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Slow charging

chvet73 on Sat May 23, 2009 10:39 PM User is offline

Year: 1973
Make: Chevrolet
Model: Corvette
Engine Size: 350
Refrigerant Type: 134
Ambient Temp: 80
Pressure Low: 32
Pressure High: 190
Country of Origin: United States

My system has an accumulator setup from an 82 Vette, Sanden 508 which was an R12 model and a crossflow condensor, it's running R134. I posted before about how I had it running well but it leaked. Found a leak in one of the hard lines I brazed up. Fixed that, and also discovered the oriffice tube was in reversed.
Put it back together and pulled a vacuum twice allowed it to set in between with no problem. Charged it up and that's where the question comes in. The first can went in quickly. After that it took nearly 2 hours to get up near to 200 on the high side. I don't know, but that seems very long to me. Got down to 40 degrees so I feel my mission was accomplished but wonder why it took so long. I'm suspect of the compressor. No weird noises from the compressor. What do you guys think?

Dougflas on Sat May 23, 2009 10:47 PM User is offline

Don't know why it took 2 hours. I take it that you made it a cycling clutch type. When the charge is low, the office tube area will show frost. You could have heated the R134 in hot water to quicken the charge process, put a momentary switch in place of the low pressure cycling switch. When you see frost, you would open the switch. I have never taken more than a few minutes to introduce freon into a system even at your ambient temp.

chvet73 on Sat May 23, 2009 11:30 PM User is offline

Did not see any frost near the tube. Had the cycling switch jummped until I got up to decent pressure. Next time I will warm the can of freon.

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