System Sensor 2112_24S and 2112_24TS Photoelectric User Manual

Page 2

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D200-62-00

I56-932-12R

Mounting
Each 2112/24S and 2112/24TS 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

-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 permit-

ted by local codes and/or the authority having jurisdic-
tion.

Tamper-resistant Feature
This detector includes a tamper-resistant feature that pre-
vents 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 2), then
install 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
slot on the mounting bracket, and turn the detector coun-
terclockwise.

Wiring Installation Guidelines
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

Figure 1. Surface mounting of 2112/24S smoke

detector on 3

-inch and 4-inch octagonal box:

;;;;;;;;;;;;;;;;;;;;;;;;

A78-2563-00

Figure 2. 2112/24S and 2112/24TS smoke detector mounting bracket:

A78-2333-01

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 al-
lowed for the control panel being used before wiring the
detector loops.

Wire connections are made by stripping about

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

WARNING

Remove power from the control unit or initiating device cir-
cuits before installing detectors.

1. Wire the plug-in screw terminal block per Figure 3 and

plug the terminal block into the detector.

2. Align the arrows on the detector with the arrows on the

mounting bracket.

3. Turn the detector clockwise in the mounting bracket un-

til it clicks into place.

4. After all detectors have been installed, apply power to

the control unit or initiating device circuits.

5. Test the detector as described in TESTING. (See page 3.)
6. Reset the detector at the system control panel.
7. Notify the proper authorities the system is in operation.

CAUTION

Dust covers are an effective way to limit the entry of dust
into smoke detector sensing chambers. However, they may
not completely prevent airborne dust particles from enter-
ing the detector. Therefore, System Sensor recommends the
removal of detectors before beginning construction or other
dust producing activity. Be sure to remove dust covers from
any sensors that were left in place during construction as
part of returning the system to service.

TAMPER SLOT
(DEPRESS TAB TO
REMOVE DETECTOR)

TAMPER RESISTANT TAB
(CUT OFF SMALL TAB TO
ACTIVATE TAMPER-RESIST
FEATURE)

ALIGNMENT
ARROWS

C OVER

REMOVAL

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