J.P. Instruments EDM 740 User Manual

Pilot’s Guide

Engine Data Management

EDM-730

EDM-830

EDM-740

EXPERIMENTAL

Copyright 2000-2010 J.P. Instruments, Inc.

All Rights Reserved

J.P. INSTRUMENTS INC.

Information: P. O. Box 7033

Huntington Beach, CA 92646

Factory: 3185 B Airway

Costa Mesa, CA 92626

PH: [phone] PH: [phone] FX: [phone]

www.jpinstruments.com www.jpitech.com [e-mail]

Printed in the United States of America	Rev C June 1 2010
Last printed 3/11/2011 8:44:00 AM
For Your Safe Flight	Page 1

Table of Contents

Section 1 -	Introduction	5
Product Features		5
Engine Data Management		6
Benefits of Proper Mixture Control		6
JPI Probes		6
Temperature and Mixture		6
Displays and Controls		8
Typical EDM-830-6C Cylinder Display		8

Typical display configurations by model and mounting orientation 12

EDM-830 RPM and MAP Display		13
EDM-730/830 Linear Gauges		13
EDM-730/830 Basic Scanner® Operation		14
Operating Modes		15
Button Location and Display Rotation		16
Scanner® Information Area		19
Section 2 -	Operating Procedures	20
Built-in Diagnostics: Startup and During Flight		20
EDM Modes		20
Automatic Mode		20
Manual Mode		21
LeanFind Mode		22
LeanFind Procedure—General Explanation		25
Expanded Leaning Procedures		28
Operation for each Phase of Flight		29
Shock Cooling		30
Common Misapplications		31
Section 3 -	Diagnosing Engine Problems	32
Engine Diagnosis Chart		33
Alarms		35
Alarm Priority		36
Pre-Ignition and Detonation		36
Section 4 -	Fuel Flow Option Operation	37
Fuel Management		37
Start Up Fuel		38
Resetting ‘USED’		42
Accumulate — Trip Totalizer		42
Fuel Flow Display Select Switch		42
Parameter Scan—Systems with Fuel Flow Option		42
Section 5 -	Long Term Data Memory	44
Downloading from Long Term Memory		44
Transferring from the USB Flash Drive to a PC		45

Page 2 Engine Data Management

Section 6 -	Personalizing	45
Pilot Programming		45
Section 7 - Programming Horsepower Constant		47
Section 8 - Programming Manifold Pressure (MAP)		47
Section 9 - Programming use of Factory Original TIT Probe		48
Section 10 - Programming the Fuel Flow Option		49
Section 11 - Programming Long Term Data Memory		51
Section 12 - Factory Limits and GPS		52
MAP, Fuel Flow Alarm Limits, Units, Fuel Capacity		55
Navigation GPS Data Formats		57
GPS-C Fuel Flow Format for GPS Bi-directional Comm		57
Navigation Data Ports for GPS Communication		58
Section 13 - Options Connector Pin Assignments		59
Section 14 -	Display Customization	60
Section 15 -	Reference Reading	61
Section 16 -	Technical Support	61
Section 17 -	Limited Warranty	62
Section 18 - EDM-851 TWIN ENGINE ADDENDUM		63
Section 19 -	Index	64
QUICK REFERENCE GUIDE		68

For Your Safe Flight

Page 3

The following is a quick reference of basic operation

		tap STEP button	tap STEP and LF
			simultaneously
	AUTO MODE:		MANUAL MODE:	Toggles to
				include/exclude
	parameters		Parameters
				parameter in
	automatically		manually indexed
				AUTO MODE
	indexed	tap LF, then tap STEP	by tapping STEP release buttons
				indexing

STEP

L F

LF

LEAN FIND: starts LeanFind procedure

			th				F
			o
		b				L		ly
				d
	ld		n					s
o			a				u
h		P				o
					e
	E			n
T			ta
			l
S		u
	im
s

