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Sub-Zero Built-in Series Assembly

Sub-Zero Built-in Series
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Electronic Control System
3-27
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Additional Regulating of Freezer Compartment Temperatures:
Details of Controlling the Freezer Variable Speed Evaporator Fan Motor
During normal operation and when the door is closed, the variable speed evaporator fan motor in the freezer zone is
supplied with 12V DC at all times from P2-14 off of the control board, with the ground or neutral return to P2-1, and
to ensure proper speed commands the fan’s RPM is monitored at all times via P2-15. The fan will receive a high-
speed run command from P2-12, and stay running at high-speed whenever the freezer compressor is energized,
unless the call for cooling follows a defrost, in which case the evaporator fan will not be switched ON until the freez-
er evaporator is 35°F (2°C) or colder. If the freezer door is opened while the evaporator fan is operating, the micro-
processor will detect the power signal to the lights and interrupt the 12V DC power to the fan. And, if the maximum
ice production feature is activated, which forces the freezer evaporator fan ON 100% for twenty-four (24) hours, the
fan speed will then be ramped down to low-speed during the compressor off cycles. (See Figure 3-45)
NOTE:
During Sabbath Mode the lighting system is disabled and the 12V DC supplied to the evaporator fan cannot be
interrupted, so the evaporator fan may be observed running when the door is open.
If improper RPM signals are detected from the evaporator fan, the appropriate fault code will be logged.
REF
EVAPORATOR FAN
FREEZER
EVAPORATOR FAN
M
M
FLOW
METER
THERMISTER FREEZER EVAP
THERMISTER FREEZER CABINET
THERMISTER REF CABINET
THERMISTER REF EVAP
BROWN
BLACK/WHITE
WHITE/BLACK
BLUE
BROWN
BLUE
BROWN
YELLOW
RED
YELLOW/BROWN
BLUE/WHITE
BROWN
BLUE
BLUE
BROWN
BLUE
WHITE
MAIN CONTROL
BOARD
16
1
17
1
P18
3
P6
P15
P16
85
P14
1164
P6
P9
P8 P7
P5
P2
P3
P1
DEFROST HTR
COMP2
COMP1
MAIN LIGHTS
L1
NEUTRAL
L1
EXERNAL
DEVICE
KEYPAD
LOW VOLTAGE
1. 12VDC sup-
plied to
motor (P2-14)
4. High-speed
command
sent to motor
(P2-12),
switching to
low-speed
command
only when in
Max Ice Mode
and compres-
sor is in off-
cycle
Motor RPM
monitored at
all time (P2-15)
Figure 3-45. Signal Trace Schematic: Low DC Voltage Variable Speed Freezer Fan Operation
3. Freezer evaporator below 35°F (2°C)
2. Freezer’s high offset tem-
perature detected, switch-
ing compressor & con-
denser fan ON
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Sub-Zero Built-in Series Specifications

General IconGeneral
TypeBuilt-in Refrigerator
BrandSub-Zero
SeriesBuilt-in Series
Refrigeration TypeDual Refrigeration
Total CapacityVaries by model
Refrigerator CapacityVaries by model
Freezer CapacityVaries by model
HeightVaries by model
Finish OptionsStainless Steel, Custom Panel Ready
LightingLED
ShelvingAdjustable glass shelves
Water FiltrationYes
Air PurificationAir purification system
Energy Star QualifiedYes
Energy Star CertifiedYes
Door BinsAdjustable
ConfigurationVaries by model (e.g., Side-by-Side, Over-and-Under)
Smart FeaturesVaries by model (e.g., Wi-Fi connectivity, Mobile App Control)

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