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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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95-8269—1
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Related Manuals for Honeywell C7076D1027/U
Summary of Contents for Honeywell C7076D1027/U
- Page 1 Contents Application ................ Features ................Specifications ..............Ordering Information ............Installation ................ Wiring ................Troubleshooting ..............16 Service ................18 ® U.S. Registered Trademark Copyright © 2002 Honeywell • All Rights Reserved 95-8269—1...
- Page 2 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 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS SIGHT PIPE ASPIRATOR ASPIRATOR DETECTOR MAY BE ROTATED 90 IN EITHER DIRECTION DETECTOR CANNOT BE FROM HORIZONTAL ROTATED IN THIS PLANE. THE ASPIRATOR MUST BE ON TOP. C7076A SIGHT PIPE DETECTOR MAY BE ROTATED 90 IN EITHER DIRECTION FROM HORIZONTAL DETECTOR CANNOT BE...
- Page 5 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS 2-1/4 1 INCH NPT (57) 1-1/16 (27) 2-1/4 (57) (102) 4 (102) 2-9/32 7-13/32 (188) (58) 4-25/32 (122) 10-1/4 (261) 3/4 (19) 29/32 (22) OPENING FOR 1/2-INCH CONDUIT 1 (25) 1-5/8 POWER SUPPLY. PROVIDE DISCONNECT (19) MEANS AND OVERLOAD PROTECTION AS REQUIRED.
- 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...
- Page 7 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS When Installing this Product… MULTIFUEL REQUIREMENTS Detectors supervising burners that alternately fire more than 1. Read these instructions carefully. Failure to follow them one fuel may require a different sensitivity level for each fuel. could damage the product or cause a hazardous For example, a higher sensitivity is required to reliably sense condition.
- Page 8 Fig. 10 shows a method of supplying a constant airflow to purge the sight pipe, while also providing enough pressure to NOTE: When installing a C7076A Detector, a Honeywell seal off the sight pipe when needed. 118367A Swivel Mount is recommended to facilitate sighting the flame properly.
- Page 9 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS ASPIRATOR 1 INCH (25) THREADS FACEPLATE 1 INCH (25) SIGHT PIPE 3/8 INCH (9) NPT THREADS DIRECT MOUNTING AIR SUPPLY ASPIRATOR SIGHT PIPE 1 INCH (25) LARGER CLOSE THAN REDUCER NIPPLE 1 INCH (25) DIAMETER FACEPLATE 3/8 INCH (9)
- 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 Make required splices in a junction box. b. Use moisture-resistant no. 14 wire suitable for at least 167°F (75°C). c. For High Temperature Installations, use Honeywell specification no. 32004766-003 or equivalent for the F leadwire. This wire is rated up to 480°F (250°C) 1 POWER SUPPLY.
- Page 12 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS EXTERNAL EXTERNAL SELECTOR SELECTOR SWITCH SWITCH MASTER MASTER SWITCH SWITCH (HOT) (HOT) SHUTTER SHUTTER SHUTTER SHUTTER C7076A1031 OR C7076D1043, 220/240 VAC, 50/60 HZ Q7800 Q7800 WIRING SUBBASE WIRING SUBBASE POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD POWER SUPPLY.
- Page 13 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. Test Meter connected to the Flame Current meter jack on the plug-in electronics chassis.
- 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 MIN position and flame discrimination cannot be Current jack. achieved, insert an orifice plate in the sight pipe. An a. Use a Honeywell W136A Test Meter with the orifice of the proper diameter will reduce the selector switch set at the SPL position. (If a W136A...
- Page 16 Equipment Required Control B. 2. Remove the six screws that secure the cover plate to 1. Voltmeter (Honeywell W136A or equivalent) with 0 to the rear of the detector to provide access to the Flame 300 volt ac scale. Current jack on the electronics chassis.
- Page 17 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS 4. After each step in the following procedures, realign the 4. Determine if the self-checking shutter is open by looking detector with the faceplate and check for a meter into the front of the detector through the pipe in the reading at the Flame Current jack on the detector (Fig.
- Page 18 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS 3. If the shutter is closed and the signal at the Flame IMPORTANT Current jack on the detector is 1 microampere or more, If the combustion chamber (C7076A Flame Detector) remove the ultraviolet sensing tube (see Service has a positive pressure, make sure the aspirator inlet section) and operate the detector.
- Page 19 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS ASPIRATOR HOUSING SLOT STANDOFF (4) PLUG-IN ELECTRONICS CHASSIS REAR COVER (CHECK VOLTAGE RATING) M20763A C7076D HAS SCREWS, NOT STANDOFFS. Fig. 18. Replacing the plug-in electronics chassis in the C7076 Flame Detector. REPLACING THE PLUG-IN ELECTRONICS CHASSIS IN THE C7076D 9.
- 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 COIL ALIGNMENT 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. BASE OF 120625B, C, OR D MOUNTING SCREWS...
- Page 22 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS REPLACING THE GASKET SEALS (C7076A DETECTOR ONLY) 3. Unlatch the detector and swing it away from the faceplate-aspirator. 1. Open the master switch to interrupt all power to the 4. Loosen the four captive screws in the front cover plate detector.
- 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 95-8269—1 G.R. Rev. 09-02 www.honeywell.com...