| Functional description of auxiliary heater Thermo Top V |
| Temperature at temperature sensor -G18- less than 50 °C. |
| Temperature at ambient temperature sensor -G17- must be below approx. +5 °C. |
| Turning on the switch enables operation of the auxiliary heater. The glow plug with flame monitor -Q8-, the combustion air blower -V6- and the circulation pump -V55- begin to operate. After 30 seconds, the metering pump -V54- is switched on and the combustion air blower -V6- is switched off for 3 seconds. Then the combustion air blower -V6- runs up in two stages to nearly full load within 56 seconds. After a stabilisation phase (attaining steady motor speed) of 15 seconds, the combustion air blower -V6- is again brought up to nearly full load in a 50-second stage. |
| After reaching full-load fuel delivery, the glow plug with flame monitor -Q8- is switched off and the combustion air blower -V6- is brought up to full speed. During the next 45 seconds as well as during normal operation, the glow plug with flame monitoring -Q8- assumes the task of flame monitoring and checks flame development. Then the automatically regulated heating operation begins. If no flame develops or the flame extinguishes, then the fuel supply is interrupted and a malfunction shut-down occurs with the combustion air blower -V6- continuing in run-on mode. If the flame is extinguished during normal operation, a new start is automatically initiated. |
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