Sub-Zero 700-3 BASE Technical & Service Manual page 27

Integrated
Monitor and Control Refrigerator Fan-Assisted, Off-Cycle Defrost (700BR-3)
Temperature signals from refrigerator evaporator's thermistor's are observed by the microprocessor. During off cycle
defrost, if a refrigerator zone temperature reaches high offset (calling for cooling) before evaporator temperature
rises to 38°F (3°C), no power will be supplied the the compressor. But, the the zone evaporator fan will switch ON.
Once the evaporator temperatur reaches 38°F (3°C), normal cooling functions begin. (See Figure 3-23).
NOTE: If refrigerator compartment thermistor is faulty, compressor 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). SERVICE 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. When Evap
Thermistor rises
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
3-15
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)