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Subzero WOLF UW Series Service Manual

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General Information
Controls & Operation
Sealed System
Air Flow & Fan Blade Spacing
Component Access & Removal
Troubleshooting Guide
Technical Data
Wiring Diagrams
UW Undercounter Wine
Service Manual
subzero.com
800.222.7820
23
28
29
41
54
55
2
4

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Summary of Contents for Subzero WOLF UW Series

  • Page 1 800.222.7820 UW Undercounter Wine Service Manual General Information Controls & Operation Sealed System Air Flow & Fan Blade Spacing Component Access & Removal Troubleshooting Guide Technical Data Wiring Diagrams...

  • Page 2: Important Safety Information

    The service technician should read the complete instructions contained in this manual before initiating any repairs. For installation information see Wine Storage Installation Guide available at http://www.subzero-wolf.com/tradere- sources/product-specifications For Use and Care information see Wine Storage Use & Care Guide available at http://www.subzero- wolf.com/traderesources/product-specifications TECHNICAL ASSISTANCE...

  • Page 3: Warranty Information

    General Information MODEL UW-24 MODEL UW-24 WARRANTY INFORMATION Warranty Details: * Includes, but is not limited to the following: This page summarizes the 2, 5 & 12 Year Residential Electronic Control System Components, Fan & Light Warranty provided with every Sub-Zero, as well as two Switches, Fan Motors &...
  • Page 4 General Information MODEL UW-24 MODEL UW-24 MODEL UW-24 FEATURES FEATURES Product Rating Plate Electronic Control Panel and Display Wine Storage Racks Full-View Glass Door Home Security System Condenser (behind kickplate / grille) #7040748 - Revision A - September, 2016...
  • Page 5 Electronic Control System MODEL UW-24 MODEL UW-24 MODEL UW-24 ELECTRONIC CONTROL TERMINOLOGY & COMPONENT DESCRIPTIONS The UW-24 utilizes an electronic control system which monitors, regulates, controls and displays a variety of func- tions 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 6 Electronic Control System MODEL UW-24 MODEL UW-24 MODEL UW-24 WINE STORAGE ELECTRONIC CONTROL SYSTEM This page contains a basic illustration of the UW-24 electronic control system (See Figure 2-1). Input operations are performed at the membrane switch (part of the control panel assembly), with monitoring, regulating and controlling functions taking place at the control board (located directly behind the control panel).
  • Page 7 Electronic Control System MODEL UW-24 MODEL UW-24 MODEL UW-24 CONTROL BOARD LAYOUT AND SUMMARY TABLE The electrical connection points on the wine storage control board are labeled alphanumerically. These labels corre- spond with the alphanumeric control board summary layout table on the wiring diagram. By referencing the table, it is possible to identify which components are connected at which connection points on the control board.

