Trane Air Handler Fan Constantly Running

no requirements to keep records for small systems.

you would charge it by measuring the outdoor ambient, indoor return wet bulb, then the superheat or the subcooling of the refrigerant depending on if it is a txv or orifice system. it really isn't as hard as the fearmongers are making it sound.

there is usually a spec by weight in the manual for given condenser and indoor coil combinations with some range of lineset length and the amount to add for additional lineset.

Copper Thieves Beware, There Is Justice When Stealing HVAC | Coldcraft Inc.

In the article that @pecmsg posted, the copper thieves were stealing condensors on a regular basis, so the cops had under cover personnel looking for the thieves. When the officer saw the copper line get cut, that is when he knew that the federal clean air act violation was in play. The cops called the Feds. The Feds have stronger penalties than the local PD has when it comes to just steeling an appliance. Good Call for the cops on this one!

It is probably less of an issue with a leak than when charging from a tank. as the refrigerant evaporates rapidly from the tank as it is charged in to the system you would have one refrigerant evaporate more than the other which is why you invert the tank and allow the liquid mixture to leave the tank and charge it slowly enough that it can evaporate before it enters the system. When it evaporates very slowly as the system leaks slowly the evaporation is likely to be more even although it could still lose more of the refrigerant with the higher vapor pressure.

Assuming it has service valves and I think the first picture showed them, you would probably just close the discharge service valves and pump the charge down in to the condenser, assuming the leak was elsewhere.

There may be so little refrigerant left in the system now that it won't matter much if the mixture is off because it is only say 20% of the charge has a ratio that is off by 30% and it will only be off a very little once you add the missing refrigerant.

Yes as @pecmsg said blends have to be charged as a liquid.

Steve Lav on U tube is installing Goodman because they are R-32. He went to install a Rheem and his supply house told him a 20lb can of R454B was 2k

R-32 looks better at the moment but both these refrigerants ……it's just too soon to know what is better. But Daiken/Goodman is a global company and like you pointed out its been in use overseas for years.

Sub cooling has historically been the way to go with a TXV. You need liquid at the TXV for it to work and feed the coil properly. With no subcooling you may not have liquid at the TXV. With sub cooling you will. The question is how much subcooling do you need. In the old days 15-20 deg was common. Now many systems are 10-12 degrees. Same with superheat they used to say 20 now usually lower.

I usually try to charge it the way the MFG wants but once in a while you get a unit that just will not "line up" on the chart. Then you have to look at superheat, subcooling, compressor amps and clean the coils and come up with a compromise that works.

its not always one size fits all.

though the guy that installed my ac 25 years ago before i understood this used the pressure /indoor/outdoor chart to charge it i thought that chart was just a quick check and measuring subcooling was the proper way. the more subcooling you have the more work the compressor is doing so you want it as low as it can go without going to 0 at some condition so ideally you'd set it based on a curve that accounts for the current operating point the same way you set superheat on an orifice system.

unless it is certain types self contained appliances there is a range of charge where it will function and perform about the same.