Vernet M14x150 Thermocontact – 100 °C – 95 °C

The Vernet cooling fan thermocontact with an M14x150 thread activates the fan when the temperature reaches 100 °C, then shuts it off when the temperature drops back to 95 °C at the thermocontact.

These temperatures are fixed and cannot be adjusted. The 5 °C difference between activation and deactivation—known as hysteresis—limits repeated cycling when the temperature fluctuates around the activation temperature.

Selecting the Appropriate Temperatures for the Engine

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

The temperatures of 100 °C at activation and 95 °C at deactivation correspond to the temperature at the thermocontact. These temperatures alone do not define the engine’s optimal operating temperature and should not be confused with the thermostat’s opening temperature, which regulates cooling fluid flow.

Mounting Tips for the Vernet Thermocontact

Install an adapter on the coolant hose with an M14x150 thread, matched to 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.

Mounting 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 cable gauge appropriate 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 M14x150 thermocontact

• Brand: Calorstat by Vernet.
• Manufacturer part number: TS2605.
• Product type: thermocontact for cooling fan.
• Activation temperature: 100 °C.
• Shut-off temperature: 95 °C.
• Temperature settings: fixed temperatures, not adjustable.
• Switching hysteresis: 5 °C.
• Thread: M14x150, with a nominal diameter of 14 mm and a pitch of 1.5 mm.
• Mounting: on a hose adapter or any available mounting location with an M14x150 threaded hole.
• Electrical connection: relay control circuit; direct power supply to the fan is prohibited.

Key Features of the Vernet Thermocontact

• Automatic fan start and stop based on temperature.
• Separate activation and shutdown temperatures to limit frequent switching.
• Fixed calibration requiring no temperature adjustment.