  • Page 8: Control Panel Layout

    Electronic Control System MODEL UW-24 MODEL UW-24 CONTROL PANEL LAYOUT Upper Compartment COLDER WARMER TEMP/DOOR ALARM & Temperature Upper POWER SERVICE Alarm ON/OFF Compartment LED Icons/Indicators Display Window LIGHTS Lower ON/OFF Compartment LED Display Window COLDER WARMER Lower Compartment Figure 2-4. Control Panel Layout BASIC INPUT OPERATIONS The following pages describe the basic input operations performed at the control panel (switching unit ON and OFF, adjusting temperature set-point, switching lighting system ON and OFF, and enabling and disabling the tempera-...
  • Page 9 Electronic Control System MODEL UW-24 MODEL UW-24 Adjusting Temperature Set-Points To adjust set-points, press the COLDER or WARMER keys on the control panel in multiple key strokes until the desired set-point is achieved (See Figure 2-6). One key stroke equals a one degree change. The set-point is dis- played for three seconds after the last key stroke.
  • Page 10 Electronic Control System MODEL UW-24 MODEL UW-24 UNIQUE INPUT OPERATIONS The following pages illustrate unique input operations performed at the control panel, namely: Temperature Units Selection Mode, Sabbath Mode and Showroom Mode. Temperature Units Selection Mode The electronic control is initially set to display temperature in Fahrenheit (°F) units of measure. Units of measure can be converted from °C to °F, and/or back again.
  • Page 11 Electronic Control System MODEL UW-24 MODEL UW-24 Showroom Mode Showroom Mode was incorporated into the electronic control system so the appliance could be displayed in a show- room setting. When in Showroom Mode, all cooling functions are disabled, but the lighting system remains active. To initiate Showroom Mode, begin by switching the unit OFF using the POWER key (See Figure 2-11).
  • Page 12 Electronic Control System MODEL UW-24 MODEL UW-24 FUNCTION OF THE ELECTRONIC CONTROL SYSTEM The following pages explain monitoring, regulating and controlling functions of the electronic control system. Signal traces from the UW-24 wiring schematic are used to show current flow for the functions being explained. ELECTRIC SHOCK HAZARD! POWER TO THE UNIT MUST BE DISCONNECTED WHENEVER SERVICING COMPONENTS POWERED BY ELECTRICITY OR COMPONENTS NEAR ELECTRICAL COMPONENTS.
  • Page 13 Electronic Control System MODEL UW-24 MODEL UW-24 Control Compressor, Condenser Fan, Dual Refrigerant Valve and Evaporator Fan Motors The control senses evaporator and compartment temperatures via thermistors; one on each evaporator, and one in each compartment. High Offset (Cut-in) is governed by the evaporator temperatures; Low Offset (Cut-out) is gov- erned by the compartment/zone temperatures.
  • Page 14 Electronic Control System MODEL UW-24 MODEL UW-24 Monitor and Control Off-cycle Defrost With High Offset (Cut-in) being governed by evaporator temperatures, the refrigeration system will remain off until at least one evaporator temperatures exceeds set-point by one degree. With a set-point of 40°F, the high-offset would be 41°F;...
  • Page 15 Electronic Control System MODEL UW-24 MODEL UW-24 POSSIBLE ERROR/FAULT INDICATORS All wine storage units are equipped with an audio-visual temperature alarm feature, as well as low voltage wiring provisions to allow the alarm to be tied into a home security alarm system. This section explains the temperature alarm feature and the audio and/or visual error indicators that may alert a customer of a malfunction.
  • Page 16 Electronic Control System MODEL UW-24 MODEL UW-24 Cold Temperature Alarm A cold temperature alarm can occur if either wine storage compartment remains below 40°F too long, in conjunction with several consecutive maximum run-time cycles. A cold temperature alarm situation will cause the SERVICE indi- cator to flash (See Figure 2-21), and an appropriate error code to be logged;...
  • Page 17 Electronic Control System MODEL UW-24 MODEL UW-24 Thermistor Malfunction Error/Fault Indicators The diagrams below illustrating what a customer may see on the display if there is a thermistor fault, such as a short circuit or open circuit condition (See Figures 2-24, 2-25, 2-26). A thermistor fault will cause power to the compres- sor and fans to be cut, and appropriate error codes will be logged.
  • Page 18 Electronic Control System MODEL UW-24 MODEL UW-24 TROUBLESHOOTING INPUT OPERATIONS The following pages explain troubleshooting input operations performed at the control panel, namely: Diagnostic Mode, Manual Valve Activation Mode and Temperature Log Recall Mode. Diagnostic Mode Initiating Diagnostic Mode allows the Service Technician to observe real-time temperature readings from all thermis- tors without temperature averaging.
  • Page 19 Electronic Control System MODEL UW-24 MODEL UW-24 Diagnostic Mode Alerts “EE” observed in the left display window during Diagnostic Mode - The thermistor, or its wiring in the location indicated by the code at right is open or shorted (See Figure 2-31). Figure 2-31.
  • Page 20 Electronic Control System MODEL UW-24 MODEL UW-24 Manual Valve Activation Mode Manual Valve Activation Mode forces the refrigerant valve to feed refrigerant to the desired evaporator, while ener- gizing the appropriate evaporator fan motor along with the compressor and condenser. Once initiated, the mode lasts for five minutes, during which time the chosen evaporator’s temperature is displayed on the control panel.
  • Page 21 Electronic Control System MODEL UW-24 MODEL UW-24 Temperature Log Recall Mode The electronic control system is equipped with a temperature history data storage system. This system logs/stores the average temperature of both zone/compartment thermistors every four hours, along with any event alerts, that may have occurred.
  • Page 22 Electronic Control System MODEL UW-24 MODEL UW-24 Temperature Log Event Alerts The diagrams below illustrate possible event alerts that may be observed while toggling through readings in Temperature Log Recall Mode. (See Figures 2-38 through 2-41) Figure 2-38. “bl” Displayed at Left: Index is Blank, no Temperature Logged Yet (Only possible within first 11 days of unit operation, or after new control board is installed during service) Figure 2-39.
  • Page 23 Electronic Control System MODEL UW-24 MODEL UW-24 TEMPERATURE LOG INDEX CHART Index # Previous Time Frame/Hours Index # Previous Time Frame/Hours Index # Previous Time Frame/Hours 4 Hours 92 Hours 180 Hours 8 Hours 96 Hours (4 Days) 184 Hours 12 Hours 100 Hours 188 Hours...

