Sub-Zero Built-in Series User manual

Electronic Control System
3-2
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Term/Component Definition / Description
Main Control Board ..………….… (Also referred to as the Main “Controller” Board), is the printed-circuit board (PC Board)
which contains a microprocessor, relays, triacs and electrical connections that monitor
and control all functions of the appliance.
Microprocessor ……….…….…... An electrical component on the control board which receives electrical signals from
other components, processes the information, then sends electrical signals to relays and
triacs on the board to open or close, switching components in the appliance ON or OFF.
Relay ……………………….……. An electrical component on the control board which switches other components in the
appliance ON or OFF when instructed to do so by the microprocessor.
Triac ………………………....…… Similar in function to a relay, the triac is a three terminal semiconductor for controlling
current in either direction.
Control Panel Assembly ……..… (Also referred to as the User Interface Module, or User Interface), is that part of the
electronic control system where all manual input operations are performed.
Function Keys …….….................. The keys or buttons on the control panel assembly used for manual input operations.
The words on the function keys are: “LIGHTS”, “ICE MAKER”, “MAX ICE”, “PURE AIR”,
“COLDER”, “WARMER”, “ALARM” and “POWER”.
Capacitance Touch Sensitive ..… The ability of the keys on the control panel to detect the natural capacitance of the
human body when in close proximity causing a change in electrons state or quantity
which signals the electronic control to perform a function.
LCD (Liquid Crystal Display) …... A semi-liquid substance sandwiched between glass in the control panel assembly. The
molecules of this semi-liquid substance have no specific orientation. However, when
electricity is applied to them, they react predictably, aligning and straightening in such a
way as to control light passage. In doing so, they can be manipulated and arranged to
form the indicators that appear in the LCD.
Indicators .....………………...…... The words, numbers and icons that appear at the LCD.
Fault Codes (Error Codes) ......... The code number indicators that may appear in the LCD when accessing Fault Code
History during Fault and Sensor Recall Mode. This coded data represents current
and/or historical problematic events that specific electronic components may have expe-
rienced.
Temperature Units of Measure…. Temperature readings observed at the LCD may be in Fahrenheit units of measure (°F)
or Celsius units of measure (°C). A series of key strokes allows the temperature units of
measure to be switched to display as either °F or °C.
Set-Point ……………………….... The desired zone temperature, established by pressing the COLDER or WARMER
keys.
High Offset (Cut-in) …………...... As the zone air temperature cycles up and down, the high offset is the maximum zone
temperature that the electronic control system will allow before calling for cooling.
Low Offset (Cut-out)…………...... As the zone air temperature cycles up and down, the low offset is the minimum zone air
temperature that the electronic control system will allow before interrupting cooling.
Thermistor …………………….…. (Also Referred to as a Temperature Sensor), is a resistor with which resistance changes
as the temperature around it changes. For electronic control system purposes, the
microprocessor detects, monitors and processes this resistance value in order to control
the appliance’s cooling functions as well as displays it as a temperature reading in the
LCD.
Variable Speed Compressor …... A compressor designed to run at varying speeds depending on the temperature detect-
ed in the corresponding zone of the appliance.
Variable Speed Fan Motor ...…... A fan motor that is deigned to runs at varying speeds depending on the temperature
detected in the corresponding zone, or the temperature of a specific component.
ELECTRONIC CONTROL TERMINOLOGY & COMPONENT DESCRIPTIONS
The Built-In Series utilizes an electronic control system which monitors, regulates, controls and displays a variety of
functions and operations in the appliance.
The table below defines some of the basic electronic control system terminology.
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Electronic Control System
3-3 #7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Figure 3-1. Electronic Control System Overview (BI-36UG Wiring Schematic)
115 VOLTS
60 CYCLES
L1 NEUTRAL
N.O.
WATER FILTER SWITCH
P16
MAIN
CONTROL
BOARD
P1
3
P14
L1
L1
NEUTRAL
1164
P2
P15
85
P3
P6 P5
P6
P9
P8
P7
P18
DEFROST HTR
COMP2
COMP1
MAIN LIGHTS N.C.
N.C.
FZ DOOR SWITCH
REF DOOR SWITCH
ISOLATION VALVE
660 Ω
WATER VALVE
160 Ω
M
IM
CONDENSER FAN MOTOR
CRISPER LIGHTS
REF LIGHTS
AIR FILTER LIGHT
FREEZER LIGHTS
FILL-TUBE HEATER
2300-2900 Ω
DEF HEATER
27.9-30.9 Ω
DEFROST TERMINATOR REFRIGERATOR COMPRESSOR
STARTING RELAY
FREEZER COMPRESSOR
STARTING RELAY
PURPLE
WHITE
WHITE/BLUE
WHITE/BLUE
BLUE
WHITE
PURPLE
GRAY RED
PINK
YELLOW
BLACK
RED
WHITE/BLUE
TAN
BLUE
ORANGE
YELLOW
YELLOW
ORANGE/BLACK
GRAY/WHITE
ORANGE/BLACK
WHITE
RED/WHITE
WHITE/RED
TAN
PINK
GRAY
ORANGE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
TAN/WHITE
TAN/WHITE
BROWN
YELLOW
WHITE
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
HIGH VOLTAGE
ELECTRONIC CONTROL SYSTEM OVERVIEW
Figure 3-1 is the wiring schematic for the model BI-36UG showing the components of the electronic control system.
• Manual input operations are performed at the Control Panel Assembly (Keypad).
• Monitoring, regulating and controlling functions take place at the Main Control Board.
• Temperatures, icons and function/diagnostic codes are displayed in the LCD (part of Keypad).
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 appliance.
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Electronic Control System
3-4
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
MAIN CONTROL
BOARD
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
Figure 3-2. Control Board Layout
Figure 3-3. Control Board Summary Table
CONTROL BOARD LAYOUT AND SUMMARY TABLE
The electrical connection points on the main control board are labeled alphanumerically (See Figure 3-2). These
labels correspond with the alphanumeric control board summary table, located on wiring diagrams (See Figure 3-3).
