Refrigerant Pressure Sensor / Switch, HVAC
A/C Refrigerant SwitchesHigh Pressure F118:
Function: Switches A/C clutch off if system pressure is too high.
- Switch opens (compressor off): 28.2 - 31.0 bar (409 - 450 psi)
- Switch closes (compressor on): 10.3 - 17.2 bar (149 - 250 psi)
Tightening torque: 5 Nm (44 in. lb)
High Pressure F23:
Function: Switches coolant fan -V7- to 2nd speed.
- Switch closes (2nd speed on): 1.42 - 17.4 bar (206 - 252 psi)
- Switch opens (2nd speed off): 11.7 - 15.0 bar (170 - 218 psi)
- Difference between opening and closing switching points must be at least 2 bar (29 psi)
Tightening torque: 5 Nm (44 in. lb)
Low Pressure F73:
Function: Switches A/C clutch -N25- off if system suction pressure is too low (low refrigerant charge). This switch protects the compressor if the refrigerant system is empty.
- Switch opens (compressor off): 1.45 - 1.6 bar (21 - 23 psi)
- Switch closes (compressor on): 2.9 - 3.4 bar (42 - 49 psi)
Tightening torque: 5 Nm (44 in. lb)