  • Page 24: Hfc-134A Refrigerant Service Information

    Sealed System Information MODEL UW-24 MODEL UW-24 HFC-134a REFRIGERANT SERVICE INFORMATION The sealed system contains HFC-134a refrigerant. This section gives some general rules for working with 134a, and explains procedures to be followed while servicing the sealed system. 134a refrigerant requires synthetic Ester oil in the compressor, and does not tolerate contamination from other refrigerants, moisture, petroleum-based lubricants, silicone lubricants, cleaning compounds, rust inhibitors, leak detection dyes, or any other type of additive.
  • Page 25 Sealed System Information MODEL UW-24 MODEL UW-24 WINE STORAGE 134a SEALED SYSTEM REPAIR PROCEDURES Problem Service Procedures Non-Operating, Inefficient, Capture refrigerant Noisy Compressor Replace Compressor Replace filter-drier (NOTE: To check for a non- Evacuate or sweep charge system operating compressor, a hard NOTE: If evacuating the sealed system, you must evacuate from both the low &...
  • Page 26 Sealed System Information MODEL UW-24 MODEL UW-24 WINE STORAGE SEALED SYSTEM FRAME HEATER (HOT GAS) The following six diagrams illustrate a basic wine stor- age sealed system. The components are listed in order of refrigerant flow, with an explanation of their funda- mental role as part of a sealed system.
  • Page 27 Sealed System Information MODEL UW-24 MODEL UW-24 Capillary Tubes & Heat Exchangers (Figure 3-4) FRAME HEATER (HOT GAS) The high-pressure warm liquid refrigerant travels through the long skinny capillary tube which is soldered CAPILLARY TUBE to the suction tube (these two tubes soldered together create the heat exchanger).

  • Page 28: Refrigerant Flow Diagrams

    Sealed System Information MODEL UW-24 MODEL UW-24 REFRIGERANT FLOW DIAGRAMS Frame Heater (Hot Gas) Upper Heat Exchanger Upper Compartment Evaporator Lower Heat Exchanger Lower Compartment Evaporator “T” Connection Condenser Filter-Drier Compressor AWECO Valve Figure 3-7. Model UW-24 Refrigerant Flow #7040748 - Revision A - September, 2016...
  • Page 29 Air Flow MODEL UW-24 MODEL UW-24 AIR FLOW / EVAPORATOR FAN-BLADE SPACING 7/8" ± 1/16" (2.22 cm ± .16 cm) Upper Fan Blade Assembly 7/8" ± 1/16" (2.22 cm ± .16 cm) CLAMP FORWARD Lower Fan Blade Assembly CLAMP FORWARD Figure 4-1.