By referencing the summary table, it is possible to identify which components are connected at which connection
points on the main control board.
NOTE: All components on control board are non-replaceable. If problems with control board are identified, the
complete control board must be replaced.
P16-5
P16-6
P16-7
P16-8
P16-9
P18-1
P18-2
P18-3
P18-4
P18-5
P18-6
P14-5
P14-6
P14-1
P14-2
P14-3
P14-4
P15-8
P15-7
P15-6
P15-5
P15-4
P15-3
P15-1
P15-2
CIRCUIT
P16-1
P16-2
P16-3
P16-4
ICE MAKER ACCESSORIES
WATER VALVE INPUT
REFRIGERATOR DOOR INPUT
WATER FILTER RESET SWITCH
FREEZER DOOR INPUT
UNUSED
ICE MAKER
CONDENSER FAN
AIR FILTER LIGHT
UNUSED
REF BI-METAL
UNUSED
UNUSED
ICE MAKER WATER VALVE
120 VOLT CIRCUITS
POWER IN (L1)
UNUSED
POWER IN (L1)
NEUTRAL
UNUSED
UNUSED
DEFROST HEATER
MAIN LIGHTS
UNUSED
COMPRESSOR #2
COMPRESSOR #1
UNUSED
UNUSED
UNUSED
WATER VALVE
DESCRIPTION
POWERS FILL TUBE AND ACCESSORIES
---
---
SENSES IF REF DOOR IS OPEN
SENSES WATER VALVE ACTIVATION
SENSES WHEN DEF HEATER SHUTS OFF
SENSES IF FREEZER DOOR IS OPEN
POWERS ICE MAKER
CONDENSER FAN
AIR FILTER LIGHT
SENSES WATER FILTER
UNUSED
UNUSED
POWER INTO BOARD
NEUTRAL INTO BOARD
POWER INTO BOARD
POWERS MAIN LIGHTS
POWERS COMPRESSOR
POWERS REF COMPRESSOR
POWERS OFF HEATER
POWERS WATER VALVE
POWERS IM WATER VALVE
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
FUNCTION
WHITE/BLUE
ORANGE/RED
GRAY/WHITE
ORANGE/BLACK
-
PINK
WHITE/RED
RED
TAN
-
ORANGE
BLACK
-
-
WHITE
-
BLACK
BLUE
YELLOW
PURPLE
GRAY
-
-
-
-
COLOR
---
-
--
TAN/WHITE
EVAPORATOR FAN RETURN
CRISPER LIGHT POWER
CRISPER LIGHT RETURN
AIR FILTER FAN OUTPUT
AIR FILTER FAN RETURN
AIR FILTER LIGHT OUTPUT
AIR FILTER LIGHT RETURN
PWM DRIVE OUTPUT
PWM DRIVE OUTPUT
EVAPORATOR FAN POWER
TACHOMETER INPUT
TACHOMETER INPUT
WATER FLOW SENSOR INPUT
FLOW METER POWER
FLOW METER RETURN
---
---
SENSES TEMPERATURE
SENSES TEMPERATURE
SENSES TEMPERATURE
SENSES TEMPERATURE
---
---
SENSES TEMPERATURE
SENSES TEMPERATURE
SENSES TEMPERATURE
SENSES TEMPERATURE
---
---
---
---
---
---
CRISPER LIGHT 12 VDC POWER
CRISPER LIGHT GROUND RETURN
AIR FILTER LIGHT
AIR FILTER LIGHT
FREEZER EVAPORATOR FAN
REF EVAPORATOR FAN
EVAPORATOR FAN 12 VDC POWER
FREEZER EVAPORATOR FAN
LOW VOLTAGE CIRCUITS
REF EVAPORATOR FAN
UNUSED
FLOW METER 12V DC POWER
UNUSED
REFRIGERATOR EVAPORATOR
FREEZER CABINET
FREEZER EVAPORATOR
UNUSED
UNUSED
FREEZER EVAPORATOR
FREEZER CABINET
UNUSED
REFRIGERATOR EVAPORATOR
UNUSED
THERMISTER CIRCUITS
EVAPORATOR FAN GROUND RETURN
FLOW METER
P3-3
P3-7
P3-6
P3-4
P3-5
P5-9
P5-8
P5-7
P5-6
P5-5
P5-16
P5-15
P5-14
P5-13
P5-12
P5-11
P5-10
P5-4
P5-3
P5-2
P5-1
CIRCUIT
UNUSED
FLOW METER
UNUSED
UNUSED
UNUSED
REF CABINET
REF CABINET
UNUSED
UNUSED
DESCRIPTION
P2-1
P2-2
P2-3
P2-4
P2-5
P2-6
P2-7
P2-8
P2-9
P2-10
P2-11
P2-12
P2-13
P2-14
P2-15
CIRCUIT
P2-16
P2-17
CIRCUIT
P3-2
P3-1
UNUSED
AIR FILTER FAN
AIR FILTER FAN
UNUSED
DESCRIPTION
UNUSED
DESCRIPTION
UNUSED
UNUSED
FUNCTION
UNUSED
UNUSED
FUNCTION
UNUSED
FUNCTION
WHITE/BROWN
YELLOW/BROWN
WHITE/BLACK
-
BROWN
BLACK/WHITE
BROWN
BLUE/BLACK
BROWN
BLUE
BROWN
BLUE/WHITE
BROWN
BLUE/YELLOW
BROWN
BLUE/ORANGE
BROWN
BLUE/RED
----
---
----
----
COLOR
-
-
-
-
-
-
WHITE
RED/BLACK
YELLOW
RED
BLUE/WHITE
COLOR
-
-
-
BLUE
COLOR
UNUSED
UNUSED
-
UNUSED
UNUSED
-
-
S x S CONTROL BOARD SUMMARY
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Electronic Control System
3-5 #7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
CONTROL PANEL LAYOUT (AKA USER INTERFACE MODULE)
Figure 3-4 below shows the layout of the control panel assembly.
