CONTROL PANEL
Using Smoke Power Reversal Module
6
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 bell output.
333 PRM
5
+
–
4-WIRE SMOKE
DETECTORS
+
EOL POWER
SUPERVISION
RELAY MODULE
A77-761B
+
-
-
SHOWN POWERED.
RELAY OPENS WHEN
POWER IS LOST
-2
P1
+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
2
3
4
12
C
333PRM-002-V0
1
NO NC
4204
Figure 3-12b: Wiring a 333PRM using a 4204
CONTROL PANEL
6
7
4
8
333 PRM
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 Figures 3-12a,
b or c. Refer to the 333PRM Installation Instructions
for detailed information on the installation of the
module.
7
6
5
+
3
JUMPER P1 ON
333 MODULE
MUST BE IN
"B" POSITION
P1
–
4-WIRE SMOKE
DETECTORS
4
-
-2
+1
JUMPER
HEAT
DETECTOR
+
EOL POWER
SUPERVISION
RELAY MODULE
A77-761B
+
-
SHOWN POWERED.
RELAY OPENS WHEN
POWER IS LOST
2000
OHM
EOLR
-
1
+
FOUR-WIRE DETECTOR CIRCUIT
2
TO FIRE ZONE
TERMINALS
CONTROL PANEL
4
POWER
SUPPLY
12
8
7
+
USE A 12VDC,
BATTERY-BACKED,
UL LISTED POWER
SUPPLY.
6
–
4-WIRE SMOKE
DETECTORS
4
+
3
-
-2
+1
JUMPER
JUMPER P1 ON
333 MODULE
MUST BE IN
"B" POSITION
HEAT
DETECTOR
+
+
EOL POWER
SUPERVISION
RELAY MODULE
A77-761B
+
-
SHOWN POWERED.
RELAY OPENS WHEN
POWER IS LOST
2000
OHM
EOLR
-
TO FIRE ZONE
TERMINALS
FOUR-WIRE DETECTOR CIRCUIT
333PRM-001-V0
5
Figure 3-12a: Wiring a 333PRM to the Control
Figure 3-12c: Wiring a 333PRM using a 4204 and a
Power Supply
333PRM-003-V0
4204
3
4
NC
MOMENTARY
RESET SWITCH
333 PRM
6
3
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.
P1
7
4
The 333PRM may be used with the System Sensor
2112/24AT and similar models with the required
operating features previously stated.
7
4
8
Smoke Detectors Compatible with the 333PRM
6
7