SC preheater control element: explanation of the duty cycle

The SC preheater controls the engine-independent vehicle heating, and the starting time can be pre-programmed or the speed heating function selected. The increased memory capacity for pre-selected times represents a significant product optimization compared to previous models: up to seven times are programmable. Furthermore, in the event of power outages in the bus all settings will be retained for at least 72 hours and do not need to be re-entered.

With the ignition switched on in the as-delivered state the pre-selection timer has a maximum duty cycle of 30 minutes, i.e. the duty cycle of the heater can be set by the bus driver within the range 10 to 30 minutes. Depending on requirements, the maximum value can be increased by the workshop staff via a parameter mode to up to 90 minutes or reduced to under 30 minutes.

When the ignition is switched on, with the speed heating function the heater is in continuous operation with no time limit.

Detailed service instructions for activating the parameter mode, individual changing of parameters and all other settings are ready for downloading in the Service area on our homepage under the following link:

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