Toggle between

LEAN R and

LEAN L of peak

b
l	e
	g
e		i
a		n
n
	i
	n
	g

	continue		hold LF
		see		Displays
	Cylinder I.D. leaning
		‘LeanFind
				peak EGT
	box flashes	Mode’ for
			release LF	value
		details

Page 4

Engine Data Management

Section 1 - Introduction

Product Features

 indicates standard feature	730	830
Hands-free, automatic scanning		
All programming done from the Front Panel		
LeanFind finds the first and last cylinder to peak with		
true peak detect—eliminates a false peaks
Displays both leaned temperature below peak and peak		
Battery voltage with alarm		
24 Programmable alarm limits		
Normalize view		
DIF low to high EGT with alarm		
EGTs to stable 1°F resolution		
Shock cooling monitored on every cylinder		
User selectable index rate		
Fast response probes		
Non-volatile long term memory		
Records and stores data up to 30 hours		
Post-flight data retrieval		
Data retrieval software		
Alarm and warning light outputs		
Oil temperature	opt	opt
Oil pressure	opt	opt
Turbine inlet temperature	opt	opt
Outside air temperature	opt	
Compressor discharge temperature	opt	opt
Intercooler temperature	opt	opt
Carburetor temperature	opt	opt
Manifold Pressure (MAP)		
Fuel Flow	FF opt	
Solid-state rotor fuel flow transducer	FF opt	
Fuel quantity in gallons, kilograms, liters, or pounds	FF opt	
Low fuel quantity alarm	FF opt	
Low fuel time alarm	FF opt	
GPS interface	FF opt	
Instantaneous fuel flow rate	FF opt	
Total amount of fuel consumed	FF opt	
Total fuel remaining	FF opt	
Time to empty at the current fuel flow rate	FF opt	
Displays % horsepower and RPM	RPM opt	
Automatically calculates percent horsepower		
Requires FF, OAT, RPM, and MAP.

For Your Safe Flight

Page 5

Engine Data Management

The EDM Engine Data Management system is the most advanced and accurate piston engine-monitoring instrument on the market. Using the latest microprocessor technology, the EDM will monitor up to twentyfour critical parameters in your engine, four times a second, with a linearized thermocouple accuracy of better than 0.1 percent or 2 F°.

As your built-in flight engineer, the EDM is constantly “red line” checking: all critical parameters are automatically checked four times a second, regardless of the current display status. Leaning is accomplished quickly and automatically using the LeanFind procedure. With the EDM, it is now possible to have substantially more diagnostic information available to you in a timely and usable manner.

Benefits of Proper Mixture Control

	Improved engine efficiency
	Greater fuel economy
	Smoother engine operation
Longer spark plug life

JPI Probes

Temperature information processed by the EDM is captured by fast response grounded JPI temperature probes that accurately measure small temperature changes—as small as 1°F—that routinely occur during mixture adjustment.

Reduced maintenance costs Reduced operating costs Proper engine temperatures Reduced engine vibration

	CHT probe
cylinder	exhaust
head	manifold
	EGT probe

Temperature and Mixture

In a piston engine only a small portion of the energy from combustion produces movement of the piston during the power stroke. The majority of energy passes into the exhaust pipe as hot gasses. By monitoring the temperature of these exhaust gasses you will have an indication of the quality of the combustion process. Low compression, non-uniform fuel distribution, faulty ignition, and clogged injectors diminish the efficiency of the combustion process that generates power. From the cockpit you can adjust the fuel/air ratio by a process called leaning. Retarding the mixture control changes the fuel/air ratio and hence affects the Exhaust Gas Temperature (EGT).

