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Manual Mode
During normal ECU function, the operator has no direct control of the fuel pump or fuel
shutoff valve. To prime the fuel pump and fuel lines (or for fuel pump test purposes), it
is necessary to open the fuel shutoff valve and run the fuel pump manually. For this
purpose, the ECU has a special feature that opens the fuel valve and acts as a speed
control for running the pump.
I
I
Extremely Important:
Manual mode allows the fuel pump to operate without the turbine running. However, if
the fuel feed line is not removed from the turbine during this procedure, it will become
flooded with fuel. When this occurs, the next turbine start can become highly
combustible!
Before activating the manual mode, ALWAYS remove the fuel feed line connected
to the turbine.
To activate manual mode, the AUX switch must be
Off
and the throttle stick and trim to
their minimum positions. All LED’s will be off. Manual mode can now be activated by
pressing the GSU
MANUAL
button or by pressing the small switch on the LED I/O
board. When manual mode is active, the yellow
Standby/Manual
LED will blink and
the fuel shutoff valve opens. Move the AUX switch to the
Start/Standby
(middle)
position, and the throttle stick can then actively control the fuel pump. Returning the
throttle stick to its idle position will stop the fuel pump.
In manual mode, by placing the AUX switch in the
Auto-Off
position, the throttle stick
will work as an on/off switch for the fuel pump. When the throttle stick is advanced from
idle, the fuel pump will run at a steady pre-programmed speed – the minimum setting
that will reliably run the pump. If the throttle stick is returned to idle, the pump will shut
off. During startup, this speed is used to establish initial voltage for the fuel pump.
Manual mode may be disengaged by two separate methods:
•
Press the
MANUAL
button on the GSU or the LED I/O board switch, a second time.
•
By repositioning the AUX switch back to its
Off
setting.
The yellow
Standby/Manual
LED will stop blinking!
