Viking VCBB360R, VCBB362R, VCBB360L, VCBB362L Service Manual

SERVICE NOTEBOOK

REFRIGERATOR

VCBB360R / VCBB362R (Right) – VCBB360L / VCBB362L (Left)

VIKING RANGE CORPORATION, P.O. DRAWER 956, GREENWOOD, MS. 38930 - USA

Table of Contents

Technical Information................................................................................................................... 3

Display Panel................................................................................................................................ 4

Display Panel Operation............................................................................................................... 5

Electronic Functional Description................................................................................................ 6

Power Disconnect Switch Showroom Switch Alarms

Temperature Control Operation.................................................................................................... 7

Adaptive Defrost Operation.......................................................................................................... 8

Program Mode............................................................................................................................... 9

Electronic Testing......................................................................................................................... 11

Electronic Function Description................................................................................................... 12

Wiring Diagram............................................................................................................................ 14

Wiring Schematic (Complete)........................................................................................................ 15

Wiring Schematic (Freezer Compartment)..................................................................................... 16

Wiring Schematic (Refrigeration Compartment)............................................................................ 17

Wiring Schematic (Refrigerator and Freezer Compartment).......................................................... 18

Wiring Schematic (Adaptive Defrost)............................................................................................. 19

Component Specification.............................................................................................................. 20

Component Testing....................................................................................................................... 23

Troubleshooting Charts................................................................................................................. 31

System Diagnosis.......................................................................................................................... 33

Service Procedures........................................................................................................................ 34

Refrigerant Flow............................................................................................................................ 40

Cabinet Airflow............................................................................................................................. 41

Machine Compartment Air Flow................................................................................................... 42

Typical External Sweat Pattern..................................................................................................... 43

Disassembly Procedures................................................................................................................ 44

Ice Maker....................................................................................................................................... 47

Ice Maker Troubleshooting Chart.................................................................................................. 52

Ice Maker Wiring Diagram and Part Layout.................................................................................. 55

Technical Information – Refrigerator

To avoid electrical shock which can cause severe personal injury or death, disconnect power to refrigerator using power switch before servicing. Wires removed during disassembly must be replaced on proper terminals to insure correct earth ground and polarization. After servicing, reconnect power using power switch.

Refrigerator Center Freezer Compartment Food Compartment Percent Run Cycle/24 hr Average temperature Food Average Kw/24 hr ± 0.4 Time ± 10% ± 25% ± 3°F Temperature ± 3°F

Ambient° F 65° 90° 110° 65° 90° 110° 65° 90° 110° 65° 90° 110° 65° 90° 110°

1.2 2.3 4.2 28 52 100 30 32 0 39 39 45 3 3 3

Temperature Relationship Test Chart

T-3 Suction Average Total Suction Pressure Head Pressure

T-1 Outlet ± 3° F T-1 Inlet ± 3° F Line Wattage ±10% ± 2 PSIG ± 5 PSIG

± 7°F

Ambient °F 65° 110° 65° 110° 65° 110° 65° 110° 65° 110° 65° 110°

-14 -14 -14 -14 25 103 157 168 0 0 110 157

Display Panel Keyboard

Display Panel

Display Panel Operation Keyboard Tone

Entry Tone

Indicates a pad was pressed, command read and accepted, Turn off entry tone by pressing and holding Display On pad for 3 to 5 seconds.

Command Accepted Tone

Three short tones indicate command accepted.

Display On Pad

1. Activates control panel. Control panel remains active at least 10 minutes .

2. Turns off Power Up Alarm (flashing lights)

after power is firs t p lug ged in or af ter p o wer outage.

All pads, except Alarm Off, are inactive

Note:

until display On is pressed.

Freezer Temp Pad

Activates freezer temperature settings mode.

1. Fr ee zer indic ator light will glow. Freezer temperature setting will be displa yed. Factory setting is 5.

2. Change freezer temperature setting by pressing Warmer or Colder pad.

Ref Temp Pad Activates refrigerator temperature settings mode. !. Refrigerator indicator light will glow. Refrigerator temperature setting will be displayed. Factory setting is 5.

2. Change refrigerator temperature setting by

pressing Warmer or Colder pad.

Warmer Pad

Raises temperature settings one bar at a time. If entry tone is on, tone will sound at each bar level until top level is reached. !. Turn on temperature setting function of control panel by pressing Warmer pad.

