ICM Head Pressure Controls for Low Ambient Conditions Air conditioning systems work harder during hot weather but most of the serious problems occur during coldest weather. Air conditioning systems are very commonly used during low ambient conditions. When your condenser is surrounded by cold weather the head pressure drops and the system becomes less efficient which can lead to evaporator freeze-ups, hydraulic lock-ups, liquid slugging, and worst case scenario a compressor burn out. The solutio
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