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Forward Look Technical Discussions -> Heating, Cooling and Air Conditioning | Message format |
59 in Calif![]() |
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Elite Veteran Posts: 1014 ![]() Location: Hayward, Calif | Hey Guys, Getting ready to start on the AC sys. I have a rotorary comp from Bouchillon. the piston type was too tall and couldnt close the hood. the condensor came from the Dodge motor home that I took the eng out and put in wife 59 Dodge. Summit Racing has a nice looking under dash unit from Vintage Air. ? is how do I know how much freon R134 to put in it ? Thanks, Jerry | ||
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57chizler![]() |
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Expert Posts: 2865 ![]() ![]() ![]() ![]() ![]() ![]() ![]() Location: NorCal | Most Vintage Air units require 1.8 lbs. of R-134 | ||
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59 in Calif![]() |
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Elite Veteran Posts: 1014 ![]() Location: Hayward, Calif | I'm guessing the condensor size would affect the sys capacity. Are most automotive condensors about the same size ? this one completely covers the rad. Do I still need to add that can of oil with a rotary compressor ? Thanks, Jerry | ||
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57chizler![]() |
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Expert Posts: 2865 ![]() ![]() ![]() ![]() ![]() ![]() ![]() Location: NorCal | Condensor size has little bearing on system capacity. A new Sanden compressor is charged with all the oil the system will need. | ||
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Chrispy![]() |
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Extreme Veteran Posts: 518 ![]() Location: Colorado Springs, Colorado | You'll want to get familiar with a Pressure and temp chart to get your system properly charged. Pull a vac on the system, let it sit for 30min with the pump pulling, then let it sit for 30 more to make sure it doesn't have a gross leak. Then start putting in 134 with your manifold, you'll want to know the ambient temp. Then using the P/T chart, fill the system until you hit the values you are looking for. At this point you should be good to go. Please note that 134A runs at a higher system pressure than what r12 did, so the pressures listed in the shop manual will be completely worthless to you after conversion. Edited by Chrispy 2017-04-05 3:54 PM (Temp-pressure-chart-33776F1.jpg) Attachments ---------------- ![]() | ||
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57chizler![]() |
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Expert Posts: 2865 ![]() ![]() ![]() ![]() ![]() ![]() ![]() Location: NorCal | The only correct way to charge an empty A/C system is by weight. | ||
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Chrispy![]() |
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Extreme Veteran Posts: 518 ![]() Location: Colorado Springs, Colorado | 57chizler - 2017-04-06 11:19 AM The only correct way to charge an empty A/C system is by weight. You are right, I've just been forced to wing it on r12 conversions for a while so I use the chart to get close. How much weight would I use for a factory a/c system from 58 running a sanden and 134? Edited by Chrispy 2017-05-03 12:33 AM | ||
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