System Sensor 2451A Installation And Maintenance Instructions page 3

1. Place the magnet against the cover opposite the test
module slot to activate the test feature (see Figure
1).
2. The LEDs should latch on within 5 seconds indicating
alarm and annunciating the panel.
B. Calibrated Test Card (System Sensor no. R59-18-00)
1. Remove the detector cover by placing a small blad-
ed screwdriver in the side slot of the detector cover,
twisting it slightly until the cover can be turned coun-
terclockwise for removal.
2. Insert the NO ALARM end of the test card fully into the
test slot (see Figure 2) then slide it counterclockwise
until it stops.
3. Wait for at least 20 seconds. The detector should
NOT alarm.
4. Remove the test card by sliding it clockwise before
removing, then insert the ALARM end.
5. The LEDs should latch on within 20 seconds indi-
cating alarm and annunciating the panel.
6. Put the cover back by gently rotating it clockwise until
it locks in place.
C. Test Module (System Sensor no. MOD400R)
The MOD400R is used with your DMM or voltmeter
to check the detector sensitivity as described in the
MOD400R's manual.
D. Aerosol Generator (Gemini 501)
Set the generator to represent 4% to 5%/Ft. obscuration
as described in the Gemini 501 Manual. Using the bowl
shaped applicator, apply aerosol until the unit alarms.
Notify the proper authorities that the detection system is
back on line.
Maintenance
It is recommended that the detector be removed from its
mounting base to facilitate easier cleaning. The detector is
cleaned as follows:
NOTE: Before removing the detector, notify the proper
authorities that the smoke detector system is un-
dergoing maintenance and will temporarily be out
of service. Disable the zone or system undergoing
maintenance to prevent unwanted alarms.
1. Remove the detector cover by placing a small bladed
screwdriver in the side slot of the detector cover, twisting
it slightly until the cover can be turned counterclockwise
for removal.
D400-02-01 REV#-002
Detectors that fail these tests should be cleaned as de-
scribed under MAINTENANCE and retested. If the detec-
tors still fail these tests they should be returned for repair.
Figure 2:
TEST SLOT
HEAD COVER
REMOVAL SLOT
3
REMOVABLE HEAD COVER
CLEANABLE SCREEN
P/N RS24 (W/O THERMAL)
VANED CHAMBER
A78-1213-01
I56-1020-000