NOTES:
• Not all keys are present on all models:
-If the unit does not have a glass refrigerator door, the control panel will not have the accent LIGHTS on/off key.
-The control panel in an all-refrigerator model does not have the freezer zone COLDER and WARMER keys, nor
the ICE MAKER and MAX ICE keys.
-The control panel in an all-freezer model does not have the refrigerator zone COLDER and WARMER keys, nor
the PURE AIR key.
• The control panel keys are “capacitance touch sensitive”, so even though the words “press” is used throughout
this section to indicate what to do to the keys, they actually only need to be “touched” to operate.
• Whenever a key is touched the electronic control will emit a beep.
Figure 3-4. Control Panel Layout
UNIT / POWER
ON/OFF KEY
DOOR AJAR
ALARM ON/OFF
KEY
ACCENT LIGHTS
ON/OFF KEY
units with glass
doors only
ICE MAKER
SYSTEM ON/OFF
KEY
FREEZER ZONE
SET-POINT
ADJUSTMENT
KEYS
LCD
(Liquid Crystal ‘Display)
MAXIMUM ICE
PRODUCTION ON/OFF KEY
speeds ice production
by up to 40%
REFRIGERATOR ZONE
SET-POINT
ADJUSTMENT
KEYS
AIR PURIFIER
ON/OFF KEY
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Electronic Control System
3-6
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Figure 3-5. Power Supplied to Unit, but Unit in OFF Mode
BASIC ELECTRONIC CONTROL INPUT OPERATIONS
The following pages describe the basic input operations performed at the control panel (switching unit ON and OFF;
adjusting set-point (temperature adjustment); switching ice maker system ON and OFF; activate and deactivate
maximize ice production feature; enabling and disabling door ajar alarm feature; activate and deactivate air purifica-
tion feature; and in models with glass doors only, switching accent lighting system ON and OFF). Please note that
though possible to display temperatures in Fahrenheit or Celsius, in most cases Fahrenheit readings are shown in
this manual.
Unit ON/OFF
All units are shipped in OFF Mode. When electricity is supplied to the appliance, a short power up diagnostics test
is initiated where the lights are energized, “- -” (double-dashes) appear in the LCD, followed by the model code, then
all components are switched OFF and the word “OFF” appears in the LCD (See Figure 3-5). By pressing the
POWER key for one (1) second, electricity is allowed past the control board to the rest of the unit (See Figure 3-6),
indicated by two audible beeps, the lights energizing and temperature readings appearing in the LCD.
NOTES:
• Whenever the unit is switched OFF using the POWER key, the word “OFF” will be visible in the LCD as long as
there is electricity supplied to the appliance.
• Whenever the unit is switched ON using the POWER key, the model code will appear in the LCD for approximate-
ly two (2) seconds, then temperature readings will appear.
• If the unit experiences any problems during the power up diagnostic test, then the appropriate Fault Codes will be
logged.
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Figure 3-6. Switching Unit ON (or OFF) - Press POWER Key, Actual Temperatures will be Displayed
WHEN IN “OFF” MODE, AC LINE VOLTAGE IS STILL PRESENT AT CONTROL BOARD!
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Electronic Control System
3-7 #7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Adjusting Set-Point (Temperature Adjustment)
To adjust set-points, press the appropriate WARMER or COLDER key on control panel in multiple key strokes until
the desired set-point is achieved (See Figure 3-7). Each key stroke equals a one degree change and is accompa-
nied by an audible beep. When the desired set-point is reached and the keys are no longer being pressed, the set-
point will flash ON and OFF at two (2) second intervals for ten (10) seconds, then the current zone temperature will
be displayed.
NOTES:
• During initial pull-down the real-time compartment temperatures will be displayed, then once set-point tempera-
tures are achieved, the temperature shown in the LCD can change by no more than one (1) degree per minute.
• The temperature range in a freezer zone is -5°F (-20°C) to +5°F (-15°C).
• The temperature range in a refrigerator zone is +34°F (+1°C) to +45°F (+7°C).
• Initial factory set-points are 0°F (-18°C) in a freezer zone and 38°F (3°C) in a refrigerator zone.
• The initial stroke of the WARMER or COLDER key will change the previous set-point by one degree.
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Figure 3-7. Adjusting Set-Point - Press Desired WARMER or COLDER Key In Multiple Key Strokes
Freezer Set-Point/Temperature Display Refrigerator Set-Point/Temperature Display
Ice Maker System ON/OFF
All units are shipped with the ice maker system switched OFF. By pressing the ICE MAKER key on the control
panel, power is allowed to the ice maker system and the single ice cube icon appears in the LCD (See Figure 3-8).
To switch the ice maker system OFF, press the ICE MAKER key again and the single ice cube icon disappears.
NOTES:
• Power to the freezer lights is monitored to help control icemaker operation. If the freezer door is open, power to
the ice maker system is interrupted, unless the icemaker is filling with water at that time. After the door is closed,
power is not allowed to the ice maker system for an additional three (3) minutes, unless the Maximum Ice
Production feature has been initiated.
• The ice maker system will continue to produce ice if the ice bucket is not in the correct position. However, to help
prevent the ice maker system from filling the freezer with ice, the electronic control will not allow twenty (20) con-
secutive ice harvests between any two door openings.
• To allow ice to freeze fully and reduce effects of low water pressure, power to the ice maker system is interrupted
for forty-five (45) minutes after each ice harvest. This can be bypassed for service purposes by switching the ice-
maker system OFF, then back ON with the ICE MAKER key.
• The fill tube heater is energized 100% of the time whenever the ice maker system is ON.
• When in Sabbath Mode, the icemaker system is disabled. Sabbath Mode will be explained later.
