J.P. Instruments EDM 740 Pilots Guide - Manual (Page 47)

For Your Safe Flight Page 47
Section 7 - Programming Horsepower Constant
For EDM’s equipped with FF, RPM, OAT and MAP, you will adjust the
HP Constant once for your aircraft (NOTE: perform MAP
adjustment prior to this process) Follow the steps below:
1. Prior to takeoff, with the engine running, enter Pilot Program Mode
(hold STEP and LF until ‘PROGRAM’ is displayed).
2. Tap STEP until you see HP ADJUST. Hold both STEP and LF
until you see HPC=108 (your value may be different). Try changing
the constant by tapping/holding the LF button. Note that the %HP
gauge value changes as you change the constant. This adjustment
will be performed while airborne.
3. Once airborne, by reference to the Aircraft Flight Manual (AFM),
not the EDM , setup a constant power setting of 70% in straight and
level flight below 10,000 feet (be sure your mixture is Rich of Peak).
If necessary, re-enter the HP constant mode (steps 1 & 2 above).
Adjust the HP constant until the EDM’s %HP is as close as possible
to 70%. Note: the reading is the percent of maximum HP, not
actual HP.
4. Tap the STEP button to save and exit.
Section 8 - Programming Manifold Pressure (MAP)
Do this one time and only if the MAP on your manifold pressure
gauge doesn't match the MAP shown on the EDM.
1. Do this on the ground with the engine turned off.
2. Enter the pilot program mode by simultaneously holding the STEP
and LF buttons for a few seconds.
3. Tap STEP to index to HP ADJUST.
4. Hold both the STEP and LF buttons and you will see HPC=108
(note: your value may differ from ‘108’) .
5. Hold both the STEP and LF buttons and you will see MAP 0.0 .
6. You will need to determine and set the absolute air pressure (this is
what MAP displays). Depending on your airport elevation, use either
method ‘A’ or ‘B’ below:
A. Airport at sea level: adjust the MAP gauge digital display to the
airport ATIS altimeter setting (or to your altimeter Kollsman