System Sensor B501BH - Manual (Page 2)

D650-03-00 2 I56-491-06R
B501BH Terminals
No. Function
1
External Supply Positive (+)
2 External Supply Negative (–)
3 Negative (–) Comm. Line In and Out
4 Positive (+) Comm. Line In and Out
5 Sounder Base Interconnect
Terminals 3 and 4 are used for the communication circuit.
Mounting
Mount the B501BH directly to an electrical box, using the
mounting kit, supplied (see Figure 2).
The sounder base is 1.1-inches deep. Electrical boxes must
be 4-inches square by at least 1
1 ⁄
2
inches deep - 2 1 ⁄
8
inches
is recommended.
NOTE: A maximum space of 1 ⁄
8
inch from the outside edge
of the electrical box to the inside edge of the dry-
wall or ceiling tile is allowable.
Wiring Guidelines
All wiring must be installed in compliance with the
National Electrical Code and the local codes having juris-
diction and must not be of such length or wire size which
would cause the base to operate outside of its published
specifications. The conductors used to connect smoke sen-
sors to control panels and accessory devices should be
color coded to reduce the likelihood of wiring errors.
Improper connections can prevent a system from respond-
ing properly in the event of a fire.
For signal wiring (the wiring between interconnected sen-
sors or modules), it is recommended that the wire be no
smaller than 18 gauge (1.0 square mm). Wire sizes up to
12 gauge (2.5 square mm) may be used with the base. For
best system performance, the power (+ and –) wires and
the communication circuit wires should be twisted pair or
shielded cable installed in separate grounded conduit to
protect the communication loop from electrical interfer-
ence.
Make wire connections by stripping about 3 ⁄
8
" of insulation
from the end of the wire. Then, slide the bare end of the
wire under the clamping plate, and tighten the clamping
plate screw. Do NOT loop the wire under the clamping
plate (See Figure 3).
The zone wiring of the sensor base should be checked
before the sensor heads are installed. Check the wiring for
continuity and polarity in the base.
See the individual sensor manual for the maximum sensor
installation temperature.
Figure 1. Terminal layout:
Figure 2. Mounting:
MOUNT B501BH
TO ELECTRICAL BOX
4 INCH SQUARE BOX
A78-1993-02
Figure 3: