D450-10-00
3
I56-530-03
Wiring Instructions
NOTE: Refer to the manufacturer’s instructions for releas-
ing device wiring.
NOTE: To ensure that electrical connections are super-
vised, do NOT loop wires under terminals 8, 9, 10,
and 11. Cut the wire at each terminal.
To make electrical connections, strip approximately 3/8" (1
cm) insulation from the end of each wire, slide the bare
wire end under the clamping plate, and tighten the clamp-
ing plate screw. Use the strip gauges molded into the in-
side and underside of the base for ease of wiring to
terminals 1 and 4, and to terminals 6 through 14, respec-
tively.
The zone wiring of the detector base should be checked
before installing the smoke detector heads. The base con-
tains a built-in shorting spring to make this possible. After
the detector base is wired and mounted to an electrical box,
position the shorting spring against terminal 3. This tem-
porary connection energizes the supervisory relay and per-
mits the wiring of the loop to be checked for continuity.
After all detector bases have been mounted, wired, and the
wiring checked, install the detector heads. The shorting
spring in the base automatically disengages when the de-
tector head is removed from the base. DO NOT remove the
APA451
RELEASING
DEVICE
1
6
7
8
9
10
11
12
13
14
2
3
4
5
APA451
RELEASING
DEVICE
1
6
7
8
9
10
11
12
13
14
2
3
4
5
W
N
–
W
N
–
EOL
CONTROL
PANEL
CONTROL
PANEL
ALARM INITIATION LOOP
SPECIFIED
BY PANEL
MANUFACTURER
BLACK LEADS
TRANSFORMER
PRIMARY
24 VACrms/DC
24 VACrms/DC
SPECIFIED
BY PANEL
MANUFACTURER
SUPERVISORY
RELAY
ALARM
RELAY
ALARM
RELAY
SUPERVISORY
RELAY
EOL
NOTE: ABOVE DIAGRAM SHOWS NFPA REQUIRED WIRING OF SUPERVISED
SYSTEMS. SCHEMATIC SHOWN BELOW FOR REFERENCE.
Figure 3. Typical Wiring Diagram for 24VAC rms/DC Detector Systems
A78-1577-09
shorting spring since it reengages as the detector head is
turned into the base, completing the circuit
Tamper-resistance Feature
This detector base also includes an optional tamper-resis-
tant feature that when activated prevents removal of the
detector without the use of a tool.
To make the base tamper resistant, simply break off the tab
on the base (see Figure 4A), before installing the detector.
To remove the detector from the base after it has been
made tamper resistant, insert a small screwdriver (see Fig-
ure 4B) into the small hole and press the plastic lever away
from the detector. Rotate the detector counterclockwise
and remove.
NOTE:
Head removal after activating the tamper-resis-
tance feature first requires removal of the decora-
tive ring.
