Caron 7403-33 - Manual (Page 17)

7400 Series Operations Manual Rev A 07/25/14 Page 17 of 83
SECTION 4 – OPTIONAL ACCESSORY INSTALLATION
Connecting Alarm Contacts (ALRM302)
With the purchase of ALRM302, a set of terminals on the rear of the unit is provided to
monitor temperature and humidity (controlled humidity option) alarms.
With the alarm contacts, the terminals provided allow for a NO (normally open) output, a
NC (normally closed) and COM (common) connection. In the event of an alarm
condition or power failure, the NO contact will close, and the NC contact will open. Once
the alarm is cleared, the contacts return to their normal conditions. Insert the
appropriate wire into the terminal and tighten down the screw terminal on top of the
connector.
Terminal Connection Unit off Normal Alarm
N/O to C Closed Open Closed
N/C to C Open Close Open