System Sensor B501BHT-2 - Manual (Page 2)

D250-02-00 2 I56-2814-003R
For signal wiring (the wiring between interconnected sensors
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 per-
formance, 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 interference.
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 in-
stallation temperature.
Wiring instructions
NOTE: External supply shown in normal standby configura-
tion in Figures 4 and 5.
The wiring diagram for a typical 2-wire intelligent system is
shown in Figures 4 and 5 (the monitor module is supervising
the external supply).
Testing
Sensors and bases must be tested after installation and as an inte-
gral part of periodic maintenance. Test the B501BHT-2 as follows:
NOTE: Before testing, notify the proper authorities that the
smoke sensor system is undergoing maintenance and, there-
fore, will be temporarily out of service. Disable the system un-
dergoing maintenance to prevent unwanted alarms.
1. If configured as in Figure 4 or 5, reverse the polarity of
the external 24VDC supply. If configured using the optional
Intelligent Relay Module, as in Figure 5, turn on the Intelli-
gent Relay Module. All B501BHT-2 bases on the loop should
sound in approximately 0.75 to 5.7 seconds.
2. Latch the sensor LED on from the control panel. That
unit’s B501BHT-2 should sound in approximately 0.75 to
5.7 seconds.
NOTES:
1. There is approximately a 0.75 to 5.7 second delay built
into the B501BHT-2 before sounding. This delay is present
whether the control signal comes from the sensor or from
the external power supply polarity being reversed.
2. During automatic testing cycles, the horn may sound if
the associated sensor is left in the test mode with LEDs
latched on for more than 0.75 seconds. Therefore, it is
necessary to complete testing of each sensor within this
0.75-second limit to prevent the horn from sounding.
Figure 1. Terminal layout:
5
4 3
2
1
Figure 2. mounting:
MOUNT B501BHT-2
TO ELECTRICAL BOX
4 INCH SQUARE BOX
Figure 3:
C0736-00
C0891-00
C0473-00