  • Page 30: Component Removal

    Component Removal MODEL UW-24 MODEL UW-24 COMPONENT REMOVAL This section explains how to remove components from the Model UW-24. An attempt has been made to arrange these procedures in such a way as to simulate which components would need to be removed first in order to gain access to other components. When following a component removal proce- dure, it may be necessary to reference another component removal procedure listed earlier in this section.

  • Page 31: Exterior Cosmetic And Mechanical Components

    Component Removal MODEL UW-24 MODEL UW-24 EXTERIOR COSMETIC AND MECHANICAL COMPONENTS Kickplate To remove the kickplate, extract the mounting screws Mounting Screw located at each end of the kickplate and pull the kick- (1 of 2) plate forward (See Figure 5-1). Door Switch and Switch Box Bracket Assembly The door switch is inserted through the hole in the switch box bracket assembly.
  • Page 32 Component Removal MODEL UW-24 MODEL UW-24 Exterior Wrap Components (Model UW-24FS ONLY) Stainless Steel Base Cover Assemblies - The base cover assemblies are stuck to the sides of the unit base with double-stick tape. Screws passing through the kickplate and the front flange of the base cover secure the kickplate and covers to the unit base.
  • Page 33 Component Removal MODEL UW-24 MODEL UW-24 INTERIOR COSMETIC AND MECHANICAL COMPONENTS Wine Rack Removal To remove a wine rack (See Figure 5-6): 1. Pull wine rack forward until it stops. 2. Lift front of wine rack up while pulling forward. 3.
  • Page 34 Component Removal MODEL UW-24 MODEL UW-24 Upper or Lower Evaporator Fan Cover Removal Upper Evap Cover To remove the upper or lower evaporator fan cover Screw (See Figure 5-9): 1. Remove the wine racks from the required section. 2. Extract the evaporator fan cover screws. Upper and Lower Evaporator Cover Removal To remove either of the evaporator covers, the wine racks, cabinet slides, slide spacers, slide support spac-...
  • Page 35 Component Removal MODEL UW-24 MODEL UW-24 Control Board Access and Removal The control board is located behind the control panel, on the bottom of the compartment divider, and is con- cealed by the service panel. The control board is held in place by four tabs, one at each corner.
  • Page 36 Component Removal MODEL UW-24 MODEL UW-24 Control Panel Assembly and Lower Light Bracket Removal The control panel assembly and the lower light bracket are attached to each other and must be removed together. To remove the control panel assembly and the lower light bracket, first remove the wine racks from the unit, then (See Figure 5-14): 1.
  • Page 37 Component Removal MODEL UW-24 MODEL UW-24 Evaporator Thermistors The evaporator thermistors are attached to the right side of each evaporator brackets with a “P” clamp and P-Clamp screw. To remove an evaporator thermistor, first remove the wine racks in the appropriate section, then (See Figure 5-17): 1.
  • Page 38 Component Removal MODEL UW-24 MODEL UW-24 Condenser Fan Assembly Removal Grounding Screw The condenser fan motor is secured to the condenser bracket with screws. The bracket is secured to the unit tray by screws passing up from under the unit tray into threaded stand-offs.

