High Voltage - Sub-Zero Built-In Series Assembly

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FUNCTIONS OF THE ELECTRONIC CONTROL SYSTEM
The following pages explain monitoring, regulating and controlling functions of the electronic control system. In most
cases signal traces on a model BI36U wiring schematic are used to show current flow for functions being explained.
Supply Power to the Lighting System
Power is supplied to the lighting system through the control board when the unit is switched ON by pressing the
POWER key. When a door is open, the corresponding normally closed light switch allows power to the lights in the
compartment (See Figure 3-37).
NOTES:
• Power to the light is monitored by the microprocessor to control the door ajar alarm feature.
• Power to the refrigerator lights is also monitored to help control the refrigerator evaporator fan and air purifier fan
operation. When the refrigerator door is open, power to the evaporator fan is interrupted.
• Power to the freezer lights is also monitored to help control the freezer evaporator fan and icemaker operation. If
the freezer door (or drawer) is open, power to the freezer evaporator fan and the icemaker is interrupted.
• If in Sabbath Mode, the lighting system is disabled.
1. Power supplied to
lighting system
unless unit is
switched OFF, or in
Sabbath Mode.
2. Power to the lights
is monitored to help
control alarm, evap-
orator fan, air purifi-
er fan and icemaker
operation.
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Main Menu
Built-In (BI) Series
Built-In (BI) Series

HIGH VOLTAGE

BLACK
WATER FILTER SWITCH
N.O.
NEUTRAL
L1
L1
MAIN LIGHTS
COMP1
COMP2
DEFROST HTR
MAIN
CONTROL
BOARD
Figure 3-37. Signal Trace Schematic: Lighting System
Main Menu Built-In Series Menu
Built-In Series Menu
L1
115 VOLTS
NEUTRAL
60 CYCLES
WHITE/BLUE
FZ DOOR SWITCH
N.C.
YELLOW YELLOW
N.C.
YELLOW BROWN
REF DOOR SWITCH
ORANGE/BLACK
ORANGE
WHITE/BLUE
GRAY/WHITE
BLUE
DEFROST TERMINATOR
3-19
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Electronic Control System
WHITE
ISOLATION VALVE
660 Ω
WATER VALVE
TAN/WHITE
TAN
160 Ω
IM
PINK
CONDENSER FAN MOTOR
M
WHITE/RED
RED/WHITE
AIR FILTER LIGHT
FREEZER LIGHTS
ORANGE/BLACK
ORANGE
REF LIGHTS
CRISPER LIGHTS
FILL-TUBE HEATER
2300-2900 Ω
DEF HEATER
27.9-30.9 Ω
REFRIGERATOR COMPRESSOR
STARTING RELAY
GRAY
FREEZER COMPRESSOR
STARTING RELAY
PURPLE
#7019014 - Revision A - October, 2010
Table of Contents
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