6200 series Operations Manual
Rev D 2/14/2012
Page 16 of 60
SECTION 4 – ACCESSORY INSTALLATION
Connecting Alarm Contacts (ALRM301)
With the purchase of ALRM301, a set of terminals on the rear of the unit is provided to
monitor temperature and humidity (6220 & 6240 only) 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
