Rheem RARL-JEC Installation Instructions - Page 46

TABLE 8 TEMPERATURE PRESSURE CHART TEMP (Deg. F) R-410A PSIG -150 - -140 - -130 - -120 - -110 - -100 - -90 - -80 - -70 - -60 0.4 -50 5.1 -40 10.9 -35 14.2 -30 17.9 -25 22.0 -20 26.4 -15 31.3 -10 36.5 -5 42.2 0 48.4 5 55.1 10 62.4 15 70.2 20 78.5 25 87.5 30 97.2 35 107.5 40 118.5 45 130.2 50 142.7 55 156.0 60 170.1 65 185.1 70 201.0 75 217.8 80 235.6 85 254.5 90 274.3 95 295.3 100 317.4 105 340.6 110 365.1 115 390.9 120 418.0 125 446.5 130 476.5 135 508.0 140 541.2 145 576.0 150 612.8 46 17.7 Subcooling Calculation 1. Measure the liquid pressure at the liquid line service valve. 2. Convert the liquid line pressure to saturated temperature. See Table 8. 3. Measure the liquid line temperature at the liquid line service valve. 4. Compare the liquid line temperature to the saturated temperature. 5. The difference between saturated temperature and liquid line temperature is the subcooling. Subcooling normal range 9° to 12°. TABLE 9 AIR CONDITIONING SYSTEM TROUBLESHOOTING TIPS AIR CONDITIONING SYSTEM TROUBLESHOOTING TIPS SYSTEM PROBLEM Overcharge INDICATORS DISCHARGE PRESSURE SUCTION PRESSURE SUPERHEAT SUBCOOLING COMPRESSOR AMPS High High Low High High Undercharge Low Low High Low Low Liquid Restriction (Drier) Low Low High High Low Low Evaporator Airflow Low Low Low Low Low Dirty Heat Pump High High Low Low High Low Outside Ambient Temperature Low Low High High Low Inefficient Compressor Low High High High Low TXV Feeler Bulb Charge Lost Low Low High High Low Poorly Insulated Sensing Bulb High High Low Low High