Page 6

Engine Data Management

The following depicts the power, mixture and temperature relationships.

peak		0
		-
below°FEGT		50
		-
	100
		10
best		0
		9
Percentof power		5
		8
		9

0

8

5

0

Best									Best
power								economy		Last cylinder to
range									range
										peak. Use for LOP
										Lean of Peak
										leaning

T		First cylinder to
G
E		peak. Use for ROP
		Rich of Peak
				leaning
	T
H
C

					t
				n
			e
	rc
e					r
P
				e
		w
	o
p

GAMI spread

20

0

-

20

-

40

-

60

-

80

CHT °F change from best power

Peak Power

		S
			p
	c			e
					c
	o					if
		n					i
			s				c		f
				u
					m				u
									e
						p				l
							t
								i
								o
									n
Full Rich	Rich								Lean		Too
(Take-off)
											lean

As the mixture is leaned, EGT rises to a peak temperature, and then drops as the mixture is further leaned. Peak power occurs at a mixture using more fuel than at peak EGT. Best economy occurs at peak EGT. Accurate leaning yields optimal engine temperatures. By being able to precisely adjust the mixture, your engine can produce either the best fuel economy or maximum power, whichever you choose.

A single EGT gauge merely gives you an average of a few cylinder’s temperature: some cylinders can be too rich, while others too lean. Variations produced by differences in fuel distribution, ignition, and compression will cause each cylinder to peak at a different temperature. In some cases the coldest cylinder will peak first. TIT will run up to 100 degrees hotter than the hottest EGT.

For Your Safe Flight

Page 7

Displays and Controls

The EDM monitors engine temperatures and voltages, assists in adjusting the fuel/air mixture, and helps diagnose engine malfunctions. There are three components of the user interface:

Analog display including cylinder number and cylinder I.D. box

Digital display for numeric readouts and messages

Two front panel operating buttons for simple operation.

Typical EDM-830-6C Cylinder Display

1 EGT normalize

6 %HP

5 Cyl Bargraphs: EGT left side, CHT right side, digital above

		9	Linear gauges
4	CHT		monitor
			numerous
	absolute
			parameters
	scale

2Temp in °F or °C

3 Cyl Number identifies	7 Scanner	8	TIT
bargraph cylinder.	Information		Bargraph
Cyl I.D. Box identifies	Area
the related Scanner
digital values

Display Dimming

The display features automatic dimming. Allow ten seconds for the display to adjust to ambient lighting conditions. The dimming baseline can be user adjusted in Pilot Programming Mode.

Page 8

Engine Data Management

The following is a description of various display areas. Numbers in circles refer to features in the above diagram.

1Normalize View and Percentage View

Percentage View: when the EGT normalize indicator ‘NRM’ is not lit, the columns indicate percent of EGT red line. Each column is composed of a stack of segments. A maximum height column (all segments lit) depicts 100 %, or more, of red line and a one segment-high column depicts 50 % of red line. For example, if the red line is 1650°F, a maximum height column represents 1650°F and a one segment-high column represents half that value, or 825°F. The Percentage View permits comparison of EGTs across all cylinders. Hotter cylinders display higher columns than cooler cylinders.

Normalize View: when the EGT normalize indicator ‘NRM’ is lit, the EGT columns are displayed normalized. When you activate Normalize View, all column peaks are set to the same half-height level for trend analysis. Any changes are shown as an increase or decrease in column height. A one-segment change in column height represents a 10°F change. The Normalize view permits rapid visualization of EGT trends, rather than a percentage of red line. You should use normalize in level cruise and run-up.

To toggle between Percentage View and Normalize View, hold the LF button until the ‘NRM’ indicator either comes on or goes off.

Selecting the Normalize view does not affect the digital display nor alter the parameter sequence. The CHT display—described later—is not affected by either Normalize or Percentage view.

You may select the Normalize view in either the Manual or Automatic modes, but not during Lean Find mode. Normalize view is most helpful for engine trend monitoring of each cylinder’s operation. For example using the Normalize view during engine run-up, a fouled spark plug will appear as a higher column.

TIP: A common misapplication is to be in the Normalize view and then change your power setting. This can cause all columns to go off scale, high or low, giving you the impression there is a problem. Turn off ‘NRM’ (return to Percentage view) before adding or reducing power and when beginning your descent.

For Your Safe Flight

Page 9

2 Temperature Units (°F or °C)

The EDM series engine temps can be set for either degrees Fahrenheit °F or degrees Celsius °C. Note: OAT units can be set independently of the engine temps. To change the display of engine temperatures see

“Changing the Alarm Limits” on page 52.

