Sub-Zero 700TC-3 Service Manual page 25

Integrated
Integrated
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.
HIGH VOLTAGE
J5
J7
E2 E7 E10 E6
J3
J1
J2
Figure 3-20. 700TC/I-3 Signal Trace Schematic (High & Low Voltage) of Regulating Temperatures
3
3
(700- T ALL)
(700- T ALL)
FREEZER
Figure 3-19. Average Compartment Temperature Displayed
LOW VOLTAGE
DISPLAY
J6
J5
0
0
PIN 1
PIN 1
PIN 1
J7
0
E2 E7 E10 E6
PIN 1
0 J4
J3
PIN 1
PIN 1 PIN 1
J2
0
J1
0 0
115 VOLTS
L1 NEUT
60 CYCLES
BLACK
WHITE
GRAY
J6
PURPLE
J4
Series
Series Electronic Control System
COLDER WARMER COLDER WARMER
MEMBRANE SWITCH
BLUE W/WHITE STRIPE
REF CAB
BLUE W/WHITE STRIPE
THERMISTOR
BLUE W/BLACK STRIPE
FZR CAB
BLUE W/BLACK STRIPE
THERMISTOR
WHITE
RED
REFRIGERATOR
FAN SWITCH
REFRIGERATOR
COMPRESSOR
M
REFRIGERATOR
OVERLOAD
PROTECTOR
FREEZER
FREEZER
OVERLOAD
COMPRESSOR
PROTECTOR
M
FREEZER
FAN
SWITCHES
PURPLE RED
M
3-11
ICE
REFRIGERATOR
ON/OFF
ON/OFF
Compartments
calling for cooling
(Temp. above high offset)
REFRIGERATOR
FAN MOTOR
M
RUNNING
CAPACITOR
(WHEN USED)
STARTING
RELAY
RUNNING
CAPACITOR
(WHEN USED)
STARTING
RELAY
FREEZER
FAN MOTOR
M
Compressors and
evaporator fans
energized
#3758412 - Revision B - December, 2006
UNIT
ON/OFF