Sub-Zero UC-24 series Service Manual page 3

Under Counter (UC-24) Series
ELECTRONIC CONTROL SYSTEM OVERVIEW
Below is the wiring schematic for the model UC-24C, illustrating the components of the electronic control system.
• Manual input operations are performed at the control panel (membrane keypad).
• Temperatures and possible problems with the unit will appear in the control panel display.
• Monitoring, regulating and controlling functions take place at the main control board.
The entire electronic control system is described in greater detail on the following pages.
NOTE: For more detailed electrical diagrams refer to the wiring diagram and schematic supplied with the unit.
LOW VOLTAGE SCHEMATIC
THERMISTOR CABINET/FREEZER
HIGH VOLTAGE SCHEMATIC
ORANGE
MAIN BOARD
J6
J4
J5
REF AIR DUCT BAFFLE
MEMBRANE KEYPAD
DISPLAY
PIN 1
DISPLAY BOARD
THERMISTOR
EVAPORATOR
THERMISTOR CABINET/REF
115 VOLTS
60 CYCLES
L1
GRAY/WHITE
J2
WHITE
P4
PIN 1
BLACK
P3
PURPLE
P1
BLUE
P2
PIN 1
PIN 1
PIN 1
PIN 1
J3
ORANGE
Figure 3-1. UC-24C Wiring Schematic
YELLOW W/WHITE STRIPE
YELLOW W/BLACK STRIPE
YELLOW W/RED STRIPE
J2
PIN 1
J3
WHITE
BLUE W/RED STRIPE
ORANGE W/RED STRIPE
BLUE W/WHITE STRIPE
BLUE W/WHITE STRIPE
BLUE W/BLACK STRIPE
BLUE W/BLACK STRIPE
NEUTRAL
WHITE
OVERLOAD
PROTECTOR
GRAY/WHITE
CONDENSER FAN
RED
DEFROST HEATER
R55 OHMS
ORANGE
REF LIGHT SWITCH
REF (TOP) LIGHT
THERMAL
FUSE ICEMAKER
BLACK WHITE
TAN
3-3
Electronic Control System
J2
PIN 1
MAIN BOARD
PIN 1
J6
ORANGE
YELLOW J4
RED
PIN 1
PIN 1
J5
RUNNING
CAPACITOR
COMPRESSOR
COMPRESSOR
STARTING
M
RELAY
WHITE
M
REF FAN MOTOR
M
ICEMAKER
VALVE
WHITE
R160 OHMS
#7003933 - Revision B - November, 2007
P4
P3
P1
P2
PIN 1
J3
WHITE
(WHEN
USED)
WHITE
WHITE
WHITE
WHITE