Model 427R-2 Refrigerator Section Basic Input Operations; Adjusting Set-Point (Temperature Adjustments) - Sub-Zero 424HAG/O-2 Service Manual

Electronic Control System

MODEL 427R-2 REFRIGERATOR SECTION BASIC INPUT OPERATIONS

The following few pages describe the basic input operations performed at the 427R-3 control panel (switching unit
ON/OFF; adjusting set-point (temperature adjustment); switching ice maker system ON/OFF and enabling and dis-
abling door ajar alarm feature). Please note that though possible to display temperatures in Fahrenheit or Celsius,
in most cases Fahrenheit readings are shown.
Unit ON/OFF
All units are shipped in OFF Mode. When power is supplied to the unit, a trace of the word "OFF" is visible on the
LCD. By pressing the UNIT ON/OFF key (See Figure 3-46), power is allowed past the control board to the rest of
the unit. This will be indicated by the unit lights and LCD energizing.
NOTE: Whenever the unit is switched OFF using the UNIT ON/OFF key, a trace of the word "OFF" will be visible on
the LCD as long as power is supplied to the unit. This differs in Sabbath Mode, which will be covered later.
WHEN IN OFF MODE, 115 VOLTS AC IS STILL PRESENT AT CONTROL BOARD.

Adjusting Set-Point (Temperature Adjustments)

To adjust set-points, press WARMER or COLDER key on control panel in multiple key strokes until the desired set-
point is achieved. One key stroke equals one degree change (Fahrenheit or Celsius). (See Figure 3-47)
NOTE: Temperature range is +34°F (+1°C) to +45°F (+7°C), with initial set-point of +38°F (+3°C).
NOTE: The initial stroke of the WARMER or COLDER keys will change previous set-point by one degree.
NOTE: The set-point will be displayed on the LCD for ten (10) seconds after the last WARMER or COLDER key
stroke. After the ten (10) second delay, the zone temperature will be displayed. As the zone temperature changes,
the temperature displayed on the LCD will change by no more than one degree per minute.
Figure 3-47. Adjusting Set-Point - Press WARMER or COLDER Key In Multiple Key Strokes
#3758410 - Revision C - May, 2014
Wine Storage
Wine Storage
REFRIGERATOR
Figure 3-46. Unit ON/OFF - Press UNIT ON/OFF Key
REFRIGERATOR
(400-
(400-
COLDER WARMER
COLDER WARMER
3-26
Series
Series
2
2
)
)
UNIT
ON/OFF
ON/OFF
UNIT
ON/OFF
ON/OFF