MotorVac CarbonClean System MCS 245 - Manual (Page 9)

Theory of Operations
Detailed descriptions of the various operations, control buttons, and LED indicators are listed below.
Fill Operation:
• Press and Hold the FILL/PURGE button. This opens the solenoid and starts the pump motor in the Fill/Purge
direction. Releasing the button stops the motor and closes the solenoid.
• Whenever the motor is pumping in the Fill/Purge mode, the DOWN ARROW LED (Pointing down away from
the picture of the car on the panel) is on.
Cleaning (Service) Operation:
• Press and hold the START button. This opens the solenoid and starts the pump motor in the Service direction
• Release the START button after the pressure gauge reads at least 5 PSI. The pump will continue to run and
TIME LED will display time remaining.
• When the run time is complete, the pump motor stops and warning beeper will sound for 6 seconds. One
second after the pump motor stops, the pump motor will start and run in the purge mode (reverse) direction for
5 seconds. The solenoid remains open during the purge mode. When the purge is complete, the pump motor
stops and the solenoid closes.
• If the pressure drops below 4 PSI while the engine is running, or the START button is released before the
pressure reaches 4 PSI, the motor will stop for one second, then run in the purge mode (reverse direction) for 5
seconds with the solenoid open. When the purge is complete, the pump motor stops and the solenoid closes.
• Whenever the unit’s motor is pumping in the clean mode the UP ARROW LED (Pointing up towards the
picture of the car on the panel) is on. This LED will blink while the pressure switch is open (less than 4 PSI)
and stays on solid when the pressure switch is closed (greater than 4 PSI).
Leak Test Operation:
• While in the service mode, press and release the LEAK TEST button. The solenoid will close and the TIME
LED will show the leak test time remaining.
• During the leak test, only the TIME LED display will be on.
• To end the leak test mode and begin the cleaning service, press the start button.
• To end the leak test mode, press and release the STOP button. This will open the solenoid and begin the purge
mode.