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WIRING INSTRUCTIONS

Make wiring connections by stripping about 

3

/

8

" (10 mm) of insulation from 

the wire end. Then, insert the wire into the appropriate terminal and tighten 
the screw. Wire the communication line in (+) to terminal 1. Insert both 
communication line in (–) and communication line out (–) to terminal 2. Wire 
communication line out (+) to terminal 3 (see Figures 3 and 4).
A label is affixed to the base for recording the zone, address, and type of 
detector being installed at the base location. This information is useful for set-
ting the detector head address and for verification of the sensor type required 
for that location.
Once all detector bases have been wired and mounted, and the loop wiring 
has been checked, the detector heads may be installed in the bases.

TAMPER-RESIST FEATURE

NOTE:

 Do not use the tamper-resist feature if the removal tool is to be used.

This detector base includes a tamper-resist feature that prevents its removal 
from the base without the use of a tool. 
To activate this feature, break the tab from the detector base as shown in 
Figure 5A. Then, install the detector.
To remove the detector from the base once the tamper-resist feature has been 
activated, insert a small-bladed screwdriver into the slot from the top and 
press down on the lever (see Figure 5B). This allows the detector to be rotated 
counterclockwise for removal.
The tamper-resist feature can be defeated by breaking and removing the plas-
tic lever from the base. However, this prevents the feature from being used 
again.

Please refer to insert for the Limitations of Fire Alarm Systems

THREE-YEAR LIMITED WARRANTY

System Sensor warrants its enclosed smoke detector base to be free from defects in ma-
terials and workmanship under normal use and service for a period of three years from 
date of manufacture. System Sensor makes no other express warranty for this smoke 
detector base. No agent, representative, dealer, or employee of the Company has the au-
thority to increase or alter the obligations or limitations of this Warranty. The Company’s 
obligation of this Warranty shall be limited to the replacement of any part of the smoke 
detector base which is found to be defective in materials or workmanship under normal 
use and service during the three year period commencing with the date of manufacture. 
After phoning System Sensor’s toll free number 800-SENSOR2 (736-7672) for a Return 
Authorization number, send defective units postage prepaid to: Honeywell, 12220 Rojas 

Drive, Suite 700, El Paso TX 79936, USA. Please include a note describing the malfunc-
tion and suspected cause of failure. The Company shall not be obligated to replace units 
which are found to be defective because of damage, unreasonable use, modifications, 
or alterations occurring after the date of manufacture. In no case shall the Company 
be liable for any consequential or incidental damages for breach of this or any other 
Warranty, expressed or implied whatsoever, even if the loss or damage is caused by the 
Company’s negligence or fault. Some states do not allow the exclusion or limitation of 
incidental or consequential damages, so the above limitation or exclusion may not apply 
to you. This Warranty gives you specific legal rights, and you may also have other rights 
which vary from state to state.

(+)

(–)

(–)
(+)

(–)
(+)

(+)

(–)

(–)
(+)

(–)
(+)

3 (+)

2 (–)

2 (–)

1 (+)

2 (–)

1 (+)

3 (+)
2 (–)

(+)

(–)

(–)
(+)

(+)

(–)

(–)
(+)

2 (–)

2 (–)

3 (+)

1 (+)

2 (–)

2 (–)
3 (+)

1 (+)

(+)

(–)

COMMUNICATION LINE

ALL WIRING SHOWN IS SUPERVISED.

A PAIR OF FAULT ISOLATOR BASES WILL 

DISCONNECT A GROUP OF DEVICES IF A 

SHORT CIRCUIT OCCURS ON THE SIGNALING 

LINE CIRCUIT WITHIN THAT GROUP.

GROUPS OF ADDRESSABLE DEVICES ARE 

SEPERATED BY FAULT ISOLATOR BASES. ANY 

COMBINATION OF COMPATIBLE LISTED DEVICES 

MAY BE MIXED WITHIN A GROUP

COMPATIBLE 

CONTROL PANEL

GROUP 1

GROUP 2

GROUP 3

C1013-01

FIGURE 4. WIRING DIAGRAM

FIGURE 5A. ACTIVATING THE TAMPER-RESIST FEATURE

PLASTIC LEVER

BREAK TAB AT DOTTED LINE BY 

TWISTING TOWARD CENTER OF BASE.

USE SMALL-BLADED SCREWDRIVER TO PUSH 

PLASTIC LEVER IN DIRECTION OF ARROW.

C1065-00

FIGURE 5B. REMOVING THE DETECTOR HEAD FROM THE BASE

SLOT

SLOT

C1082-00

System Sensor® is a registered trademark of Honeywell International, Inc.

NOTE:

 B224BI-WH and B224BI-IV replace the previous model number 

B224BI; all are functionally the same.

  2 

I56-3736-005 

  

©2018 System Sensor. 02/01/2018

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