  • Page 39: Sealed System Components

    Component Removal MODEL UW-24 MODEL UW-24 SEALED SYSTEM COMPONENTS The sealed system contains R134a. To access any of the sealed system components the unit will need to be removed from the installation and the cabinet seperat- ed. When servicing the sealed system, the refrigerant valve assembly (includes filter-drier) MUST be replaced.
  • Page 40 Component Removal MODEL UW-24 MODEL UW-24 Evaporator Assembly Removal Heat Exchanger The evaporator assembly consists of the evaporator Evaporator and heat exchanger. One evaporator assembly is mounted to the rear wall in each section with screws. Suction Line NOTES: • The refrigerant valve with the filter-drier must be replaced when replacing an evaporator.
  • Page 41 Component Removal MODEL UW-24 MODEL UW-24 Compressor Removal The compressor is located at the back of the unit tray. Compressor NOTES: • The refrigerant valve with the filter-drier must be Suction replaced when replacing a compressor. • After capillary tube separates, check tubing for internal burrs.
  • Page 42 Troubleshooting Guides MODEL UW-24 MODEL UW-24 TROUBLESHOOTING GUIDES This section of the manual contains: • Temperature Problem Diagnostic Worksheets • Error Code Tables and the Error Code Troubleshooting Guides • General Troubleshooting Guide • Sealed System Diagnostic Tables • Membrane Switch/Ribbon Cable Test Procedures •...
  • Page 43 Troubleshooting Guides MODEL UW-24 MODEL UW-24 TEMPERATURE PROBLEM DIAGNOSTIC WORKSHEET Temperature Displayed: Lower _________ Upper _________ Set-Point: Lower _________ Upper _________ Diagnostic Mode Thermistor Readings: (Error Codes) _______________________________________ (Upper Evap) ________ (Lower Evap) ________ (Upper Cmprt) ________ (Lower Cmprt)________ Logged Temp. Logged Temp.
  • Page 44 Troubleshooting Guides MODEL UW-24 MODEL UW-24 TEMPERATURE PROBLEM DIAGNOSTIC WORKSHEET Temperature Displayed: Lower _________ Upper _________ Set-Point: Lower _________ Upper _________ Diagnostic Mode Thermistor Readings: (Error Codes) _______________________________________ (Upper Evap) ________ (Lower Evap) ________ (Upper Cmprt) ________ (Lower Cmprt)________ Logged Temp. Logged Temp.
  • Page 45 Troubleshooting Guides MODEL UW-24 MODEL UW-24 TEMPERATURE PROBLEM DIAGNOSTIC WORKSHEET Temperature Displayed: Lower _________ Upper _________ Set-Point: Lower _________ Upper _________ Diagnostic Mode Thermistor Readings: (Error Codes) _______________________________________ (Upper Evap) ________ (Lower Evap) ________ (Upper Cmprt) ________ (Lower Cmprt)________ Logged Temp. Logged Temp.
  • Page 46 Troubleshooting Guides MODEL UW-24 MODEL UW-24 Wine Storage Error Code Troubleshooting Guide Instructions Error Codes indicate problems logged by specific components. If error codes are logged, they appear before tem- perature readings while in Diagnostic Mode and they can be toggled through with the temperature readings. 1.
  • Page 47 Troubleshooting Guides MODEL UW-24 MODEL UW-24 WINE STORAGE ERROR CODE TROUBLESHOOTING GUIDE Error Code Test / Action EC 05 a. Check upper compartment thermistor electrical connections and continuity from thermistor to J2 on control board. Reconnect / repair connections. b. Check upper compartment thermistor for 30,000 to 33,000 ohms at 32°F. Replace thermistor if defective. EC 06 a.
  • Page 48 Troubleshooting Guides MODEL UW-24 MODEL UW-24 General Troubleshooting Guide The Table of Contents below indicates how the General Trouble Shooting Guide is arranged. 1. As close as possible, match the complaint, or description of the problem the unit is experiencing with those in the table of contents below.

