Honeywell C7024E, User Manual

Page: 12 / 16

65-0156—1 12
Fig. 12—Replacing ultraviolet radiation
sensing tube.
REPLACING THE COIL AND SHUTTER
ASSEMBLY
NOTE: Use only a 190971G Coil and Shutter Assembly.
The actual operating voltage of the coil will be 24
Vdc. See Fig. 13.
Fig. 13—Replacing coil and shutter assembly
on C7024E,F.
1. Open the master switch and remove the detector
cover (see instructions above).
2. Remove the ultraviolet sensing tube (steps 1 through
5 of Replacing the Ultraviolet Sensing Tube procedure
above).
3. Cut the white wires as close as possible to the
crimped connectors and remove the crimped connectors.
4. Remove the three mounting screws from the base
of the coil and shutter assembly. Put the screws in a safe
place to avoid losing them.
5. Remove the coil and shutter assembly.
6. Put the new coil and shutter assembly into place.
IMPORTANT: Be very careful not to kink or otherwise
damage the flexible shutter.
7 Insert the three mounting screws into the base of
the coil and shutter assembly and securely tighten.
8. Remove sufficient insulation from each of the two
white leadwires remaining on the detector, and also from
each of the two white leadwires on the new coil.
9. Using solderless connectors, connect one of the
coil wires to one of the remaining white leadwires.
Connect the other coil wire to the other remaining white
leadwire.
10. Reinstall the sensing tube (steps 6 through 9 of
Replacing the Ultraviolet Sensing Tube 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 sensing tube.
3. Loosen the three screws holding the back section
of the mounting flange to the faceplate. Carefully re-
move and keep together the three screws, the gray asbes-
tos-neoprene gasket, the red rubber washer, and the back
section of the mounting flange.
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.
4. Using the eraser end of a pencil, push out the
viewing window (with its rubber mounting gaskets)
from the inside of the faceplate.
5. Insert one rubber mounting gasket into the win-
dow aperture in the faceplate.
6. Insert the new quartz viewing window (or focus-
ing lens) into the window aperture. You can insert the
window with either side toward the flame.
7. Insert two rubber mounting gaskets (only one gas-
ket when replacing a focusing lens) into the aperture.
C7024E,F
SERVICE
COIL
WHITE
WIRES
CRIMPED CONNECTORS
MOUNTING
SCREWS (3)
FLEXIBLE
SHUTTER
BASE OF 190971G COIL
AND SHUTTER ASSEMBLY
M13247
ULTRAVIOLET
SENSING
TUBE
SHUTTER ASSEMBLY
(C7024E OR F)
TUBE BASE
TUBE SOCKET
SCREWDRIVER
ALIGNMENT
GUIDE
(C7024E OR F)
FLEXIBLE
SHUTTER
(C7024E OR F)
M13248