• The ice maker system is disabled whenever the water filter or water filter plug is removed.
Figure 3-8. Switch Ice Maker System ON or OFF - Press ICE MAKER Key, Single Ice Cube Appears when ON
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Ice Maker System is ON
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3-8
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Figure 3-10. Switching Door Ajar Alarm ON or OFF - Press ALARM Key, Bell Appears when Activated
Door Ajar Alarm Feature ON/OFF
All BI Series units are equipped with a door ajar alarm feature. To enable the door ajar alarm, press the ALARM key
on the control panel and the bell icon will appear in the LCD indicating the alarm is enabled (See Figure 3-10). With
the alarm enabled, the bell icon will flash and an audible alarm will chime at two (2) second intervals whenever a
door is left open for more then thirty or sixty (30 or 60) seconds, depending on vintage. To disable the door ajar
alarm, press the ALARM key again and the bell icon disappears from the LCD.
Maximize Ice Production Feature
These appliances are equipped with a feature that can boost ice production up to 40% above normal. By pressing
the MAX ICE key on the control panel, the ice maker system is switched ON (if OFF); multiple ice cube icons appear
in the LCD (See Figure 3-9); the freezer set-point is automatically set to -5°F (-21°C) for twenty-four (24) hours, and
the freezer evaporator fan is switched to 100% run for twenty-four (24) hours, switching off only when the door is
opened.
After twenty-four (24) hours, the freezer set-point reverts to the last manually input set-point, the freezer evaporator
fan resumes its normal operation (cycling with the compressor); and two of the three ice cube icons disappear from
the LCD, indicating normal ice production has resumed.
NOTES:
• When the maximize ice production feature is active, power to the icemaker system is NOT interrupted after ice
harvest, so the icemaker will initiate a harvest as soon as the thermostat reaches 10°F (-12°C).
• Switching the unit OFF, then back ON with the POWER key, or pressing the MAX ICE key during the twenty-four
(24) hour production period will switch the maximize ice production feature OFF.
• When in Sabbath Mode, the icemaker system is disabled. Sabbath Mode will be explained later.
• The ice maker system is disabled whenever the water filter or water filter plug is removed.
Figure 3-9. Maximize Ice Production Feature ON or OFF - Press MAX ICE Key,
Multiple Ice Cubes Appear when Activated
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Maximize Ice Production Feature Activated
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Alarm Feature is ON
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Electronic Control System
3-9 #7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Accent Lighting System ON/OFF (Models Produced with Glass Doors Only)
Models produced with glass refrigerator doors are equipped with an accent lighting system in the refrigerator com-
partment. To energize the accent lighting system, press the LIGHTS key, and the bulb icon will appear in the LCD
indicating the accent lights are enabled (See Figure 3-12). With the accent lighting system energized, the accent
LED strip will be energized and stay illuminated when the door is closed. To disable the accent lights, press the
LIGHTS key again.
Figure 3-12. Accent Lighting System ON or OFF - Press the LIGHT Key, Bulb Appears when Activated
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Accent Lighting System is Activated
Air Purification Feature ON/OFF
An air purification feature has been incorporated into these appliances to remove bacteria and ethylene gas (by-
products of ripening fruits and vegetables). The two main parts of this air purifier are a replaceable cartridge consist-
ing of a small light and a filter medium, and a small low DC Voltage fan below the cartridge. The fan drives the
refrigerator compartment air through the cartridge, over the light induced chemical filtering system which converts
these harmful airborne food storage by-products into water vapor and carbon dioxide. Please note that this is not
intended to be an “air deodorizer”, but rather a devise that helps to preserve foods for longer storage life by remov-
ing these food storage by-products.
To activate the air purification feature, press the PURE AIR key, and the Pure Air Icon appears in the LCD indicating
the air purification feature has been activated (See Figure 3-11). When activated, the UV light in the filter cartridge
and the fan motor under the cartridge are energized 100% of the time, unless the refrigerator door is opened or the
unit is in Showroom Mode.
After approximately eight-thousand (8000) hours of use, the Pure Air Icon will flash, indicating it is time to change
the air purifier cartridge. To stop the Pure Air Icon from flashing and reset the timer after the cartridge is replaced,
the PURE AIR key must be pressed and held for five (5) seconds.
NOTES:
• If the unit is in Sabbath Mode, the air purifier fan will not switch OFF when the refrigerator door is opened.
• If in Showroom Mode, the air purifier will operate for thirty (30) seconds whenever the door is open or the PURE
AIR key is pressed. Pressing the PURE AIR key again will force the air purifier ON for another thirty (30) seconds.
• If the light bulb in the cartridge should fail, the Pure Air Icon will flash and the appropriate fault code will be logged.
Figure 3-11. Air Purification ON or OFF - Press PURE AIR Key, Pure Air Icon Appears when ON
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Air Purifier Feature is ON
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Electronic Control System
3-10
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
UNIQUE ELECTRONIC CONTROL INPUT OPERATIONS
The following pages illustrate unique customer input operations performed at the control panel. The input operations
described are: Temperature Unit Selection Mode, Contrast Adjust Mode, Tone Adjust Mode, Showroom Mode,
Sabbath Mode, Manual Zone Disable and Manual Freezer Evaporator Defrost.
Temperature Units Selection Mode (Selecting Degrees Fahrenheit or Degrees Celsius Display)
The appliance is initially set to display temperatures in Fahrenheit temperature units of measure, indicated by the “F”
at the upper right of the temperature readings in the LCD. This can be changed so Celsius units of measure are dis-
played by initiating Temperature Units Selection Mode.
NOTE: Temperature Units Selection Mode must be initiated within the first (1) minute after switching the unit ON.
