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Interconnecting Two Battery (DC)
Only Alarms
When interconnecting compatible DC alarms,
location is important. Do not locate alarms on
ceiling joists or other obstructions.
NOTE: Use #18 AWG minimum solid or stranded
wire. When interconnecting, maximum
wire length between any two is 1,500 feet
for #18 AWG or 4,000 feet for #14 AWG
(20 OHMS loop resistance).
1. Follow Steps 1 to 3 in “INSTALLATION FOR
BATTERY (DC) ONLY OPERATION” for alarms
being interconnected.
2. Thread the low voltage wire through the inter-
connect hole drilled in the mounting surface.
Strip off 1/2” of insulation and attach to the
alarm connector with a wire nut.
3. Connect yellow and white wires to the connec-
tor using a wire nut. Connect yellow to yellow
and white to white for proper operation. Do not
connect black wire.
4. Insert the screw anchors into the holes drilled
for the mounting slots. If necessary, gently tap
the anchors with a hammer until they are flush
with the mounting surface. Repeat Steps 2 and
3 with the other Firex alarm.
5. Attach the mounting plate to the mounting
surface with the mounting screws provided.
6. Plug alarm connector into alarm. Feed wire
through hole in mounting surface. Position the
combination smoke and CO alarm on the
mounting plate and turn clockwise to lock the
unit into place.
7. Activate the battery. Remove the arrow tab
and close the battery door. The combination
alarm will beep briefly and the RED light will
flash as the battery door is closed.
8. Test the alarm with both local and interconnect
tests (See TESTING AND MAINTENANCE.)
Installation For AC With
Battery Back-up
DANGER
ELECTRICAL SHOCK HAZARD. Turn off power
at the main fuse box or circuit breaker by
removing the fuse or switching the circuit
breaker to the OFF position.
WARNING
This combination alarm should be installed
only by a qualified electrician. Smoke and
Carbon Monoxide alarm installation must be in
accordance with the requirements of Article
760 of the National Electrical Code and any
local codes that may apply (AC/DC models
only).
THIS COMBINATION ALARM SHOULD BE
INSTALLED IN ACCORDANCE WITH THE NATION-
AL FIRE PROTECTION ASSOCIATION’S STAN-
DARD 72 (National Fire Protection Association, One
Batterymarch Park, Quincy, MA 02269).
• Install combination
alarm on any 4-inch or
single gang junction
box only.
1. Remove mounting
plate from combina-
tion alarm box.
2. Align recessed slots
on plate with mount-
ing holes of any
4-inch or single gang
junction box.
3. Gently pull household wires through center
hole of plate.
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