3 Cylinder Numbers and the Cylinder I.D. box

The row of numbers 1 through 6 (cylinder I.D numbers) and the letter ‘T’ (optional turbine inlet temp) are the column labels for the analog display bargraphs. A square box (cylinder I.D. box), surrounding one or more of the labels, specifies that those particular cylinders relate to the values currently shown in the Scanner® information area.

4 CHT absolute scale

The ‘CHT absolute scale’ allows you to quickly determine the absolute temperature of any CHT by comparing the bargraph height to the scale. This is a quick and useful way to visually determine your CHT temperatures relative to redline.

5 Bar Graph EGT and CHT

A cylinder ‘bargraph set’ is composed of a dotted line leading from the cylinder I.D. number vertically to its EGT/CHT digital values. The EGT column is located to the left of the line and the CHT column to the right. Columns are composed of a stack of segments. The maximum height for a column is the top of the dotted line. The CHT redline value is depicted by a horizontal red line approximately half way up and to the right of the dotted line. When any CHT column reaches redline, its column will turn red and an alarm message will commence. The CHT display is not affected by mode or view. The EGT column has three different viewing modes: Percent View, Normalize View and Lean Find.

6 Percent HP (EDM-830 only)

Displays %HP (if FF, RPM, OAT, MAP functional).

7 Scanner® Information Area

The Scanner® Information Area provides expanded information for the various monitored parameters. The Scanner® operates automatically or manually.

Page 10 Engine Data Management

8 TIT Bargraph

The EDM provides a bargraph display of the hottest TIT and continuously checks for exceedance of the redline temp. Once redline is reached, the bargraph will change to red and an alert will flash in the Scanner® Information Area.

9 Linear Gauges

The Linear gauges provide both digital and analog indications for various parameters. The sliding pointer and color range marks give you a quick indication of where you are relative to the operating limits while the digital value provides precise information. See Section 14 - Display Customization for ways you can customize this area. Note: parameters monitored vary by model and options present.

EGT and CHT operation in Scanner® Information Area

When the Cylinder I.D. Box highlights a cylinder number (1 through 6), the Scanner® Information Area will show the EGT value on the left (four digits) and the CHT value on the right (three digits). Other parameters are displayed in the digital display as described in the subsection “Scanner® Information Area” on page 19.

Cylinder # 1	4 digit	3 digit
highlighted	display of	display of
	EGT 1	CHT 1

For Your Safe Flight

Page 11

Typical display configurations by model and mounting orientation

The EDM-730/830 series features the ability to be mounted either in landscape or portrait orientation. Display layouts will differ as a result of configuration differences. You may examples of the EDM-830 and EDM-730 are shown below:

EDM-830 6 Cylinder (landscape orientation)

EDM-830 6 Cylinder

(portrait orientation)

EDM-730 6 Cylinder

(portrait orientation)

Page 12

Engine Data Management

EDM-830 RPM and MAP Display

The EDM-830 depicts both RPM and Manifold Pressure graphically and digitally. Examples are shown for both landscape and portrait orientation. When a power setting exceeds redline, the digital value changes to red and a blinking message appears in the Scanner® Information Area. Percent horsepower is located in this display area also.

EDM-830 RPM & MAP (portrait orientation)

EDM-730/830 Linear Gauges

This area contains linear bar graphs with digital displays. When a value exceeds red line, it is displayed in RED. You can customize what appears in each position. Examples of available displays are:

Voltage (BAT)

EGT Span (DIF)

Shock Cooling (CLD)

Oil temperature (O-T)

Oil pressure (O-P)

Outside Air Temperature (OAT)

Fuel flow, units per hour (GPH)

Fuel Used (USD)

Fuel Remaining (REM)

Fuel Required to waypoint or destination (REQ)

EDM-830 RPM & MAP (landscape orientation)

EDM-830

Linear Gauge

For Your Safe Flight

Page 13

EDM-730/830 Basic Scanner® Operation

The EDM-730/830 Scanner section contains graphic representation of EGT, CHT and TIT values as well as containing a general purpose text message area. It will go into Automatic scan mode a few minutes after power up. You don’t have to touch any buttons.

