Concord
13
•
ESL models
429AT, 521B, 521BXT—(models 521B and 521BXT require the following dip
switch settings: 1-on, 2-off)
When set up for 2-wire smoke detectors, zone 8 can handle up to 10 smoke detectors with
120 uA maximum idle current per detector. Maximum total loop current allowed in an alarm con-
dition is 100 mA. Connect one or more, 2-wire smoke detectors to the panel as shown in
Figure 10.
Note
The Two-Wire Smoke set-
ting (in program mode) must
be off when using 4-wire
smoke detectors. See
ONBOARD
OPTIONS
—
INPUTS
in the section “Programming
the Panel” for complete
details.
Figure 10. Connecting 2 and 4-Wire Smoke Detectors to the Panel
Connecting 4-Wire Smoke Detectors
Zone input 8 can be used with 4-wire smoke detectors that latch and remain in the alarm state
until power is removed, then restored to the detector. The panel provides this power interruption
from terminal 23 (2-wire smoke power +), provided that zone 8 is learned into sensor group 26
(fire).
Note
Zone 8 must be learned into
sensor group 26 (fire) for
connected smoke detectors
to reset after canceling a fire
alarm.
Table 5 describes the minimum available panel power. Use only 4-wire smoke detectors that
operate at these power limits. Connect up to five Sentrol (ESL) model 449AT (part no. 13-360)
smoke detectors to panel power and zone 8 input as shown in Figure 10.
Use only the 2-wire smoke detector models described above. Alarm signals from other
detectors may not be processed correctly if the panel has lost AC power and is operating
only from the backup battery.
Caution
!
Panel
Terminals
2k Ohm EOL
(Locate at Last Detector)
Resistor 49-454
2 2
2 3
Z O N E
8
+ 1 2 V
2 W S M K
2 0
2 1
G N D
Z O N E
7
+
C
O
M
. . . . . . . .
+ - -
C
O
M
N
O
N
O
+
C
O
M
. . . . . . . .
+ - -
C
O
M
N
O
N
O
2k Ohm EOL
(Locate at Last Detector)
Resistor 49-454
Model
449AT
Model
449AT
Zone
8
22
23
+12V
2W SMK
2-Wire
4-Wire
Table 5: Panel Minimum Available Power
Min. Voltage/Max. Current Available
8.3 VDC, up to 30 mA total (combined alarm) current
8.1 VDC, up to 40 mA total (combined alarm) current
7.7 VDC, up to 60 mA total (combined alarm) current
7.4 VDC, up to 80 mA total (combined alarm) current