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Table of Contents
C7076A
APPLICATION
The C7076 Adjustable Sensitivity Ultraviolet Flame Detector is
a solid-state, adjustable sensitivity, device for sensing the
ultraviolet radiation emanating from gas, oil and pulverized
coal flames. It is designed for burner management and flame
safety systems which require optimum sensitivity and/or flame
discrimination.
® U.S. Registered Trademark
Copyright © 2002 Honeywell • All Rights Reserved
Adjustable Sensitivity
Ultraviolet Flame Detectors
The C7076A and C7076D are identical except for their
housings. The C7076A is designed for standard installations
The explosion-proof housing used with the C7076D meets the
requirements for Division I, Class I, Groups C and D; and
Class II, Groups E, F, and G of the National Electrical Code
(NFPA70).
The C7076 features two sensitivity adjustments, each with a
400:1 dynamic range, and an integral flame signal meter jack
to facilitate precise sighting.
The flame detector is designed for use with Dynamic
Self-Check Ultraviolet Amplifiers R7476A and R7886 to
provide a closed-loop, self-checking circuit which insures the
integrity of both amplifier and flame detector. Improper
response to simulated flame loss results in a safety shutdown
and/or alarm.
FEATURES
• High level output permits long distance transmission
C7076D
• Solid state circuitry assures long life and stable
• Available in two versions:
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Wiring ...............................................................................
Troubleshooting ................................................................ 16
Service ............................................................................. 18
without special wiring.
sensitivity over wide ranges of temperature and
voltage.
— C7076A for use in standard installations.
— C7076D for use in installations requiring
explosion-proof packaging.
C7076A,D
PRODUCT DATA
Contents
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Summary of Contents for Honeywell C7076D
- Page 1 Adjustable Sensitivity Ultraviolet Flame Detectors PRODUCT DATA The C7076A and C7076D are identical except for their housings. The C7076A is designed for standard installations The explosion-proof housing used with the C7076D meets the requirements for Division I, Class I, Groups C and D; and Class II, Groups E, F, and G of the National Electrical Code (NFPA70).
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Page 2: Specifications
Honeywell, 1885 Douglas Drive North Minneapolis, Minnesota 55422-4386 In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A. - Page 3 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS Interchangeability: C7076D: Detector has 1-in. NPT tapping for mounting onto Models C7076A and C7076D are not interchangeable with sight pipe and two 5/16-18 UNC tapped holes for attaching other flame detector models; they must be used with either a bracket for additional security.
- Page 4 EITHER DIRECTION FROM HORIZONTAL DETECTOR CANNOT BE ROTATED IN THIS PLANE. M20748 C7076D Fig. 1. C7076 allowable mounting positions. INSTALLATION For the C7076A, to keep the detector temperature within specifications, the aspirator temperature must not exceed 225°F (107°C). If the aspirator temperature will exceed...
- Page 5 7-13/16 (198) 1-27/32 5-25/32 (147) 1-31/32 (50) (47) 11-13/16 (300) 3-15/16 (100) C7076D M20749A Fig. 2. C7076 dimensions in in. (mm). 1. Ultraviolet sources: e. High voltage condensers. a. Radiant surfaces above 2200°F (1200°C). Radioisotopes. b. Sparks from ignition transformers and welding arcs.
- Page 6 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS • the surface represents a significant percentage of the reaching the detector and may cause flame signal detector field of view. deterioration resulting in a shutdown. The adverse affects of If the temperature or a radiant surface causes the flame relay screening may be minimized by proper burner adjustment, (in the flame safeguard control) to pull in, re-aim the sight pipe increasing the detector viewing area (shorten sight pipe...
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Page 7: Installation
The aspirator on the faceplate of the C7076A, and the Two C7076 detectors connected to two flame signal amplifiers faceplate on the C7076D, are tapped for a 1-inch NPT wired in parallel comprise a redundant flame detection threaded pipe. A larger pipe may be necessary to obtain system. -
Page 8: Wiring
C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS faceplate on the C7076D Detector. Insert the other end of the Seal off of the sight pipe prevents hot gases from escaping pipe into the mounting hole, align it to the desired sighting from a positive pressure combustion chamber when the angle, and tack weld it in position. - Page 9 USING A SWIVEL MOUNT (PART NO. 118367A) M20750 Fig. 5. Installing the sight pipe for the C7076A Detector. 1 INCH (25) THREADS FACEPLATE 1 INCH (25) SIGHT PIPE M20751 Fig. 6. Installing the sight pipe for the C7076D Detector. 95-8269—1...
