Unsupervised Usage Of Zone 1; Wiring 4-Wire Smoke Detectors To Zones 1-8 - ADEMCO VISTA-120 Installation And Setup Manual

Unsupervised
Usage of Zone 1
Wiring 4-Wire
Smoke Detectors
to Zones 1-8
Zone 1 can also be used for normally closed, unsupervised devices by doing the
following:
1. Cut the red jumper on the PC board located above Zone 1.
2. Connect closed circuit devices in series with terminals 10 and 11.
When programmed for fire warning usage, all zones can monitor 4-wire smoke
detectors or N.O. fire alarm initiating devices. 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 (see FINAL POWER UP PROCEDURE
section for auxiliary power ratings).
Auxiliary power to 4-wire smoke detectors is not automatically reset after an alarm
and therefore must be momentarily interrupted using either a normally-closed
momentary switch wired in series with one side of the aux. power to the smokes, or
using a 4204 relay as described below.
Using a 4204 relay allows the detectors to be reset via the second entry of a
Security Code + OFF sequence. The 4204 relay must be programmed to activate
on Zone Type/System Operation 54 (Fire Zone Reset). See RELAY OUTPUTS &
POWERLINE CARRIER DEVICES section for more information.
1. Connect 12 volt power for the detectors from Auxiliary Power terminals 6 and
7 as follows:: Wire the [+] side of Auxiliary Power (Terminal 6) to the N.C.
contact of the 4204 relay. Wire the Center Arm or Pole of the Relay to the [+]
Power side of the smoke detector. Connect the [-] side of the smoke detector to
[-] Aux. Power (Terminal 7).
detectors (see diagram below).
Power to 4-wire smoke detectors should be supervised (use a System Sensor
A77-716-01 EOL relay module connected as shown).
{
RELAY
+
TO
PANEL
ZONE
(ZONE 2-8)
–
TO
{ –
PANEL
AUXILLIARY
+
POWER
(TERMINALS 6, 7)
Figure 10: 4-Wire Smoke Detector Power Reset Using 4204 Relay Module
2. Connect detectors (including heat detectors, if used) across terminals of the
zone selected. All detectors must be wired in parallel. Remove the 2000
ohm EOL resistor if connected across the selected zone terminals. You must
connect the EOL resistor across the loop wires at the last detector.
Observe proper polarity when connecting
+
EOL
–
4-WIRE
SMOKE
–
DETECTOR
NOTES:
• PROGRAMME 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.
+
NO CONNECTION
C NC NO
RESET
RELAY 1, 2, 3 OR 4
4204 RELAY MODULE
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