Sub-Zero Built-In Series, BI-36UG, BI Series Assembly

Electronic Control System

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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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Built-In (BI) Series

Figure 3-1. Electronic Control System Overview (BI-36UG Wiring Schematic)

115 VOLTS

60 CYCLES

NEUTRAL

N.O.

WATER FILTER SWITCH

P16

MAIN

CONTROL

BOARD

P14

L1 L1

NEUTRAL

1164

P15

P18

DEFROST HTR

COMP2

COMP1

MAIN LIGHTS

N.C.

FZ DOOR SWITCH

REF DOOR SWITCH

ISOLATION VALVE

660 Ω

WATER VALVE

160 Ω

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

BLUE

WHITE

PURPLE

GRAY

RED

PINK

YELLOW

BLACK

RED

WHITE/BLUE

TAN

BLUE

ORANGE

YELLOW

ORANGE/BLACK

GRAY/WHITE

ORANGE/BLACK

WHITE

RED/WHITE

WHITE/RED

TAN

PINK

GRAY

ORANGE

WHITE

TAN/WHITE

BROWN

YELLOW

WHITE

REF

EVAPORATOR FAN

FREEZER

EVAPORATOR FAN

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

BROWN

BLUE

WHITE

MAIN CONTROL

BOARD

P18

P15

P16

P14

1164

P8 P7

DEFROST HTR

COMP2

COMP1

MAIN LIGHTS

NEUTRAL

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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MAIN CONTROL BOARD

P18

P15

P16

P14

1164

P8 P7

DEFROST HTR

COMP2

COMP1

MAIN LIGHTSL1NEUTRAL

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

ICE MAKER WATER VALVE

120 VOLT CIRCUITS

POWER IN (L1)

UNUSED

POWER IN (L1)

NEUTRAL

UNUSED

DEFROST HEATER

MAIN LIGHTS

UNUSED

COMPRESSOR #2

COMPRESSOR #1

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

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

FUNCTION

WHITE/BLUE

ORANGE/RED

GRAY/WHITE

ORANGE/BLACK

PINK

WHITE/RED

RED

TAN

ORANGE

BLACK

WHITE

BLACK

BLUE

YELLOW

PURPLE

GRA

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

EVAPORATOR FAN POWER

TACHOMETER INPUT

WATER FLOW SENSOR INPUT

FLOW METER POWER

FLOW METER RETURN

---

SENSES TEMPERATURE

---

SENSES TEMPERATURE

---

CRISPER LIGHT 12 VDC POWER

CRISPER LIGHT GROUND RETURN

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

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

REF CABINET

UNUSED

DESCRIPTION

P2-1

P2-2

P2-3

P2-4

P2-5

P2-6

P2-7

P2-8

P2-9

P2-10

P2-1

P2-12

P2-13

P2-14

P2-15

CIRCUIT

P2-16

P2-17

CIRCUIT

P3-2

P3-1

UNUSED

AIR FILTER FAN

UNUSED

DESCRIPTION

UNUSED

DESCRIPTION

UNUSED

FUNCTION

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

S x S CONTROL BOARD SUMMARY

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Built-In (BI) Series

PURE AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

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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PURE AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

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 purification 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 approximately 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 AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

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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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 accompanied by an audible beep. When the desired set-point is reached and the keys are no longer being pressed, the setpoint 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 AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

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) consecutive 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 icemaker 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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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 AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

Alarm Feature is ON

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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 compartment. 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 AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

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 (byproducts of ripening fruits and vegetables). The two main parts of this air purifier are a replaceable cartridge consisting 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 removing 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 AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

Air Purifier Feature is ON

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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 displayed 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 temperature 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 AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

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 AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

Press and hold for 5 seconds

Indicates Fahrenheit Units of Measure

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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 af

ter 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 different 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 AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

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 AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

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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 “normal” 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 af

ter 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 AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

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 AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

“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 AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

Tone Level. “nO” =Norman

Figure 3-20. Press COLDER Key to Decrease Tone; Press WARMER Key to Increase Tone

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Tone Level. “nO” =Norman

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PURE AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

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

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Figure 3-23. Set-points Appear in LCD 5 seconds after Showroom Mode is Initiated

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Figure 3-25. Then Press and Hold POWER Key for 10 seconds

PURE AIR WARMER COLDER WARMER COLDER ALARM POWER MAX ICE ICE MAKER LIGHTS

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

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Press and hold for 10 seconds

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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

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Figure 3-26. To Disable a Zone, Switch Unit OFF First by Pressing the POWER Key

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Indicates Cooling Functions for Zone Have Been Disabled

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Sub-Zero Built-In Series, BI-36UG, BI Series Assembly

Specifications and Main Features

Frequently Asked Questions

User Manual