High Pressure Cutoff Switch

The system has a high pressure cutoff switch. This switch normally closes at 1035-1379 kPa (150-200 psi). The switch opens at 2827-3103 kPa (410-450 psi) in order to interrupt the voltage to the compressor clutch coil. This stops the compressor from cycling, and prevents the pressure relief valve from discharging refrigerant and oil.