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65-0156—1

C7024E,F 24 Vdc

Solid State Purple Peeper

Ultraviolet Flame Detectors

 L.Z.  •  Rev. 4-94  •  ©Honeywell Inc. 1994  •  Form Number 65-0156—1

CONTENTS

Specifications ................................................. 2
Ordering Information ..................................... 2
Installation ..................................................... 3
Adjustments and Checkout ............................. 9
Troubleshooting ........................................... 10
Service .......................................................... 11

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:

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].

Summary of Contents for C7024E

Page 1: ...ed lead wires allow rapid electrical installation Two flame detectors can be wired in parallel to reducenuisanceshutdownsindifficultflamesight 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 int...

Page 2: ...TINGS 60 F to 175 F 51 C to 79 C HOUSING C7024E Violet cast aluminum cover mounting flange with heat block and faceplate are separate to pro vide heat insulation and sealoff Meets NEMA 4 enclosure requirements indoor outdoor protec tion rain tight dust tight hose directed water Optional water jacket available for the C7024E C7024F Explosion proof two piece violet cast aluminum PRESSURE RATING OF Q...

Page 3: ...k the ratings given in the instructions and on the product to make sure the product is suitable for your application 3 Installer must be a trained experienced flame safe guard service technician 4 After installation is complete check out product operation as provided in these instructions CAUTION Ultraviolet sensing tubes have a life expectancy of 40 000 hours of continuous use within ambi ent tem...

Page 4: ... If the C7024 is subject to excessive vibration a spe cial antivibration mount part number 123539 can be used for the C7024E If you use this mount install it before positioning and sighting the detector CLEARANCE Make sure there is enough room to easily mount the sight pipe detector and all the required fittings and to remove the detector for troubleshooting and service RADIATION SOURCES Other tha...

Page 5: ...ay resulting in burner shutdown The problem can be eliminated by diluting the con taminants A strong flow of air through the sight pipe will clear a viewing path through the attenuating mate rial Refer to Sight Pipe Ventilation section It is also desirable to sight the detector at an area containing fewer masking agents such as near the burner nozzle or near the entrance of the combustion air Incr...

Page 6: ...7024 1 CLOSE NIPPLE 3 4 in FOR A C7024E 1 in FOR A C7024F TEMPORARY TACK WELD COMBUSTION CHAMBER WALL REDUCER BLACK IRON SIGHT PIPE 1 1 2 TO 3 in 38 TO 76 mm DIA REFRACTORY FLARED HOLE 1 IF VENTILATION OF THE SIGHTING PIPE IS REQUIRED ADD PIPE TEE PERFORATED NIPPLE OR OTHER SUITABLE DEVICE FOR VENTILATION M1958A SIGHT PIPE VENTILATION It may be necessary to ventilate the sight pipe to cool the det...

Page 7: ... see Fig 8 1 The mounting flange is in two pieces Loosen but do not remove the three screws holding the flange together 2 Slightly rotate the detector so the slots in the back section of the mounting flange clear the screws in the front section then separate the two sections 3 Screw the front section of the mounting flange onto the sight pipe reducer or other fitting 4 Fit the slots in the back se...

Page 8: ... for operation up to 600 volts and for breakdown up to 7500 volts For the other leadwire use moisture resistant no 14 wire selected for a temperature rating above the maximum operating temperature 7 Refer to Fig 10 for wiring connections Fig 10 Wiring diagram for C7024E F Detec tors with RM7824 Flame Safeguard controls with shutter drive circuitry IMPORTANT Do not run the flame detector wiring in ...

Page 9: ...rner flame alone and both together unless monitoring only the pilot flame when using an intermittent pilot or only the main burner flame when using direct spark ignition With the detector in its final position all re quired flame signals must be steady or stable and as specified in Table 1 If you cannot obtain the proper signal refer to the Troubleshooting section PILOT TURNDOWN TEST If the detect...

Page 10: ...u encounter other problems in the system refer to the Trouble shooting section in the instructions for the appropriate flame safeguard control NOTE For instructions for replacing the viewing win dow sensing tube and coil and shutter assembly see the Service section TROUBLESHOOTING PROCEDURES First perform the Preliminary Inspection then follow the applicable procedures for either a low reading or ...

Page 11: ...roubleshooting section and use a clean cloth placed over the eraser end of a pencil You do not have to remove the window or lens to clean it If it is broken or damaged or if it is coated with a substance that cannot be cleaned replace it see Fig 14 2 Keep the flame detection system adjusted for the smoothest most reliable operation recommended by the burner manufacturer 3 Replace the sensing tube ...

Page 12: ...section NOTE The C7024F Cover has a small hole that is keyed to a pin on the body flange REPLACING THE QUARTZ VIEWING WIN DOW Or Focusing Lens IMPORTANT A quartz window or lens must be used Ordinary glass absorbs or filters out ultraviolet radiation C7024E see Fig 14 1 Open the master switch remove the detector from the sight pipe and remove the cover from the detector 2 Remove the ultraviolet sen...

Page 13: ...1 2 RED RUBBER WASHER BETWEEN GASKET AND FLANGE 114465 RUBBER MOUNTING GASKETS 3 WINDOW APERTURE BACK SECTION OF MOUNTING FLANGE 120739 GRAY ASBESTOS NEOPRENE GASKET MOUNTING SCREWS 3 2 3 M1961A C7024F See Fig 15 1 Open the master switch and remove the detector from the sight pipe 2 Unscrew the four hex head bolts holding the seal off flange to the faceplate and remove the flange To avoid losing t...

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Page 16: ...rol 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 Printed in U S A QUALITY IS KEY ...

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