To convert Fahrenheit (°F) temperature units of measure to Celsius (°C) within the first minute after switching the
unit ON, press and hold the ALARM key and the POWER key simultaneously for five (5) seconds, then release the
keys (See Figure 3-13); a “c“ will appear at the upper right of the temperature readings in the LCD, indicating that
temperatures will now be displayed in Celsius units of measure. Please note that changing from Celsius tempera-
ture units of measure to Fahrenheit is the same procedure (See Figure 3-14).
NOTES:
•Do not press and hold the POWER key first, that will simply switch the unit OFF.
•Temperature Units Selection Mode will end ten (10) seconds after the last key stroke, or the ALARM key can be
pressed to exit this mode before the ten (10) seconds has elapsed.
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Figure 3-13. Converting Temperature Units of Measure to °C (within first minute after switching unit ON) -
Press and Hold ALARM Key and POWER Key for 5 Seconds
Press and hold for 5 seconds
Figure 3-14. Converting Temperature Units of Measure to °F (within first minute after switching unit ON) -
Press and Hold ALARM Key and POWER Key for 5 Seconds
Indicates Celsius Units of Measure
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Press and hold for 5 seconds
Indicates Fahrenheit Units of Measure
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Electronic Control System
3-11 #7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Contrast Adjust Mode (Adjusting the LCD Contrast Level)
The contrast level of the LCD can be manually adjusted to one of five levels through Contrast Adjust mode.
NOTE: Contrast Adjust Mode can be initiated anytime after the first (1) minute of switching the unit ON.
To adjust the LCD contrast level anytime after the first minute of switching the unit ON, press and hold either set of
COLDER and WARMER keys and the POWER key simultaneously for five (5) seconds, then release the keys (See
Figure 3-15). The letter “C” will appear at the small digit location in the LCD indicating the control is now in Contrast
Adjust Mode and a number 1, 2, 3, 4, or 5 will appear at the right side of the LCD, indicating the last contrast level
setting. Pressing a COLDER key at this time will decrease the number; pressing a WARMER key will increase the
number (See Figure 3-16).
Please note that what is actually happening here is the segments and icons in the LCD are slanting at slightly differ-
ent angles for each level adjustment. This means that the lower numbers will not always indicate less contrast and
the higher numbers will not always indicate more contrast, as it depends on the line of sight of the user. In fact a tall
person and a short person standing side-by-side during the adjustment may see the contrast level move in totally
opposite directions; one seeing it increase, the other seeing it decrease.
NOTES:
•Do not press and hold the POWER key first, that will simply switch the unit OFF.
•Contrast Adjust Mode will end ten (10) seconds after the last key stroke, or press ALARM key to exit.
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Figure 3-15. Adjusting LCD Contrast Level (any time after first minute of switching unit ON) -
Press and Hold COLDER, WARMER and POWER Keys for 5 Seconds
Press and hold for 5 seconds
Figure 3-16. Press COLDER or WARMER Key to Change Contrast Level
(Pressing COLDER Shown - Decrease Number)
“C” Indicates Contrast Adjust Mode Contrast Level
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
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Electronic Control System
3-12
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Tone Adjust Mode (Adjusting the Audible Chime Tone)
The tone of the electronic control audible chime is preset at the factory. This preset level is referred to as the “nor-
mal” tone, but it can be manually adjusted down to low, or up to high, for a total of three possible settings. This is
possible through Tone Adjust Mode.
NOTE: Tone Adjust Mode can be initiated anytime after the first (1) minute of switching the unit ON.
To adjust the chime tone, first initiate Contrast Adjust Mode by pressing and holding either set of COLDER and
WARMER keys and the POWER key simultaneously for five (5) seconds, then release the keys (See Figure 3-17).
While in Contrast Adjust Mode, press the POWER key, and the letter “S” (for “Sound”) will appear at the small digit
location in the LCD indicating the control is now in Tone Adjust Mode. At the right side of the LCD will be the letters
“Hi” (for High), or “nO” (for Normal), or “Lo” (for Low), indicating the last tone setting (See Figure 3-18). Pressing a
COLDER key at this time will decrease the tone setting and the chime will sound in the lower/softer tone; while
pressing a WARMER key will increase the tone setting and the chime will sound in the higher/louder tone (See
Figures 3-19 and 3-20).
NOTES:
•Do not press and hold the POWER key first, that will simply switch the unit OFF.
•Tone Adjust Mode will end ten (10) seconds after the last key stroke, or press ALARM key to exit.
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Figure 3-17. Adjusting Chime Tone (any time after first minute of switching unit ON) - Initiate Contrast
Adjust Mode First; Press and Hold COLDER, WARMER and POWER Keys for 5 Seconds
Press and hold for 5 seconds
Figure 3-18. While in Contrast Adjust Mode, Press POWER Key to Initiate Tone Adjust Mode
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
“S” Indicates Tone Adjust Mode Tone Level. “Hi” = High
Figure 3-19. Press COLDER Key to Decrease Tone; Press WARMER Key to Increase Tone
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Tone Level. “nO” =Norman
Figure 3-20. Press COLDER Key to Decrease Tone; Press WARMER Key to Increase Tone
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Tone Level. “nO” =Norman
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Electronic Control System
3-13 #7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Showroom Mode
Showroom Mode was incorporated into the electronic control system so that these appliances could be displayed in
a showroom setting. When in Showroom Mode all cooling, defrosting, ice making and dispensing (if applicable)
functions are disabled, but the lighting system and door ajar alarm system remain operational, and the LCD will
show the set-points.
To initiate Showroom Mode, the unit must first be switched OFF using the POWER key (See Figure 3-21). Then,
press and hold either pair of WARMER and COLDER keys, then the POWER key, at which point three (3) beeps will
be emitted and “Sh” and “r” will appear in the LCD for five (5) seconds indicating the appliance is now is showroom
mode (See Figure 3-22). After the initial five seconds, set-points will appear in the LCD (See Figure 3-23).
To return the unit to normal operation, repeat the steps above.
NOTES:
• The air purifier will be energized for thirty (30) seconds any time the door is opened or the PURE AIR key is
pressed.
