System Sensor 2251 and 2251T Intelligent Photoelectric - Manual (Page 2)

D200-80-00 2 I56-1236-03R
Dust covers provide limited protection against airborne
dust particles during shipping. Dust covers must be
removed before the sensors can sense smoke. Remove sen-
sors prior to heavy remodeling or construction.
Testing
Before testing, notify the proper authorities that the system
is undergoing maintenance, and will temporarily be out of
service. Disable the system to prevent unwanted alarms.
All sensors must be tested after installation and periodical-
ly thereafter. Testing methods must satisfy the Authority
Having Jurisdiction (AHJ). Sensors offer maximum per-
formance when tested and maintained in compliance with
NFPA 72.
The sensor can be tested in the following ways:
A. Functional: Magnet Test (P/N M02-04-01 or M02-09-00)
This sensor can be functionally tested with a test mag-
net. The test magnet electronically simulates smoke in
the sensing chamber, testing the sensor electronics and
connections to the control panel.
1. Hold the test magnet in the magnet test area as shown
in Figure 3.
2. The sensor should alarm the panel.
Two LEDs on the sensor are controlled by the panel to
indicate sensor status. Coded signals, transmitted
from the panel, can cause the LEDs to blink, latch on,
or latch off. Refer to the control panel technical doc-
umentation for sensor LED status operation and
expected delay to alarm.
CAUTION
A78-2461-00
3 2
1
3 2
1
+
–
–
+
UL LISTED COMPATIBLE
CONTROL PANEL
OPTIONAL RETURN LOOP
REMOTE ANNUNCIATOR
+ –
B. Smoke Entry: Aerosol Generator (Gemini 501)
The GEMINI model 501 aerosol generator can be used
for smoke entry testing. Set the generator to represent
4%/ft to 5%/ft obscuration as described in the GEMINI
501 manual. Using the bowl shaped applicator, apply
aerosol until the panel alarms.
C. Direct Heat Method (Hair Dryer of 1000-1500 watts)
2251T only
A hair dryer of 1000-1500 watts should be used to test
the thermistors. Direct the heat toward either of the two
thermistors, holding the heat source approximately 12
inches from the detector in order to avoid damaging the
plastic housing. The detector will reset only after it has
had sufficient time to cool. Make sure both thermistors
are tested individually.
A sensor that fails any of these tests should be cleaned as
described under CLEANING, and retested. If the
sensor fails after cleaning, it must be replaced and returned
for repair.
When testing is complete, restore the system to normal
operation and notify the proper authorities that the
system is back in operation.
Figure 1. Wiring diagram: