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The Davies Craig Digital Thermatic EWP/Fan Switch is designed for automotive enthusiasts and mechanics seeking precise control over engine cooling systems. It allows users to automatically activate electric water pumps (EWPs) or cooling fans at user-defined coolant temperatures, ensuring optimal engine performance and preventing overheating. A key benefit is its adjustable temperature range and the flexibility of sensor placement. However, it's important to note that this switch only controls the on/off function of an EWP and does not regulate pump speed, for which a separate controller is recommended.
| Model Part Number | 448 |
|---|---|
| Brand | Davies Craig |
The switch has an adjustable temperature range of 40°C to 110°C, which can be set using the button on the front of the unit.
No, this switch is designed to only turn an electric water pump on and off. It does not control pump speed. For speed control, the Davies Craig EWP/Digital Fan Controller is recommended.
The probe sensor can be inserted into the top radiator hose. The thermatic sensor screws into a waterway or radiator, or can be used with an adapter in a coolant hose. The choice depends on the installation accessibility and preference.
The kit is sold in a 12-volt configuration. For 24-volt operation, you will need to replace the two supplied relays with 24-volt compatible units, which are not included in the kit.
The 10-second delay is to prevent a sudden surge of electrical current when both fans start simultaneously. It ensures the first fan starts, followed by the second after a short interval.
The kit typically includes the Switch Unit, Mount Kit, Scotch Locks, Ring Terminal, Self-Tapping Screws, Wiring Connector, and either a probe sensor or probe and thermatic sensors.
The dimensions of the switch unit are 95mm x 65mm x 56mm.
Verify all electrical connections are secure and correctly wired. Check fuses. Ensure the sensor is properly installed and making good contact. Confirm the set temperature is below the current coolant temperature. For 24v systems, ensure the relays are 24v compatible.
Recalibrate the temperature setting using the button on the unit. Ensure the sensor is correctly placed for an accurate coolant temperature reading. If using the probe sensor, ensure it's fully submerged in the coolant flow.
Check the power supply connection to the switch. Ensure the vehicle's electrical system is functioning. Verify that the correct voltage (12v or 24v with appropriate relays) is being supplied.
Confirm the wiring for the second fan is correctly connected to the designated output. Ensure the unit is functioning otherwise. This feature is specific to twin fan setups.
Setup: Installation involves mounting the switch unit, connecting the chosen sensor (probe in a radiator hose or thermatic sensor in a waterway/adapter), and wiring it to the cooling fan(s) or EWP and vehicle power. Ensure all connections are secure and insulated. The temperature can be set using the button on the front of the unit within the 40-110°C range.
Compatibility: This switch is designed for use with 12v or 24v vehicle electrical systems. For 24v applications, the internal relays must be replaced with 24v units, which are not included. It can operate cooling fans or electronic water pumps (switching only, not speed control).
Care: Keep the unit clean and dry. Periodically check sensor connections for corrosion. Ensure the sensor probe or thermatic sensor is correctly positioned and making proper contact with the coolant or airflow path for accurate readings. Avoid using harsh chemicals for cleaning; a damp cloth is sufficient.
