360077-1/O 107
Horizon Series™ - Laboratory, Pharmacy, and International Blood Bank Models
23.2 External Monitoring Devices
CAUTION ► The interface on the remote alarm monitoring system is intended for connection to
the end user’s central alarm system(s) that uses normally-open or normally-closed
dry contacts.
► If an external power supply exceeding 30 V (RMS) or 60 V (DC) is connected to the
remote alarm monitoring system’s circuit, the remote alarm will not function properly;
may be damaged; or may result in injury to the user.
NOTE In the event of a power failure, the power failure alarm condition is transmitted through
the remote alarm contacts.
The remote alarm interface is a relay switch with three terminals:
► Common (COM)
► Normally Open (NO)
► Normally Closed (NC)
Terminals are dry contacts and do not supply voltage. Interface circuit is either normally open or normally
closed, depending on terminals used. Requirements for your alarm system determine which alarm wires
must connect to terminals.
► 0.25 A at 30 V (RMS); 0.25 A at 60 V (DC)
23.2.1 Connect to Remote Alarm Interface
1 Disconnect AC power from the refrigerator. Disconnect the monitoring system backup battery.
2 On the electrical box, locate the remote alarm terminals.
3 Connect remote alarm wires to appropriate terminals, according to requirements for your alarm
system.
4 Use a cable tie to relieve strain on alarm wires (as necessary).
5 Reconnect the refrigerator to AC power. Reconnect the monitoring system backup battery.
6 Press the MUTE button to disable the high temperature alarm while refrigerator reaches operating
temperature.
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