Sub-Zero Wolf BI Series Service Manual
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Sub-Zero Wolf BI Series Service Manual

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800.222.7820
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Controls & Operation
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  • Page 1 subzero.com 800.222.7820 Service Manual Controls & Operation...
  • Page 2 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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. Term/Component Definition / Description Main Control Board ..………….…...
  • Page 3 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) ELECTRONIC CONTROL SYSTEM OVERVIEW Figure 2-1 is the wiring schematic for the model BI-36U showing the components of the electronic control system. • Manual input operations are performed at the Control Panel Assembly (Keypad). •...
  • Page 4 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) CONTROL BOARD LAYOUT AND SUMMARY TABLE The electrical connection points on the main control board are labeled alphanumerically (See Figure 2-2). These labels correspond with the alphanumeric control board summary table, located on wiring diagrams (See Figure 2-3). By referencing the summary table, it is possible to identify which components are connected at which connection points on the main control board.
  • Page 5 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) CONTROL PANEL LAYOUT (AKA USER INTERFACE MODULE - UIM) Figure 2-4 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.
  • Page 6 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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;...
  • Page 7 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Adjusting Set-Point (Temperature Adjustment) To adjust set-points, touch the appropriate WARMER or COLDER key on control panel in multiple key strokes until the desired set-point is achieved (See Figure 2-7). Each key stroke equals a one degree change and is accompa- nied by an audible beep.
  • Page 8 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Maximize Ice Production Feature These appliances are equipped with a feature that can boost ice production up to 40% above normal. By touching 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 2-9);...
  • Page 9 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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.
  • Page 10 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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.
  • Page 11 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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, touch and hold either set of COLDER and WARMER keys and the POWER key simultaneously for five (5) seconds, then release the keys (See Figure 2-15).
  • Page 12 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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”...
  • Page 13 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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.
  • Page 14 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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”...
  • Page 15 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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 2-26).
  • Page 16 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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.
  • Page 17 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) DOOR DISPENSER CONTROL INPUT OPERATIONS (MODELS BI-42SD AND BI-48SD ONLY) Side-by-side 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 perform at the door dispenser control panel.
  • Page 18 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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.
  • Page 19 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) INTERNAL DISPENSER CONTROL INPUT OPERATIONS (MODELS BI-42SID AND BI-48SID ONLY) Side-by side models equipped with an ice and water dispenser inside the refrigerator compartment utilize push pad- dles with micro switches behind the paddles to dispense water and ice. Below are the input operations a customer or Service Technician may perform at the internal dispenser panel.
  • Page 20 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) INTERNAL WATER DISPENSER INPUT OPERATION (MODELS BI-36UID, BI-36-UFDID AND BI-42UFDID ONLY) Over-Under models equipped with a water dispenser on the left wall inside the refrigerator compartment utilize a micro switch behind the water dispenser pad, just below the spout. Input operations a customer or Service Technician may perform at the internal water dispenser are listed below.
  • Page 21 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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 BI-30U 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 touching the POWER key.
  • Page 22 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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 2-38).
  • Page 23 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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.
  • Page 24 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Additional Regulating of Refrigerator Compartment Temperatures: Details of Controlling the Refrigerator Variable Speed Evaporator Fan Motor The evaporator fan in the refrigerator zone uses a low DC voltage variable speed motor. During normal operation and when the door is closed, the motor is supplied with 12V DC at all times from P2-14 off of the control board, with the neutral or ground return to P2-1.
  • Page 25 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Additional Regulating of Refrigerator Compartment Temperatures (Except Over/Under Models): Details of Controlling the Refrigerator Drawers Temperature The refrigerator zone (except in 30”, 36” and 42” over/under models), contains a diverter behind the evaporator cover, below the evaporator and just above the refrigerator drawers.
  • Page 26 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Monitor and Control Refrigerator Fan-Assisted, Off-Cycle Defrost Temperature signals from the refrigerator compartment and evaporator thermistor’s are observed by the micro- processor. During the off cycle defrost, if the refrigerator compartment temperature reaches high offset (calling for cooling) before the evaporator temperature rises to 38°F (3°C), no power will be supplied to the compressor, but the evaporator fan will be switched ON.
