Electronic Control System
600 Series
(Prior to #1810000)
3-2
#3756270 - Revision B - January, 2006
ELECTRONIC CONTROL TERMINOLOGY & COMPONENT DESCRIPTIONS
All 600 Series units utilize an electronic control system. The electronic control system monitors, regulates and con-
trols a variety of functions, as well as displaying temperatures and possible problems with the unit. In this section,
some basic electronic control system terminology is defined, and electronic control components described. An
understanding of the following information is needed in order to comprehend the electronic control system.
TERM / COMPONENT DEFINITION / DESCRIPTION
Control Board The electronic board which contains the microprocessor, relays, electrical connec-
tions and LCD. The electrical hub of the electronic control system.
NOTE: See "Control Board Summary / Layout" in following section.
Microprocessor An electrical component on the control board which receives electrical signals from
other components in the electronic control system, processes that information, and
then sends an electrical signal to the relays instructing them to open or close, and
other electronic components to switch on or off.
Relay The electrical components on the control board which, when closed, allow power to
the appropriate components.
LCD (Liquid Crystal Display) That part of the control board seen at the control panel which displays compartment
temperatures, service indicators, etc...
Control Panel The information input and read-out area of the electronic control system. The LCD
is visible through a window on the control panel.
Membrane Switch That part of the upper control panel where all input functions are performed.
Keys Buttons on the Membrane switch used for input functions.
Indicators The words that are displayed on the LCD.
Set-Point The desired compartment temperature. This is the approximate average of the high
offset and the low offset.
High Offset The maximum compartment air temperature the electronic control system will allow.
When the high offset is reached, power is supplied to the compressor to run.
Low Offset The minimum compartment air temperature the electronic control system will allow.
When the Low Offset is reached, power to the compressor is interrupted.
Offset Temperature Range The difference between the low offset and the high offset.
Thermistor A resistor with which resistance changes as the temperature around it changes. For
electronic control system purposes, the microprocessor deciphers this resistance
signal as temperature.
(Temperature Sensor)
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