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Solid State Purple Peeper
Ultraviolet Flame Detectors
The C7204E,F 24 Vdc Flame Detectors are
solid-state electronic devices for sensing the
ultraviolet radiation emitted by the combustion
of most carbon containing fuels such as natu-
ral gas, LP gases, and oil.
C7024E,F:
Solid-state electronic circuitry provides low power
consumption and high reliability.
Detectors can be mounted horizontally, vertically or
at any angle in between. The self-checking models
require faceplate alignment and have integral lo-
cating reference points to assure proper operation
of the shutter mechanism.
Ultraviolet radiation sensing tube and quartz view-
ing window are field replaceable.
Threaded conduit fitting and color-coded lead-
wires allow rapid electrical installation.
Two flame detectors can be wired in parallel to
reduce nuisance shutdowns in difficult flame sight-
ing applications.
A swivel mount is available to facilitate flame
sighting.
Models are available with a -40° F [-40° C] rating.
Incorporates UV sensor tube checking feature
used with Honeywell dynamic self-check R7824C
Flame Signal Amplifiers.
Oscillating shutter interrupts ultraviolet radiation
reaching UV sensor 12 times per minute to provide
the UV sensor checking function. Amplifier cir-
cuitry components are checked from the micro-
processor in the RM7824.
C7024E,F 24 Vdc
C7024E:
Housing meets NEMA 4 enclosure standards (in-
door, outdoor protection: rain-tight, dust-tight, hose
directed water).
Protective heat block built into the mounting flange.
High pressure (50 psi) [345 kPa] quartz viewing
window, focusing lens and antivibration mount-
ing accessories available.
C7024F:
Housing designed to be explosion-proof and Un-
derwriters Laboratories Inc. Component Recognized
for use in hazardous locations: Class 1, groups C
and D, and Class 2, groups E, F and G.
Viewing window rated for 100 psi [690 kPa].
CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Installation ..................................................... 3
Adjustments and Checkout ............................. 9
Troubleshooting ........................................... 10
Service .......................................................... 11
L.Z. • Rev. 4-94 • ©Honeywell Inc. 1994 • Form Number 65-0156-1
1
65-0156-1
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Summary of Contents for Honeywell C7024E
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Page 1: Table Of Contents
Adjustments and Checkout ......9 the UV sensor checking function. Amplifier cir- Troubleshooting ........... 10 cuitry components are checked from the micro- Service ............11 processor in the RM7824. L.Z. • Rev. 4-94 • ©Honeywell Inc. 1994 • Form Number 65-0156—1 65-0156—1... -
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 Home and Building Control Sales Office (check white pages of your phone directory). 2. Home and Building Control Customer Satisfaction Honeywell Inc., 1885 Douglas Drive North... -
Page 3: Installation
C7024E,F SPECIFICATIONS • INSTALLATION Fig. 1—Dimensions of C7024E in in. [mm]. Fig. 2—Dimensions of C7024F in in. [mm]. MOUNTING FLANGE 3/4–14 NPT 1–11-1/2 NPT [183] FACEPLATE PIPE UNION 1[25] [130] [203] [95] DIA. [127] [87] [52] 1/2–14 NPT [38] [51] 1/2–14 NPSM... - Page 4 Also, if the detector sights the flame at an angle instead cial antivibration mount, part number 123539, can be used for the C7024E. If you use this mount, install it of perpendicularly, it views more flame depth. There- before positioning and sighting the detector.
- Page 5 C7024E,F INSTALLATION SCREENING EFFECTS Fig. 3—Detector sighting angle. Smoke, oil, mist, dirt and dust are masking agents that attenuate the ultraviolet radiation emitted by the flame. If they absorb too much radiation, the amount of DETECTOR IN GOOD SIGHTING POSITION ultraviolet radiation reaching the detector is reduced.
- Page 6 If the vibration is excessive, part no. 123539 In some cases, the sight pipe will not directly fit the Antivibration Mount is available for the C7024E. (For C7024 Mounting Flange or union. Also, it may be desir- mounting details, see form 60-0361.) If you use this able or necessary to vent the sight pipe.
- Page 7 C7024E,F INSTALLATION The C7024E has notch and arrow indicators (see Fig. 7) Fig. 6—Vertical Mounting of C7024E,F Detectors. on the faceplate to facilitate mounting in positions other than those shown in Fig. 6. The notch and arrow must be vertically aligned with the notch in the up position and the arrow pointing downward.
- Page 8 1 A R7824C DYNAMIC SELF-CHECK AMPLIFIER MUST BE USED WITH A RM7824 FLAME SAFEGUARD CONTROL INCORPORATING THE SHUTTER DRIVE CIRCUIT. When using a C7024E or F with a R7824C Dy- namic Self-Check Amplifier, be careful not to VOLTAGE AND FREQUENCY RATING OF THE C7024E, F MUST MATCH THE POWER SUPPLY OF THE FLAME SAFEGUARD CONTROL.
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Page 9: Adjustments And Checkout
If a reddish glow appears when there is no flame present, NOTES: replace the UV sensing tube. When performing this test, 1. For a C7024E or F, the shutter operation causes make sure there are no extraneous sources of ultraviolet fluctuations in the current reading. Read the aver- radiation in the test area. -
Page 10: Troubleshooting
1.25 Self-Check Shutter operation of the C7024E,F causes fluctuations in the readings. Read the average stable current or voltage disregarding the peaks. This minimum or greater signal should be obtained if the detector is correctly installed and positioned to properly sense flame. -
Page 11: Service
C7024E or F). 2. Keep the flame detection system adjusted for the 6. On a C7024E or F, insert the new tube through the smoothest, most reliable operation recommended by the openings in the shutter assembly. - Page 12 NOTE: If the viewing window (with its rubber mounting gaskets) is stuck to the mounting flange, skip step 4. IMPORTANT: On a C7024E, be very careful not to kink or otherwise damage the flexible shutter. FLEXIBLE SHUTTER 4.
- Page 13 9. Reinstall the detector on the sight pipe. Fig. 14—Replacing quarts viewing window or Fig. 15—Replacing quartz viewing window on focusing lens on C7024E. C7024F. HEX-HEAD BOLT (4) FACEPLATE PENCIL...
- Page 14 65-0156—1...
- Page 15 65-0156—1...
- Page 16 Home and Building Control Home and Building Control Helping You Control Your World Honeywell Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley, MN 55422 Scarborough, Ontario M1P 2V9 QUALITY IS Printed in U.S.A. 65-0156—1...
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