SNAP ON
DECORATIVE
RING
SCREWS (NOT
SUPPLIED)
DETECTOR
BASE
BOX (NOT
SUPPLIED)
SHORTING
SPRING
A78-1175-01
Figure 1. Mounting Base to Box
MOUNTING
The detector base mounts directly to 3-1/2 inch and
4-inch octagon boxes and 4-inch square boxes, with
or without plaster rings. To mount the base, remove
the decorative ring by rotating it in either direction to
unhook the snaps before separating the ring from the
base. Use the screws supplied with the junction box
to attach the base to the box through the appropriate
slots in the base.
See Figure 1. Position the decorative ring around
the base and rotate it in either direction until the ring
snaps into place.
INSTALLATION GUIDELINES
Allowable loop resistance is an important specification
for control panels as well as for smoke detectors and
their bases. The alarm system cannot be expected
to operate correctly if system components have in-
compatible allowable loop resistances. Therefore,
before beginning installation, refer to the control panel
manufacturer’s loop resistance specification to ensure
that it is listed as compatible with the Notifier base and
smoke detector being installed.
All wiring must be installed in compliance with the
National Electrical Code and all applicable local codes
and any special requirements of the authority hav-
ing jurisdiction, using the proper wire size. The con-
ductors 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.
N550-01-00 2 I56-646-02R
N550-01-00 3 I56-646-02R
NOTE: IF A REMOTE ANNUNCIATOR
IS NOT USED, POLARITY OF
THESE TERMINALS MAY BE
REVERSED.
A78-1175-03
Figure 3A. Activating Tamper-resistance Feature
Figure 3B. Removing Detector Head from Base
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.
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.
2
3
4
1
REMOTE
ANNUNCIATOR
2
3
4
1
REMOTE
ANNUNCIATOR
2-WIRE CONTROL PANEL
E
O
L
CLASS A OPTIONAL WIRING
Figure 2. Wiring Diagram for a Typical 2-Wire Detector System.
this. After the detector base is wired and attached to the electrical box, position the shorting spring against terminal 3.
Use the slot in the retaining clip to hold the spring against the terminal, as shown in Figure 1. This shorts the negative-in
and negative-out leads so that loop wiring can be tested for continuity.
The shorting spring in the base will disengage automatically when the detector head is removed from the base. DO NOT
remove the shorting spring since it reengages as the detector head is turned into the base, completing the circuit.
TAMPER-RESISTANCE FEATURE
NOTE:
DO NOT use the tamper-resistance feature if the XR2 Removal Tool will be used to remove detectors from the
base.
This detector base can be made tamper resistant so that the detector cannot be detached without the use of a tool. To
make the base tamper-resistant, break off the smaller tab at the scribed line on the tamper resistant tab located on the
detector mounting bracket (see Figure 3A), before installing the detector.
To remove the detector from the base after it has been made tamper resistant, remove the decorative ring by rotating it in
either direction and pulling it away from the base. Then, insert a small screwdriver into the notch, as indicated in Figure
3B, and press the plastic lever toward the mounting surface before rotating the detector counterclockwise for removal.
A78-1175-04
For signal wiring (the wiring between interconnected detectors), it is recommended that the wire be no smaller than AWG
18. However, the screws and clamping plate in the base can accommodate wire sizes up to AWG 12. The use of twisted
pair wiring for the power (+ and -) loop is recommended to minimize the effects of electrical interference.
NOTE: To ensure that electrical connections are supervised, do NOT loop wires under terminals 2, 3, and 5 - break the
wire at each terminal.
To make electrical connections, strip approximately 3/8" (1 cm) insulation from the end of each wire. Slide the wires under
the clamp plate and tighten the terminal screw.
Check the zone wiring before installing the smoke detector head. The built-in shorting spring makes it convenient to do
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