All contacts are capable of switching up to 24 volts
AC/DC @ 2 amps. The common (C) and normally closed
(NC) contacts open during an alarm. The common (C)
and normally open (NO) contacts close during and alarm.
The contacts for the Deluxe Remote Alarm are normally
closed and open during and alarm. Figure 4 shows the
location of the remote and deluxe alarm contacts.
Remote alarm contacts are active only with the key switch
in the Alarm Enable position.
Open Sensor
When the controller is unable to read from the sensor, the
display will show SnSr, indicating that a sensor error
exists The display will alternately flash SnSr and HigH.
The audible alarm will sound, the remote alarm contacts
will change state and the over temp LED will illuminate.
Battery Back Up
The Isotemp Plus Alarm Version Refrigerators are sup-
plied with a rechargeable battery back up. The battery
will continue to supply power to the controller and alarm
features in the event of a power outage. A fully charged
battery can continue powering the controller for up to 8
hours during a power failure.
The battery is recharged by the temperature controller
during normal operation. The battery should be checked
every six months and replaced when necessary (see
Replacement Parts). Check the battery by unplugging the
refrigerator and monitoring the controller operation. If the
controller does not properly activate the alarm features for
2 hours, replace the battery. Under normal operation,
the battery back up should last up to four years or 200
charge/discharge cycles.
Calibration Using Temperature
20
C
ONTROLS
