11
Functional description
The cleaning control system enables the automatic, electronic cleaning of the contaminated thermal mass of a
rotary heat exchanger.
Standby indicates readiness for operation. A start signal from an external contact, the start button or an
optional time switch activates the cleaning procedure.
Following the start command, the carriage travels without media to the centre of the rotor. When the sensor
reaches the centre, the cleaning procedure itself begins and the rotor rotates.
Caution:
The heat exchanger
wheel must be released at all times while cleaning.
The relays switch on the solenoid valves for air and water. Due to the rotation of the rotor, the clock sensor
receives the first pulse and the carriage is driven towards the periphery. The carriage should advance by no
more than one nozzle width; otherwise, the cleaning will not be so effective.
This procedure is repeated until the cleaning carriage reaches the periphery of the sensor. The direction of
travel then changes and the water relay falls. In order to remove the water from the thermal mass, the clea-
ning carriage then executes return movement with compressed air.
On reaching the centre of the sensor, the relay for air switches off and the carriage travels to the park position
at the periphery of the rotor. The cleaning procedure is now completed.