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C7076A,D Adjustable Sensitivity
Ultraviolet Flame Detectors
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.
C7076D
SIL
Capable
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
without special wiring.
• Solid state circuitry assures long life and stable
sensitivity over wide ranges of temperature and
voltage.
• Available in two versions:
- C7076A for use in standard installations.
- C7076D for use in installations requiring
explosion-proof packaging.
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Wiring ...............................................................................
Troubleshooting ................................................................ 16
Service ............................................................................. 18
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PRODUCT DATA
Contents
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Summary of Contents for Honeywell C7076A1007
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Page 1: Table Of Contents
C7076A,D 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). -
Page 2: Specifications
If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory). 2. Honeywell Customer Care... - Page 3 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS Interchangeability: C7076D: 17.6 lb (8 kg). Models C7076A and C7076D are not interchangeable with other flame detector models; they must be used with either Dimensions: See Fig. 2. the R7476A or R7886 Dynamic Self-Check Ultraviolet Amplifier.
- 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 If the temperature or a radiant surface causes the flame relay detector viewing area (shorten sight pipe (in the flame safeguard control) to pull in, re-aim the sight pipe and/or increase its diameter), and optimizing detector so the detector views a cooler area, or decreases the sensitivity.
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Page 7: Installation
NOTE: When installing a C7076A Detector, a Honeywell 3. Installer must be a trained, experienced flame safeguard 118367A Swivel Mount is recommended to facilitate service technician. -
Page 8: Wiring
C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS Installing the C7076A Detector Fig. 10 shows a method of supplying a constant airflow to purge the sight pipe, while also providing enough pressure to seal off the sight pipe when needed. Mounting the Aspirator Mounting the Faceplate The aspirator on the faceplate of the C7076A Detector screws directly onto the 1-inch NPT threaded pipe. - 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 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD specification no. 32004766-003 or equivalent for the PROTECTION AS REQUIRED.
- 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 reading. pipe. Do not weld the sight pipe permanently into place The difference between the new reading and the until you have accomplished the spark hold-in and pilot initial reading in step a represents the degree of turndown tests.
- Page 15 Current jack. ultraviolet radiation reaching the detector so that the a. Use a Honeywell W136A Test Meter with the selector sensitivity can be adjusted to effect flame switch set at the SPL position. (If a W136A is not discrimination.
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Page 16: Troubleshooting
Equipment Required provide access to wiring at the terminal block in detector. 1. Voltmeter (Honeywell W136A or equivalent) with 0 to 4. After each step in the following procedures, realign the 300 volt ac scale. - Page 17 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS Troubleshooting Procedures for (1) If the proper voltage is present, replace the coil and shutter assembly or the entire plug-in C7076A and C7076D Flame electronics chassis (see Service section). (2) If the measured voltage is not within the proper Detectors.
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Page 18: Service
C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS Periodic Maintenance connect a dc voltmeter (capable of measuring 50 volts) across terminals 6 (F) and 5 (G) on the terminal block (F 1. Scheduled replacement of the detector components is is +; G is -). not necessary. - 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 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. 9. Slide the new coil and shutter assembly into place. Make REPLACING THE COIL AND SHUTTER ASSEMBLY sure its part number and voltage rating are correct.
- 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 4. Loosen the four captive screws in the front cover plate REPLACING THE GASKET SEALS (C7076A DETECTOR and remove the plate. ONLY) 5. Press on the back of the silicone-rubber grommet until it 1. Open the master switch to interrupt all power to the pops out of the cover plate.
- Page 23 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS 95-8269—04...
- Page 24 C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North ® U.S. Registered Trademark Golden Valley, MN 55422 © 2011 Honeywell International Inc. 95-8269—04 M.S. Rev. 07-11 customer.honeywell.com Printed in U.S.A.
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