CHT redline

CHT absolute scale

Engine temps in F or C

Cylinder numbers 1 through 6. T is TIT

Digital EGT/CHT/TIT

values

Cylinder I.D. box indicates which cylinder temperatures are show in the digital display

TIT redline

Scanner Information Area

EGT: Exhaust Gas Temperatures

Blue segments represent temperature magnitude and are located to the left of the vertical dotted line present in each cylinder bar graph. Cylinder I.D. numbers are located just below the dotted line (one for each cylinder on the engine). A white square around a cylinder I.D. number identifies which cylinder the Scanner® digital value relates to (cylinder 3 in the above example). The digital value is always present above the dotted line and is Blue.

CHT: Cylinder Head Temperatures

White segments represent temperature magnitude and are located to the right of the vertical dotted line present in each cylinder bar graph. Cylinder I.D. numbers are located just below the dotted line (one for each cylinder on the engine). A white square around a cylinder I.D. number identifies which cylinder the Scanner® digital value relates to (cylinder 3 in the above example). The digital value is always present above the dotted line and is White. CHT redline is depicted by red horizontal lines half way up the bar graph scale.

Page 14

Engine Data Management

TIT: Turbine Inlet Temperature

Light Blue segments represent temperature magnitude (at the same scale as EGT) and are located to the right of the last cylinder bar graph set. A ‘T’ just below the dotted line identifies this as TIT. When a white square surrounds the ‘T’, this signifies that the scanner digital values relate to TIT. The digital value is always present above the dotted line and is Light Blue. TIT redline is depicted by a red horizontal line above the majority of the TIT bar graph area.

There are two views: Normalize view levels the EGT columns and increases the sensitivity of the Scanner® bar graph columns. To enter the Normalize view, hold the LeanFind button for three seconds. The NRM icon will be displayed above the Scanner® section and the bars will be blue. Hold the LeanFind button for three seconds to return to the Standard view. See page 9 for a more detailed description.

Operating Modes

There are three standard operating modes of the EDM: Automatic, Manual, and LeanFind. These modes will be described in more detail beginning on page 20. When you first turn on the power the EDM starts in the Manual mode, but will enter the Automatic mode after two minutes (most of the time you will operate the EDM in the Automatic mode). The three modes primarily affect the Scanner® Information Area.

Automatic Mode

Just tap the LF button, then tap the STEP button. No user intervention is required to use this mode. Each cylinder and each parameter value is automatically sequenced and shown in the digital display for a few seconds.

Manual Mode

Just tap the STEP button. This stops Automatic Mode. Each indexed parameter is frozen in the digital display until you manually index to the next parameter by tapping the STEP button.

LeanFind Mode

Simply pre-lean, tap the LF button and begin leaning. The EDM will assist you in finding the correct cylinder to peak to set your mixture to.

For Your Safe Flight

Page 15

Button Location and Display Rotation

The EDM can be mounted in four different positions. After mounting, you may need to remove and relocate the white button to the ‘STEP’ location. You may also need to rotate the EDM display. Clear any alarms and hold STEP (about 6 seconds) until you see the overlayed arrow. This arrow indicates where the top of the display will be. Tap LF until the arrow points to 12 o’clock. Now tap STEP. Your display should now be upright. The button functions are depicted in the four possible orientations as shown below:

Page 16

Engine Data Management

The STEP and LF buttons control all functions of the EDM. The term tap denotes pressing a button momentarily. The term hold denotes pressing and holding a button for five seconds or longer.

STEP Button - Primary functions

In the Automatic mode, tapping the STEP button will change to the Manual mode. Subsequent taps of the STEP button will display the next parameters in the sequence.

In the LeanFind mode tapping the STEP button will terminate the LeanFind mode and change to the Automatic mode.

