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• There is a high and low pressure side in an AC system. The high
side begins inside the compressor. High pressure continues
through all fittings and hoses that connect the condenser, the
receiver-drier, and expansion valve or other refrigerant metering
device at the inlet to the evaporator. As refrigerant leaves the
expansion valve or other metering device and enters the evapora-
tor tubing, the pressure drops. It remains low in hoses and any
components that connect orcontrol the refrigerant as it moves
into the suction side of thecompressor. AC system components
allow refrigerant to change state easily. They control and contain
refrigerant as it moves inside the system.
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