Ford Corsar Repair Manual page 789

SERVICE PROCEDURES
Refrigeration Cycle
REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser, the receiver
drier, through the evaporator, and back to the compressor.
The refrigerant evaporation through the evaporator coil is controlled by an externally equalized expansion
valve, located inside the evaporator case.
FREEZE PROTECTION
The compressor cycles on and off to maintain the evaporator temperature within a specified range. When
the evaporator coil temperature falls below a specified point, the thermo control amplifier interrupts the
compressor operation. When the evaporator coil temperature rises above the specification, the thermo
control amplifier allows compressor operation.
REFRIGERANT SYSTEM PROTECTION
Dual-pressure switch
The refrigerant system is protected against excessively high or low pressures by the dual-pressure switch,
located on the receiver drier. If the system pressure rises above, or falls below the specifications, the
dual-pressure switch opens to interrupt the compressor operation.
Pressure Relief valve
Opens at a pressure above
3.3
Mpa thereby discharging refrigerant t o the atmosphere. If this valve has opened,
check the refrigerant system for faults and rectify before recharging.
Receiver drier
Fusible plug Dual-pressure switch