Merlin
Instruction manual V1.4
Pag:
13
the prime function so that the engine becomes flooded by fuel, as this will cause an
uncontrolled fire at next startup.
Starting the engine.
Set the throttle stick down and the trim up. “Idle” - Confirm that the LED in the ecu is blinking in
a sequence of 2 blinks and the screen shows
"Ready"
-
!Ready to start!.
In the case that the exhaust temperature is over 100º, the ecu will power the starter to cool
down the engine. Wait until the cooling sequence finish.
Move the stick to full throttle and
immediately
back to idle again. The Ecu will begin the startup
sequence as described below:
First the internal glow plug will be energized. After 3 seconds, the starter will be powered up to
have the rotor turning at slow speed (3000- 5000 RPM).
Once the rotor is at correct speed, the pump and solenoid valves will be energized. Few seconds
later the kerosene will ignite and the exhaust temperature will begin to increase. The rpm and
pump power will increase automatically. During this phase the data terminal will display
“IGNITION”.
When the ignition is detected, the data terminal reading will change to “SwitchOver”, during this
phase the fuel will be routed to main injectors and the speed of the rotor will be progressively
increased to about 10,000 -15.000 RPM, depending on engine model.
Once this phase is finished, the reading will be “FUEL RAMP”. In this phase the ignition system is
switched off. The fuel flow and starter power will be increased automatically to increase the RPM
up to idle RPM. Before arriving to idle the Ecu will automatically disconnect power to the starter.
When the rotor speed reaches idle, the screen will change to “Run IDLE” and the engine speed is
adjusted to the IDLE RPM.
The engine is running!
Control of engine power/rpm is now handed back to the transmitter and controlled by the
position of the throttle stick. Increase/decrease the throttle slowly, verifying that the engine
accelerates/decelerates following the throttle command.
Take special care around the engine
intake; keep your hands at a safe distance along with any other objects as they can
be easily ingested.
Engine shut down procedure:
To shut down the engine lower the trim and the stick. It is recommendable that before shutting
down the engine to restrain the model and then raise the throttle stick to approximately 25%,
allowing temperatures to stabilize for around 5 seconds before carrying out the shutdown
procedure. After the shutdown the ecu will keep the starting motor running to cool the engine
under 100ºc. A special feature on this ecu system is that the power of the receiver can be
switched off before the cooling procedure is complete. The ecu will shutdown itself when the
procedure is complete.
WHAT TO DO IN THE CASE OF AN EMERGENCY
During the start sequence the Ecu will be in charge of everything, controlling temperature and
RPM. The only thing the user can do is to abort the sequence by lowering the trim in the case
that something abnormal (excessive flames in the exhaust, etc).