  • Page 49: Test / Action

    Troubleshooting Guides MODEL UW-24 MODEL UW-24 PROBLEM POSSIBLE CAUSE TEST / ACTION A. SERVICE FLASHING See Error Code Troubleshooting Guide See Error Code Troubleshooting Guide B. WARM TEMPERATURE IN Control Set Too Warm Check set-points. Adjust set-points COLDER BOTH WINE STORAGE COMPARTMENTS Adjust set-points colder, listen for compressor Unit in Showroom Mode...
  • Page 50 Troubleshooting Guides MODEL UW-24 MODEL UW-24 PROBLEM POSSIBLE CAUSE TEST / ACTION C. WARM TEMPERATURE IN Control Set Too Warm Check/adjust set-points. ONLY ONE WINE STORAGE COMPARTMENT Unit Recently Energized Allow time for unit to pull down to temperature Unit Recently Stocked with Wine Allow time for unit to pull down to temperature High Room Ambient Instruct Customer that unit performs best...
  • Page 51 Troubleshooting Guides MODEL UW-24 MODEL UW-24 PROBLEM POSSIBLE CAUSE TEST / ACTION D. ACTUAL VS. DISPLAYED Wrong Units of Measure Selected, Initiate Temperature Units Selection Mode to TEMPERATURE OVER 10° (Fahrenheit - °F vs. Celsius - °C) check units of measure (°F or °C) selected. DIFFERENT Compartment Thermistor Fault Check thermistor ohms = 30,000 - 33,000 at...
  • Page 52 Troubleshooting Guides MODEL UW-24 MODEL UW-24 PROBLEM POSSIBLE CAUSE TEST / ACTION NO LIGHTS Unit in Sabbath Mode Press & release POWER key. Door Switch Disconnected or Check switch electrical connections. Check Malfunctioning for power to / from switch. Reconnect or replace switch if defective.

  • Page 53: Normal Operating Pressures

    Troubleshooting Guides MODEL UW-24 MODEL UW-24 SEALED SYSTEM DIAGNOSTIC INFORMATION NOTES: • The temperature/pressure table below is for reference only. A unit's temperature/pressure correlation may differ from those listed due to: variations in evaporator thermistor location, set-points, where the sealed system is in the refrigeration cycle, ambient temperature, etc.
  • Page 54 Troubleshooting Guides MODEL UW-24 MODEL UW-24 WINE STORAGE MEMBRANE SWITCH / RIBBON CABLE TEST PROCEDURE The membrane switch is that part of the control panel assembly consisting of the function keys used for all input functions to the electronic control system. (See Figure 6-1) Perform the eight continuity checks below if the integrity of the membrane switch and/or its ribbon cable is suspect.
  • Page 55 Technical Data MODEL UW-24 MODEL UW-24 Model UW-24 REFRIGERATOR CHARGE (R-134a Refrigerant) 3.25 oz NOTE: Always check serial tag for exact charge NORMAL OPERATING PRESSURES Low Side 10 psig to 36 psig High Side 90 psig to 100 psig COMPRESSOR Original/Service Compressor Amps ~.65/~.65 Original/Service Compressor BTU/H...
  • Page 56 Wire Diagrams/Schematics MODEL UW-24 MODEL UW-24 WIRE DIAGRAM MODELS: UW-24 & UW-24FS - This wiring information is provided for use by qualified service personnel only. - Disconnect appliance from electrical supply before beginning service. - Be sure all grounding devices are connected when service is complete. - Failure to observe the above warnings may result in severe electrical shock.
  • Page 57 Wire Diagrams/Schematics MODEL UW-24 MODEL UW-24 WIRE SCHEMATIC MODELS: UW-24 & UW-24FS - This wiring information is provided for use by qualified service personnel only. - Disconnect appliance from electrical supply before beginning service. - Be sure all grounding devices are connected when service is complete. - Failure to observe the above warnings may result in severe electrical shock.
  • Page 58 Wire Diagrams/Schematics MODEL UW-24 MODEL UW-24 CONTROL BOARD & CHART MODELS: UW-24 & UW-24FS - This wiring information is provided for use by qualified service personnel only. - Disconnect appliance from electrical supply before beginning service. - Be sure all grounding devices are connected when service is complete. - Failure to observe the above warnings may result in severe electrical shock.

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