be techs that want to diagnose and fix, and customers willing to pay for it.

Thanks! Mixed refrigerants makes all diagnostics difficult because we never know what the SH or SC is since we don't know what the saturation point is. Mixing refrigerants changes the PT points of all the refrigerants.

SubCooling is a very nice thing to measure, but pretty much useless fir refrigeration applications… at least from my experience. However, TD in the condenser coil is kind of more reliable thing… However, if it’s an inverter/variable speed compressor it becomes useless as well… SuperHeat rules! :),

Delta T is same media in and out. Example air in, air out. TD is two Different. Example air in vs refrigerant. A lot more detail here are the 2 videos that go into detail. Delta T kzfaq.info/get/bejne/praCfdR11LyniJc.html TD kzfaq.info/get/bejne/jOCCpMJkm-DVk5s.html

22 is relatively odorless but in higher concentrations it has a chemical almost sweet smell but I dont recommend sniffing it by any means. If the compressor was burning up internally it would not last but a few hours so that's unlikely. It could also be contaminants on the coil, UV ligts or so called "air cleaners/scrubbers" that make a unique smell. Possible other electrical connections such as a relay going bad would be something to check.

Hey! are u sure thats true ?? "Turn off unit n watch head pressure. It should steadily drop. If head pressure stays for a bit then Slowly drops could b noncondensables." if this is true, it can be huge help in diagnosis....and question to the part 2 " taking temp of line going into condenser, leaving condenser n ambient with the unit off. " how long after turning off the device do you measure these 3 points?

@@hbo7799 yes its a good way to check for noncondensables. Read Dick wirz book commercial refrigeration for AC techs n go to chapter 7 troubleshooting.

@@hbo7799 when line in n out r same as ambient then concert condensing psi to saturation temp. If not the same as other temp could b noncondensables

Yes it will.

@@love2hvac thank for you feedback

Biggest killer for compressors is overheat form compression ratio. Biggest cause for high compression ratio is the low side pressure is to low. This leads me to believe your restriction is what killing the compressor. Restriction is typically in capillary metering devices, it the screen before or at the a fixed or TXV device, and the distribution tubes. This is primarily from oxidation for not brazing with a nitrogen flow, not protecting the lines when they are open, soft solder or flux inside the connections and piping. Restrictions inside the evaporator coil themselves, damaged tubing, attempted leak repair in the coil is most common. If it is a Heat Pump there will be many more causes. The evaporator might be too small for the compressor. Missmatched system. Also could be a restriction on the high side, such as 2 filter driers, or a cloged filter drier, or airflow on the condensor is recirculated. Part 2 refregerants In compatible refregerants or fractured refregerant blends. It may not work with the system or it may not work with the oil in the system. Mixed refregerants Part 3 broken scrolls is usually from liquid flood back or Liquid slugging. Liquid refregerant entering the scroll set. 1 liquid slugging, the evaporator is not boiling all the refregerant into a vapor, liquid slugs the compressor because A. Over charged B. Bad airflow/dirty coil filter ext ext C. Improper metering for metering device. 2 Flooded start, refregerant entering the scroll set at startup. A overcharged B needs a crank case heater That should lead you to the problem.

My favorite at 21:30 second favorite at 16:32 both in this video kzfaq.info/get/bejne/n7CEgLWQz7LHmpc.html This style you would have to use tubing cutters, I sweat or replace the fitting with the screen pressed I to it. Jump to 1:34 of this video kzfaq.info/get/bejne/oqd5iZOB2LSanpc.html

I am a long ways form covering screw compressors.

8:25 in reference to non condesables and the condenser. The condensor TD (refregerants vs Air in) will go up. The non condesables has contamination making a higher head pressure. The difference between the refregerants boiling and the air temperature will be farther apart (higher TD) because we are not getting a true saturated temperature. The Delta T (air in vs air out) will go down because we are moving less BTU of heat energy. The higer head pressure means less overall volume or refregerants pumped and less refregerants changing state meaning less heat rejected. Rejecting less heat into the air means the air will change less. This is why condensor Delta T drops. I hope that helps.

Yea sir! Hopefully before long

The tank temperature and pressure should match the chart. Get the refregerant in the tank. Get the temperature of the tank. Get the pressure of the tank. On the TP chart find the refregerant Then mach the temperature the tank was to the temperature in the chart. That will give you a pressure, the pressure of the chart should be the same as the pressure in the tank on your guages.