• The lighting system will be disabled for twenty (20) minutes if the lights stay ON more than 90% of the time in any
given fifteen (15) minutes, or if a compartment thermistor reports a temperature greater than ambient plus thirty
(30) degrees, or if an evaporator thermistor reports a temperature greater than ambient plus twenty (20) degrees.
• For demonstration purposes, the water filter icon can be forced ON during Showroom Mode by pressing the ICE
MAKER key for five (5) seconds. To switch it OFF, press the filter reset button behind the unit grille for five (5)
seconds.
• Units with glass refrigerator doors contain a glass door heater, which is disabled while in Showroom mode.
• Always check set-points after returning unit to normal operation.
Figure 3-22. Then Press and Hold Either Pair of WARMER and COLDER Keys, Then the POWER Key -
“Sh” and “r” appear for 5 Seconds
Figure 3-21. To Enter (or Exit) Showroom Mode, Switch Unit OFF First
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Figure 3-23. Set-points Appear in LCD 5 seconds after Showroom Mode is Initiated
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Electronic Control System
3-14
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Figure 3-25. Then Press and Hold POWER Key for 10 seconds
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Sabbath Mode
Sabbath Mode was incorporated into the electronic control system for the observance of certain religious days.
When Sabbath Mode is initiated the lighting systems, ice making system, dispensing system (if applicable), alarm
system and the air purification feature are disabled, plus the letters “SA” and “b” will appear in the LCD.
To initiate Sabbath Mode, the unit must first be switched OFF using the POWER key (See Figure 3-24). Then,
press and hold the POWER key for ten (10) seconds, at which time the alarm will chime, and “SA” and “b” will
appear in the LCD (See Figure 3-25).
To return to normal operation, press the POWER key, the lights will be energized accompanied by two beeps and
current zone temperature will appear in the LCD.
NOTES:
• Set-points cannot be changed and manual defrost cannot be initiated.
• The following holds true in accordance with Star-K requirements:
-Freezer defrosting functions will convert to a fixed time base sequence instead of adaptive defrosting, which is
usage based.
-The compartment/zone thermistors will still detect high off-set, which is the determining factor to start the cooling
process, but there will be a random fifteen (15) to twenty-five (25) second delay before cooling begins.
-The “SA” and “b” in the LCD remain energized when the door is closed.
• When Sabbath Mode is exited, the accent lights, door alarm, icemaker and air purification system will return to the
ON or OFF state they were in prior to initiating Sabbath Mode.
Figure 3-24. To Enter Sabbath Mode, Switch Unit OFF First
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Press and hold for 10 seconds
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Electronic Control System
3-15 #7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Manual Zone Disable Mode
Manual Zone Disable Mode allows a customer or Service Technician to switch one zone, or “compartment” OFF for
defrosting, interior cleaning, or diagnostic purposes, while allowing the other zones to continue cooling.
To initiate Manual Zone Disable Mode, the unit must first be switched OFF using the POWER key (See Figure 3-26).
Now, press and hold the WARMER key for the zone being disabled, then the POWER key, then release both keys,
at which time “- -” (double-dashes) will appear in place of temperature readings for the chosen zone (See Figure 3-
27).
To return the disabled zone to operational state, repeat the steps above.
NOTE:
• If switched OFF then back ON, the electronic control stores this mode-set in non-volatile memory, so the disabled
zone will remain disabled until the proper key sequence is performed to reenable the zone.
• The alarm system for the disabled zone is inactive during this mode.
• Always check set-points after returning unit to normal operation.
Figure 3-27. Then Press and Desired Zone WARMER Key along with the POWER Key
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Figure 3-26. To Disable a Zone, Switch Unit OFF First by Pressing the POWER Key
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Indicates Cooling Functions for Zone Have Been Disabled
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Electronic Control System
3-16
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Manual Freezer Evaporator Defrost
Manual Freezer Evaporator Defrost was incorporated into the electronic control to assist a customer that may inad-
vertently leave the freezer door ajar, causing a heavily frosted evaporator, and may also be utilized by a Service
Technician for servicing and diagnostics.
To initiate manual freezer evaporator defrost the unit must be ON, then press and hold the ICE MAKER key for five
(5) seconds, at this time the freezer evaporator temperature will be displayed at left in the LCD with the refrigerator
evaporator temperature displayed at right for five (5) seconds (See Figure 3-28), then compartment temperatures
will be displayed (See Figure 3-29).
NOTES:
• Though the refrigerator evaporator temperature is also shown when manual defrost is initiated, only the freezer
evaporator is affected.
• Manual Freezer Evaporator Defrost will not operate if unit is in Sabbath Mode.
• The defrost terminator will not allow power to the defrost heater if the evaporator is above 30°F (1°C).
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Figure 3-28. Initiate Manual Freezer Evaporator Defrost - Press and Hold ICE MAKER Key for 5 Seconds
Press and hold for 5 seconds
Evaporator Temperatures Displayed for 5 Seconds when Initiated
PURE AIRWARMERCOLDER WARMERCOLDER ALARM POWERMAX ICEICE MAKERLIGHTS
Figure 3-29. Compartment Temperatures Displayed 5 Seconds after Manual Defrost is Initiated
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Changing the Dispenser Lighting States
There are three possible lighting states at the dispenser assembly:
•All Lights ON (blue keys and white glasswell)
•Key Lights ON only
•All Lights OFF
Press the LIGHT key in multiple key strokes until the desired lighting
state is achieved (See Figure 3-30).
NOTE: During water or ice dispensing, all lights will illuminate until dis-
pensing is complete, then lights will return to their previous state.
Dispensing Water
To operate the water dispenser, set a glass on the grille of the glass-
well, then press and hold the WATER key until the desired amount of
water is received (See Figure 3-31).
