D450-16-01 2 I56-659-06
Installation Guidelines
All wiring must be installed in compliance with all appli-
cable local codes and any special requirements of the local
authority having jurisdiction, using the proper wire sizes.
The conductors used to connect smoke detectors to control
panels and accessory devices should be color-coded to re-
duce the likelihood of wiring errors. Improper connections
can prevent a system from responding properly in the event
of a fire.
For signal wiring (the wiring between interconnected de-
tectors), it is recommended that the wire be no smaller
than 18 gauge (1.0 square mm). However, wire sizes up to
12 gauge (3.3 square mm) can be used with the base. The
use of twisted pair wiring or shielded cable for the power
(+ and -) loop is recommended to minimize the effects of
electrical interference.
If shielded cable is used, the shield connection to and from
the detector must be continuous by using wire nuts, crimp-
ing, or soldering, as appropriate, for a reliable connection.
Alarm system control panels have specifications for allow-
able loop resistance. Consult the control panel specifica-
tions for the total loop resistance allowed before wiring the
detector loops.
Wiring Instructions
W ARNING
The base uses a latching relay that can change states if it is
subjected to mechanical shocks or jarring. As a result, even
though relay contacts are in the open state when the base is
shipped from the factory, the contacts may have closed
during shipment.
Connecting an auxiliary control circuit to closed relay con-
tacts can cause an unexpected, and possibly dangerous, ac-
tivation of that circuit. Therefore, do NOT connect an
auxiliary control circuit to the relay contacts (terminals 1,
2, and 3) before ensuring that the relay contacts are in their
open state. Ensure that the contacts are open by applying
power to the bases WITHOUT the sensor heads installed.
Make wiring connections by stripping about
3
/8" (10 mm)
of insulation from the end of the wire. Then, slide the wire
under the clamping plate and tighten the clamping plate
screw.
SCREWS (NOT
SUPPLIED)
BOX (NOT
SUPPLIED)
DETECTOR
BASE
SNAP ON
DECORATIVE
RING
Figure 1. Mounting the base to an electrical box:
A78-1175-21
Wire the normally open (NO) line to terminal 2 (see Figure
2). Insert the normally closed (NC) line of the relay to ter-
minal 1 and the relay common line to terminal 3. Wire the
communication lines in (+) and out (+)to terminal 4. In-
sert the communication line in (–) and out (–) to terminal
5. Terminal 6 is for shielded cable only (see Figure 2). If
shielded cable is used, the shield connection to and from
the detector must be continuous by using wire nuts,
crimping, or soldering to ensure a reliable connection. If
shielded cable is not used, leave terminal 6 in the screwed-
down position.
Check the zone wiring of all bases in the system before in-
stalling detector heads. This includes checking the wiring
for continuity, correct polarity, ground fault testing, and
performing a dielectric test.
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