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1. Connect a manifold gauge set. 2. Set the A/C Heater mode control switch knob (2) in the Panel position, the temperature control knob (7) 3. Start the engine and hold the idle at 1,300 rpm with the compressor clutch engaged. 4. The engine should be at operating temperature. The doors and windows must be open. 5. Insert a thermometer in the driver side center A/C (panel) outlet. Operate the engine for five minutes. 6. The compressor clutch may cycle, depending upon the ambient temperature and humidity. 7. With the compressor clutch engaged, record the discharge air temperature and the compressor dis- 8. Compare the discharge air temperature to the Performance Temperature and Pressure chart. Performance Temperature and Pressure Ambient Air Temperature and Humidity 21° C (70° F @ 80% humidity) 27° C (80° F @ 80% humidity) 32° C (90° F @ 80% humidity) 38° C (100° F @ 50% humidity) 43° C (110° F @ 20% humidity) Air Temperature at Center Panel Outlet 10 to 13° C (50 to 55° F) 14 to 17° C (58 to 63° F) 15 to 18° C (60 to 65° F) 17 to 20° C (63 to 68° F) 14 to 17° C (58 to 63° F) Evaporator Inlet Pressure at Charge Port 241 to 276 kPa (35 to 40 psi) 262 to 290 kPa (38 to 42 psi) 269 to 296 kPa (39 to 43 psi) 275 to 303 kPa (40 to 44 psi) 262 to 290 kPa (38 to 42 psi) Compressor Discharge Pressure 1241 to 1792 kPa (180 to 260 psi) 1380 to 1930 kPa (200 to 280 psi) 1380 to 1930 kPa (200 to 280 psi) 1655 to 2206 kPa (240 to 320 psi) 1567 to 2068 kPa (220 to 300 psi) Note: The discharge air temperatures will be lower if the humidity is less than the percentages shown. ZH HEATING & AIR CONDITIONING - SERVICE INFORMATION 24 - 71 |