  • Page 27 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Minimize Condensation on Refrigerator Door Glass (Models Produced with Glass Doors Only) On models with glass refrigerator doors a low DC voltage, five (5) watt braided wire heater is foamed into the door around the glass perimeter.
  • Page 28 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Monitor, Regulate and Display Freezer Compartment Temperatures Temperature signals from the freezer compartment thermistor are monitored by the microprocessor. When the freezer compartment thermistor detects high offset temperature, calling for cooling, the freezer compressor is cycled ON and in most cases the evaporator fan motor receives a high-speed run command, switching it ON.
  • Page 29 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) 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.
  • Page 30 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Monitor and Control “Adaptive Defrost” of Freezer Evaporator Initially, the freezer compressor cycle-runs for six (6) hours, then the compressor and evaporator fan are switched OFF and the control board defrost relay is closed, supplying power to the defrost heater. With “Adaptive Defrost”, the length of time the defrost heater stays on to open the defrost terminator bimetal is observed by the microprocessor via the grey w/white stripe wire to P18-6.
  • Page 31 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Monitor Water Valve Flow Meter, Regulate Water Fill Volume and Display when New Water Filter is Needed The microprocessor observes the volumetric flow through the water valves via a low DC voltage signal from the flow meter, with every one revolution of the turbine inside the flow meter equaling 0.02 oz (0.5 ml) (See Figure 2-47).
  • Page 32 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Monitor Icemaker System and Display If Service is Needed During an ice production cycle, the microprocessor observes the power supplied to the water valve solenoids. If a solenoid is energized for more than thirty-five (35) seconds, power to the icemaker system is disabled for twenty-four (24) hours (See Figure 2-48), and the appropriate fault code is logged.
  • Page 33 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Monitor Compressor Run Duration, Displays If Service is Needed The microprocessor observes the changing state of the compressor relays on the control board to determine the length of compressor run time (See Figure 2-50). Other than during initial pull down, if a compressor runs 100% (Freezer = 6 hours / Refrigerator = 4 hours), five consecutive times, a fault code is logged, defrost is initiated, and the service icon will flash.
  • Page 34 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) POSSIBLE INSTRUCTION AND ERROR/FAULT INDICATORS The diagrams on these pages illustrate what a customer may see in the LCD if the appliance needs attention. NOTES: • To clear instruction indicators (See Figures 2-52 & 2-53) and restart the appropriate timer, the instructions must be followed, then touch the appropriate key or reset button as described.
  • Page 35 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) LIGHTS ICE MAKER MAX ICE COLDER WARMER COLDER WARMER PURE AIR ALARM POWER Figure 2-55A. Control Panel Locked. Door Switch Detected as Depressed (Door Closed), but Control Panel Keys were Touched. To Unlock, Repair Problem, then Disconnect Power to Unit, then Reconnect. Within 5 minutes of power up, Hold Alarm and Touch Either Colder Key Twice ICE MAKER MAX ICE...
  • Page 36 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) LIGHTS ICE MAKER MAX ICE COLDER WARMER COLDER WARMER PURE AIR ALARM POWER Figure 2-58. Service Icon Flashing, but Alarm Not Chiming (Usually with Normal Temperatures Displayed) = Major Fault Code Logged (Threatening Temp. Problems), and/or Fault Codes not Cleared after Viewing LIGHTS ICE MAKER MAX ICE...
  • Page 37 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) SERVICE INPUT OPERATIONS The following few pages explain service input operations that can be performed at the control panel: Diagnostic Mode, Fault Code Recall Mode, Temperature Log Recall Mode, Model Configuration Mode, Manual Zone Component Activation Mode and Self-Test Mode.
  • Page 38 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) THERMISTOR LOCATION CODE TABLE CODE LOCATION Refrigerator Compartment Refrigerator Evaporator Freezer Compartment Freezer Evaporator Refrigerator Drawers (Not Active) Condenser (Not Active) Ambient ADDITIONAL DIAGNOSTIC MODE NOTES: • If “Sh” and “r” appear in the LCD when initiating Diagnostic Mode (See Figure 2-63), the unit is in Showroom Mode which was covered earlier in this section.
  • Page 39 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Fault Code Recall Mode Fault Code Recall Mode allows a Service Technician to view historical data that the electronic control system may have stored if specific components experienced or detected problems. This data can be displayed in a code format in the LCD in this mode, with the data storage device capable of storing up to fifty (50) fault codes.
