Engine Pre-Heater - Deif SGC 420 Mk II User Manual

Cooler control
When the coolant temperature is more than the ON Threshold value, the output is on. When the coolant temperature is less
than the OFF Threshold value, the output is off.
8.6

Engine pre-heater

This function is used to control the temperature of the engine before the engine starts. The function is only active when the
engine is stopped. A temperature sensor is used to activate an external heating system to keep the engine at a minimum
temperature.
The function includes a set point and a hysteresis. In the example, the set point is 40 °C with a hysteresis of 3 °C. The
controller opens the engine heater relay when the engine has reached 43 °C and closes when the engine temperature is 37
°C. You must select a relay for the engine heater. If the engine heater is active, and the manual control command has been
activated, the engine heater relay is opened. When the command is activated again, the heater relay closes if the
temperature is below the set point.
Configure the preheat function
1. Go to Analogue Inputs and select one of the analogue inputs.
2. Set the Use Input As to Engine Coolant Temperature Sensor.
3. Go to Digital Outputs, select one of the digital outs, and set the source as Preheat Output.
4. Go to Engine and then select Preheat.
5. Configure the preheat parameters.
User manual 4189341360A EN Page 83 of 99