Refrigerant Containment Switch (Dual Function)
DESCRIPTIONThe dual function refrigerant containment switch controls operation of both the A/C clutch and the electric cooling fan. The switch contains electrical contacts that are normally closed. When head pressure rises to approximately 3068 kPa (445 psi), the contacts open causing the A/C clutch to disengage. When head pressure drops to approximately 1724 kPa (250 psi), the contacts again close and allow for operation of the A/C compressor. Shutting down compressor operation prior to the pressure relief valve set point 3103-4137 kPa (450-600 psi) ensures containment of the refrigerant in the A/C system.
COOLING FAN CONTROL
The switch also contains a second set of normally open contacts that control the operation of the electric cooling fan. When discharge line pressure reaches approximately 2241 kPa (325 psi), the switch contacts close and engage the cooling fan into high speed operation. When pressure drops to approximately 1896 kPa (275 psi), the contacts again open and the fan is disengaged from high speed operation.