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How much r12 to add? 200 1987

posted by  Rule 308 on  Thu Jun 9 13:26 CST 2005
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last visit: Tue May 8 09:20 CST 2012
[RELATED]

Well unless you do a complete evacuate and recharge which is 2.9 pounds on a 240 you are just making an educated guess at how much to add. Seeing as the system holds damn near 3 lbs you would probably be safe adding 8 ounces or 1/2 a pound and checking. You need to have guages so you can monitor the pressures both high and low, monitor the outlet duct temperatures both before you've added gas and after, and pay attention to how much the compressor cycles. What method do you have of weighing the amount of refrigerant and what kind of guages do you have to dispense the stuff and monitor pressures? Are you just using cans? If so then suck in half a can and see if it likes it. Most R-12 you find these days is in a 30Lb jug but the ocassional can will surface here and there. A three ounce oil charge would not hurt things and in all actuality will probably help.

Mark






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