Integrated
Integrated
(700-
(700-
3
3
T
T
ALL)
ALL)
Series
Series
Electronic Control System
3-11
#3758412 - Revision B - December, 2006
Monitor, Regulate and Display Compartment Temperatures
The temperature signal from the compartment thermistor is monitored by the microprocessor and then displayed on
the LCD. Though the compartment air temperature does fluctuate, the LCD displays the average temperature (See
Figure 3-19). When the compartment temperature reaches high offset, the microprocessor supplies power to the
compressor and evaporator fan (See Figure 3-20). As the compressor and evaporator fan run, the compartment
temperature drops. When the compartment temperature reaches low offset, the microprocessor interrupts power to
the compressor and evaporator fan, cycling them off.
NOTE:
If the average compartment temperature changes, the temperature displayed on the LCD will change by one
degree per minute.
Figure 3-19. Average Compartment Temperature Displayed
UNIT
ICE
REFRIGERATOR
ON/OFF
ON/OFF
ON/OFF
WARMER
COLDER
FREEZER
WARMER
COLDER
J6
J5
J3
E2
E7 E10 E6
J2
J1
J7
J4
J5
J7
J3
J2
E2
E6
E10
E7
J1
J4
LOW VOLTAGE
J6
HIGH VOLTAGE
FREEZER
OVERLOAD
PROTECTOR
NEUT
115 VOLTS
60 CYCLES
L1
REFRIGERATOR
OVERLOAD
PROTECTOR
FREEZER
FAN
SWITCHES
FREEZER
COMPRESSOR
STARTING
RELAY
FREEZER
FAN MOTOR
RUNNING
CAPACITOR
REFRIGERATOR
COMPRESSOR
REFRIGERATOR
FAN SWITCH
REFRIGERATOR
FAN MOTOR
WHITE
GRAY
BLACK
PURPLE
WHITE
PURPLE
RED
RED
STARTING
RELAY
RUNNING
CAPACITOR
MEMBRANE SWITCH
DISPLAY
BLUE W/WHITE STRIPE
BLUE W/WHITE STRIPE
BLUE W/BLACK STRIPE
BLUE W/BLACK STRIPE
FZR CAB
THERMISTOR
REF CAB
THERMISTOR
(WHEN USED)
(WHEN USED)
M
M
M
M
M
PIN 1
PIN 1
PIN 1
0
PIN 1
0
0
0
PIN 1
PIN 1
PIN 1
0
0
0
Compartments
calling for cooling
(Temp. above high offset)
Compressors and
evaporator fans
energized
Figure 3-20. 700TC/I-3 Signal Trace Schematic (High & Low Voltage) of Regulating Temperatures