Viking VCSB481 Service Notebook
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Viking VCSB481 Service Notebook

Viking VCSB481 Service Notebook

Built-in refrigerator
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SERVICE NOTEBOOK
BUILT-IN REFRIGERATOR
VCSB481 / VCSB482
VIKING RANGE CORPORATION, PO DRAWER 956, GREENWOOD, MS. 38930-USA

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Summary of Contents for Viking VCSB481

  • Page 1 SERVICE NOTEBOOK BUILT-IN REFRIGERATOR VCSB481 / VCSB482 VIKING RANGE CORPORATION, PO DRAWER 956, GREENWOOD, MS. 38930-USA...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Technical Information--------------------------------------------------------------------------- 4 Refrigerant Flow---------------------------------------------------------------------------------- 5 Cabinet Air Flow--------------------------------------------------------------------------------- 6 Machine Compartment Air Flow-------------------------------------------------------------- Component Specifications---------------------------------------------------------------------- 8 Display Panel Keyboard------------------------------------------------------------------------ 10 Electronic Functional Description------------------------------------------------------------- 11 Program Mode------------------------------------------------------------------------------------ 13 PC Board Layout--------------------------------------------------------------------------------- 16 Wiring Diagram----------------------------------------------------------------------------------- 18 Freezer Compartment Theory of Operation--------------------------------------------------- 18 Wiring Diagram----------------------------------------------------------------------------------- 19 Refrigeration Compartment Theory of Operation-------------------------------------------- 19 Wiring Diagram----------------------------------------------------------------------------------- 20...

  • Page 3: Technical Information

    TECHNICAL INFORMATION • • • • Due to a possibility of personal injury or property damage, always contact an authorized technician for servicing or repair of this refrigerator. • • • • Refer to Service Manual for design, disassemble, ice maker, safety, testing, and troubleshooting information.

  • Page 4: Refrigerant Flow

    REFRIGERANT FLOW...

  • Page 6: Machine Compartment Air Flow

    MACHINE COMPARTMENT AIR FLOW...
  • Page 7 Component Specifications Switch, refrigerator light Type SPST, NC (Right opening door hinge) Volt 125 / 250 VAC Current 3 Amps Switch, power Type DPST Volt 125 / 250 VAC Current 15 Amps Switch, freezer light, sealed Type SPST, NC Volt 125 / 250 VAC Current 5.0 Amps.

  • Page 8: Component Specifications

    Component Specifications Component Description Test Procedures Bulb Volts 120VAC Watts 40 watts Capacitor, compressor run Volts 220VAC 15 µfc + 10% Capacitance - 5% Compressor Type Fan cooled, R134a refrigerant BTUH 970 BTUH Volts 120VAC 60Hz Watt 176 watts Current: Lock rotor 21.3 A Full load !.6 A...
  • Page 9 Component Specifications Motor, condenser PSC Volt 120 VAC Rotation (facing end opposite shaft) Clockwise 1300 RPM Watt 6.4 Watts Current 0.05 Amp 480 Ω Resistance Motor, ECM evaporator Volt 120VAC fan. Rotation (facing shaft) Counterclockwise 2150 RPM Watt 1.4 Watts Motor and blade, Volt 120VAC...

  • Page 10: Display Panel Keyboard

    DISPLAY PANEL KEYBOARD Display Panel Operation 1. Freezer indicator light will glow. Freezer temperature setting will be displayed. Keyboard Pad Functions Factory setting is 5. Entry Tone 2. Change freezer temperature setting by Indicates a pad was pressed, command read and pressing Higher Temp or Lower Temp Pad.

  • Page 11: Electronic Functional Description

    Display Panel Operation (con’t) Power Disconnect Switch Lower Temp Pad Use power disconnect switch to disconnect power Lowers temperatures setting one bar at a time. If without unplugging refrigerator. Power disconnect entry tone is on, tone will sound at each bar level switch is located behind air grille on top right side.
  • Page 12 Electronic Functional Description (con’t) As temperature decreases, resistance increases. As temperature increases, resistance decreases. 1. Critical temperature for freezer is +15° F; for Open thermistor or thermistor circuit will result in refrigerator critical temperature is +60° F. failure of refrigerator to cool. Press Alarm Off pad to turn off alarm.

  • Page 13: Program Mode

    Electronic Functional Description (con’t) PROGRAM MODE Adaptive Defrost Operation Accessing Program Mode Defrost occurs after predetermined length of Two programming modes are available. Mode A compressor run hours. Compressor run time between allows defrosts changes, or adapts, depending upon recent reading refrigerator freezer...
  • Page 14 Mode A Functions (con’t) Temperature Offset Calibration Offset amount adjusts temperatures for refrigerator Freezer Thermistor Temperature cut-ins and cut-outs by the amount of offset. The Choose freezer thermistor temperature display by chart below shows the indicator and the amount of pressing Freezer Temp pad.
  • Page 15 Exiting Program Mode Press Display On pad for 3 seconds to exit Program Mode. Tone will sound three times. Changes made in Program Mode will be permanently saved in EEPROM. Note: If no pad is pressed for 10 minutes, Program Mode will be automatically exited.
  • Page 16 Electronic Functional Description WARNING: TO AVOID ELECTRICAL SHOCK WHICH CAN CAUSE SEVERE INJURY OF DEATH, DISCONNECT POWER TO REFRIGERATOR USING POWER SWIDTCH BEFORE SERVICING. WIRES REMOVED DURING DISASSEMBLY MUST BE REPLACED ON PROPER TERMINALS TO INSURE EARTHING AND POLARIZATION. AFTER SERVICING, RECONNECT POWER USING POWER SWITCH.

