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Operating instructions

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2. Operating the Webasto Thermo Top C (TTC)
Before switching on theTTC, set vehicle heating system to the heat position and open any shut
off valves. Depending on the type of control installed in the dashboard of the vehicle, the TTC can
be operated by the following methods.
2.1 Switching On
Using a Switch: Using the Optional Digital Timer:
Using the Switch:
When the switch is used for turning ON the TTC, the operation indicator (toggle) lights up.
Shortly thereafter, the heater begins operation and delivers heated coolant to the engine.
Using the Optional 7-Day Digital Timer:
1. Set the timer up to 2 hrs. before you want to start the engine. The heater will start at set time.
(See timer operating instructions.)
Or switch fiinstan onf switch on your timer in the vehicle dash to ON The heater will start up.
2. When time is elapsed on your timer or engine preheat is no longer required, switch the TTC
heater OFF The TTC will go through the after-run cycle.
Pushing the fiinstan heatf button or when timer setting reaches desired start time, the fioperatio
indicatorf on the timer will light, signaling that the heater is in operation.
See section 2.3 fiOperatio with 7-Day Digital Timerf for complete instructions.
Startup Sequence:
The coolant circulating pump, ceramic igniter and combustion air fan start operation and after
approximately 60 seconds combustion starts (audible combustion sound).
After the coolant temperature has reached the set point of 170 °F (77 °C) the TTC will
automatically adjust its heat output to a lower operating range (part-load heat output).
If the temperature of the coolant continues to rise and climb over 174 °F (79 °C) at the heater outlet,
the heater will cycle off.
When the temperature falls below 149 °F (65 °C) the heater will restart and repeat the heating cycle.
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Thermo Top C (TTC) 2 Operating the Webasto
NOTE:
If heater is being switched on while the engine is warm only the circulating pump will run, coolant
temperature must fall below 86 °F. (30 °C.) before heater starts.