D550-01-01
1
I56-310-03
B501B Plug-in Detector Base
For use with UL Listed detectors:
1551, 2551, 2551T, and 5551
INSTALLATION AND MAINTENANCE INSTRUCTIONS
A Division of Pittway
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
Before Installing
Please thoroughly read the system wiring and installation
manual, and manual I56-407,
Guide for Proper Use of Sys-
tem Smoke Detectors
, which provides detailed information
on detector spacing, placement, zoning, and special appli-
cations. Copies of these manuals are available from System
Sensor or through a System Sensor distributor. (For installa-
tion in Canada, refer to CAN/ULC-S22524-M86, Standard
for the Installation of Fire Alarm Systems and CEC part 1,
Section 32.)
General Description
This plug-in detector base is used with System Sensor
model 1551 ionization, 2551 and 2551T photoelectronic,
and 5551 thermal detectors.
The B501B base is intended for use in a 2-wire intelligent
system, with screw terminals provided for power (+) and
(-), and remote annunciator connections. Communication
takes place over the power (+) and (-) lines. (See note on
page 4).
Specifications
Diameter:
6.1 inches (15.5 cm)
Mounting:
4 inch square box with or without plaster ring; Min. Depth: 1.5 inches.
4 inch Octagon Box; Min. Depth: 1.5 inches.
3-1/2 inch Octagon Box; Min. Depth: 1.5 inches.
Single Gang Box; Min. Depth: 1.5 inches.
Electrical Ratings
Voltage Range:
14.5 to 28 VDC peak
Standby Current (nominal):
150
µ
A at 24 VDC
Power-up Surge at Maximum
Rated Voltage:
1.5 mA-second
LED Current (nominal):
6 mA at 24 VDC
Base Terminals
NO.
FUNCTION
1
POWER (-), REMOTE ANNUNCIATOR (-)
2
POWER (+)
3
REMOTE ANNUNCIATOR (+)
Figure 1. Terminal Layout
A78-1318-00
3
2
1
BASE
TERMINALS
TAMPER PROOF
TAB
