ADEMCO Vista-128FB Setup Guide Page 29

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VISTA-128BP/VISTA-250BP Installation and Setup Guide
3-8
2k EOLR
ZONE 1
SMOKE
(+)
(-)
2-WIRE SMOKE
DETECTOR
10
11
(+)
(-)
Figure 3-10: 2-Wire Smoke Detector on Zone 1
Using 4-Wire Smoke Detectors on Zones 1-8
You may use as many 4-wire smoke detectors as can
be powered from the panel's Auxiliary Power output
without exceeding the output's rating (750mA).
NFPA limits the number of 4-wire smoke
detectors to 18 per zone.
Auxiliary power to 4-wire smoke detectors is
not automatically reset after an alarm, and
therefore must be momentarily interrupted
using either the J7 smoke detector reset
output trigger or a 4204 Relay Module.
Compatible 4-Wire Smoke Detectors
Use any UL Listed 4-wire smoke detector that is rated
for 10-14VDC operation and that has alarm reset time
not exceeding 6 seconds. Some compatible 4-wire
smoke detectors are listed below.
Detector Type Detector Model #
Photoelectric, direct wire System Sensor 2412
Photoelectric w/heat
sensor, direct wire
System Sensor 2412TH
Ionization, direct wire System Sensor 1412
Wiring 4-Wire Smoke Detectors
U
L
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 3-11
).
To wire 4-wire smoke detectors to zones 1-8, perform
the following steps:
Step Action
1 Select 4-wire smoke detectors (see list of
compatible detectors shown previously).
2 Connect detectors (including heat detectors,
if used) across terminals of the zone
selected. All detectors must be wired in
parallel. See Figure 3-11.
NOTE: If you are using the J7 output
trigger to reset the smoke detectors, refer to
Smoke Detector Reset on page 3-20 later in
this section for the 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.
+
+
+
+
+
HEAT
DETECTOR
4-WIRE
SMOKE
DETECTORS
V128BP-002-V0
NO CONNECTION
C
NC
NO
RESET
RELAY 1, 2, 3, OR 4
4204 RELAY MODULE
NOTES:
· PROGRAM THE RELAY TO
TRANSFER ON FIRE ZONE
RESET (ACTIVATION CODE 54).
SEE 4204 RELAY MODULE
SECTION FOR DETAILS.
· SECOND CODE AND OFF
ENTERED AT CONSOLE
MOMENTARILY INTERRUPTS
DETECTOR POWER.
SHOWN POWERED.
RELAY OPENS WHEN
POWER IS LOST.
EOL POWER
SUPERVISION
RELAY MODULE
A77-716B
2k
EOLR
TO
FIRE ZONE
TERMINALS
TO
AUXILIARY
POWER
TERMINALS
Figure 3-11: 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 bell output.
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.
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