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Electronic Control System
ELECTRONIC CONTROL TERMINOLOGY & COMPONENT DESCRIPTIONS
All 600-2 Series units utilize an electronic control system. The electronic control system monitors, regulates and
controls a variety of functions. The electronic control system also displays temperature readings, ice maker system
operation, possible problems with the unit and door ajar alarm status. The table below defines some basic electron-
ic control system terminology and describes some of the electronic control system components. An understanding
of the following information is needed in order to comprehend the input operations and functions of the electronic
control system.
Term/Component
Control Board ................................The printed-circuit board (PC Board) contains the microprocessor, relays and
Microprocessor .............................. An electrical component on the control board which receives electrical signals
Relay .......................................... The electrical components on the control board which switch other compo-
LCD (Liquid Crystal Display) ............ That part of the control board seen at the control panel which displays com-
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 operations. (The keys
Indicators ...................................... The words and numbers that are displayed at the control panel assembly.
Error Codes .................................. The code numbers accompanied by the letters "EC" that appear on the LCD
Display Units of Measure..................Temperatures displayed at the LCD may be in fahrenheit units of measure
Set-Point ...................................... The desired compartment temperature, established by pressing the COLDER
High Offset (Cut-in)..........................As the compartment air temperature cycles up and down, the high offset is
Low Offset (Cut-out)........................ As the compartment air temperature cycles up and down, the low offset is the
Thermistor (Temperature Sensor) ..... A resistor with which resistance changes as the temperature around it
#3758407 - Revision B - August, 2006
Built-In
Built-In
Definition / Description
electrical connections which control and monitor all functions and operations
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.
nents in the unit ON and OFF when instructed to do so by the microproces-
sor.
partment temperatures, service indicator, door ajar alarm bell & ice indicator.
located at the top of the upper Compartment.
keys used for all input operations to the electronic control system.
are: UNIT ON/OFF, ALARM ON/OFF, ICE ON/OFF, WARMER, COLDER)
(Example: Temperature displays, alarm bell indicator, SERVICE indicator, and
ICE system indicator)
during diagnostic mode if the unit experienced specific problems related to
electrical signals supplied by electrical components.
(°F) or celsius units of measure (°C). A series of key strokes allows the tem-
perature display units of measure to be switched to read as either °F or °C.
or WARMER keys.
the maximum compartment temperature that the electronic control system will
allow before calling for cooling.
minimum compartment air temperature that the electronic control system will
allow before interrupting cooling.
changes. For electronic control system purposes, the microprocessor meas-
ures this resistance and displays it as a temperature reading at the LCD.
3-2
Series
Series
2
2
(600-
)
(600-
)
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Troubleshooting