  • Page 18: Freezer Compartment Theory Of Operation

    Electronic Function Description Freezer Compartment Theory of Operation As a freezer thermistor warms, the resistance As thermister cools during refrigeration decreases allowing low voltage signal to be sent to cycle, resistance through thermistor electronic control. Electronic control sends two low increases blocking low voltage signal to voltage signals, one to the compressor relay coil )C1) electronic control interrupting circuit.

  • Page 19: Refrigeration Compartment Theory Of Operation

    Electronic Function Description Refrigeration Compartment Theory of Operation As fresh food thermistor warms, resistance decreases allowing low voltage signal to be sent to the As fresh food thermistor cools, resistance increases electronic control. Electronic control sends a low blocking low voltage signal to electronic control voltage signal to semiconductor switch for DC fresh interrupting circuit to DC fresh food fan and DC food fan and DC condensate evaporator fan.

  • Page 20: Refrigeration And Freezer Compartment Theory Of Operation

    Electronic Function Description Refrigerator and Freezer Compartment theory of Operation However, fresh food and condensate evaporator fans If both freezer and fresh food thermistors are warm, will continue to run until fresh food thermistor cools their resistance drops (see table Refrigerator and and signal is blocked to electronic control.

  • Page 21: Adaptive Defrost Theory Of Operation

    Electronic Function Description IMPORTANT: When the showroom switch is OFF, the isolator sees line voltage which keeps the electronic controller from signaling the evaporator fan motor or compressor relay coils and keeps the fresh food and condensate evaporator fans off. Adaptive Defrost Theory of Operation After designated compressor run time, refrigeration Electronic control keeps count of number of minutes...

  • Page 23: Ice Maker (Operation)

    ICE MAKER Specifications Mold heater: 185 watts, 264 ohms Thermostat: Close 17 ± 3° F (-8 ± 1° C) Opens 32 ± 3° F (0 ± 1° C) (Bimetal) Water fill: 140 cc, 7.5 sec. Motor cycle Stamped in circuit. Plug in connectors One revolution of blades takes 3 minutes plug stall time on ice...

  • Page 24: Ice Maker (Disassembly Procedures)

    Ice Maker Module Ohmmeter Check No power to Ice Maker and Ejector Blades in End of Cycle Position Test Points Component Module Position Ohms Mold & Heater Attached to Support Motor Separated form Heater 16,100 Module Voltage Checks with Meter or Test Light Power to Ice Maker Test Points Component...
  • Page 25 Ice Maker Ejector Blades or Stripper Remove module and support assembly. Install ejector blades, realigning “D” coupling with module cam. Accessing Control Box Remove motor and contact assembly from control box be removing 3 screws. Remove shut-off arm. Pull free. Water Fill Valve Turning water level adjustment screw will move contact in relationship with contact ring segment.
  • Page 26 Thermostat, mold heater, and wiring harness are Ice Maker replaceable. Any other failure, including motor, requires replacement module assembly. Replacement mold assembly comes with new mold heater installed. Thermostat If water valve adjustment screw fall out, put screw in Remove control box from mold be removing hole and align as shown below.
  • Page 27 Ice Maker Water Valve Water valve has 1 solenoid. Valve has 80 mesh screen water strainer. When tan encapsulated solenoid is energized, the amount of water entering ice maker mold is directly proportional to length of time water valve switch is held closed by timing cam. Inside valve is a flow washer which acts as a water pressure regulator.

  • Page 28: Troubleshooting Chart

    ICE MAKER TROUBLESHOOTING CHART No or Low Ice Production Problem Action Warm freezer Adjust freezer control or repair refrigerator Broken locking tab on vertical cam Replace Ice Maker Shorted and burned module shut-off Replace Ice Maker switch and contacts Stalled or stripped motor Replace Ice Maker 2:30 Ejector Position Contaminated module.
  • Page 29 Damaged module housing Replace Ice Maker Deformed shut-off arm Replace shut-off arm Little or no alumilastic on thermostat Apply alumilastic to thermostat Housing to mold screws not seated Tighten 2 screws (20-26 in.lb) (22.8-29.6 cm.kg) Heater not staked in mold Replace Ice Maker Incorrect heater temperature Replace Ice Maker...
  • Page 30 7:30 Ejection Position Contamination—Motor will not oscillate Replace Ice Maker Shut-off arm stuck in ice or obstructed Unjam Cubes not formed properly Check fill cup and fill assembly 9:00 Ejection Position Contaminated Replace Ice Maker Cube frozen to fill cup or mold Unjam Replace fill cup and replace Ice Maker Excessive Ice Production...
  • Page 31 Flooding or Ice in Bucket or Freezer Problem Action Thermostat out of calibration Replace Ice Maker Jammed cube stalled in water-fill cycle Remove cube. Determine reason for stall Leaky water valve Replace water valve Excessive water fill volume Replace water valve Motor stalled in water-fill cycle Replace Ice Maker (12:00 ejection position)
  • Page 33 Filename: VCSB48132.doc Directory: D:\VBCODE\IPLUTILS\PDFGenerator\InputData\F90561 VCSB 481-482 Template: C:\Documents and Settings\tomw.EYECOM\Application Data\Microsoft\Templates\Normal.dot Title: Subject: Author: Viking Range Keywords: Comments: Creation Date: 10/25/2001 8:30 AM Change Number: Last Saved On: 3/28/2003 4:01 PM Last Saved By: Ken Sievert Total Editing Time: 1 Minute...

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