NOTE: Before the water dispenser is used for the first time, or after
servicing the water dispensing system, the water reservoir tank, water
lines and plumbing connection must be purged of air by pressing the
WATER key for approximately three (3) minutes. This will clear any air
from the system, along with any foreign materials that may be present
in the plumbing connection.
Dispensing Ice
The ice dispenser in these models uses a delay, or metering feature to
limit the amount of ice dispensed each time the ICE key is pressed in
approximately two (2) second intervals.
To dispense ice, set a glass on the grille of the glasswell, then press
and hold the ICE key for approximately two (2) seconds, and the dis-
penser will meter out the ice, collect it in the cylinder valve directly
above the glass, then turn the cylinder valve to drop the ice into the
glass (See Figure 3-32).
If less ice is desired, hold the ICE key for less than two (2) seconds; if
more ice is desired, hold the ICE key until the dispensing cycle repeats.
NOTE: The ice dispenser can be reprogrammed to deactivate the delayed dispense feature, which would allow the
dispenser cylinder valve and ice auger motor to remain energized continuous whenever the ICE key is pressed and
held. This is referred to as Delayed Dispense Reset, and is covered on the next page.
Electronic Control System
3-17 #7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
DOOR DISPENSER CONTROL INPUT OPERATIONS (MODELS BI42SD AND BI48SD ONLY)
Models equipped with an ice and water dispenser through the refrigerator door utilize a capacitance touch control
panel similar to the main control panel. Below are the input operations a customer or Service Technician may per-
form at the door dispenser control panel.
Figure 3-31. Dispense Water - Press
and Hold WATER Key
Figure 3-32. Water Dispense - Press
and Hold ICE Key
Figure 3-30. Choose Light State -
Press LIGHT Key in Multiple Strokes
The dispenser assembly operates on low DC voltage. Never apply AC line voltage to the dispenser compo-
nents, doing so will damage the appliance.
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Electronic Control System
3-18
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Locking the Dispenser
The dispenser assembly is equipped with a Lock feature which deacti-
vates all keys on the dispenser control panel to prevent unintended ice
and water dispensing while cleaning and/or to prevent small children
from using the dispenser.
To activate the lock feature, press and hold the LIGHT key for approxi-
mately five (5) seconds (See Figure 3-33), until the dispenser lights
flash once and the key ( ) icon illuminates red. The dispenser lights
will remain in the state they were in before the lock feature was activat-
ed.
To deactivate the lock feature, press and hold the LIGHT key again for approximately five (5) seconds, until the dis-
penser lights flash once and the red key icon is no longer illuminated. The lights will remain in the state they were in
before the lock feature was deactivated.
Delayed Dispense Reset Mode (Deactivating/Reactivating Delayed Dispense Feature)
The ice dispenser is initially set with the delayed dispense feature active. Delayed Dispense Reset Mode allows the
Service Technician to deactivate (or reactivate) the ice delayed dispense feature. If deactivated, the ice dispenser
cylinder valve and ice auger motor will remain energized continuous whenever the ICE key is pressed and held.
NOTE: Delayed Dispense Reset Mode must be initiated within the first (1) minute after switching the unit ON. If the
unit has been running more than one (1) minute, use the POWER key on the main control panel to switch the unit
OFF then back ON.
To deactivate or reactivate this feature within the first minute after switching the unit ON:
1. Press the LIGHT key on the dispenser control panel for approxi-
mately five (5) seconds, until the dispenser lights flash once and the
key ( ) icon illuminates red. (See Figure 3-34).
2. Press and hold ICE key on dispenser control panel (See Figure 3-
35).
3. While holding ICE key, press and release the LIGHT key five con-
secutive times in rapid succession (See Figure 3-36). The key icon
will flash five times, then switch off indicating successful feature
manipulation. This can be double-checked by pressing and holding
the ICE key.
To switch back, repeat the steps above, starting with switching the unit
OFF first.
ADDITIONAL DISPENSER NOTES:
• For dispensing large quantities of ice into an ice container, open the
refrigerator door, place the container under the dispenser chute, then
press the BULK ICE key pad located above the dispenser chute.
• If any part of the dispenser system should fail, the appropriate fault
code will be logged.
• Because of the capacitance touch functionality of the dispenser keys,
they must be kept clean and dry to insure proper operation.
• When in Sabbath Mode, the dispenser is disabled.
• The ice maker system and water dispensing system are disabled whenever the water filter or water filter plug is
removed.
Figure 3-33. Lock Dispenser - Press
& Hold LIGHT Key for 5 Seconds
Figure 3-34. Press & Hold LIGHT
Key for 5 Seconds
Figure 3-35. Press & Hold ICE Key
Figure 3-36. Press LIGHT Key 5
Times While Holding ICE Key
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Electronic Control System
3-19 #7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
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.
Figure 3-37. Signal Trace Schematic: Lighting System
115 VOLTS
60 CYCLES
L1 NEUTRAL
N.O.
WATER FILTER SWITCH
P16
MAIN
CONTROL
BOARD
P1
3
P14
L1
L1
NEUTRAL
1164
P2
P15
85
P3
P6 P5
P6
P9
P8
P7
P18
DEFROST HTR
COMP2
COMP1
MAIN LIGHTS N.C.
N.C.
FZ DOOR SWITCH
REF DOOR SWITCH
ISOLATION VALVE
660 Ω
WATER VALVE
160 Ω
M
IM
CONDENSER FAN MOTOR
CRISPER LIGHTS
REF LIGHTS
AIR FILTER LIGHT
FREEZER LIGHTS
FILL-TUBE HEATER
2300-2900 Ω
DEF HEATER
27.9-30.9 Ω
DEFROST TERMINATOR REFRIGERATOR COMPRESSOR
STARTING RELAY
FREEZER COMPRESSOR
STARTING RELAY
PURPLE
WHITE
WHITE/BLUE
WHITE/BLUE
BLUE
WHITE
PURPLE
GRAY RED
PINK
YELLOW
BLACK
RED
WHITE/BLUE
TAN
BLUE
ORANGE
YELLOW
YELLOW
ORANGE/BLACK
GRAY/WHITE
ORANGE/BLACK
WHITE
RED/WHITE
WHITE/RED
TAN
PINK
GRAY
ORANGE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
TAN/WHITE
TAN / WHIT E
BROWN
YELLOW
WHITE
HIGH VOLTAGE
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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Electronic Control System
3-20
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Control Condenser Fan Operation
The microprocessor observes the power output to both compressors; if power is being supplied to either compres-
sor, a signal is sent to the condenser fan relay on the control board to close, supplying power to the condenser fan
motor (See Figure 3-38). If both compressors are OFF, the condenser fan will be OFF.
