Air Conditioner Pressure Switch
Usage:
Typical Example
Terminal one is high/low pressure protection
Terminal two is high/low pressure protection
Terminal three is fan drive override protection
Terminal four is fan drive override protection
High/Low pressure protection
Pressure Increase
The normally open switch closes when the pressure rises above 275 kPa (40 psi) and remains closed until the pressure rises above 2240 ± 172 kPa (325 ± 25 psi).
Pressure Decrease
The normally open switch closes when the pressure descends below 1585 ± 172 kPa (230 ± 25 psi) and remains closed until the pressure descends below 155 ± 52 kPa (22 ± 8 psi).
Fan drive override protection
The override closes when the pressure rises to 1585 ± 138 kPa (230 ± 20 psi) and remains closed until the pressure drops below 1137 ± 103 kPa (165 ± 15 psi).
Caterpillar Information System:
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