System Sensor B501BHT specifications Wiring Instructions, Testing

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 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 inte- gral part of periodic maintenance. Test the B501BHT 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 as in Figure 5, turn on the Intelligent Relay Module. All B501BHT bases on the loop should sound in approximately 10 seconds.

2.Latch the sensor LED on from the control panel. That unit’s B501BHT should sound in approximately 10 seconds.

NOTES:

1.There is approximately a 10 second delay built into the B501BHT before sounding. This delay is present whether the control signal comes from the sensor or from the exter- nal 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 4 seconds. Therefore, it is neces- sary to complete testing of each sensor within this 4-sec- ond limit to prevent the horn from sounding.

Figure 1. Terminal layout:

C0471-00

Figure 2. Mounting:

MOUNT B501BHT

TO ELECTRICAL BOX

4 INCH SQUARE BOX

C0472-00

Figure 3:

C0473-00

D550-06-00 2 I56-1367-004R