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O
PERATION
Note
While in any of the controller mode
setups (temp set, units or calibration
offset), the controller will wait 15
seconds for a value to be entered. If
there is no keypad operation within
the 15-second time window, control
will automatically revert to the tem-
perature display mode and the Mode
LED will turn off.
12
chamber temperature of -17°C and the system begins to
control to the desired temperature of -15°C.
Allow an additional 30 to 40 minutes for the freezer to
again stabilize. If the display is still inaccurate, repeat the
calibration offset procedure.
Hold-Off Time
Following the offset menu is the hold-off (Ho) menu. The
display will momentarily flash "Ho", followed by a number.
The number shown is the delay time in minutes between
compressor activations. Use the UP/DOWN keypads to
change the value.
Increasing the hold-off time will allow additional time for
the evaporator to defrost during the off-cycle. This can
reduce the chance of evaporator freeze-up during times of
high humidity. Pressing the Menu keypad while in the Ho
mode, enters the hold-off time displayed, and returns con-
troller operation to the temperature display mode.
Error Codes
Error codes indicate when the controller is sensing a
problem. A description of each is given below. See the
Troubleshooting Table for additional information on error
codes.
E1
Open sensor.
E2
Under temperature. Temperature at sensor is
less than -36°C.
E3
Over temperature. Temperature at sensor is
greater than 37°C.
Interior Lights
Each cabinet has interior light(s) activated by a door
switch(s). The lights are automatically turned on or off by
opening or closing the door(s). Replace with 40 watt
refrigerator grade bulb.
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