2. Press and hold Warmer pad to raise temperature setting at a faster rate.

Colder Pad Lowers temperature sett ing one b ar at a tim e. If entry tone is on, tone will sound at each bar level until bottom level is reached.

1. Turn on temperature setting function of

control panel be pressing Colder pad.

2. Press and hold Colder pad to lower

temperature setting at a faster rate.

Max Frz Pad

Activates Maximum freezer mode s etting freezer temperature to coldest setting for 24 hours or until Max Frz pad is pressed again.

1. Freezer indica t or light wi ll g lo w.

2. To adjust maximum freezer mode time refer to Program Mode B functions.

Max Ref Pad Activates Maximum refrigerator mode setting refrigerator to coldest sett in g f or 24 hours or until Max Ref pad is pressed again. !. Refrigerator indicator light will glow.

2. To adjust maximum refrigerator time refer

to Program Mode B functions.

Alarm Off Pad

Turns off alarm signals . See Alarms section to interpret alarm signals. !. Press and hold Alarm Off pad for 3 seconds to deactivate Door Open alarm. To

reactivate Door Open alarm, press and hold Alarm Off pad for 3 seconds.

2. If Alarm Off pad is pressed and condition

causing alarm is not corrected, alarm will reset .

** Activates Program Mode. See Program Mode section for description of functions available.

1. Open refrigerator door.

2. Press Display On pad.

3. Press * pad.

4. Within 6 seco nds press the following pads in this sequence; Max Ref, Max Frz, Max Ref, Max Frz.

5. T one will sound 3 times and contr ol will be

in program mode A.

Display Off Pad

1. Deactivates control panel

2. Deacti vat es tem per ature in dic at ion area of

control panel.

Electronic Functional Description

Power Disconnect Switch

Use power disconnect switch to disconnect power without unplugging refrigerator. Power disconnect switch is located behind air grille on top right side. Refrigerator is shipped with power disconnect switch in the on position.

Showroom Switch

Showroom switch allows electronic controls and interior lights to function independently of refrigeration system. Showroom switch is located behind air grille to right of control panel. Refrigerator is shipped with showroom switch in the unit run position.

Alarms

Power Up Alarm

After power is initially plugged in, after a power loss, or if power switch is turned off, all temperature indicator lights will flash until Alarm Off or Display On is pressed.

Note

: All settings return to default factory

settings.

Door Open Alarm

Alarm tone sounds and indicator lights blink if either refrigerator or freezer door is open more than 3 minutes.

1. Turn off Door Open alarm by pressing Alarm Off pad or by closing door.

2. Deactivate door open alarm be pressing

Display On pad and then press and hold Alarm Off pad for 3 seconds.

3. Door alarm delay can be adjusted in

Program Mode B.

High Temperature Alarm

Alarm sounds and indicator light shows if freezer or refrigerator temperature has gone above critical level and remains warm for 2 hours. Alarm tone stops if temperature falls again. !. Critical temperature for freezer is +15°F;

for refrigerator critical temperature is +55°F.

2. Press Alarm Off to turn off alarm.

Thermistor Alarm

Alarm sounds and freezer or refrigerator indicator light shows and temperature indicators 4 through 7 will turn on in sequence if either thermistor circuit opens. Refer to Temperature Control Operation Section and Electronic Testing Section. !. Press Alarm Off pad to turn off alarm.

2. Alarm will reset for normal operation. If condition has not been corrected, alarm will sound again.

Electronic Functional Description

Temperature Control Operation

For any temperature setting, outputs will be turned off/on based on cut-in, cut-out temperatures determined by resistance levels of freezer and refrigerator the r mistors.

Refrigerator and Freezer Thermist or

As temperature decreases, resistance increases. As temperature increases, resistance decreases.

Open thermistor or thermistor circuit will result in failure of refrigerator to cool.

Shorted thermistor will cause refrigerator to run 100 percent of time except for defrost cycle.

• Freezer temperature setting and

thermistor value will determine if compressor/condenser fan and evaporator fan switches are open or closed. Compressor/condenser fan switch must be open for 6 minutes before switch can close again (compressor dwell time.)

• Refrigerator temperature setting and

thermistor valve will determine if fresh food fan switch is open or closed.