STEP Button - Secondary functions

In the Manual mode, holding the STEP button will display the previous parameters in the sequence (rapidly backwards).

In the Pilot Program Mode, tapping the STEP button will generally advance to the next item in the list.

When an alarm is displayed, tapping the STEP button will prevent that alarm from appearing for the next ten minutes.

When an alarm is displayed, holding the STEP button until the word OFF appears, prevents that alarm from appearing for the remainder of the flight.

LF Button - Primary functions

In Automatic or Manual modes, tapping the LF button will change to the LeanFind mode.

In the LeanFind mode, holding the LF button after peak EGT is found will display peak EGT.

In Automatic or Manual modes, holding the LF button for three seconds will toggle between Percentage and Normalize views.

	EGT Percentage view	hold LF button	EGT Normalize View
	is ON.		is ON.
		for 3 seconds
	(NRM icon off)		(NRM icon on)

For Your Safe Flight

Page 17

LF Button - Secondary functions

In the pilot programming procedure, holding or tapping the LF button is used to increment or decrement parameter values and toggle between Yes and No answers to questions.

STEP and LF buttons together

Holding both the STEP and LF buttons simultaneously, for several seconds, changes to the Pilot Programming Mode.

Holding both the STEP and LF buttons simultaneously for several seconds when in a unit programming mode and ‘END? Y’ is displayed will take you to the next programming mode (if one exists).

Holding both the STEP and LF buttons simultaneously for several seconds after entering LeanFind mode but before beginning to lean will toggle between leaning ‘Rich Of Peak’ and ‘Lean Of Peak’.

Tapping both the STEP and LF buttons simultaneously in Manual mode toggles to include or exclude the displayed parameter from the Automatic mode. It has no affect on the displayed parameters in the Manual mode.

Page 18

Engine Data Management

Scanner® Information Area

The Scanner® Information Area provides expanded information in the form of alpha-numeric messages, parameters and calculations. In AutoScan, parameters will ‘scan by’ once every 4 seconds (default). This rate can be changed in Pilot Programming Mode. Tap the STEP button for ‘Manual’ selection of any parameter. Parameters for the installed options will be displayed - uninstalled parameters will not appear.

	DISPLAY	PARAMETER	DESCRIPTION
	EGT 1436 CHT 382	EGT/CHT	Shows successive pairs of
			EGT & CHT per STEP tap.
	1580 TIT	TIT 1	Turbine Inlet Temp #1
	1490 TI2	TIT 2	Turbine Inlet Temp #2
	204 OIL-T	OIL TEMP	Oil temperature
	64 OIL-P	OIL PRES	Oil pressure
	75 CLD	SHOCK COOL	CHT cooling rate (deg/min)
	13.9 BAT	BATTERY	Battery/Bus voltage
	23 OAT	OAT	Outside air temperature
	40 DIF	DIF	Hottest minus coldest EGT
	56 CRB	CRB	Carburetor Air Temp (only
			allowed if IAT not present)
	145 CDT	CDT	Compressor Discharge Temp
			(only allowed if CRB not
			present)
	105 IAT	IAT	Intercooler Air Temp
	-40 C-I	CDT-IAT	Intercooler cooling
	RPM 2460 MAP 23.6	POWER	RPM & MAP values
	Calculated	REM	Calculated fuel remaining
	68.0 REM
	12.7 REQ	FUEL	Calculated fuel required to
		REQUIRED	reach waypoint (GPS interface
			must be correct)
	Calculated	FUEL	Calculated fuel reserve at
	55.2 RES	RESERVE	waypoint (GPS interface must
			be correct)
	9.8 MPG	MILES PER	Calculated fuel miles per units
		GALLON	(GPS interface must be
			correct)
	Calculated	ENDURANCE	Calculated time remaining to
	04:32 H:M		fuel exhaustion
	15.0 GPH	FUEL FLOW	Calculated fuel flow rate in
		RATE	units per hour
	7.2 USD	FUEL USED	Calculated fuel used
For Your Safe Flight			Page 19

