Installing 4-Wire Smoke Detectors To Zones 1-8 - ADEMCO VISTA-128B Installation And Setup Gude

Wiring 2-wire Smoke Detectors
To wire 2-wire smoke detectors, perform the following steps:
Step
2
3
•
2K EOL resistors must be used on fire zones (standard 2K EOL resistors may be used on
burglary and panic zones) and must be connected across the loop wires of each zone at the
last detector.
•
The alarm current provided by zone 1 will support only one smoke detector in the alarmed
state.

Installing 4-Wire Smoke Detectors to Zones 1-8

When programmed for fire warning usage, zones 1-8 can monitor 4-wire smoke detectors,
N.O. fire alarm initiating devices, or N.O. sprinkler system supervisory 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 the 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 an external switch or a 4204 Relay Module.
•
Power to 4-wire smoke detectors must be supervised with an EOL device (use a System
U L
Sensor A77-716B EOL relay module connected as shown in Figure 6-3 ).
•
2-wire smoke detectors may not be used in UL installations.
Compatible 4-Wire Smoke Detectors
Use any UL Listed 4-wire smoke detector which is rated for 10-14VDC operation and which
has alarm reset time not exceeding 6 seconds. Some compatible 4-wire smoke detectors are
listed below.
Action
Select from the list compatible 2-wire smoke detectors (up to 16).
Connect 2-wire smoke detectors across zone 1 terminals (10 through 11) as
shown in Figure 6-2. Observe proper polarity when connecting the detectors.
Connect the EOL resistor across the loop wires at the last detector.
Figure 6-2: 2-Wire Smoke Detector Connected to Zone 1.
Photoelectric, direct wire
Photoelectric w/heat sensor, direct wire
Ionization, direct wire
(+)
2-WIRE SMOKE
DETECTOR
(-)
System Sensor 2412
System Sensor 2412TH
System Sensor 1412
Section 6 – Basic Hardwired Zones
(+)
10
11 (-)
6-3