• Cut-out and cut-in temperature values

must be reached and maintained for 15 minutes before output state will change (digital delay).

• Refrigerator and freezer control

calibration can be adjusted in Program Mode B.

Factory set freezer and refrigerator settings.

Electronic Functional Description

Adaptive Defrost Operation

Defrost occurs after predetermined length of compressor run hours. Compressor run time between defrost changes, or adapts, depending upon recent history of defrost lengths (time it takes for defrost terminator to open after defrost heater has been turned on).

• Defrost terminator opens at 55°F (- 13°C).and closes at 20°F (-7°C).

• Compressor run time between defrost (CRDT) will be one of 3 values under normal operation CRDT 1 (8 hours) or CRDT 2 (12 hours) or CRDT 3 (15 hours).

If defrost length is low (DT-LO defined as 21 minutes) indication small frost load, CRDT for next defrost cycle is advanced to next level.

If defrost length is high (DI-HI defined as 24 minutes) indicating large frost load, CRDT for next defrost cycle is lowered to next level.

If defrost length is between 21 and 24 minutes, CRDT for next defrost cycle remains the same.

Initial value at power up CRDT is 4 hours.

• Vacation Mode CRDT equals 96

hours. Vacation Mode CRDT is interrupted with door openings. Defrost interval will revert back to interval before vacation mode. Three things must occur to reach Vacation Mode CRDT.

1) Defrost interval must be CRDT 3 (16 hours).

2) Both refrigerator and freezer doors must have remained closed since last defrost cycle.

3) Defrost thermostat must have opened in less than 21 minutes during last defrost cycle.

• Six minutes dwell time occurs after

defrost terminator opens before compressor and condenser fan motor will operate. Ten minutes dwell time occurs after defrost terminator opens before evaporator fan motor will operate. Dwell time can be bypassed be disconnecting power to the unit for 30 seconds.

• Conventional defrost can be selected

in Program Mode B.

Program Mode Accessing Program Mode

Two programming modes are available. Mode A allows reading refrigerator and freezer thermistor temperatures. Mode B is used for all other programmable functions.

1. Open refrigerator door.

2. Press Display On pad.

3. Press * pad.

4. Press the following sequence of pads within 6 seconds; Max Ref, Max Frz, Max Ref, Max Frz.

5. When access is granted, tone will sound three times and control will be in Program Mode A. Unmarked indicator light will illuminate.

6. T o ggle to Program Mode B by pressing Display On pad. Unmarked indicator light is off.

EEPROM Update in Control Memory

EEPROM is permanent programmable memory of the control panel.

• Entry tone, door audio alarm and status are

stored in EEPROM after control is deactivated.

• Information stored in EEPROM me mory is

not affected be power loss.

Mode A Function

Reading Temperature Display

Temperature display will show thermistor temperature in binary coded decimal format (BCD).

Indicator lights 1 through 4 represent the ten’s digit with 1 being the most significant bit. Indicator lights 5 through 8 represent one’s digit with 5 being the most significant bit. Positive and negative are shown be indicator light 9. Light glows to show negative value.

Freezer Thermistor Temperature

1. Choose freezer thermistor temperature display be pressing Freezer Temp pad.

2. Freezer thermistor temperature displays.

Refrigerator Thermistor Temperature

1. Choose refrigerator thermistor temperature display be pressing Ref Temp pad.

2. Refrigerator thermistor temperature displays

Mode B Functions

Automatic Keyboard Functions

Activate and deactivate keyboard by toggling Display Off pad. If high temperature indicator glows,

keyboard will disable after 10 minutes. If high temperature indicator is off, keyboard is always enabled. DO NOT LEAVE KEYBOARD IN

ENABLE MODE AFTER PROGRAMMING IS COMPLETE.

Door Alarm Delay

1. Press Alarm Off pad. Door open indicator will glow. One temperature indicator should glow indicating present delay setting in minutes (indicator 1 means 1 minute, 2 means 2 minutes, etc.). Default delay is 3 minutes.

2. Press Warmer pad to decrease delay by 1 minute.

3. Press Colder pad to increase delay by 1 minute.

Max Ref Run Time Duration

1. Press Max Ref pad. Max Ref light will

glow. One temperature indicator should glow indicating present Max Ref run time duration in 2 hour increments (indicator 1 means 2 hours, 2 means 4 hours, etc.) . Default del ay is 10 ho urs.