A kink is a significant issue. If a company missed something as significant as a kink, there are likely other things they missed.

Sometimes but not always since it usually collects at the top of the condensor.

I have some videos on the EPA preparation. Also Bryan Orr with HVAC school has the entire EPA 608 power points presentation on their channel.

Yes! I have a whole series planed for TXV diagnostics!

@R P my videos on TXV under the play list learn HVACR HVAC 060 introduction to the TXV TEV HVAC 061 TXV TEV part 2 with target subcooling HVAC 062 TXV/TEV target superheat HVAC 063 TXV/TEV with superheat and subcooling. HVAC 091 EXV EEV electronic expansion valve.

Only if the indoor temperature where the evaporator coil is and the outdoor is the same temperature.

@@love2hvac Given that it is very unlikely, it's a big no hahah. Thanks a lot.

Shutting off meaning they trip the breaker and you have to reset or you shut the breaker off each night?

@@love2hvac Mr. Ty Excuse my language, I meant the compressor tripped during the freeze of vapor line.

You have a problem. What is the suction superheat?

@@love2hvac suction superheat(13.3 f), and subcooling is 8 f at 88f ambient temperature.

Unfortunately companies are only paying sales techs good pay. We need to be rewarding skilled and knowledgeable tradespeople. Anybody can sell something, skills and knowledge actually fix and install correctly.

Bryan is right, but by the time we are seeing a restriction we have generally added refrigerant. Let me expaine some of the differences. #1 The receiver makes a huge difference because the liquid has someplace to go without affecting the head pressure. It will almost always follow the rule Bryan was talking about until you get to the point the receiver is overfilled or flooded. Which unfortunately, I have seen too many times, then the head pressure will rise after that. #2 Without a receiver, it will depend on the coil size. If you notice over the years higher efficiency units have larger evaporator coils. If it's tube and fin, it will have more volume inside and will blow it to work similar to a receiver. However some of these coils are larger but use smaller tubing and smaller internal volume. Especially when you consider a micro channel coil with very little volume. It will not have the space. For the refrigerant to stack and the pressure will rise quickly. Older condensors in the 70's and 80's often had small condensors and a restriction was quickly identified. #3 the metering device. 3A: fixed If we are looking at a fixed Metering device, or Cap tube, we are charging to superheat. If we have a restriction, we don't even see how much refrigerant is being added above the correct level. By the time we get enough refrigerant in the systems, it will have filled the high side with liquid forcing the pressure to go up. So initially it just looked low on charge and after adding refrigerant we can then see the restriction. Note like Bryan was saying the restriction was already there but now the overcharged had it shown up. It's the high side pressure that forces the refrigerant into the low side. So by the time we get enough high side pressure to change the blow side, it's now too high. 3B: TXV With TXV restrictions, the TXV will try to open more and more to allow more refrigerant into the coil. So depending on how bad the restriction is the TXV tries to compensate and the restriction becomes the metering device. There will be a turning point where the restriction becomes too large. We will see the high superheat, add refrigerant until we realize we added too much or until the high side becomes flooded and starts to rise. Finally In your example of a freezer with a blocked cap tube, it will have a lower volume condensor and a cap tube cannot open at all so 2x restrictions. So the condensor side will flood and force the head pressure up typically without adding any refrigerant. The higher compression ratio will likely provide enough heat to keep the high side high. In the spring I will see if I can make some videos showing this

I agree with everything you say, since it agrees with my experience, and also other's. But in your video (3:20 min) you say that head pressure is going up without any of the reservations you mentioned in your reply. If liquid storage size is such a major factor, I think that both your and Bryan should have mentioned it. In my case, a small freezer, with the proper amount of refrigerant(after vacuuming and filling to the manufacturer specs.), with a cap tube blocked, climbed up to above 600 psi before I turned it off. Needless to say that suction side went below zero. Many people I saw on the internet have experienced the same pressure rise when the cap tube is blocked. On the other hand, with my 25TR chillers with a large receiver, I'm used to pump down(shutting the liquid valve) without any increase in head pressure.

@@kamozoren This video is part of a series that represents the first module of a course. Much more details will be covered in my advanced course and diagnostics course. It just takes time and money to make it happen.

Thank you taking the time to answer in such a detailed manner. It shows your deep passion for the trade. I can't thank you enough for your educational videos.