Sentrol ZX400 Installation Manual - “2 In 1” Zoning
9
Method 2 wires two separate zone loops back into
one set of terminals. The panel recognizes each
loop independently because two different EOL re-
sistor values are used to differentiate between the
Primary Zone (1500 Ohm 1/2 Watt) and the Sec-
ondary Zone (825 Ohm 1/4 Watt). This method
provides two zones with one set of terminals and is
ideal for pre-wire or already installed wiring.
Figure 4 “2 in 1” Zoning™ Wiring - Method 2
The resistors in Figure 3 & 4 are 1%
values to maintain proper loop resis-
tance values. If replacements are re-
quired, please refer to the manufac-
turer for correct replacements. The
1500 ohm resistor is color coded
Brown•Green•Black•Brown•Brown.
The 825 ohm resistor is color coded
Gray•Red•Green•Black•Brown.
All zones sense five different voltage levels enabling
one zone to act as two. Troubleshooting is simple
using just a voltmeter at the control. The control
monitors the voltage level across the zone and uses
the voltage levels in Table 1 to determine whether
the zone is normal, open, or shorted.
If a Normally Open Device (i.e., 4-wire
smoke detector) is used with “2 in 1”
Zoning™, a short will occur across
both zone loops when that device
goes into alarm. It is recommended
that these types of devices be used
with Conventional Zone wiring only.
The Sentrol ZX400/ZX410 Security Control intro-
duces an all new method of wiring zones that saves
both time and wire costs. “2 in 1” Zoning™ allows
the installer to wire two separate zones in parallel
into one set of terminals.
Each zone is uniquely identified by its end-of-line re-
sistor. The Primary Zone (zones 1-6) in each termi-
nal is identified by a 1500 Ohm EOL resistor. The
Secondary Zone (zones 7 - 12) is identified by an
825 Ohm EOL resistor. The Primary and Secondary
zones operate as two independent zones to provide
separate reporting, programming, and displays. Each
zone is fully programmable as described in the
ZX400/ZX410 Programming Manual. The zones are
for Form A, Form B, or Form C sensors. Maximum
total loop wire and contact resistance (not includ-
ing EOL) must not exceed 100 Ohms for the loop
to function properly.
There are two methods of wiring for “2 in 1” Zon-
ing™. Method 1 wires one zone loop back to the
control while a second zone loop is added in parallel
off the first. This method may be employed in sys-
tem retrofits, system expansions, or just simply to
save wire cost and labor.
Figure 3 “2 in 1” Zoning™ Wiring - Method 1
NOTE
Secondary Zone
825
Ω
1/4W
1500
Ω
1/2W
Primary Zone
Secondary Zone
825
Ω
1/4W
1500
Ω
1/2W
Primary Zone
“2 in 1” Zoning
™
NOTE
“2 in 1” Zoning™