D450-00-00
3
I56-2816-002R
CLASS A OPTIONAL WIRING
UL
LISTED COMP
AT
IBLE
CONVENTIONA
L
CONTROL
P
ANE
L
EXTERNAL
24V
SUPPL
Y
CLASS A OPTIONAL WIRING
UL
LISTED
EOL
RESISTOR
UL
LISTED
EOL
RELAY
24V
(+) INIT.
(−) INIT.
(−)POWER
(+)POWER
4 5
2 1
3
4 5
2 1
3
4 5
2 1
3
Figure 3. Typical wiring layout:
SNAP ON
DECORATIVE
RING
SCREWS (NOT
SUPPLIED)
DETECTOR
BASE
BOX (NOT
SUPPLIED)
SHORTING
SPRING
Mounting
NOTE:
It is recommended that the base be completely
wired before mounting.
See Figure 4. Attach the base directly to an electrical box us-
ing the screws supplied with the box. Then, use the plastic
screw covers, supplied with the base, to cover the screws.
The sounder base is 1.1 inches (28 mm) deep. Electrical boxes
must be 4 inches (102 mm) square by at least 1-
1
/
2
inches
(38 mm) deep; 2-
1
/
8
inches (54 mm) is recommended.
Testing
Before testing, notify the proper authorities that the smoke de-
tector system is undergoing maintenance and that the system
will be temporarily out of service. Disable the zone or system
undergoing maintenance to prevent unwanted alarms.
Detectors and bases must be tested after installation and
following periodic maintenance.
Test the B401BH-2 as follows:
1. Test the conventional detector head following the proce-
dure in its manual. The B401BH-2 should sound approx-
imately 0.75 to 5.7 seconds after the detector alarms.
2. Reverse the polarity of the external 24 VDC supply. This
should cause every base in the loop to sound after ap-
proximately 0.75 to 5.7 seconds.
Figure 4. Mounting to an electrical box:
C0503-00
D450-00-00
2
I56-2816-002R
B401BH-2 Terminals
No.
Function
1
External Supply Positive (+)
2
External Supply Negative (–)
3
Negative (–) V
4
Positive (+) V In
5
Positive (+) V Out
Terminals 3, 4, and 5 are used for the communication/ini-
tiating circuit.
Installation Wiring Guidelines
All wiring must be installed in compliance with the Na-
tional Electrical Code and all applicable local codes and
any special requirements of the authority having jurisdic-
tion, using the proper wire size. The conductors used to
connect smoke detectors to control panels and accessory
devices should be color-coded to reduce the likelihood of
wiring errors. Improper connections can prevent a system
from responding properly in the event of a fire.
For signal wiring (the wiring between interconnected de-
tectors), it is recommended that the wire be no smaller
than AWG 18. However, the screws and clamping plate in
the base can accommodate wire sizes up to AWG 12. The
use of twisted pair wiring or shielded cable for the power
(+ and –) loop is recommended to minimize the effects of
electrical interference on the initiating loop.
Begin electrical connections by stripping about 3/8” insula-
tion from the end of the wire. Then, slide the bare end of
the wire under the clamping plate and tighten the clamping
plate screw. Break the wire at each terminal to ensure that
the connections are supervised, as shown in Figure 2.
Figure 2.
DO NOT loop the wire under the clamping plate.
Check the zone wiring of the detector base before the
detector heads are installed. Perform continuity, base polar-
ity, and dielectric tests on the wiring.
Smoke detectors and alarm system control panels have
specifications for allowable supervision current. Consult
the control panel manufacturer’s specifications for the
total loop current supervision allowed for the control panel
being used before wiring the detector loops.
Wiring Instructions
The shorting spring in the base will disengage automati-
cally when the detector head is removed from the base.
DO NOT
remove the shorting spring since it reengages as the
detector head is turned into the base, completing the circuit.
A typical wiring for a two-wire conventional system is
shown in Figure 3. Refer to this diagram as needed while
wiring the base into the system.
NOTE:
Figure 3 shows external 24V supply polarity when
the loop system is in standby (NOT alarming).
Figure 1. Terminal Layout:
C0471-00
C0473-00
C0956-00
