FAA Approved Installation Manual for the EDM-711 Primary Page 7of 23
Report No. 106P Rev. B
Date: 8-02-01
Secure thermocouple wires along the route to the indicator. Secure wire using original clamps, tape or tie wrap if
possible.
CAUTION: Be sure the controls under the panel are not obstructed by the wiring.
•The probe wires must not be tied in with ignition, alternator or engine cabin heater ignition wires because of potential
interference with temperature readings.
•The probe wiring harness is made of Chromel-Alumel alloy wire that must not be substituted or extended with
normal copper wire. The power and ground wire are normal copper. Leads may be spliced with additional Chromel-
Alumel wire using copper butt splices.
•When the installation is complete all wires should be secured using ties and carefully checked for interference,
rubbing or chaffing with flight control cables or other moving parts.
19. DESCRIPTION/OPERATING INSTRUCTIONS
The EDM-711 temperature indicator displays temperature digitally and in analog format. The EGT as displayed is
based on probes located near the exhaust outlet for each cylinder and the TIT probe, if installed, is adjacent to the turbo
charger. Primary CHT, OIL and TIT probes are in the same location as the original aircraft’s factory location.
The analog display is an electronic bar graph (vertical columns, one per cylinder) of EGT, OIL, & TIT temperatures
presented as a percentage of maximum EGT or TIT (1650 F). Below the vertical columns the specific value for EGT and
CHT are displayed digitally, flashing in the specific location, EGT-CHT every few seconds. A scale of CHT from 300 F to
580 F appears on the left side of the window. The dot over the column indicates which cylinder's digital information is
presently displayed. The missing bars at the base of the columns indicate CHT from 300 to 500 degrees F with 25
degrees per bar. OIL temperature and TIT are similarly displayed in the right hand column as a percentage of the Limit.
The Oil temperature is displayed as the missing bar in the TIT column when the TIT is installed (“T” over column) and as
the column when the TIT is not present and the “T” is missing.
Engine Temperature Limit and warning remote lights. Each Primary function has a remote Limit light (red) and caution
light (yellow). Any primary alarm causes the digital function (acronym CHT, OIL, and /or TIT) to flash and a remote yellow
‘Caution” light or red “Limit” light to illuminate .
Depressing the LF and STEP button simultaneously brings up the program mode to place the OAT in oF or oC , EGT in 1
or 10 degrees for EGT and K-factor questions. Depressing the LF button will change Oat in oC or oF. Exit by depressing
STEP. If either the STEP or LF buttons are not pushed for three minutes the EDM-711 will revert to auto-scanning of the
primary functions CHT, OIL, and TIT. Depressing the STEP button will stop the automatic scan and revert to manual
scan. Each function is displayed in order, for each push of the STEP button. Holding the STEP button down causes the
functions to index in the reverse order.
During constant power cruise, if the LF button is depressed for five seconds the Bargraph will level at mid scale. The
leveled bars represent the peaks of each EGT column. Each bar represents 10 oF and now acts as an EGT & TIT trend
monitor, quickly showing an increase or decrease in temperature. Depress again to return to normal; nothing else is
affected. With the fuel flow option there is a three position toggle switch. The positions are: 1) EGT, digital and Bargraph
display of temperatures, 2) FF, digital display of GPH, REM and USED Fuel. Temperature Bargraph remains. 3) Both,
cycles through everything installed. The Data memory module will store 25 hrs of flight, recording every 6 seconds.
Options of Fuel Flow, OAT, IAT (induction air temp.), BAT (voltage) are only displayed digitally with acronyms after the
number, as "140 IAT" or “14 GPH”. A large value (50 +) of "CLD" indicates shock cooling usually associated with rapid
descents at low power. Optional functions not installed will not be displayed. RPM is displayed constantly in the top
display. Manifold pressure is displayed in the scan sequence.
Primary Alarm Limits:
The Primary orange acronyms are programmed to flash at a specific temperature below the programmed limit before
reaching the actual limit, that is Oil 20 F, CHT 40 F and TIT 50 F before the Actual Factory Limit. In this way, only primary
functions trigger the alarm lights, but all primary functions provide a cautionary range by flashing the parameter acronyms
early. The flashing secondary acronyms direct the pilot’s attention to the aircraft’s primary instruments for verification.
Factory set primary alarm limits for CHT, OIL and TIT (if installed) are the same as the actual aircraft limits and cannot be
set by the pilot. The caution and limit lights can only be extinguished by changing power and/or airspeed to reduce the
temperatures below the caution or limit trigger points. Tapping the STEP button will stop the display from flashing but will
not extinguish the yellow or red lights.
Advisory Alarm Limits:
Exhaust Gas Temperature (EGT), Outside Air Temperature “OAT”, Carburetor Air Temperature “CRB”, Bus Voltage
“BAT”, Shock Cooling “CLD”, and fuel flow functions “GPH”, “REQ”, “RES”, “MPG”, “H.M.”, and “USD” appear as orange
