12
Part No. 6-847684-00 Rev. D01
Wiring Installation
MEGA2 alarm panels can be ordered in
numerous configurations. The following
rules along with references to this
manual’s schematics clarify wiring
requirements.
• All alarm panels require 100 to 250
VAC 50/60 Hz. power. Refer to
Wiring Schematic 1
(Pg. 14).
• Sensor modules send
pressure/vacuum signals to digital
display modules. If the alarm panel
configuration contains digital display
modules and sensor modules that are
remotely mounted, two conductors are
required between EACH sensor
module and digital display module. A
sensor module can not be wired to
more than one digital display module.
Refer to
Wiring Schematic 2
(Pg. 15).
• Multi-signal modules monitor signals
from dry normally closed switch/relay
contacts. These signals can originate
at source equipment or from pressure
switches mounted on main
pressure/vacuum pipelines. When two
master alarms are required, the same
switch/relay contacts can be wired to
both alarm panels. Two conductors
are required for each alarm panel for
each signal. That is, for any given
signal, two wires will route to first
alarm panel and another two wires will
route to second panel. Both pairs of
wires will originate from switch/relay
contacts. This wiring is duplicated for
each source equipment/pressure
switch signal. Refer to
Wiring
Schematics 3 and 8
(Pgs. 16 and
20).
Determining Number Of Conductors
• Two panels may be connected
together so digital display module
pressure reading(s) of first panel will
be duplicated at second panel. Two
conductors for EACH digital display
module must be routed from first
alarm panel to second alarm panel.
Refer to
Wiring Schematic 4
(Pg. 17).
• If an alarm panel is to be connected to
a Johnson Controls METASYS®
system, two conductors must be
connected between alarm panel’s
annunciator module and monitoring
system’s two-wire data bus. Refer to
Wiring Schematic 9
(Pg. 21).
• Most building automation systems are
capable of monitoring dry normally
closed relay contacts. If alarm panel
is to be connected to this type of
building automation system, two
conductors must be routed from alarm
panel to building automation system
for each signal monitored. Refer to
Wiring Schematics 5,6, and 7
(Pgs.
18 and 19).
