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C
ONTROLS
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
Offset
In the event the refrigerator needs to be calibrated, a sim-
ple routine is available to adjust the display and control
point to a referenced standard. To set a temperature off-
set while in the Control Mode (mode LED off), simply
press and hold the Menu key for 5 seconds. The display
will flash oS followed by the last temperature offset value.
The factory setting is 0.0. To change the offset value,
press the Increase or Decrease keypad to the value
which when algebraically added to the last displayed tem-
perature, will agree with the reference temperature. Next,
press the Menu key until the Mode LED turns off.
For Example:
The display indicates 4°C but a reference thermometer in
the refrigerator chamber indicates 6°C. The operator
presses and holds the Menu KEY until the display shows
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