Operating instructions

Both timers enable you to preset the start time of the heater up to 7 days in advance.
It is possible to program 3 different starting times, of which only one can be activated at any one
time.
The model 1531 “Comfort” Timer features a wakeup alarm function and an error code display.
The Timer can be programmed in that all flashing symbols can be adjusted by means of the and
buttons. See table 201 below for setting reference or full instructions supplied with timer.
2.6 Digital Timer Operating Instructions
Note: For purposes of these instructions,1529 timer uses a symbol button for programming where
the 1531 timer uses a symbol button.
Switching the heater on Manually: by pressing the button (continuous heating mode)
Automatically: by programming the heater starting time
Switching the heater off Manually: by pressing the button
Automatically: after the programmed operating time has elapsed.
With the heater running: by programming the remaining operating time.
Setting time / day of
the week
Press the button for more than 2 seconds - time of the day is flashing - and set the clock
using the and buttons. After 10 seconds, day of the week begins flashing - set the day
of the week in the same manner as the time.
Viewing the time With the ignition switched off: press the button (bus wiring).
Programming heater
starting time
Press the button - the memory location is flashing - using the and buttons set start of
the heater operating time. After 10 seconds, day of the week begins flashing - set the day of
the week on which the heater is to turn on.
By repeatedly pressing the button, memory locations 2 and 3 can be programmed or the
time display mode can be reached.
Recalling / erasing
preset times
Repeatedly press the button until the desired memory location is displayed. To erase the
preset time, press the button several times until the time of the day is displayed instead of
the memory location.
Programming duration
of operating time
The heater must be switched off. Press the button for 3 seconds - operating time is
flashing - and set the desired operating time (10 to 120 minutes) using the and buttons.
Setting the remaining
operating time
(Bus wiring Option)
Set the desired remaining operating time (1 to 120 minutes) using the and buttons. The
remaining operating time refers to the time the heater still continues to remain in operation
after the vehicle ignition is turned off. It can only be changed while the heater is in operation
and the ignition switched off.
Setting the wakeup
time
(Model 1531 Digital
Comfort Timer Only)
A wakeup time can only be programmed on the “1531” comfort digital timer. The wakeup
time is not bound to a specific day of the week. Repeatedly press the button until the bell
symbol appears on the display. Set the desired wakeup time using the and buttons.
The alarm clock turns off after 5 minutes or when one of the buttons is pressed.
Recalling / erasing the
wakeup time
To recall the wakeup time, repeatedly press the button until bell symbol appears on the
display - read off wakeup time. To erase the wakeup time: press the button until the bell
symbol is no longer visible on the display.
Remote control Possible by means of an optional external signal.
Table 201: Digital Timer Instructions
203
Thermo 90 S 2 Operating the Webasto Thermo 90 S