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air conditioning system on humid days. A perfor- Before proceeding, (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - WARNING) and (Refer to 24 - HEATING & AIR CONDITIONING/ (1) Connect a tachometer and a manifold gauge set. (2) Set the a/c heater control to the recirculation mode (Max-A/C) position, the temperature control (3) Start the engine and hold the idle at 1,000 rpm with the compressor clutch engaged. If the compres- (4) The engine should be at operating temperature. The doors and windows must be closed. (5) Insert a thermometer in the driver side center A/C (panel) outlet. Operate the a/c system until it (6) With the compressor clutch engaged, record the discharge air temperature, the condenser out pres- (7) Compare the discharge air temperature read- ing to the Performance Temperature and Pressure (8) Compare the discharge (high side) and suction (low side) pressure readings to the Performance Tem- Performance Temperature and Pressure Ambient Air Temperature 21°C (70°F) 27°C (80°F) 32°C (90°F) 38°C (100°F) 43°C (110°F) Maximum Allowable Air Temperature at Center Panel Outlet 7°C (45°F) 7°C (45°F) 13°C (55°F) 13°C (55°F) 18°C (64°F) Compressor Inlet Pressure at Service Port (Low Side) 138 to 207 kPa (20 to 30 psi) 172 to 241 kPa (25 to 35 psi) 207 to 276 kPa (30 to 40 psi) 241 to 310 kPa (35 to 45 psi) 276 to 345 kPa (40 to 50 psi) Condensor Out Pressure at Service Port (High Side) 1034 to 1724 kPa (150 to 250 psi) 1379 to 2068 kPa (200 to 300 psi) 1724 to 2413 kPa (250 to 350 psi) 1999 to 2689 kPa (290 to 390 psi) 2413 to 2965 kPa (350 to 430 psi) (9) Compare the compressor discharge and suction (evaporator inlet) pressure readings to the Perfor- 24 - 2 HEATING & AIR CONDITIONING AN HEATING & AIR CONDITIONING (Continued) |