System Sensor 2251 and 2251T Intelligent Photoelectric - Manual (Page 3)

D200-80-00 3 I56-1236-03R
A78-2462-00
SENSOR
COVER
SENSING
CHAMBER
SENSING
CHAMBER
COVER
SENSOR
SCREEN COVER REMOVAL
TABS
A78-2463-08
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.
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 8.
3. Remove the screen assembly by pulling it straight out
(see Figure 4).
4. Remove the sensing chamber cover by pulling it
straight out.
5. Clean the vaned chamber piece by vacuuming or
blowing out dust and particles.
6. Replace the sensing chamber cover, aligning the arrow
on the top with arrow on the printed circuit board.
7. To replace the screen, place it over the chamber
assembly, turning it until it snaps into place.
8. Replace the cover using the LEDs to align the cover
and then gently pushing it until it locks into place.
9. Reinstall the detector.
10. Test the detector as described in TESTING.
11. Reconnect disabled circuits.
12. Notify the proper authorities that the system is back
on line.
A78-2460-02
Figure 2. Rotary decade address switches:
Figure 3. Test magnet position:
Figure 4. Sensor assembly:
0
8 7
1
2
3
4
5
6
9
0
8 7
1
2
3
4
5
6
9
D
N
T
N
I
A
P
T
O
O
LED STATUS
INDICATORS
TEST
MAGNET
PAINTED
SURFACE
PAINTED
SURFACE
MAGNET TEST
MARKER
TEST
MAGNET