Wolf Sub-Zero ICB400 Series Service Manual page 15

Electronic Control System
WINE STORAGE ELECTRONIC CONTROL TERMINOLOGY & COMPONENT DESCRIPTIONS
The electronic control system monitors, regulates and controls a variety of functions; it also displays temperatures,
possible problems with the appliance and the temperature alarm status.
The table below defines some basic electronic control terminology. An understanding of this information is needed
in order to comprehend the operations and functions of the electronic control system.
Term/Component
Control Board ................................The printed-circuit board (PC Board) containing the microprocessor, relays
Microprocessor .............................. An electrical component on the control board which receives electrical signals
Relay .......................................... Electrical components on the control board which switch other components in
LED (Light Emitting Diode) ............... A small electronic "tube" that lights-up when power is supplied to it. In the
Control Panel Assembly .................. The information input and read-out area of the electronic control system,
Membrane Switch .......................... An integral part of the control panel assembly, which consists of the function
Keys (Function Keys) ..................... The buttons on the Membrane switch used for input functions. (The keys are:
Indicators ...................................... The words and numbers that are displayed at the control panel. (Example:
Set-Point ...................................... The desired compartment temperature, established by pressing the COLDER
High Offset (Cut-in)..........................During normal operation of a wine storage unit, it is the maximum evaporator
Low Offset (Cut-out)........................ During normal operation of a wine storage unit, it is the minimum compart-
Offset Temperature Range ............... The difference between the low offset and the high offset.
Thermistor (Temperature Sensor) ..... A resistor with which resistance changes as temperatures around it change.
Display Units of Measure..................Temperatures displayed at the control panel may be in celsius (°C) or, fahren-
Error Codes .................................. The code numbers accompanied by the letters "EC" that appear on the LCD
Electrical "Pulse".................................. A non-constant supply of voltage, or electrical signal, the duration of which is
Electrical Polarity..................................The positive ( + ) and negative ( - ) sides of the alternating current sinewave.
7011544 - Revision A - November, 2008
International W ine Storage
International W ine Storage
Definition / Description
and electrical connections for monitoring and controlling functions and opera-
tions of the unit.
from other components, processes that information, then sends an electrical
signal to the relays on the board to open or close, and other electronic com-
ponents in the unit to switch ON or OFF.
the unit ON and OFF when instructed to do so by the microprocessor.
control panel assembly, LED's are arranged to show values (numbers).
LED's are also used as back-lighting for the indicators in the control panel.
located between the two wine storage compartments. NOTE: The model
ICB427R also has a control panel assembly at top front of the the top refrig-
erator drawer assembly.
keys used for all input functions to the electronic control system.
POWER ON/OFF, LIGHTS ON/OFF, ALARM ON/OFF, COLDER, WARMER)
Temperature displays, temperature alarm, "SERVICE", and error codes.)
or WARMER keys.
temperature the electronic control system will allow before calling for cooling.
ment air temperature the electronic control system will allow before interrupt-
ing cooling.
For electronic control system purposes, the microprocessor measures this
resistance and displays it as a temperature reading at the control panel.
heit (°F), units of measure. Switching from one to the other display units of
measure is accomplished through a series of key strokes.
during diagnostic mode if the unit experienced specific problems related to
electrical signals supplied by electrical components.
often measured in milliseconds.
3-2
Series
Series
(ICB400)
(ICB400)