Ohio Medical Corporation., 1111 Lakeside Drive, Gurnee, IL 60031-4099 (800/448-0770) www.ohiomedical.com
Medical Gas Alarm Manual
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255098 (Rev.8) 07/08
Page 18
4.5 Dry Contact Master Alarm Output Connections
CAUTION: When testing the output relays, make all connections with the power off.
Shorting the terminals together while the relay is energized can cause permanent
damage to the relay.
Dry Contact Master Alarm Panel is similar to the Master Alarm Panels except that they also
provide 10 alarm outputs that connect to building management systems. These additional
connections are connected directly to the Dry Contact Master Alarm Panel circuit board at
position “J1” through “J10” as shown in Figure 8B. Each of these pairs of contacts are clearly
marked on the circuit board and includes both positive (+) and negative (-) terminals. The dry
contacts going to the other alarm devices or a building management system must be rated for
at least 12 V
DC
.
Figure 8A:
Wiring from Source Equipment to a
master alarm position
(On either master alarm modules)
Figure 8B:
Wiring from a master alarm Position to a
Building management System
(On Dry Contact Master Modules Only)
Wiring from the source equipment to the second pair of
contacts on the bottom row (MA2) on the master.
Second pair of
contacts on
the top row
(J2) is wired to
a building
management
system
Corresponding
switch to the second
pair of contacts, S2,
on the master
showing “Normally
Closed Circuit Loop”
Maintenance Switch, S11, in
the “ON” position
Input Connection from
Annunciator or previous alarm
module.
Output Connection to the next
master alarm module.