Sub-Zero Built-In Series Assembly

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Electronic Control System
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.
Term/Component
Main Control Board .................. (Also referred to as the Main "Controller" Board), is the printed-circuit board (PC Board)
Microprocessor ....................... An electrical component on the control board which receives electrical signals from
Relay ................................... An electrical component on the control board which switches other components in the
Triac ..................................... Similar in function to a relay, the triac is a three terminal semiconductor for controlling
Control Panel Assembly ........... (Also referred to as the User Interface Module, or User Interface), is that part of the
Function Keys ............................ The keys or buttons on the control panel assembly used for manual input operations.
Capacitance Touch Sensitive ..... The ability of the keys on the control panel to detect the natural capacitance of the
LCD (Liquid Crystal Display) ...... A semi-liquid substance sandwiched between glass in the control panel assembly. The
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
Temperature Units of Measure.... Temperature readings observed at the LCD may be in Fahrenheit units of measure (°F)
Set-Point ............................... The desired zone temperature, established by pressing the COLDER or WARMER
High Offset (Cut-in) .................. As the zone air temperature cycles up and down, the high offset is the maximum zone
Low Offset (Cut-out).................. As the zone air temperature cycles up and down, the low offset is the minimum zone air
Thermistor ............................. (Also Referred to as a Temperature Sensor), is a resistor with which resistance changes
Variable Speed Compressor ...... A compressor designed to run at varying speeds depending on the temperature detect-
Variable Speed Fan Motor ......... A fan motor that is deigned to runs at varying speeds depending on the temperature
#7019014 - Revision A - October, 2010
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Built-In (BI) Series
Built-In (BI) Series
Definition / Description
which contains a microprocessor, relays, triacs and electrical connections that monitor
and control all functions of the appliance.
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.
appliance ON or OFF when instructed to do so by the microprocessor.
current in either direction.
electronic control system where all manual input operations are performed.
The words on the function keys are: "LIGHTS", "ICE MAKER", "MAX ICE", "PURE AIR",
"COLDER", "WARMER", "ALARM" and "POWER".
human body when in close proximity causing a change in electrons state or quantity
which signals the electronic control to perform a function.
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.
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.
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.
keys.
temperature that the electronic control system will allow before calling for cooling.
temperature that the electronic control system will allow before interrupting cooling.
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.
ed in the corresponding zone of the appliance.
detected in the corresponding zone, or the temperature of a specific component.
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