Section 2 - Operating Procedures

Built-in Diagnostics: Startup and During Flight

When your EDM is first turned on, the screen begins by showing the unit model number and TSO category. Next, several display patterns are presented allowing you to check for proper screen operation. During this time, the EDM is conducting built-in-tests of certain components, calibration and probes. Any newly installed options are found and logged in at this time. If a probe problem is found, diagnostic indications will be presented on the display. These vary depending on the parameter. For CHT, EGT and TIT, a message appears in the Scanner® Information Area. For example, if EGT#2 were open circuit, the message would read ‘OPEN EGT 2’. For an inoperative horizontal linear gauge function, a red ‘X’ is drawn through it and its digital value is dashed out. Probes determined to be faulty during the power up checks are disabled from the Scanner® automatic sequence. During flight, probes are periodically checked for inconsistent or intermittent signals and are disabled if deemed unusable in which case an appropriate message will appear.

EDM Modes

The EDM has three different operating modes: Automatic, Manual and LeanFind. When you first turn on the power the EDM starts in the Manual mode, but will enter the Automatic mode after a few minutes. The Automatic mode provides you with engine monitoring information for the majority of flight conditions. To adjust the mixture, use the LeanFind mode. To display specific parameters, use the Manual mode. In either Automatic or Manual modes, the cylinder bar graphs show a graphic representation of EGT and CHT for each cylinder and TIT (if present).

Automatic Mode

Just tap the LF button, then tap the STEP button. No other user intervention is required to use this mode. The EDM will begin displaying the parameter sequence at the programmed ‘RATE’ (see “Personalizing” on page 45).

Page 20

Engine Data Management

Individual parameters can be excluded from the Automatic mode: tap STEP to enter the Manual mode. Tap STEP to select the parameter you want to exclude. Now tap both STEP and LF buttons simultaneously. Note that tapping the STEP and LF buttons again, toggles back to include status.

An excluded parameter displays a decimal point before the parameter name.

For example:	‘Excluded’ marker
Included: 14.6 BAT	Excluded: 14.6			.BAT

Every time you turn on the EDM, all parameters are set to ‘included’.

All installed parameters are always displayed in the Manual mode. Exclusion only applies to the Automatic mode.

All parameters are checked periodically for alarm conditions regardless of their included or excluded status.

OIL temperature, EGT, CHT and TIT values cannot be excluded.

Manual Mode

Just tap the STEP button. Use the Manual mode when you want to monitor one specific parameter such as shock cooling during descent, or a particular cylinder temperature during climbs. To change to the Manual mode, tap the STEP button once. Subsequent taps will index the digital display through the parameter sequence (see “Scanner® Information Area” on page 19). To exit the Manual mode and return to the Automatic mode, tap the LF button and then tap the STEP button. You may disable the Automatic mode by setting scan rate to ‘0’.

For Your Safe Flight

Page 21

LeanFind Mode

The EDM supports two methods of leaning; Rich Of Peak (ROP) and Lean Of Peak (LOP). Note: you can set the power-up default to LOP or ROP in the Pilot Program Mode but easily change modes during flight. During traditional Rich Of Peak leaning, you’ll finalize the mixture to about 20 to 80° rich of peak (depending on engine operating requirements). However, with the advent of closely balanced injectors (such as GAMI), it is possible to set the mixture lean of peak—thus saving fuel and running the engine cooler. Teledyne Continental recommends lean of peak for the Malibu. Both Rich Of Peak and Lean Of Peak processes are described in detail in this manual.

Upon reaching cruise configuration, use the LeanFind mode to identify the correct cylinder to reach peak EGT (for rich of peak this is the FIRST to peak, for lean of peak this is the LAST to peak). To change from one method to the other, just after activating LeanFind, hold STEP and LF and the other method will be momentarily shown: ROP or LOP. Release buttons after other method appears.

The following charts provide step by step guidelines in leaning your engine, for both rich of peak and lean of peak modes:

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Engine Data Management