Figure 3-38. Signal Trace Schematic: Condenser Fan Operation
115 VOLTS
60 CYCLES
L1 NEUTRAL
N.O.
WATER FILTER SWITCH
P16
MAIN
CONTROL
BOARD
P1
3
P14
L1
L1
NEUTRAL
1164
P2
P15
85
P3
P6 P5
P6
P9
P8
P7
P18
DEFROST HTR
COMP2
COMP1
MAIN LIGHTS N.C.
N.C.
FZ DOOR SWITCH
REF DOOR SWITCH
ISOLATION VALVE
660 Ω
WATER VALVE
160 Ω
M
IM
CONDENSER FAN MOTOR
CRISPER LIGHTS
REF LIGHTS
AIR FILTER LIGHT
FREEZER LIGHTS
FILL-TUBE HEATER
2300-2900 Ω
DEF HEATER
27.9-30.9 Ω
DEFROST TERMINATOR REFRIGERATOR COMPRESSOR
STARTING RELAY
FREEZER COMPRESSOR
STARTING RELAY
PURPLE
WHITE
WHITE/BLUE
WHITE/BLUE
BLUE
WHITE
PURPLE
GRAY RED
PINK
YELLOW
BLACK
RED
WHITE/BLUE
TAN
BLUE
ORANGE
YELLOW
YELLOW
ORANGE/BLACK
GRAY/WHITE
ORANGE/BLACK
WHITE
RED/WHITE
WHITE/RED
TAN
PINK
GRAY
ORANGE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
TAN/WHITE
TAN / WHIT E
BROWN
YELLOW
WHITE
HIGH VOLTAGE
1. Power output to
compressors
observed by
microprocessor
2. If power is supplied to
either compressor, the
condenser fan is energized
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Electronic Control System
3-21 #7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Monitor, Regulate and Display Refrigerator Compartment Temperatures
The temperature signal from the refrigerator compartment thermistor is monitored by the microprocessor. When
high offset temperature is detected, calling for cooling, a high-speed run command is sent to the refrigerator evapo-
rator fan, switching it ON, and when the evaporator temperature climbs to 38°F (3°C) the compressor is also ener-
gized, beginning the cooling cycle. When the compartment reaches low offset temperature, the compressor and fan
are switched OFF. Though compartment air temperature fluctuates from OFF and ON cycles, it is the refrigerator
compartment’s “average” temperature that is displayed at the right side of the LCD. (See Figure 3-39)
NOTES:
• Refrigerator zone tempera-
ture range is +34°F (+1°C) to
+45°F (+7°C).
• If average compartment tem-
perature changes, the display
will change by one degree
per minute.
• If the refrigerator compart-
ment thermistor is faulty, the
refrigerator compressor
defaults to 20 minutes ON,
40 minutes OFF cycling, EE
appears at right in LCD, the
service icon flashes and the
appropriate fault code is
logged.
• If the refrigerator evaporator
thermistor is faulty, the refrig-
erator compressor will not
energize until compartment
air temperature exceeds high
offset by 5°F (3°C); the serv-
ice icon flashes and the
appropriate fault code is
logged.
• If in Sabbath Mode, the com-
partment thermistor still con-
trols compressor operation,
except that when high offset
is reached, there is a random
15 to 25 second delay before
the cooling cycle is started.
• The condenser fan is ener-
gized whenever a compres-
sor is energized.
115 VOLTS
60 CYCLES
L1 NEUTRAL
N.O.
WATER FILTER SWITCH
P16
MAIN
CONTROL
BOARD
P1
3
P14
L1
L1
NEUTRAL
1164
P2
P15
85
P3
P6 P5
P6
P9
P8
P7
P18
DEFROST HTR
COMP2
COMP1
MAIN LIGHTS N.C.
N.C.
FZ DOOR SWITCH
REF DOOR SWITCH
ISOLATION VALVE
660 Ω
WATER VALVE
160 Ω
M
IM
CONDENSER FAN MOTOR
CRISPER LIGHTS
REF LIGHTS
AIR FILTER LIGHT
FREEZER LIGHTS
FILL-TUBE HEATER
2300-2900 Ω
DEF HEATER
27.9-30.9 Ω
DEFROST TERMINATOR REFRIGERATOR COMPRESSOR
STARTING RELAY
FREEZER COMPRESSOR
STARTING RELAY
PURPLE
WHITE
WHITE/BLUE
WHITE/BLUE
BLUE
WHITE
PURPLE
GRAY RED
PINK
YELLOW
BLACK
RED
WHITE/BLUE
TAN
BLUE
ORANGE
YELLOW
YELLOW
ORANGE/BLACK
GRAY/WHITE
ORANGE/BLACK
WHITE
RED/WHITE
WHITE/RED
TAN
PINK
GRAY
ORANGE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
TAN/WHITE
TAN/WHITE
BROWN
YELLOW
WHITE
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
HIGH VOLTAGE
Figure 3-39. Signal Trace Schematic: Regulating Refrigerator Temperature
Average temp.
displayed at
right of LCD
2. Run command
sent to evapora-
tor fan
1. High offset temperature detected
3. Ref. evapora-
tor above 38°F
(3°C)
4. Compressor ener-
gized
5. Condenser fan
energized
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