Caron 7304 - Manual (Page 15)

7300 Series Operations Manual Rev A 3/26/2014 Page 15 of 80
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, humidity (optional), co2 (optional) 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