  • Page 40 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) FAULT CODE TABLE WITH LCD CORRELATION DIAGRAM ( PAGE 1 of 2 ) LIGHTS ICE MAKER MAX ICE COLDER WARMER COLDER WARMER PURE AIR ALARM POWER Thermistor Faults Misc Open Relay Faults Refrigerator Short/Closed...
  • Page 41 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) FAULT CODE TABLE WITH LCD CORRELATION DIAGRAM ( PAGE 2 of 2 ) LIGHTS ICE MAKER MAX ICE COLDER WARMER COLDER WARMER PURE AIR ALARM POWER Thermistor Faults Misc Open Heater Relay Faults Refrigerator Triac Open...
  • Page 42 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Temperature Log Recall Mode The electronic control system logs/stores the average temperature of each individual thermistor every thirty (30) min- utes, along with any possible event indicators. These thirty-minute periods are referred to as “indexes”. Up to two- hundred forty (240) indexes can be stored for each thermistor, which is five (5) days of temperature history.
  • Page 43 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Along with the temperature and index number, a thermistor location code will flash at three (3) second intervals in the first index digit area (“r” = Refrigerator, “r” followed by “E” = Refrigerator Evaporator, “F” = Freezer, “F” followed by “E”...
  • Page 44 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Temperature Log Event Indicators - The diagrams below illustrate possible event indicators that may be observed while in Temperature Log Recall Mode. (See Figures 2-76 through 2-78) “bL” = Blank LIGHTS ICE MAKER MAX ICE...
  • Page 45 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Model Configuration Mode The main control board is used in several different models, so it must be configured/programmed for the specific model it is used in through a series of key strokes at the control panel. This is called Model Configuration. If a new control board is installed during a service call, a default configuration is automatically entered represented by “dE”...
  • Page 46 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) LIGHTS ICE MAKER MAX ICE COLDER WARMER COLDER WARMER PURE AIR ALARM POWER Figure 2-82. Toggle Through Model Codes with Multiple Key Strokes of COLDER or WARMER keys Until Correct Model Code is Displayed (Example: on one Service Board “045” = BI-36U SWS #4250000) LIGHTS ICE MAKER MAX ICE...
  • Page 47 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Manual Component Activation Mode Manual Component Activation Mode allows a Service Technician to activate and toggle through various unit func- tions while observing the corresponding function codes and associated temperatures in the LCD. This mode also allows for voltage checks at the activated components without having to wait for the zone to call for cooling.
  • Page 48 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) REFRIGERATOR ZONE MANUAL COMPONENT ACTIVATION TABLE STEP FUNCTIONS / COMPONENT(S) LCD VIEW COMMENTS All Components OFF; All Lights OFF OFF Displayed; All Lights OFF Ref Compressor ON Zone Temp & r Displayed; Actual temps will vary Alternate Evap Temp &...
  • Page 49 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Self-Test Mode Initiating Self Test Mode forces the electronic control to cycle through all relays and triacs, switching components ON and OFF, and check for correct feedback information from various electrical components. Then, if a relay or triac fails to function properly, or if incorrect feedback is received, the appropriate fault codes will be logged.
  • Page 50 - suppliers and consumers – in order to efficiently deliver reliable, economic, and sus- tainable electricity services. This section of the manual concentrates on Sub-Zero appliances and how they interact with a smart grid at the housing industry level, sometimes referred to as “smart home” controls.
  • Page 51 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Emergency Suspend Mode (Group A) This mode can be requested by the utility or Energy Management System (EMS) to cause the appliance to cease using energy for a short term. If the ALARM key or POWER key is touched during Emergency Suspend Mode the mode will end and the appliance will return to the previous active mode.
  • Page 52 Electronic Control Built-In (BI) Series Built-In (BI) Series (SWS #4380000) (SWS #4380000) Short Vacation Mode (Group B) During this mode the unit displays “VA So” instead of temperatures. There is high food preservation but very low energy consumption designed for short term non-use of the appliance. The smart grid icon will be on and the letters “VA SO”...
  • Page 53 • Third party devices that are approved by Sub-Zero, Inc. are allowed to be marketed and sold as being compatible for use on the appliances. These devices will not be sold or supported directly by Sub-Zero at any point in time.

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