System Sensor 7251 Installation And Maintenance Instructions page 3

Figure 2. Rotary decade address switches:
8
7 9
6
5
4
3
2
1
0
Figure 3. Test magnet position:
PAINTED
SURFACE
MAGNET TEST
TEST
MAGNET
PAINTED
SURFACE
Figure 4. Sensor assembly:
COVER REMOVAL
TABS
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D200-09-00
8
7 9
6
5
4
3
2
1
0
LED STATUS
INDICATORS
MARKER
SENSOR
COVER
SCREEN
ASSEMBLY
SENSING
CHAMBER
A78-2586-01
Cleaning
It is recommended that the detector be removed from its
mounting base to facilitate cleaning. The detector is
cleaned as follows:
NOTE: Before removing the detector, notify the proper
authorities that the smoke detector system is
undergoing maintenance and will be temporarily
out of service. Disable the zone or system under-
going maintenance to prevent unwanted alarms.
A78-2460-02
1. Remove the detector cover by prying away the four
side tabs with a small-bladed screwdriver, and then
pulling the cover from the base.
2. Vacuum the screen carefully without removing it. If
further cleaning is required continue with Step 3, oth-
erwise skip to Step 7.
3. Remove the screen/chamber cover assembly by
pulling it straight out (see Figure 4).
4. Clean the chamber by vacuuming or blowing out dust
and particles.
5. Replace the sensing chamber cover, aligning the arrow
on the top with arrow on the printed circuit board.
6. To replace the screen, place it over the chamber
assembly, turning it until it snaps into place.
7. Replace the cover using the LEDs to align the cover
and then gently pushing it until it locks into place.
8. Reinstall the detector.
9. Test the detector as described in TESTING.
10. Reconnect disabled circuits.
11. Notify the proper authorities that the system is back
on line.
A78-2462-00
3 I56-058-01R