3FUNCTIONAL DESCRIPTION
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EBASTO
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CHOLASTIC
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ERIES
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3.3 Switching Off
When heating is no longer required, switch the Webasto heater off. The fuel solenoid valve halts the fuel supply,
combustion stops and the indicator light turns off. The Combustion air fan and the water pump remain on for another
2-3 minutes (after run cycle) purging the combustion chamber of any fumes.
3.4 Engine Preheating
1. Set the timer 30 min. to 1 hr. before you want to start the engine. The heater will start up at the set time. (See
timer operating instructions). Or switch the toggle switch or “Instant On” switch on your timer in the vehicle dash
to “ON”. The heater will start up.
2. When the run time has elapsed on your timer or engine preheating is no longer required, switch the Webasto
heater “OFF”. The heater will begin a brief after-run (cool down) cycle.
3.5 Boost Heating for Engine and Passenger Compartment
1. Switch the toggle switch (or the “Instant On” button of the timer) in the vehicle dash to “On”. The heater will start
up if the coolant temperature is below 75 °C (167 °F). Above this temperature only the water pump will run.
2. When boost heating is no longer required, switch the Webasto heater “Off”. The heater will begin a brief after-run
(cool-down) cycle.
3.6 Operation with 7-Day Digital Timer Model 1531
The digital timer with 3 time settings permits the Webasto heater to be switched on and off instantly, or automatically
at 3 programmable starting times.
The operating time of the heater can be pre-selected. It is possible to program 3 different heating programs
according to your individual needs.
Only one preset starting time can be activated at any one time. When the ignition is switched on, the current time of
the day and the day of the week are displayed.
When the heater is in operation, the display and the buttons of the timer are illuminated.
Programmed Heater Operation
Three memory locations numbered 1 to 3 are available. Each memory location can be assigned a given time
together with the day of the week.
Pre-selected Starting Times
The pre-selected starting time is the time at which the heater will be switched on automatically.
We recommend that memory locations 1 and 2 be used for presetting starting times within 24 hours of setting the
timer.
Memory location 3 can be used for a starting time within the next 7 days of setting the timer.
NOTE:
If the heater is switched on while the engine is at operating temperatures above 68 °C (155 °F) only the operation
indicator and the coolant circulation pump will be activated. The engine coolant temperature must fall below 68 °C
(155 °F) at the heater before the heater will begin heating operation.
NOTE:
Switching the Webasto heater on during the cool-down or “after-run” period is allowed. The heater will revert to
normal operational mode.
