Charging AC ?

I was charging my tractor AC and turned the cab upside down. A fellow watching said that was dangerous as it was filling it with liquid. I had done this before and had no trouble. The pressure did not read excessively high. Thanks

Not sure of what you are saying.What do you mean by saying that you turned the cab upside down.need a little more info.

The compressor isn't made to compress liquid while running it can mess it up or ruin reed valves inside. Same thing when a can is charged too fast over 40 psi some liquid will go in. Suppose to put it in as a gas on the low suction side. You can warm the can with wet shop rags or in a bucket of warm water but don't pressure it over 40 - 45 while charging or will go in as liquid instead of gas even though it's held upright. Some systems use to recommend or allow liquid being charged into the high side of system only while the compressor was off. Then charge the rest in suction low side as gas while it was running.
AC repair questions & answers

Realize you meant to say CAN

Realize you meant to say CAN

Sorry I did mean CAN

When charging with a can it is best not to turn it upside down for long but due to the heat of the engine and if you have a reciever between the vacuum port, nothing will happen. Especially with 134a because it expands very rapidly . Henry

The cans say to shake the can and rotate between 12 and 3 oclock every 5 seconds or so. At 3 oclock liquid is going in.

I blew the reed valves out of a York compressor by foolishly slugging it with liquid refrigerant.
Since that expensive lesson, I place the cans upright in a 5 qt plastic bucket of warm water.

The refrigerant boils off quickly in the warm water and no danger of tearing up the compressor by feeding it liquid.

Hey someone read the instructions.

One way to speed up charging an EMPTY system---we assume you have the system evacuated down--is to dump some liquid into the HIGH side before you start the system. The way you do this is as follows:

The service valves have "three" positions.

Normal "stem out" closes the test port, and opens the valve to feed the compressor head to the hot gas tube

"in the middle" leaves above operation intact, and opens the test port.

"Stem down" would be if you are swapping a compressor--closes off the head from the line so you can yank the compressor.

So you have the service valve "in the middle"--test port open, you have your manifold hooked up, and you are done evacuating and testing, the system is MT and under a vacuum.

You simply close the manifold, hookup and purge the refrigerant can, and turn it upside down, (purge the middle hose at gauge set)

Now you can just open the high side valve on the manifold set and dump liquid in the high end. It won't go back into the compressor, but will fill the condenser/ receiver and start to pressure through the TXV to the low side, and you will see the low side gauge start to rise.

This becomes a matter of practice, unless you are measuring a charge, with scales or whatever.

Turn the can upright to purge the liquid, and close the high side manifold valve

Fire the system and adjust the final charge. I ALWAYS check the suction line superheat for some idea as to condition in the line. Be sure to insulate your thermometer/ thermocouple well