Dynalco AF-900PC Air/Fuel Ratio Controller - Manual (Page 50)

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19. Start Up Procedure
1) Before starting the engine, make sure the AF900PC is powered up.
2) The following AF900PC parameters need to be set prior to starting engine. It
is recommended to use the DynaHost user software main screen
configuration (see section 10.3) for setting the following:
• Manual
Mode
• Valve output = 100%
• Gain = 50%
• Reset = 50%
• Post O2 sensor off
3) Since the AF900PC is in “Manual” mode and valve outputs are set to 100%
or full open positions, the fuel pressure will be the same as it was before the
AF900PC was installed.
4) Start the engine and allow to warm up to normal operating temperature.
5) Next, increase engine load to 100% or normal operating load.
6) Check the O2 sensor output voltage on each bank using either the front
display or using the DynaHost user software. This will give an indication of
where the engine has historically been running.
7) Set the O2 sensor setpoints to the same voltage read above.
8) Adjust the power screw adjustments on the carburetor(s) to full rich position.
The O2 sensor output voltages should increase.
9) Decrease the manual output settings slowly by 5% decrements until the O2
sensor output voltages match close to the readings taken in step 6 above. Be
careful not to lean the A/F too far as this could cause engine damage.
10) Switch to AF900PC AUTO mode. The AF900PC will now be controlling the
output fuel valves so that the actual O2 sensor outputs match the setpoints.
11) Install an emissions analyzer in the exhaust and fine-tune the LEFT BANK
SP and RIGHT BANK SP for the desired air/ fuel ratio. It is best to make
small adjustments (no more than 10 mV at a time) and allow engine time to
adjust before re-checking emissions.
12) The AF900PC will now control the air/fuel ratio to maintain the O2 sensor
output voltage established by by tuning the LEFT BANK SP and RIGHT
BANK SP.