Volvo VNL Operator's Manual page 197

192 Heating and Air Conditioning
Parking Heater Delayed Start
Symbol for delayed start of parking heater. The symbol flashes until the
function is changed.
To select the function to start the parking heater, use the "MODE" button to
switch between functions until the delayed start symbol appears.
Press the SET button. The hour digits start to flash.
Set the hour digits to the time when it is desired that the heater should start.
The up button increases the time delay and the down button decreases the
time delay.
Accept the delay hours by pressing the SET button.
Set the minute digits the same way as the hour digits were set.
Accept the delay minutes by pressing the SET button. The display will
change to ON. This means that the heater is ready to start when the set time
has been reached.
If the heater is not to be started with the time delay, press one of the up or
down buttons and OFF is now displayed. To alternate between ON and OFF,
press the up or down button, which means that the time delay for the heater
is engaged or disengaged.
Accept that the heater starts at the set time. At the same time as the button
is pressed, the display returns to the clock function.
If the time setting was not completed, the
display returns to the clock function 30
seconds after the last button was pressed.