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A I R CONDITIONING - L .H. R . H. STEERING Type of Evaporator Weather Air Temp "F . I . Refrigeration System Fault Diagnosis Low Side Pressure For any refrigeration system to function properly all in good working order. The unit cooling cycle and the relationship between air The length of any cooling cycle is determined by such factors as ambient temperature and humidity, thermostat setting, compressor speed and air leakage of the cooling cycle would be indicative of abnormal operation of the air conditioner. The low and high side pressures at the compressor will The following conditions should be checked after 1. 2. All high side lines and components should warm to the touch. should be at the same temperature (warm). Any on the inlet to the expansion valve may indicate a defective valve or moisture in the 30% and compressor pressures and evaporator air discharge 4. 5 . 45-60°F 25-30 Over 90°F (Over 32°C) (1.8-2.1) 220-270 (15 High Side Pressure t I I I NOTE: 2. Low and high side pressures are guides not specific limits. on dry days, higher on humid days. Cool Day (2 1 -27°C) 35-45°F 15-20 (1.1-1.4) 160-200 (1 1.2-1 4) Warm Day (27-32°C) 40-50°F (4.4-10°C) 20-25 .4-1 .8) 190-240 ( 6.9) 7 |