OPERATION & MAINTENANCE MANUAL TC670E - RTI Technologies

RTI Technologies, Inc.OIL DRAIN & AIR PURGEOil and Non-condensable Gas (Air) are separated fromthe recovered refrigerant and MUST be removedfollowing EACH recycling procedure as follows:1. MOMENTARILY press the Purge Button (To theright of the Purge Chart) and hold until the pressurereading on the Pressure Gauge above this buttondrops one small graduation mark (approximately 10PSIG).2. SLOWLY open the Oil Drain Valve (Lower leftside on back of TC670E) to vent Non-condensableGas and drain any oil which may have beenremoved from the A/C System. A plastic cup isprovided to collect the oil.Unless the A/C System had previously beenoverfilled, the TC670E will typically not removemore than a tablespoon of oil, making replenishmentunnecessary.Leave the Oil Drain Valve open.3. Determine the room temperature.4. Locate the pressure (PSIG) corresponding to thisroom temperature ( 0 F) in the chart on the top of theTC670E. This chart is reproduced at the right.If the pressure indicated on the gauge is greater thanthat determined from the chart...SLOWLY press and hold the Purge Button untilthe gauge pressure equals that shown in the chart.Any Non-condensable Gas will be ventedthrough the Oil Drain Valve.5. Close the Oil Drain Valve.6. Press the Purge Button and hold for approximately5 seconds. This permits any residual NoncondensableGas to be recirculated for reprocessingduring the next recycle procedure.0 F R12 R134a30 42 4032 44 4234 46 4436 48 4638 50 4940 52 5142 54 5444 57 5646 59 5948 61 6150 64 6452 66 6754 69 7056 72 7258 74 7660 77 7862 80 8264 83 8566 85 8868 88 9270 92 9572 95 9774 98 10476 102 10778 105 11080 108 11482 112 11884 115 12386 118 12788 123 13090 127 13592 130 14094 135 14596 138 14898 143 153100 147 157102 150 163104 155 167106 160 173108 165 180110 168 185112 173 190114 178 195116 183 200118 188 207Purge ChartSeptember 19, 1997 Page 9