Wiring 4-Wire Smoke Detectors Power to 4
Wiring 4-Wire Smoke Detectors
UL
To wire 4-wire smoke detectors to zones 1-8, perform
the following steps:
Power to 4-wire smoke detectors must be
supervised with an EOL device (use a System
Sensor A77-716B EOL relay module connected
as shown in Figure 3-10).
N.O.
7
POLE
8
N.C.
9
Aux. Pwr 1
10
Step
Action
1
Select 4-wire smoke detectors (see list of
compatible detectors shown previously in
this section).
2
Connect detectors (including heat detectors,
if used) across terminals of the zone
selected. All detectors must be wired in
parallel. See Figure 3-10.
NOTE: If you are using the J2 output
trigger to reset the smoke detectors, refer to
Smoke Detector Reset later in this section for
the wiring instructions. If you are using the
auxiliary relay to reset the smoke detectors,
refer to Installing the Auxiliary Relay
previously in this section for wiring
instructions.
3
Connect the EOLR at the last detector in the
loop across the zone’s terminals. You must
connect the EOLR across the loop wires
at the last detector.
AUXILIARY RELAY
+
+
11
Keypad Prt 1 12
BLK
-
–
•
4-WIRE SMOKE
DETECTORS
+
+
-
•
+
EOL
POWER
SUPERVISION
RELAY
MODULE
A77-716B
-
CONTROL
PANEL
ZONE
TERMINALS
(15-27)
+
2000
OHM
EOLR
HEAT
DETECTOR
-
4_wiresmk-005-V0
SHOWN POWERED.
RELAY OPENS WHEN
POWER IS LOST
Figure 3-10: 4-Wire Smoke Detectors
Using Smoke Power Reversal Module
The 333 PRM Polarity Reversing Module is used to
reverse the polarity of the positive and negative
voltages powering smoke detectors. The module is for
use with 4-wire smoke detectors that employ a sounder
and voltage-reversing feature. The module is triggered
by a pulsing Notification Appliance Circuit.
Smoke Detectors Compatible with the 333PRM
The 333PRM may be used with the System Sensor
2112/24AT and similar models with the required
operating features previously stated.
The 333PRM reverses polarity to smoke
detectors with Integral Temp-3 Sounders.
Typically, in alarm, each draws 49-60mA of
current. The control panel supplies only enough
current for one smoke detector. In order to
attach more than one, an external power
supply and an external relay may be required.
Installing the 333 PRM
Mount the 333 PRM inside the control panel’s cabinet
or in a separate cabinet using the double-sided tape
provided. Wire the 333PRM as shown in Figure 3-11 or
Figure 3-12. Refer to the 333PRM Installation
Instructions for detailed information on the installation
of the module.
CONTROL PANEL
12
10
9
5
8
333 PRM
8
7
6
+
EOL POWER
SUPERVISION
RELAY MODULE
A77-761B
+
3
P1
+
–
4-WIRE SMOKE
DETECTORS
4
-
-
SHOWN POWERED.
RELAY OPENS WHEN
POWER IS LOST
-2
+1
2000
OHM
EOLR
JUMPER
HEAT
DETECTOR
JUMPER P1 ON
333 MODULE
MUST BE IN
"B" POSITION
+
-
FOUR-WIRE DETECTOR CIRCUIT
TO FIRE ZONE
TERMINALS
333PRM-004-V0
5
Figure 3-11: Wiring a 333PRM to the Control
CONTROL PANEL
8
12
10
5
333 PRM
8
7
6
5
+
3
EOL POWER
SUPERVISION
RELAY MODULE
A77-761B
+
-
-
-2
+1
JUMPER
HEAT
DETECTOR
JUMPER P1 ON
333 MODULE
MUST BE IN
"B" POSITION
+
+
SHOWN POWERED.
RELAY OPENS WHEN
POWER IS LOST
2000
OHM
EOLR
-
TO FIRE ZONE
TERMINALS
FOUR-WIRE DETECTOR CIRCUIT
+
USE A 12VDC,
BATTERY-BACKED,
UL LISTED POWER
SUPPLY.
Figure 3-12: Wiring a 333PRM using a Power Supply
333PRM-005-V0
P1
–
4-WIRE SMOKE
DETECTORS
4
POWER
SUPPLY
9
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