Webasto TSL 17 Coolant Heater
www.webasto.us 4 Webasto Product N.A., Inc.
Operating the Webasto Coolant Heater
Before switching on the Webasto TSL 17, review the following procedures on the proper operating techniques to
ensure a comfortable interior. The Webasto can be activated either by a supplied ON / OFF rocker switch, or optional
7 Day Digital Timer.
Heater Activation with the Standard Equipped Rocker Switch
Figure 2. Standard Equipped Rocker Switch
The TSL 17 heater is activated by depressing the rocker switch to the ‘ON’ position. Once switched on, the heater
begins operation and shortly thereafter, heated coolant is circulated through the engine’s coolant system.
ATTENTION
The heater will not operate using the rocker switch unless the vehicle’s ignition key is switched to the
‘ACCESSORIES’ position for preheat (engine not running) or ‘IGNITION’ position (engine running) for boost
heating.
Heater Deactivation
Manually:
By returning the rocker switch to the ‘OFF’ position or, if the optional timer is installed, by pressing the “Heater On/Off
Button” on the timer (see timer operating instructions on next page). The heater can be switched off at any time
during operation.
Automatically:
Whenever the ignition key is switched off, the heater will also shut-down. If the optional timer is installed, the heater
will be switched off automatically once the timer reaches the end of a timed cycle (preheat mode) or whenever the
ignition is switched off while the heater is running (boost heat mode).
In all cases, whenever the heater is turned off, it will immediately begin a brief cool-down period. The cool-down
period allows the heater to burn off any residual fuel and purge the combustion chamber with cool air.
ATTENTION
The heater will automatically shut-down anytime the ignition key is switched to the ‘OFF’ position. This
prevents the heater from being unintentionally left on for extended periods and possibly discharging the
vehicle batteries.
WARNING!
To avoid the possibility of fire or explosion causing injury or death, the Webasto heater MUST be
switched off before entering fueling stations, during refueling or entering areas where flammable or
explosive materials, gases, fumes or dusts are present.
Operating Instructions
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