System Sensor 2112_24AITR Photoelectronic - Manual (Page 2)

D200-85-00 2 I56-1241-03R
TAMPER SLOT
(DEPRESS TAB TO
REMOVE DETECTOR)
TAMPER RESISTANT TAB
(CUT OFF SMALL TAB TO
ACTIVATE TAMPER-RESIST
FEATURE)
ALIGNMENT
ARROWS
Figure 3. 2112/24AITR smoke detector mounting bracket:
A78-2333-01
Wiring Installation Guidelines
All wiring must be installed in compliance with the National Electrical
Code, applicable local codes, and any special requirements of the local
authority having jurisdiction. Proper wire gauges should be used. The
conductors used to connect smoke detectors to control panels and acces-
sory devices should be color-coded to reduce the likelihood of wiring
errors. Improper connections can prevent a system from responding prop-
erly in the event of a fire.
The screw terminal block accepts 14 – 22 gauge wire. For best system per-
formance, all wiring should be installed in separate grounded conduit. Do
not mix fire system wiring in the same conduit as any other electrical
wiring. Twisted pair may be used to provide additional protection against
electrical interference.
Smoke detectors and alarm system control panels have specifications for
allowable loop resistance. Consult the control panel specifications for the
total loop resistance allowed for the control panel being used before
wiring the detector loops.
Wire connections are made by stripping about 1/4 inch of insulation from
the end of the feed wire, inserting the wire into the appropriate terminal,
and tightening the screw to secure the wire in place.
Installation
Where to Install Smoke Detectors
Warning: As a minimum requirement, smoke detectors must be installed
in accordance with the National Fire Protection Agency (NFPA) Standard
72 which defines the standards for the National Fire Alarm Code (National
Fire Protection Association, Batterymarch Park, MA 02269-9101). In addi-
tion, observe all local and national building and electrical codes.
Proper Detector Location:
Figure 1: Recommended smoke detector protection for single-
floor residence with only one sleeping area
Figure 2: Recommended smoke detector protection for single-
floor residence with more than one sleeping area:
NFPA 72, Chapter 2, Section 2-2.1.1.1 states as follows: “Smoke detectors
shall be installed outside of each separate sleeping area in the immediate
vicinity of the bedrooms and on each additional story of the family living
unit, including basements and excluding crawl spaces and unfinished
attics. In new construction, a smoke detector also shall be installed in
each sleeping room.”
The above NFPA standard is a minimum requirement for smoke detec-
tor installation. For better protection, we also require the installation
of a smoke detector inside every bedroom in existing construction.
• Install a minimum of two smoke detectors in any household, no
matter how small it is.
• Put a smoke detector in the hallway outside of every separate bed-
room area. (See Figure 1.) A minimum of two detectors are required
in homes with two bedroom areas. (See Figure 2.)
BEDROOM
SMOKE DETECTORS FOR
MINIMUM PROTECTION
SMOKE DETECTORS FOR
MORE PROTECTION AND
REQUIRED IN NEW CONSTRUCTION
BEDROOM
BEDROOM
LIVING ROOM
DINING
ROOM
KITCHEN FAMILY ROOM
DINING ROOM KITCHEN BEDROOM BEDROOM
BEDROOM LIVING ROOM
SMOKE DETECTORS FOR MINIMUM PROTECTION
SMOKE DETECTORS FOR MORE PROTECTION AND
REQUIRED IN NEW CONSTRUCTION
General Description
Model 2112/24AITR is a 4-wire photoelectronic smoke detector that uses
a state-of-the-art optical sensing chamber. This detector also provides
restorable, 135˚F fixed-temperature heat detection. The photoelectronic
smoke sensor is isolated from the fixed-temperature heat sensor, provid-
ing a self-resetting, local audible smoke alarm that does not alarm at the
panel. Only the fixed-temperature heat sensor will cause the 2112/24AITR
to alarm at the panel and the relay to change its state.
In addition, a piezoelectric horn in each detector produces an interrupted,
85 dBA tone when the individual detector alarms or when the supply volt-
age polarity is reversed.
NOTE: In order for all detectors on a loop to sound when the panel
alarms, the panel must reverse the supply voltage polarity to that
loop upon alarm. For panels that do not reverse the polarity during
alarm, a reversing relay, such as System Sensor’s RR-2, must be
used. The RR-2 is designed to allow all the detectors in the same
loop to sound when one of the detectors goes into alarm. Some pan-
els may require the use of programmable outputs. Refer to System
Sensor literature for further information on the RR-2.
Installation of this detector is simplified by the use of a mounting bracket
and a plug-in screw terminal block that can be prewired to the system,
allowing the detector to be easily installed or removed for cleaning. The
detector’s sensitivity can be tested in place using the MOD400R Test
Module.
An LED on the detector provides a local visual indication of the detector’s
status. If power is applied to the detector and it is functioning normally in
standby within the listed sensitivity range, the status LED blinks every ten
seconds. The LED also latches on in alarm.
If the LED stops blinking, the unit should be removed for maintenance
and inspection.
Mounting
Each 2112/24AITR detector is supplied with a mounting bracket that per-
mits the detector to be mounted:
1. To a single gang box, or
2. Directly to a 3
1 ⁄
2
inch or 4 inch octagonal box, or
3. To a 4 inch square electrical box by using a plaster ring.
4. Directly to the ceiling using drywall anchors, if permitted by local
codes and/or the authority having jurisdiction.
Tamper-resistant Feature
This detector includes a tamper-resistant feature that prevents its removal
from the bracket without the use of a tool. To make the detector tamper-
resistant, remove the smaller tab by breaking it at the scribed line on the
tamper resistant tab on the detector mounting bracket (see Figure 3), then
install the detector. To remove the detector from the bracket once it has
been made tamper resistant, use a small screwdriver to depress the tamp-
er-resistant tab, located in the slot on the mounting bracket, and turn the
detector counterclockwise.
A78-1171-01
A78-1171-02
Figure 2. Surface mounting of 2112/24AITR smoke detector on
3
1 ⁄
2
-inch and 4-inch octagonal box:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
A78-2563-03