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Honeywell C7076D Product Data page 22

Adjustable sensitivity ultraviolet flame detectors
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C7076A,D ADJUSTABLE SENSITIVITY ULTRAVIOLET FLAME DETECTORS
3. Unlatch the detector and swing it away from the
faceplate-aspirator.
4. Loosen the four captive screws in the front cover plate
and remove the plate.
5. Press on the back of the silicone-rubber grommet until it
pops out of the cover plate.
6. Push on the back of the lens until it pops out of the
grommet.
7. Insert the new lens, flat side toward the grommet small
flange and curved side toward the flame, into the recess
in the grommet. Make sure the recess completely
encloses the lens.
8. Push the small flange of the grommet through the hole
in the cover plate until it pops into place. Make sure the
flange is completely through the the hole and the
grommet is properly seated.
9. Clean both sides of the viewing lens with a soft, clean
cloth.
10. Put the front cover plate back on and tighten the four
screws securely.
11. Latch the detector against the faceplate-aspirator and
close the master switch.
Replacing the Lens in the C7076D Flame Detector
1. Open the master switch to interrupt all power to the
detector.
2. Remove the four screws securing the faceplate
(attached to the sight pipe) to the detector housing.
Force the faceplate and housing sufficiently far apart to
provide access to the lens mounted on the sight tube on
the bracket assembly inside the housing.
3. Remove the rubber grommet containing the lens from
the sight tube.
4. Press on the back of the lens until it pops out of the
grommet.
5. Insert the new lens, flat side toward the small flange and
curved side toward the flame, into the recess of the
grommet. Make sure the recess completely encloses
the lens.
6. Clean both sides of the lens with a soft, clean cloth.
Reinstall the grommet on the sight tube on the bracket.
7. Realign the faceplate and detector housing. Install the
four screws in the faceplate and tighten securely.
8. Close the master switch.
95-8269—1
REPLACING THE GASKET SEALS (C7076A DETECTOR ONLY)
1. Open the master switch to interrupt all power to the
detector.
2. If the combustion chamber has a positive pressure,
make sure the airflow through the aspirator equals or
exceeds the value required for seal-off (see Fig. 10).
3. Unlatch the detector and swing it away from the
faceplate-aspirator.
4. Loosen the four captive screws in the front cover plate
and remove the plate.
5. Using a putty knife, carefully separate the silicone-
rubber gasket from the inside of the plate (see Fig. 22).
6. Pull the gasket over the ends of the four screws and
discard the gasket.
7. Scrape any residual adhesive from the plate, leaving a
smooth surface to which the new gasket can adhere.
8. Insert the four screws through the holes in the corner of
the new gasket.
9. Glue the new gasket to the plate, using a good silicone
rubber adhesive, such as RTV32. Follow the
instructions supplied with the adhesive.
10. Put the cover plate back on and tighten the four screws
securely.
11. Repeat steps 4 through 10 for the rear cover plate.
12. Latch the detector against the faceplate-aspirator and
close the master switch.
SILICONE-RUBBER GASKET
PUTTY KNIFE
Fig. 22. Replacing the C7076A Detector gasket seals.
22
CAPTIVE
SCREW (4)
COVER PLATE
M20767

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