D450-04-00 2 I56-375-04R
Base Terminals
No. Function
1Remote Annunciator (+)
2Test Coil (+)
3 Not used
4Remote Annunciator (–)
5RTC (–)
6 N.O. Supervisory Relay
7 N.O Form A Contacts
8 N.O. Alarm Relay
9 N.O. Form A
10 C. Initiation
11 C. Contacts
12 N.O. Alarm Relay
13 N.C. Form C
14 C. Auxiliary Contacts
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 mounting slots in the base.
Position the decorative ring around the base and rotate it in
either direction until the ring snaps into place (please see
Figure 2).
Installation Guidelines
All wiring must be installed in compliance with the
National Electrical Code, all applicable local codes, and
any special requirements of the authority having jurisdic-
tion, using the proper wire size. 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.
For signal wiring (the wiring between interconnected detec-
tors), it is recommended that the wire be no smaller than 16
gauge (1.5 square mm), and that two- or three-conductor
wire be no smaller than 18 gauge (1.0 square mm). For best
performance, alarm loop conductors should be installed in
separate grounded conduit or shielded cable to protect the
alarm loop from extraneous electrical interference.
Smoke detectors and alarm systems control panels have
specifications for allowable loop resistance. Consult the
control panel manufacturer’s specifications for the total
loop resistance allowed for the particular model control
panel being used before wiring the detector loops.
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A78-1175-01
Figure 2. Mounting base to box:
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