D200-63-00
2
I56-931-06
Mounting
Each 1112/24D detector is supplied with a mounting
bracket that permits 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.
Wiring Installation Guidelines
CAUTION
Be certain to observe polarity when wiring.
All wiring must be installed in compliance with the Na-
tional Electrical Code, applicable local codes, and any spe-
cial requirements of the local authority having jurisdiction.
Proper wire gauges should be used. The conductors used to
connect smoke detectors 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.
The screw terminal block accepts 14 – 22 gauge wire. For
best system performance, 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
Figure 3. 1112/24D detector mounting bracket:
ALIGNMENT ARROWS
TAMPER RESISTANT TAB
(CUT OFF SMALL TAB TO
ACTIVATE TAMPER-RESIST
FEATURE)
Figure 2. Surface mounting 1112/24D detector on 3
1
/
2
inch and 4 inch octagonal box:
A78-2563-00
A78-2333-02
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 al-
lowed 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.
Tamper-Resist Feature
This detector includes a tamper-resist 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 in-
stall the detector. To remove the detector from the bracket
once it has been made tamper resistant, use a small screw-
driver to depress the tamper-resistant tab, located in the
Specifications
Diameter:
5.5 inches (140 mm)
Height (including adapter bracket): 1.7 inches (43 mm)
Weight:
5.3 oz. (150 g)
Operating Temperature Range:
32
°
to 120
°
F (0
°
to 50
°
C)
Operating Humidity Range:
10% to 93% Relative Humidity, Noncondensing
Latching Alarm:
Reset by momentary power interruption
Relay Contact Rating–
Resistive Load:
0.1A @ 35VDC
Electrical Ratings
System Voltage nominal:
12 or 24 VDC; 8.5 VDC minimum; 35 VDC maximum
Maximum Ripple Voltage:
30% of nominal voltage (peak to peak)
Reset Voltage:
0.8 VDC minimum
Standby Current:
50
µ
A maximum
Alarm Current:
17 mA typical, 23 mA maximum @ 12V; 19 mA typical, 25 mA maximum @ 24V
Reset Time:
0.3 seconds maximum
Start-up Time:
30 seconds maximum (after 60 second reset)
