Woodward GECO, Technical Manual, Page: 61 / 90

Manual 03554 GECO

Stoichiometric
Woodward 53
Required Installer-Provided Components

9–30 Vdc power supply, 70 W for the control (for GECO Stoichiometric)

19.2–28.8 Vdc (class 2) power supply, 83 W for the control (for GECO Vista
model)

Electrical conduit

Wiring as shown in the plant wiring diagrams

“G-lead” type ignition speed signal (250 V max), OR magnetic pickup speed
signal (100 V p-p max), OR switched “run” signal of 3–32 Vdc

Oxygen sensor port (18 x 1.5 mm internally threaded, gasket spot face or
weld bung)

Fittings for fuel source, fuel trim valve and injection point

Air-tight high-temperature fittings for catalyst temperature sensors

Mounting bracket for the fuel metering valve

Hose, clamps, and fittings for MAP pressure signal
Input power must be supplied from an NEC or CEC class 2 power
source.
Optional Installer-Supplied Components

Appropriate fuel plumbing from 15–30 psig fuel source to the shut-off valve
and trim valve and from the valve to the injection point

Manual shut-off valve(s) for the trim valve plumbing (1/4-turn valve)

Indicator lights/annunciator panel

Alarm relay circuit

Shutdown relay circuit
Unpacking
Before handling the control, read Electrostatic Discharge Awareness at the
beginning of this manual. Be careful when unpacking the electronic control.
Check the control for signs of damage such as bent panels, scratches, and loose
or broken parts. If any damage is found, immediately notify the shipper.
Power Requirements
The GECO Vista control requires a voltage source of 19.2 to 28.8 Vdc, and
draws a maximum of 83 W. The GECO Stoichiometric control requires a voltage
source of 9.0 to 30.0 Vdc, and draws a maximum of 70 W. A 5 A slow-blow fuse
should be installed in-line with the power supply input.
If a battery is used for operating power, an alternator or other
battery-charging device is necessary to maintain a stable supply
voltage.
All tunable values which have been changed in the programming mode will stay
in memory on power supply failure. For proper operation, the control requires an
engine speed signal from a magnetic pickup speed sensor or ignition system
“G-lead” (250 Vdc max.) from the ignition or a 3–30 V “run” signal.
To prevent damage to the control, do not exceed the input voltage
range. Make sure that the alternator or other battery-charging device
is turned off or disconnected before disconnecting the battery.