System Sensor B501BHT-2 User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

I56-2814-003R

B501BHT-2
Temporal Tone Sounder Base

Specifications

Base Diameter: 6.0 inches (15.2 cm)
Base Height (less sensor): 2.3 inches (5.9 cm)
Weight: .32 lb. (145 gm)
Operating Temperature Range: 32° to 120°F (0° to 49°C)
Operating Humidity Range: 10% to 93% Relative Humidity

Electrical Ratings

External Supply Voltage: 17 to 32 VDC
Standby Current: 1.0 mA maximum
Alarm Current: 15 mA maximum
Maximum Ripple Voltage: 10% of supply voltage
Start-up Capacitance: 200 µF

Communication/Initiating Loop Supply

Current Draw from Remote Output
of Sensor to turn on Horn: 600 µA maximum
Sound Output: Greater than 90 dBA measured in anechoic room at 10 feet, 24 volts. 85 dBA
minimum measured in UL reverberant room.
Sounder Delay Time: 0.75 to 5.7 sec

Before Installing

Please read the System Smoke Detector Application Guide,
which provides detailed information on sensor spacing. place­ment, zoning, wiring, and special applications. Copies of this
manual are available from System Sensor. NFPA 72 and NEMA
guidelines should be observed.

NOTICE: This manual should be left with the owner/user of
this equipment.

IMPORTANT: The detector used with this base must be tested
and maintained regularly following NFPA 72 requirements.
The detector should be cleaned at least once a year.

General Description

The B501BHT-2 sounder base is used with System Sensor 200
Series sensor heads. Refer to the appropriate manual for more
information on sensors.

The B501BHT-2 incorporates the distinctive three-pulse tempo­ral pattern fire alarm evacuation signal now required by NFPA
72 for commercial and residential applications.

The sounder base is intended for use with intelligent systems.
Refer to the panel manual for the maximum allowable num­ber of units per loop. The sounder base requires an external
24VDC supply with reverse polarity capability or a relay mod­ule configured to reverse the power as in Figure 5. The con­nections for the external supply (terminals 1 and 2) and the
communication loop (terminals 3 and 4) are isolated to pre­vent electrical interaction between them.

A loop of horns can be made to sound by reversing the polar­ity of the external supply when configured as in Figure 4 and

5. When configured as in Figure 5, a loop of horns can also be
made to sound by turning on the Intelligent Relay Module.

NOTE: When not used as a supplementary evacuation system,
the external 24 VDC supply shall be treated as a component of
the main power supply system and shall fall under the require­ments of the main power supply system per NFPA 72.

B501BHT-2 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 B501BHT-2 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 11⁄2 inches deep - 21⁄8 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 drywall or ceiling
tile is allowable.

Wiring Guidelines

All wiring must be installed in compliance with the National
Electrical Code and the local codes having jurisdiction 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 sensors 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.

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: [phone]

www.systemsensor.com

D250-02-00 1 I56-2814-003R

For signal wiring (the wiring between interconnected sensors

5
4

3

2

1

MOUNT B501BHT-2
TO ELECTRICAL BOX

4 INCH SQUARE BOX

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 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 in­stallation temperature.

Wiring Instructions

NOTE: External supply shown in normal standby configura­tion 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 inte­gral 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, there­fore, will be temporarily out of service. Disable the system un­dergoing 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 Intelli­gent 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:

C0736-00

Figure 2. Mounting:

C0891-00

Figure 3:

C0473-00

D250-02-00 2 I56-2814-003R