Dual-Pressure Switch

With temperature at 77°F (25°C), A/C system properly charged, and A/C system (compressor) under operation, check dual-pressure switch operation. If pressure is 28 psi (2.0 kg/cm² ) or less, low pressure switch should not show continuity. If pressure is 455 psi (32.0 kg/cm² ) or more, high pressure switch should not show continuity. If continuity is not as specified, replace dual-pressure switch.