Sub-Zero 700-3 BASE Technical & Service Manual page 25

Integrated
Regulate Refrigerator Zone Temperature (700BR-3)
When the thermistor in the refrigerator compartment reaches high off-set temperature, calling for cooling, the evapo-
rator fan is energized, but the compressor and condenser fan are not allowed to run until the thermistor on the evap-
orator reaches 38°F (3°C). (See Figure 3-21)
If either drawer is opened while the evaporator fan is operating, the microprocessor will detect the power signal to
the lights and cut power to the fan.
Though compartment air temperatures will fluctuate, LCD displays average temperature.
NOTE: If compartment temperature exceeds either high or low offset (Ex: drawer is left open), temperature display
will change by one
degree per minute.
NOTE: If refrigerator
compartment thermis-
tor is faulty, compres-
sor operation defaults
to 20 minutes ON, 40
minutes OFF cycling,
EE appears in left of
LCD, SERVICE will
flash and Error Code
05 will be logged.
NOTE: If evaporator
thermistor is faulty,
the compressor will
not energize until
zone air temperature
exceeds high offset
by 5°F (3°C). SER-
VICE flashes and
Error Code 06 is
logged.
NOTE: When in
Sabbath Mode, the
refrigerator compart-
ment thermistor still
controls compressor
operation, except
there is a random 15
to 25 second delay
before the compres-
sor is energized.
3
(700- BASE)
LOW VOLTAGE SCHEMATIC
DISPLAY
4. Evap Thermistor
above 38°F (3°C).
THERMISTOR UPPER DRAWER/REFRIGERATOR
HIGH VOLTAGE SCHEMATIC
ORANGE
J2
PIN 1
P4
P3
MAIN BOARD
P1
P2
PIN 1
J6
J4
PIN 1
PIN 1
PIN 1
J3
J5
ORANGE W/BLACK STRIPE
ORANGE
Figure 3-21. 700BR-3 Signal Trace - Regulate Refrigerator Zone
Series
MEMBRANE KEYPAD
J2
PIN 1
DISPLAY BOARD
PIN 1
J3
BLUE W/YELLOW STRIPE
THERMISTOR EVAPORATOR
BLUE W/BLACK STRIPE
BLUE W/BLACK STRIPE
115 VOLTS
60 CYCLES
L1 NEUTRAL
WHITE
RED
5. Compressor and
WHITE
condenser fan
BLACK
energized.
PURPLE
ORANGE
UPPER
LIGHT SWITCH
UPPER DRAWER LIGHT
LOWER
LIGHT SWITCH
3-13
Electronic Control System
J2
MAIN BOARD
PIN 1
J6
BLUE
ORANGE
YELLOW
RED
J4
WHITE
PIN 1
BLACK
ORANGE W/YELLOW STRIPE
PIN 1
J5
1. Thermistor at high off-set
temp. calling for cooling.
3. Evap fan energized.
M
RUNNING
REF FAN MOTOR
CAPACITOR
OVERLOAD
PROTECTOR COMPRESSOR
COMPRESSOR
STARTING
M
RELAY
M
CONDENSER FAN
2. No Power
LOWER DRAWER LIGHT
to lights.
#3758424 - Revision B - December, 2005
PIN 1
P4
P3
P1
P2
PIN 1
J3
WHITE
(WHEN
USED)