- Page 10 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS TERMINAL BLOCK FLAME DETECTOR WIRES LUCK NUT FLEXIBLE CONDUIT WATER TIGHT CONDUIT FITTING M20752 Fig. 7. Connecting the watertight flexible conduit. POSITIVE CONBUSTION CHAMBER PRESSURE – PSIG M20754 Fig. 9. Minimum inlet pressure or airflow. MANUAL SHUTOFF VALVE (BALL VALVE) 10"...
- Page 11 SHUTTER NOT MORE THAN 18 INCHES IN LENGTH. M20756 SENSITIVITY SHUTTER Fig. 11. Mounting the C7076D Detector. SELECTOR SWITCH 3. Detector leadwires can be spliced for longer leadwire runs observing the following considerations: a. Make required splices in a junction box.
- Page 12 4. Reassemble the detector by performing step 1a or 1b above, as applicable, in the reverse order. Two C7076A or two C7076D Flame Detectors with the same voltage rating can be connected in parallel to the same terminals. To avoid exceeding the rating of the shutter control circuit, do not connect more than two detectors in parallel.
- Page 13 Flame Signal Readings angle will not provide a proper flame signal for both the The final sighting position of the C7076A or C7076D Detector pilot and main burner flames throughout the entire may be most readily determined by using a Honeywell W136 turndown range of the burner.
- Page 14 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS 6. Secure the swivel mount (if used), or tack weld the sight d. Relight the burner and note the flame signal pipe. Do not weld the sight pipe permanently into place reading. The difference between the new reading until you have accomplished the spark hold-in and pilot and the initial reading in step a represents the turndown tests.
- Page 15 Shut down the chosen burner, then note the flame Make sure that the environment surrounding the signal reading. C7076D is free of all explosive or hazardous b. Gradually reduce the sensitivity by turning Control A conditions before exposing the interior of the detector...
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Page 16: Troubleshooting
Make sure that the environment surrounding the for the detector. C7076D Flame Detector is free of all explosive or hazardous conditions before exposing the interior of NOTE: Instructions for replacing the viewing lens, sensing... - Page 17 117, 120, 200, 220, 99.5 Troubleshooting Procedures for C7076A and 240 or 220/240 C7076D Flame Detectors. (1) If the proper voltage is present, replace the coil and shutter assembly or the entire plug-in electronics chassis (see Service section). NOTE: If the detector develops a signal at the Flame Current (2) If the measured voltage is not within the proper jack, skip troubleshooting Procedure A.
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Page 18: Service
Make sure that the environment surrounding the 6. Insert the four standoffs that hold the chassis and C7076D Flame Detector is free of all explosive or tighten them securely. hazardous conditions before exposing the interior of 7. Close the master switch and perform the Adjustments the detector to the atmosphere during the and Checkout. - Page 19 NOTE: Removing and replacing the plug-in electronics 1. Open the master switch and remove the plug-in chassis in the C7076D is identical to the procedure electronics chassis as specified in Replacing the Plug-in for the C7076A, above, with the exception of steps 2, Electronics Chassis, above.
- Page 20 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS PLUG-IN ELECTRONICS ALIGNMENT GUIDE CHASSIS 191053 TAB ON ULTRAVIOLET TUBE BRACKET SENSING TUBE TUBE SOCKET OCTAL PLUG M20764 Fig. 19. Replacing the ultraviolet sensing tube. REPLACING THE COIL AND SHUTTER ASSEMBLY 9. Slide the new coil and shutter assembly into place. Make sure its part number and voltage rating are 1.
- Page 21 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS TRANSFORMER ALIGNMENT COIL GUIDE OCTAL PLUG MOUNTING SCREW SHUTTER BASE OF 120625B, C, OR D COIL AND SENSING TUBE SHUTTER ASSMBLY (CHECK VOLTAGE RATING–100 OR 120) M20765 Fig. 20. Location of the coil and shutter assembly. MOUNTING BASE OF 120625B, C, OR D SCREWS...
- Page 22 10. Put the cover plate back on and tighten the four screws securely. Replacing the Lens in the C7076D Flame Detector 11. Repeat steps 4 through 10 for the rear cover plate. 1. Open the master switch to interrupt all power to the 12.
- Page 23 95-8269—1...
- Page 24 Automation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 Printed in U.S.A. on recycled 95-8269—1 G.R. Rev. 09-02 www.honeywell.com paper containing at least 10% post-consumer paper fibers.