J.P. Instruments EDM 760 Instrument Installation Manual - Manual (Page 6)

Installation manual for the EDM-760 Twin STC SA00729SE
Report No. 760
Temperature indicating system with Fuel Flow Date 7/20/99 Rev NC
Page 6 of 19
EDM-760-6CT
With the fuel flow option a three-position mode (toggle) switch is installed in the panel per drw. 760124. The mode positions
are: 1) EGT, digital and Bargraph display of temperatures, 2) FF., digital display of GPH, REM, REQ and fuel USED.
Temperature Bargraph remains. 3) Both, cycles through everything installed. The data port output, sends RS232 serial data
every 6 sec. A second alert output is available for the above functions that will sink 250-ma load. See drawing 760701 for
wiring details.
18) OPERATION
Airplane flight manual limitations based on primary instrument indication take precedence over those of the EDM-760.
CAUTION
Comply with manufacturer's Airplane/Rotor craft
Flight Manual leaning procedure.
Do not exceed applicable engine
or aircraft limitations.
After establishing desired cruise power depress the LF button to activate the Lean Find Mode. The pilot should start leaning
one engine. The EDM-760 is waiting to see which engine starts to increase in temperature, using that engine as the engine
being leaned. At this time the hottest cylinder is displayed, as a reference, along with fuel flow per hour. As the mixture is
leaned, a column on the EDM-760 will begin blinking, indicating the exhaust gas temperature for that cylinder has peaked.
Continue with the leaning procedure as recommended by the aircraft manufacturer while monitoring the primary engine
instruments and the EDM-760 display. Depressing the LF button while the column is flashing will show the peak digital EGT
value. Once the leaning procedure has been completed, depress the Step button briefly to exit the Lean Find Mode and enter
the Monitor Mode. If you have the fuel flow option installed, set the mode switch to FF to monitor fuel burned per hour, fuel
used, fuel remaining, and if the EDM-760 is connected to a GPS, fuel required to next way point is displayed. When the
EDM-760 is first turned on with the fuel flow option, it will ask if you have filled the tanks
(Tank size preset) or how much fuel was added. If no response to fuel question in 5 minutes, system will assume no fuel
added.
19) EDM-760 SPECIFICATIONS and LIMITATIONS
FACTORY LIMITS
EGT (Exhaust Gas Temp.,K ,Max. limit 2500
o F) 1650 o F
CHT (Cylinder Head Temp., J/K Max. limit 600 o F) 450 o F
TIT (Turbine Inlet Temperature, K, Max. limit 2500 o F) 1650 o F
TIT-2 (Turbine Inlet Temperature, K, Max. limit 2500 o F) 1650 o F
OIL (Oil temperature if not TIT-2, K, Max. limit 600 o F) (Hi/Lo) 230/90 o F
OAT (Outside Air Temp., K, Limit -40 to 300 o F)
CLD (Rate of change of CHT) -60 o /minute
DIF (Maximum EGT differential) 500 o F
BAT (Voltage, 0 to 40 volts.) 15.5/12.0 or 31.0/24.0 Hi/Lo
GPH (in Gal, lit, lbs, per hour) Fuel flow does not comply with TSO-C44
USD (Fuel Used) (999.9 gal. 9999 L/Lbs/Kg)
Low alert: fuel=10 gal.
REM (Remaining in Hours and minutes) Low alert: Time= 45 min
REQ (Required to dest., GPS format NMEA 183/Binary/Aviation.) No limit
Operate and lean the engine in accordance with the manufacturers' recommendations for different power settings. Lycoming
recommends running peak EGT only at 75% power or less. Continental recommends running peak EGT at 65% power or
less.