Honeywell C7076A Operating Instructions Manual page 13

4 Cut the two white coil wires as close to the coil as possible.
5 Remove the mounting screws from the base of the coil and shut-
ter assembly.
6 Turn the chassis over and locate the sensing tube.
7 Gently push the alignment guide away from the tube (just enough
to free the tip of the sensing tube) and swing the tube out from
the chassis as far as it will go.
8 Remove the other mounting screw from the base of the coil and
shutter assembly.
9 Carefully slide the coil and shutter assembly out of the chassis.
➔ It may be necessary to move some of the transformer leadwires
out of the way in order to slide the coil and shutter assembly
past them.
10 Slide the new coil and shutter assembly into place. Make sure its
part number and voltage rating are correct.
11 Remove about 1/4 in. (6 mm) of insulation from each of the two
short, white leadwires still connected to the octal plug.
12 Using wire nuts, connect one of the coil wires to one of the short,
white leadwires on the plug and connect the other coil wire to the
other short, white leadwire.
13 Insert the two mounting screws in the base of the coil and shut-
ter assembly and tighten them securely.
14 Swing the sensing tube back into place in the chassis. The align-
ment guide will snap into place around the tip of the tube.
15 Reinstall the plug-in electronics chassis as specified above in
page 12 (14.2 Replacing the Plug-In electronics chassis).
16 Close the master switch and perform the Adjustments and Check-
out (see page 8 (11 Adjustments and checkout)).
IMPoRtAnt
Be very careful not to kink or otherwise damage the shutter.
14.5 Replacing the viewing lens
Replacing the lens
1 Front cover plate
2 Captive screws
3 Lens
4 Grommet small flange
1 Open the master switch to interrupt all power to the detector.
IMPoRtAnt If the combustion chamber has a positive pressure,
make sure the aspirator inlet pressure equals or exceeds that re-
quired for sight pipe seal off, as given in page 6 (9.5 Connecting
air supply (optional)) on figure "Minimum inlet pressure or airflow",
before unlatching the detector.
2 Unlatch the detector and swing it away from the faceplate-aspi-
rator.
3 Loosen the four captive screws in the front cover plate and remove
the plate.
4 Press on the back of the silicone-rubber grommet until it pops
out of the cover plate.
5 Push on the back of the lens until it pops out of the grommet.
6 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.
7 Push the small flange of the grommet through the hole in the
cover plate until it pops into place. Make sure the flange is com-
pletely through the the hole and the grommet is properly seated.
8 Clean both sides of the viewing lens with a soft, clean cloth.
➔ If the silicone gasket gets damaged, then replace it.
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