Sub-Zero UC-24 series

Electronic Control System
Under Counter (UC-24) Series
3-4
#7003933 - Revision B - November, 2007
J2
J6
J4
J5
J3
P2 P1 P3 P4
PIN 1
PIN 1
PIN 1
PIN 1
PIN 1
Figure 3-2. Main Control Board Layout
Figure 3-3. Main Control Board Summary Table
MAIN CONTROL BOARD LAYOUT AND SUMMARY TABLE
Electrical connection points on the main control board are labeled alphanumerically. These labels correspond with
the alphanumeric summary table, located on the wiring diagram. By referencing the summary table, it is possible to
identify which components are connected at which points on the main control board. Below is a layout diagram of
the main control board, and a copy of a model UC-24C summary table. (See Figures 3-2 & 3-3)
NOTES:
• All components on the control board are non-replaceable. If a problem with the control board is identified, the
complete control board must be replaced.
• There is also a small control board in the control panel assembly (Not Shown). All components in the control
panel assembly are non-replaceable. If a problem with the control panel is identified, the complete control panel
assembly must be replaced.
LOW VOLTAGE THERMISTOR CIRCUITS
120 VOLT CIRCUITS
MAIN CONTROL BOARD SUMMARY
J3-3
P3
P2
P1
J3-1
J3-2
J3-6
J3-4
J5-5,6
J3-5
J2-1
J3-7
J2-4
J2-3
J2-2
P4
J5-1,2
J4-5
J5-3,4
J5-7
J6-2
J6-1
J5-8
J4-2
J4-1
J6-3
J4-4
J4-3
J4-6
TERMINAL
N
C
O
EVAP
EVAP
DISPLAY
DISPLAY
DISPLAY
DISPLAY
LIGHTS
FAN 1
COMPRESSOR
L1
LN
CAB
DEFROST
ICE
FAN 2
R DOOR
DEF
ICE
CAB
CIRCUIT
NOT USED
NOT USED
REF DOOR LIGHT SENSE
NOT USED
NOT USED
NEUTRAL
NOT USED
EVAPORATOR FAN
DEFROST HEATER
COMPRESSOR
POWER IN
LIGHTS
FREEZER COMPARTMENT
DEFROST SENSOR
NOT USED
NOT USED
REF COMPARTMENT
DISPLAY WIRING
EVAPORATOR
DISPLAY WIRING
DISPLAY WIRING
DISPLAY WIRING
EVAPORATOR
BAFFLE CLOSE
BAFFLE OPEN
BAFFLE NEUTRAL
DESCRIPTION
12VDC POWER SUPPLY FOR DISPLAY BOARD
GROUND FOR DISPLAY BOARD POWER SUPPLY
SERIAL DATE TRANSMIT
SERIAL DATA RECEIVE
SENSES EVAPORATOR TEMPERATURE
SENSES IF LOWER DOOR OPEN
POWERS COMPRESSOR AND CONDENSER FAN
SENSES EVAPORATOR TEMPERATURE
POWERS EVAPORATOR FAN
POWER INTO BOARD
NEUTRAL INTO BOARD
POWERS LIGHTS
SENSES REF CABINET TEMPERATURE
BAFFLE NEUTRAL
PULSED TO CLOSE NEUTRAL
PULSED TO OPEN NEUTRAL
POWERS DEFROST CIRCUIT
SENSES WHEN DEFROST HEATER SHUTS OFF
SENSES FREEZER CABINET TEMP
FUNCTION
WHITE
PURPLE
COLOR
BLACK
RED
YELLOW
ORANGE
ORANGE
BLUE/RED
WHITE
YELLOW
ORANGE/RED
RED
BLUE/BLACK
YELLOW/RED
YELLOW/BLACK
YELLOW/WHITE
BLUE
GRAY/WHITE
BLUE/WHITE