J.P. Instruments EDM 700/800/711 Pilots Guide - Manual (Page 18)

Page 14 Engine Data Management
Lycoming and Continental engines have established specific
restrictions on leaning that must be followed, such as
percentage of power, climb leaning, and TIT limits. Lycoming
recommends operation at peak EGT for power settings of
75% or lower, while Continental recommends operation at
peak EGT for power settings of 65% or lower. This guide is
not meant to supersede any specific recommendations of the
engine manufacturer or airframe manufacturer.
It is your responsibility to know your aircraft’s limitations.
Pre-lean the mixture to about 50° below peak. After pre-leaning, wait for
one minute for the temperatures to stabilize. Next, begin the leaning
process by tapping the LF button. This tells the EDM to begin looking
for a 15° rise in EGT for any cylinder. Begin leaning the mixture without
pausing. When a 15° rise occurs, eliminating false peaks, the LeanFind
mode becomes activated shown when the cylinder dot above the column
of the hottest cylinder begins flashing. The LeanFind mode is not
active until a cylinder dot is blinking.
With the Fuel Flow Option, instead of seeing the word LF in the
display, you will see numerical fuel flow rate during the leaning
process on the right side of the digital display, for example
I2.4.
This allows you to observe the EGT rise and at the same time
watch the fuel flow rate decrease.
To show the progress of the leaning process, the EDM selects the hottest
cylinder for reference in the digital display. In the example below, the
I360 is the current temperature of the hottest cylinder.
I360 LF
STEP EDM-700 LF
° F
1 2 3 4 5 6 T
N P
JPI
_
_
EGT
%
Limit
_ 300
400
500
CHT
TSO
number of
hottest cylinder
flashes when
EGT rises 15°
dot
indicates
hottest
cylinder
temperature
and "LF"
displayed
When LF is activated: