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  • V-Class
  • 06/2020
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Operating the switch clock (auxiliary warm-air heater)
DANGER Risk of fatal injury due to poisonous exhaust gases

If the tailpipe is blocked or sufficient ventilation is not possible, poisonous exhaust gases such as carbon monoxide may enter the vehicle. This is the case in enclosed spaces or if the vehicle gets stuck in snow, for example.

Always switch the stationary heater off in enclosed spaces without an air extraction systems, e.g. in garages.
Keep the tailpipe and the area around the vehicle free from snow when the engine or the stationary heater are running.
Open a window on the windward side of the vehicle to ensure an adequate supply of fresh air.
WARNING Risk of fire due to hot stationary heater components and exhaust gases

Flammable materials such as leaves, grass or twigs may ignite.

When the stationary heater is switched on, make sure that:
hot vehicle parts do not come into contact with flammable materials.
the exhaust gas can flow out of the stationary heater exhaust pipe unhindered.
the exhaust gas does not come into contact with flammable materials.
NOTE Damage to the auxiliary heating due to overheating

If the flow of hot air is blocked, the auxiliary heating may overheat and switch off.

Do not block the flow of hot air.
NOTE Battery discharge caused by stationary heater or stationary ventilation operation

Operating the stationary heater or stationary ventilation drains the battery.

After heating or ventilating the vehicle twice, drive for a longer period of time.
Activates the switch clock

The switch clock will switch to standby mode after ten seconds. The display will go off.

Saved settings will not be lost when the switch clock switches to standby mode.

Press and hold the button until menu bar and the time are shown on the display.
Setting the day, time and operating duration

When you switch the auxiliary heating on for the first time after a malfunction, set the day and time.

You can find further information on malfunctions under "Problems with the auxiliary warm-air heater".

Activate the switch clock.
Press the or button until the symbol flashes on menu bar .
Press the button.

The selected day will flash in program column .

Press the or button to select the desired day.
Press the button.

The selected day will be stored.

The hour value on the clock will flash.

Set the hour and minute value on the clock to correspond with the day and confirm using the button.

The time will be stored. Program column will not be shown and the operating duration will flash on display section .

The operating duration set is the default setting for immediate heating mode. You can set the operating duration within a range of 10 to 120 minutes or to continuous operation.

Press the or button to set the minute value or the symbol to select continuous operation.
Press the button.

The operating duration will be stored and the time will be shown on display section .

Setting the heating level

You can set the heating level to between 10 and 30.

The heating level corresponds to a preselected temperature for the vehicle interior. This is a guide value and, depending on the ambient temperature, may differ from the actual vehicle interior temperature.

Activate the switch clock.
Press the or button until the symbol flashes on menu bar .
Press the button.

The heating level will flash on display section .

Press the or button to set the desired heating level.
Press the button.
Immediate heating mode
To switch on:
activate the switch clock.
Press the or button until the symbol flashes on menu bar .
Press the button.

The symbol will be shown on display section and the operating duration will flash.

Set the operating duration.

The temperature level will be shown on display section .

To switch off:
Press the or button until the symbol flashes on menu bar .
Press the button.

The symbol will not be shown on display section .

The auxiliary heating will continue to run for approximately three minutes and will then switch off automatically.

Preselected heating mode

Preselected heating mode is available only for vehicles that are not equipped to transport hazardous goods.

You can set three preselection periods using the switch clock.

When setting the preselection period, make sure that it corresponds not to the switch-on time but to the switch-off or departure time. The auxiliary heating will start up automatically prior to departure and run for the set operating duration.

If identical preselection periods (time and day) are set in the preselection memory, only the last preselection period set will be saved.

When switching on the auxiliary heating for the first time following a malfunction or voltage supply interruption, you will need to set the preselection periods again.

To set the switch-on time:
activate the switch clock.
Press the or button until the symbol flashes on menu bar .
Press the button.

The preselection memory numbers will be shown in program column . The selected preselection memory number will flash.

Press the or button to select the desired preselection memory number.
Press the button.

The preselection memory number will be selected. The days will be displayed.

Set the day and time as described in the "Setting the day, time and operating duration" section.

The preselection period will be stored. Program column will be hidden. The message on and symbol will appear on the display section.

Press the button.

The operating duration will flash on display section .

Set the operating duration.

The operating duration for the preselection period will be stored. The time and the number of the set preselection memory will be shown.

An underscore denotes the preselection memory that will be next to be activated in chronological order. The selected day will also be shown.

To deactivate switch-on time:
complete the steps as described in the "Setting the switch-on time" section.
If the symbol is shown on display section : press the or button until off appears.
Press the button.

The preselection period will be deactivated and the time will be shown on display section .