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Test functions
Manual mode
During normal operation of the Jet-tronic the user has no direct control over the fuel pump or the
fuel shut-off valve. However, for filling the fuel lines or for test purposes it may be necessary to
control the fuel pump and/or the shut-off valve manually. A special manual operating mode is
provided for this purpose, and in this mode the Jet-tronic behaves as a precision voltage
controller (similar to a standard speed controller). In this mode the pump voltage corresponds to
the position of the throttle stick, and the shut-off valve is opened.
Testing / operating manually the fuel pump
1. Move the rpm-slider to the OFF position (-> all LEDs switched off).
2. Activate manual mode by pressing the "Manual" button on the Ground Support Unit (GSU),
or the small button on the LED board. The yellow "Standby" LED flashes, and the shut-off
valve is kept open all the time that manual mode is active.
3. Using the rpm-slider you can directly control the voltage fed to the fuel pump. In the lower
half of the slider's control throw the pump is always off. From mid position (idle) the fuel
pump starts running. The pump can be stopped at any time by moving the slider back to the
OFF position.
4. Terminate manual mode by pressing the "Manual" button or the pushbutton on the LED
board again
the yellow "standby" LED no longer flashes.
Important note:
Manual mode provides a means of starting and activating the fuel pump, although the
turbine does not run. This means that the turbine may be flooded with fuel unless you
cut off the fuel supply to the turbine beforehand. If you forget to do this, you can expect
a "firework display" next time you start the engine.
For this reason: Before you activate manual mode always shut off (-> disconnect) the
fuel feed line to the turbine, then there is no danger of anything untoward happening.
In manual mode the minimum rotational speed and the minimum temperature of the
turbine are not monitored, but all other safety parameters stay active (e.g. max. tem-
perature, max. rpm etc.).
Controlling and testing the fuel shut-off valve
As long as the manual mode is active (yellow "Standby" LED flashing), and also when the pump
voltage is other than zero, the shut-off valve is automatically opened (-> see above).
Controlling and testing the propane valve
1. Switch off the electronics.
2. Press and hold the "Min/Max" button.
3. Switch on the electronics.
4. Release the Min/Max button when the message "GasValve Test" appears on the screen.
5. Press the "Min/Max" button to test (open) the valve.
6. To terminate the test press the "Manual" button, or switch off the electronics.
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