Posted by 440roadrunner on June 04, 2009 at 18:03:23 from (98.145.76.31):
In Reply to: Charging AC ? posted by dr sportster on June 04, 2009 at 15:15:33:
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
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