2. Press Warmer pad to decrease Max Ref

duration by 2 hours.

3. Press Colder pad to increase Max Ref

duration by 2 hours.

Program Mode

Max Frz Run Time Duration

1. Press Max Frz pad. Max Frz light will glow. One temperature indicator should glow indicating present Max Frz run time duration in 4 hour increments (indicator 1 means 4 hours, 2 means 8 hours, etc.) Default delay is 24 hours.

2. Press Warmer pad to decrease Max Frz duration by 4 hours.

3. Press Colder pad to increase Max Frz duration by 4 hours.

Temperature Offset Calibration

Offset amount adjusts temperatures for refrigerator cut-ins and cut-outs by the amount of offset. The chart below shows the indicator and the amount of offset from the factory default setting.

• Setting refrigerator Temperature Offset.

Press Ref Temp pad. Refrigerator indicator and one indicator will glow. Press Warmer pad to move offset to the next warmer setting. Press Colder pad to move to the next colder setting. Factory default refrigerator offset is +2.

• Setting Freezer Temperature Offset

Press Freezer pad. Freezer temperature indicator and one indicator will glow. Press Warmer pad to move offset to the next warmer setting. Press Colder pad to move offset to the next colder setting. Factory default freezer offset is 0.

Defrost Mode Selection

Toggle (*) pad to select adaptive or conventiona l defrost mode. Vacation indicator glows when adaptive defrost has been selected. If vacation indicator is off, conventional defrost is selected. Conventional defrost uses 8 hour CRDT value.

Forced Defrost

Defrost can be forced to start by pressing and holding the Alarm Off pad for 3 seconds. Program changes will be saved permanently in EEPROM and program mode will exit to Run Mode.

Forced Pull down (Compresso r Start )

Compressor start can be forced by pressing and holding Max Frz for 3 seconds. Program changes will be saved permanently in EEPROM. Compressor, evaporator fan, damper heater, and condenser fan will come on.

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. However, no changes will be saved if Program exits automatically.

Electronic Testing

Electronic Testing Mode

Forced Defrost Start

1. Press Display On pad to activate control panel.

2. Simultaneously press and hold Max Ref and

Display Off pads for 3 seconds.

Forced Compressor Start

1. Press Display On pad to activate control panel.

2. Simultaneously press and hold Max Frz and Display Off pad for 3 seconds.

Open Thermistor Detect

1. Press Alarm Off pad to turn off alarm.

1. Check for line voltage on terminal E7 on high voltage board. With refrigerator door open (refrigerator light ON) reading should be 120-VAC. With door closed (refrigerator light OFF) reading should be approximately 0 VAC. If voltage does not change with light switch and light is turning light off and on red/white wire is broken between switch and high voltage board.

2. Check for voltage on terminal E7 on high voltage board. Output voltage should toggle with toggling of light switch. If output voltage does not toggle, high voltage board needs replacing.

3. If terminal 7 on high voltage board changes with opening and closing of door, orange wire in low voltage harness is broken (check for continuity between pin 7 on high voltage board and pin 10 on low voltage board) or low voltage board

2. Alarm will retest for normal operation. If condition has not been corrected, alarm will sound again.

Evaporator Fan Suppression

The evaporator fan will turn off every time either refrigerator or freezer door is open.

To test if this function is operating:

1. Perform forced pull down procedure as noted above--evaporator fan should be on.

2. Open the refrigerator or freezer door-the fan should turn off.

3. Push the light switch off-the evaporator fan should start.

If fan does not toggle off and on when refrigerator light switch is turned off and on it has been determined evaporator fan motor operational, perform following tests to determine failure:

1. Check for line voltage on terminal E8 on high voltage board. With freezer door open, reading should be 120VAC. With door closed, reading should be approximately 0 VAC. If voltage does not change with light switch and light switch is turning light off and on, violet/white wire is broken between switch and high voltage board.

2. Check for voltage on pin 7 on pin connector of high voltage board. Output voltage should toggle with toggling of light switch. If it does not toggle, high voltage board needs replacing.

3. If voltage on pin 7 on pin connector on high

voltage board changes with opening and closing of door, orange wire in low voltage harness is broken (check for continuity between pin 7 on high voltage pin connector and pin 10 on low voltage board) or low voltage board needs replacing.

needs replacing.

