Vernet M22x150 thermocontact – 70 °C – 75 °C

The Vernet cooling fan thermocontact with an M22x150 thread controls fan operation based on the cooling fluid temperature. The switching temperatures specified for part number TS1567 are 70 °C and 75 °C. The assignment of these two values to the on and off thresholds remains to be confirmed.

These temperatures are fixed and do not correspond to an adjustable range. They pertain to the fan’s electrical control and should not be confused with the thermostat’s opening temperature, which regulates cooling fluid flow.

Selecting the Appropriate Temperatures for the Engine

Each engine has an optimal operating temperature range defined by its manufacturer. The choice of thermocontact must be consistent with the requirements of the engine, the thermostat, the radiator, and the location of the thermocontact within the cooling system. An earlier fan activation is not always beneficial.

The switching temperatures correspond to the temperature at the thermocontact. Therefore, they do not, on their own, define the engine’s optimal operating temperature.

Mounting Tips for the Vernet Thermocontact

Use a cooling hose adapter with an M22x150 thread, sized to fit the hose’s inner diameter, or use an available location with the same thread on the cooling system. The thermocontact element of the thermal switch must be in contact with the cooling fluid. Check the available space, the connections, and the seal of the mounting.

Installation with a relay: The thermocontact must be connected to the control circuit of a relay, not to the power circuit. It controls the relay coil, while the relay’s power contacts supply power to the fan. Do not power the fan motor directly through the thermocontact.

Use a relay, a protective fuse, and cables with a cross-section suitable for the fan’s consumption, taking its starting current into account. Follow the wiring diagrams for the relay and the vehicle.

Technical Specifications of the Vernet M22x150 thermocontact

• Brand: Calorstat by Vernet.
• Manufacturer part number: TS1567.
• Function: Radiator fan thermal switch.
• Specified switching temperatures: 70 °C and 75 °C; on/off settings to be confirmed.
• Temperature settings: fixed temperatures, not adjustable.
• Thread: M22x150, with a nominal diameter of 22 mm and a pitch of 1.5 mm.
• Mounting: on a hose adapter or any available mounting location with an M22x150 threaded hole.
• Electrical connection: relay control circuit; direct power supply to the fan is prohibited.
• EAN code: 3531650010844.

Key features of the Vernet thermocontact

• Fan control based on cooling fluid temperature.
• M22x150 threaded mounting on a compatible mounting location or adapter.
• Integration into a control circuit with a separate power relay.