FAA Approved Installation Manual for the
Report No 908
EDM-900 and EDM-930
Page 35 of 56 Rev I
Primary Engine Data Management System
Date 1-18-2013
33.
Programming the HP Constant
You must adjust the HP Constant once for your aircraft. You must perform this adjustment in the air while the aircraft is
in flight between 5,000 and 8,000 feet MSL.
1.
Enter the pilot program mode by simultaneously holding the STEP and LF buttons for five seconds.
2.
Tap STEP repeatedly until you see—for example— HPC = I25. Then hold both the STEP and LF buttons display
until you see ADJUST, followed by HPC= I25. The adjustment range for the HP Constant is 45 to 180.
3.
Set the MP and RPM per your POH to 70 percent power. Let conditions stabilize.
4.
Change the HP reading on the EDM-900 to 70 percent by adjusting the HP constant in the lower display by holding
or tapping the LF button. Percent HP should be close to 100 percent during takeoff at sea level.
5.
Tap the STEP button to proceed to the next step.
34.
Programming the MAP
Sets the manifold pressure calibration (an sets the Carbureted fuel pressure zero points).
You may need to correct the MAP based on the
altimeter setting at a sea level airport.
1.
Enter the pilot program mode by simultaneously holding the Step and LF buttons for five seconds.
2.
Tap Step/OK repeatedly until you see—for example— HPConstant=125. Then hold both the first two buttons
Step/OK and Change buttons display until you see Adjust, followed by HP Constant=125.
3.
Again, Hold both the two buttons, Step/OK and Change buttons display until you see ADJUST, followed by
MAP+0. The adjustment range for the MAP is ±3.0 in Hg. As you adjust the MAP up or down you will see a
change in the MAP gauge under RPM. When you see the correct setting stop.
4.
Tap the Step/OK button to proceed to the next step or hold both buttons again to exit setup.
Do this one time and only if the MAP on your manifold pressure gauge doesn't match the MAP shown on the EDM-900
You must do this on the ground with the engine turned off.
A. Absolute calibration: the table on page 27
Unless your airfield is close to sea level, do not set MAP to the local altimeter setting since that setting is the pressure
corrected to sea level, and is not the same as your field elevation pressure.
Tap or hold the LF button to change the MAP value.
Tap the STEP button to proceed to the next item.
35.
Selecting Fuel Pressure Type (EDM-900 only)
To properly display Fuel Pressure values, the EDM must be told what type of Fuel Pressure sensor is connected to the
EDM. This is normally set at the factory for new installations. To set or modify the type of Fuel Pressure sensor
connected to the EDM, follow these steps:
1.
Enter Pilot Program Mode by holding the STEP and LF buttons for 5 seconds
2.
When the EDM enters Program Mode, tap the button labeled “
NEXT
” until
END?
Is displayed in the scanner
message area.
3.
Again hold the
STEP
and
LF
buttons until the EDM enters
Factory Program Mode.
4.
After “
Factory
” is displayed in the scanner message area, tap the
NEXT
button until
FUEL PRESSURE = is
displayed in the scanner message area.
5.
Hold the
STEP
and
LF
buttons until the word
ADJUST
appears in the message area
6.
Tap the
PLUS
or
MINUS
buttons to change the selected Fuel Pressure sensor type.
7.
To save the selected value, hold the
STEP
and
LF
buttons until the word
SET
appears in the message area.
