Single and Multi-Channel 0906941 EGT, CHT, Carb Temp and OAT Instruments Operating and Installation Instructions OII 0906941 9/6/94 You must read this manual before installing or operating the instrument. This manual contains warranty and other information that may affect your decision to install this product and/or the safety of your aircraft.
Important Installation Information F All steps must be read before installing a probe. E 0720921 1. Leave slack in the cable to allow for engine movement and vibration. 2. Do Not Overtighten. Over time, tight wire wraps will cause the wire to break. S.S. Washer. Hose Clamp. 3. Both clip rings must be on the inside of the hose clamp. The rubber band is used to hold the washer on during shipping. Male Conn. 4. The tab inside the male connector must be centered (not bent up or down) to mate properly.
Important Notice ***** MUST READ ***** If you think it is not important to read this manual, you're wrong! This manual contains important installation information that may affect the safety of your aircraft, delay your installation or affect the operation of your instrument. You Must read this manual prior to installing your instrument. Any deviation from these installation instructions is the sole responsibility of the installer/pilot and may render the STC invalid. Read the Warranty / Agreement.
Contents Warranty --------------------------------------------------------------------------- 2 Operating Instructions: ----------------------------------------------------------- 3 Features -----------------------------------------------------------------------------------------EGT's --------------------------------------------------------------------------------------------CHT's -------------------------------------------------------------------------------------------Carburetor Temperature -----------
Warranty / Agreement Electronics International Inc. warrants this instrument and system components to be free from defects in materials and workmanship for a period of one year from the user invoice date. Electronics International Inc. will repair or replace any item under the terms of this Warranty provided the item is returned to the factory prepaid. 1. This Warranty shall not apply to any product that has been repaired or altered by any person other than Electronics International Inc.
OPERATING INSTRUCTIONS Features 1. Instruments: The Electronics International line of single and multi-channel instruments offer the following features: A. Digital Display - The digital display allows you to read absolute temperatures at a glance. It does not require interpretation of dials or tic marks. In a short period of time you will be come familiar with the normal operating temperatures of your engine. Abnormal temperatures will be easy to spot.
Operating Instructions EGT's 2. Remote Switches: Instrument displaying EGT for channel #2. A remote switch may be connected to any channel on any Electronics International Instrument. This gives the instrument multi-channel capability. There are two types of remote switches available, single deck and double deck. If a single deck four channel remote switch (RS-4-1) is connected to the EGT channel on an EC-1, the instrument would be capable of measuring four EGT's and one CHT.
Operating Information EGT's you approach peak, the exhaust gas temperature will rise much slower until it starts to decrease. When this happens you have reached peak EGT. The 1`F resolution of the digital display will be invaluable in helping you precisely detect peak EGT. C. Finding The Cylinder That Peaks First: For most engines Step B (Precision Leaning) will result in a properly leaned engine. If you find this to be the case with your engine, this step will not be necessary.
Operating Information EGT's engines tend to operate smoother at 25F on the rich side of peak EGT. Fuel-injected engines will provide a more precise peak. Most engines normally operate within an EGT range of 1300F to 1600F at cruise power. Some engine manufacturers allow leaning to peak EGT at 75% power and below on their direct drive normally aspirated engines. For your engine, check the engine manufacturers recommended procedures. It is not recommended to lean to peak EGT above 75% power settings.
Operating Information CHT's It is not necessary to continually monitor the EGTs in order to detect a problem. Most problems worsen over a period of time and can be easily detected before they become a safety hazard by thoroughly checking the EGT readings at run-up and once or twice during a flight. CHT's 1. CHT Operation: The Cylinder Head Temperature (CHT) instrument helps the pilot protect his engine against the threat of excessive heat.
Operating Information Carburetor Temperature Continuous change in the CHT can also be a sign of trouble. Because of the large thermal mass of the engine, the CHTs change slowly after the initial climb. Any continuous change in one or all of the CHTs after this initial climb can be the sign of trouble. The rate and trend of this change can easily be detected with Electronics Internationals 1F resolution digital display.
The second valuable feature is the instrument's ability to detect small temperature changes (1F). This gives the pilot rate and trend information (in what direction and how fast the temperatures are changing) at a glance. This is valuable for detecting changing atmospheric conditions and avoiding thunderstorms and icing conditions. It can also help to find cooler flying conditions in warm weather. The third feature is the instrument's Ice Zone Warning Light.
Installation Instructions 2. CHT Probe Installation H. If this instrument is to replace an existing unit in the aircraft, it is the installer's responsibility to move or replace any existing instruments or components in accordance with FAA approved methods and procedures. The following Installation Instructions do not cover moving or the removal of any existing instruments or components. 2. CHT Probe Installation: A single CHT probe should be placed on the hottest cylinder.
