Electric Water Pump and Fan Digital Controller

Controller Operation

When the ignition is turned on the Digital Controller will (after a self check to endure all is in working order) begin to pulse coolant around the system with the pump on for 10 seconds and then off for 30 seconds. Once the engine has warmed to within 20°C of your set temperature the controller will increase the frequency of the pulsing so the pump runs for 10 seconds and then is off for 10 seconds. This continues until the engine temperature is within 5°C of your set temp.

At this point the pump switches to continuously pumping and the flow rate varies to ensure the engine temp is stable. Once the Coolant reaches the set temp the pump then runs at full speed (Please see diagram below).

The Controller also manages the vehicles electric fan automatically, once the engine has reached +3°C above your set temperature it operates the fan.

Another significant benefit is that the Controller allows the EWP® & Fan to run on after ignition shutdown for either 3 minutes or until the coolant is 10°C below the set temperature to eliminate heat soak. As a failsafe, if the controller does not receive information telling it the coolant has attained a temperature of 40°C after 5 minutes, it goes into alarm mode (pump runs continuously at full speed). This ensures that the engine is protected against a sensor fault.