Electronic Control System
3-2
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Term/Component
Definition / Description
Main Control Board ..………….… (Also referred to as the Main “Controller” Board), is the printed-circuit board (PC Board)
which contains a microprocessor, relays, triacs and electrical connections that monitor
and control all functions of the appliance.
Microprocessor ……….…….…... An electrical component on the control board which receives electrical signals from
other components, processes the information, then sends electrical signals to relays and
triacs on the board to open or close, switching components in the appliance ON or OFF.
Relay ……………………….……. An electrical component on the control board which switches other components in the
appliance ON or OFF when instructed to do so by the microprocessor.
Triac ………………………....…… Similar in function to a relay, the triac is a three terminal semiconductor for controlling
current in either direction.
Control Panel Assembly ……..… (Also referred to as the User Interface Module, or User Interface), is that part of the
electronic control system where all manual input operations are performed.
Function Keys …….….................. The keys or buttons on the control panel assembly used for manual input operations.
The words on the function keys are: “LIGHTS”, “ICE MAKER”, “MAX ICE”, “PURE AIR”,
“COLDER”, “WARMER”, “ALARM” and “POWER”.
Capacitance Touch Sensitive ..… The ability of the keys on the control panel to detect the natural capacitance of the
human body when in close proximity causing a change in electrons state or quantity
which signals the electronic control to perform a function.
LCD (Liquid Crystal Display) …... A semi-liquid substance sandwiched between glass in the control panel assembly. The
molecules of this semi-liquid substance have no specific orientation. However, when
electricity is applied to them, they react predictably, aligning and straightening in such a
way as to control light passage. In doing so, they can be manipulated and arranged to
form the indicators that appear in the LCD.
Indicators .....………………...…... The words, numbers and icons that appear at the LCD.
Fault Codes (Error Codes) ......... The code number indicators that may appear in the LCD when accessing Fault Code
History during Fault and Sensor Recall Mode. This coded data represents current
and/or historical problematic events that specific electronic components may have expe-
rienced.
Temperature Units of Measure…. Temperature readings observed at the LCD may be in Fahrenheit units of measure (°F)
or Celsius units of measure (°C). A series of key strokes allows the temperature units of
measure to be switched to display as either °F or °C.
Set-Point ……………………….... The desired zone temperature, established by pressing the COLDER or WARMER
keys.
High Offset (Cut-in) …………...... As the zone air temperature cycles up and down, the high offset is the maximum zone
temperature that the electronic control system will allow before calling for cooling.
Low Offset (Cut-out)…………...... As the zone air temperature cycles up and down, the low offset is the minimum zone air
temperature that the electronic control system will allow before interrupting cooling.
Thermistor …………………….…. (Also Referred to as a Temperature Sensor), is a resistor with which resistance changes
as the temperature around it changes. For electronic control system purposes, the
microprocessor detects, monitors and processes this resistance value in order to control
the appliance’s cooling functions as well as displays it as a temperature reading in the
LCD.
Variable Speed Compressor …... A compressor designed to run at varying speeds depending on the temperature detect-
ed in the corresponding zone of the appliance.
Variable Speed Fan Motor ...…... A fan motor that is deigned to runs at varying speeds depending on the temperature
detected in the corresponding zone, or the temperature of a specific component.
ELECTRONIC CONTROL TERMINOLOGY & COMPONENT DESCRIPTIONS
The Built-In Series utilizes an electronic control system which monitors, regulates, controls and displays a variety of
functions and operations in the appliance.
The table below defines some of the basic electronic control system terminology.
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