Installation Instructions 5. OAT Probe Installation NOTE: A Carb Temp Probe should be connected to the precision channel on a CA-1, A-1 or EAC-1 unit. A three to four degree F error can occur in some instances if the Carburetor Probe is not connected to a precision channel. 5. OAT Probe Installation: Mount the OAT Probe in an appropriate location on the aircraft, using the hardware supplied. The OAT Probe is sensitive to air temperature changes.
Installation Instructions 6. Route the Extension Cables D) Strip each wire and double the wires over. These wires must be doubled over. E) Place a male connector on the red wire and a female connector on the yellow wire. Double crimp these connectors. A good crimp is very important. Poor crimps will cause jumpy readings and are the biggest source of problems. Red Slip-on Connector Double the wires. Male Connector Double Crimp Keep the tab straight.
Installation Instructions 7. Hook-Up Connecting Wires 7. Hook-Up Connecting Wires: Connect the red wire supplied in the kit to the 12 or 24 volt bus via a 1 amp fuse or circuit breaker (see the Wiring Diagram at the back of this manual). Connect the black wire supplied in the kit to ground. Connect the white/violet to the 12V bus (leave it open for a 24V system). Connect the white/gray wire to the 24V bus (connect to ground for a 12V system).
TROUBLESHOOTING SUGGESTIONS Because high reliability is designed into Electronics Internationals equipment, there is no reason to put up with poor operation. We have few problems with our probes, cables and units and installation is simple. Usually fixing a problem is just a matter of inspecting the installation at a few key points. Strategy: If you have more than one problem, FIX ONE PROBLEM AT A TIME. Trying to fix all of them at once can be confusing and misleading.
Troubleshooting Suggestions 3. Extension Cable Check Out A. Poor Connections: When plugging the probe into the extension cable it is possible to get the tab on the male connector to wedge between the red nylon and metal receptacle in the female connector. This connection may work for a few weeks or even months and then you will start to see jumpy readings. Disturbing the connection, without actually fixing it, may get it to work for a short time and then the problem will reappear.
SPECIFICATIONS and OPERATING FEATURES S0908941 Models: (Temperature Monitoring Instruments) E-1, C-1, A-1, CA-1, EAC-1, EAE-1, EC-1, EC-2, E-2, C-2, E-4, C-4, E-6 and C-6. Weight: E-1, C-1, A-1, CA-1, EAC-1, EAE-1, EC-1, EC-2, E-2 and C-2 - 7 oz. (unit only) E-4 and C-4 - 7.6 oz. (unit only) E-6 and C-6 - 8.3 oz. (unit only) 6' T.C. Cable - 2 oz. EGT or CHT Probe - 1.6 oz. Environmental: Meets TSO C43a Power Requirements: 7.5 to 30 Volts, 1/10 Amp.
Instrument Wiring Diagram All Instruments Instrument Back Panel Red Black Wht/Violet Wht/Gray Wht/Org Description: Power Lead Connects To: 12/24 Volt Bus. via 1 amp fuse. Ground Lead Ground 12V Back Light 12 Volt Bus (open for a 24V system). 24V Back Light 24 Volt Bus (Gnd for a 12V system). Controls Ice Zone Warning Light intensity Panel Light Rheostat (an open line will cause the light to be at full intensity). "Brown" Pair E-1 or C-1 Additional Connections To Temp. Probe.
Remote Switch Wiring Diagram RS-4-1, RS-4-2, RS-6-1 and RS-6-2 Remote Switch Back Panel "Wht/Violet and Wht/Gray" Pair To Instrument EGT or CHT Channel. (For a twin unit, to Instrument Left or Right Channel) "Brown" Pair To Cyl. #1. "Red Stripe" Pair To Cyl. #2. "Orange" Pair To Cyl. #3. "Yellow" Pair To Cyl. #4. "Green" Pair To Cyl. #5 (RS-6 only). "Blue" Pair To Cyl. #6 (RS-6 only) RS-4-2 and RS-6-2 Only From the back of the RS-6-2 and RS-4-2 there are two groups of the above wires.
Remote Switch Wiring Diagram RS-8-1 and RS-12-1 Remote Switch Back Panel "Wht/Orange" Pair To Instrument EGT or CHT Channel. "Solid Brown" Pair To Cyl. #1. "Solid Red" Pair To Cyl. #2. "Solid Orange" Pair "Solid Yellow" Pair "Solid Green" Pair To Cyl. #3. To Cyl. #4. To Cyl. #5. "Solid Blue" Pair To Cyl. #6. "Violet Stripe" Pair To Cyl #7. "Gray Stripe" Pair To Cyl #8. "Solid White" Pair To Cyl #9 (RS-12-1 only). "Solid Black" Pair To Cyl #10 (RS-12-1 only).