Electronic Function Description

WARNING: To avoid electrical shock which can cause severe personal injury or death, disconnect

power to r efrigerator using power swit ch before ser vicing. Wires removed during d isassembly must be replaced on proper terminals to insure earth ground and polarization. After servicing, reconnect power using power switch.

Electronic Function Description

WARNING To avoid electrical shock which can cause severe personal injury or death, disconnect power to refrigerator using power switch before servicing. Wires removed during disassembly must be replaced on proper terminals to insure correct earth ground and polarization. After servicing, reconnect power using power switch

Refrigeration and Defrost Component Checks Made at High Voltage Board

Low voltage board input W1 to D11 approximately -25VDC E10 to E9 (Neutral) or ground approximately 120VDC

Compressor/condenser fan motor “ON” = E4 to E9 (Neutral) or ground approximately 120VDC “OFF” = E4 to E9 (Neutral) or ground

Compressor/condenser fan motor “CLOSED” = R7 to ground approximately -11VDC relay “OPEN” = R7 to ground approximately -25VDC

Evaporator fan motor relay “CLOSED” = R8 to ground approximately -11VDC “OPEN” = R8 to ground approximately -25VDC

Evaporator fan motor “ON” =E2 (Neutral) or ground approximately 120VDC “OFF” = E2 (Neutral) or ground 0VDC

Defrost heater “ON” = E6 to E9 (Neutral) or ground approximately 120VDC “OFF” = E6 to E9 (Neutral) or ground 0VDC

Defrost heater relay “CLOSED” = R9 to ground approximately -11VDC “ OPEN” = R9 to ground approximately -25VDC

Defrost terminator “CLOSED” =E5 to E9 (Neutral) ground approximately 120VDC “OPEN” = E5 to E9 (Neutral) or ground 0VDC

DC fan output voltage from “ON’ = E1 to ground approximately -25VDC high voltage board to fresh food fan “OFF” = E1 to ground 0VDC or condensate evaporator fan

DC fan input voltage “ON” =R10 to ground approximately -11VDC signal to high voltage board from “OFF” = R10 to ground approximately -25VDC low voltage board for fresh food fan and for condensate evaporator

Filament voltage at pin 11 and 12 = less than 5VDC

Wiring Diagram

WARNING To avoid electrical shock which can cause severe personal injury or death,

disconnect power to refrigerator using power switch before servicing. Wires removed during disassembly must be replaced on proper terminals to insure correct earth ground and polarization. After servicing, reconnect power using power switch.

Wiring Schematic

Electronic Function Description

WARNING: To avoid electrical shock which can cause severe personal injury or death, disconnect power to refrigerator using power switch before servicing. Wires removed during disassembly must be replaced on proper ter minals to insure correct grounding and po larization. After servicing, reconnect power using power switch.

Freezer Compartment Theory of Operation

As a freezer thermistor warm, the resistance decreases allowing low voltage signal to be sent to electronic control. Electronic control sends two low voltage signals, one to the compressor relay coil (C1) and one to the evaporator relay coil (E1).

When both relay coils are energized and both relay contacts are closed, high voltage circuits to evaporator fan motor and compressor / condenser fan motor are complete.

As thermistor cools during refrigeration cycle, resistance through thermistor increases blocking low voltage signal to electroni c control interrupting circui t.

Electronic Function Description

WARNING: To avoid electrical shock which can cause severe personal injury or death, disconnect power to refrigerator using power switch before servicing. Wires removed during disassembly must be replaced on proper terminals to insure correct grounding and polarization. After servicing, reconnect power using power switch.

Refrigeration Compartment Theory of Operation

As fresh food thermistor warms, resistance decreases allowing low voltage signal to be sent to the electronic control. El ectronic control sends a low voltage signal, to semiconductor switch for DC fresh food fan and DC condensate evaporator fan.

Both fans begin operating. Fresh food fan circulates freezer air into fresh food compartment. Condensate evaporator fan circuilates air over condensate drain pan aiding in evaporation.

As fresh food thermistor cools, resistance increases blocking low voltage signal to electronic control interrupting circuit to DC fresh food fan and DC condensate evaporation fan.

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Viking VCBB360R, VCBB362R, VCBB360L, VCBB362L Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual