System Sensor B501BH-2 User Manual
Page 2
D250-04-00
2
I56-2813-003R
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 Figure 4 and 5.
The wiring diagram for a typical 2-wire intelligent system is
shown in Figure 4 and 5. (the monitor module is supervising
the external supply).
Testing
Sensors and bases must be tested after installation and as
an integral part of periodic maintenance. Test the B501BH-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 and 5, reverse the polarity
of the external 24VDC supply. If configured as in Fig-
ure 5, turn on the Intelligent Relay Module. All B501BH-
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 B501BH-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 B501BH-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 B501BH-2
TO ELECTRICAL BOX
4 INCH SQUARE BOX
C0889-00
THIS
NOT THIS
Figure 3:
C0737-00
C0736-00