Viking VDSC367, FDSB5421, VCSB5421, FDSB5481 Service Notebook

Service Manual

This manual is to be used by qualied appliance technicians only. Viking does not assume any responsibility for property damage or personal injury for improper service procedures done by an unqualied person.

Built-In Side by Side Non-Dispenser

Preferred Service

This Base Manual covers general and

specic information including, but not

limited to the following models:

Refrigerator / Freezer

FDSB5421

FDSB5481 VCSB5421 VCSB5481

SMR-0020

MAY 2012

Table of Contents

Important Information 3

Safety Information .................................................... 3

Warnings .................................................................. 4

Electrical Requirements ........................................ 4

Tip Over Hazard .................................................... 4

General Information 5

Model - Serial Number Matrix .................................. 5

Operation 6

Settings and Functions ............................................ 6

Electronic Temperature Settings ........................... 6

Key Press Conrmation ........................................ 6

Fast Cool .............................................................. 7

MAX FRZ .............................................................. 7

MAX REF .............................................................. 7

Forced Pull-Down (Forced compressor start) ....... 8

Forced Defrost ...................................................... 8

Showroom Mode .................................................. 9

Sabbath Mode ...................................................... 9

Fahrenheit to Celsius ............................................... 9

Display Panel Operation ........................................ 10

Temperature Control Operation .............................11

Disassembly 12

Parts Location–Control Panel ................................ 12

Upper Grille Assembly ........................................ 13

Control Panel ..................................................... 13

Control Panel (continued) .................................. 14

Overlay Switch .................................................... 14

Overlay Switch (continued) ................................. 15

High Voltage Board ............................................ 15

Low Voltage Board ............................................. 15

Power Disconnect Switch ................................... 16

Inverter ................................................................ 16

Inverter (continued) ............................................ 17

Condenser Fan ................................................... 17

Parts Location–Refrigerator Compartment ............ 18

Light Assembly .................................................... 19

Fresh Food Fan Assembly .................................. 19

Interior Lights ...................................................... 20

Plasma Cluster™ ................................................ 20

Parts Location–Freezer Compartment and Lower

Unit–Non Dispenser ............................................... 21

Ice Maker (shown here with cover off) ................ 22

Thermal Cut Out (TCO) ...................................... 25

Freezer Evaporator Fan ..................................... 25

Freezer Thermistor ............................................. 26

Defrost Heater ................................................... 26

Defrost Terminator ............................................. 28

Float Switch ........................................................ 28

Water Valve ......................................................... 29

Drain Pan Heater ................................................ 29

Service Procedures 30

Program Modes ..................................................... 30

Program Mode A .................................................... 30

Display Ref Temperature .................................... 30

Display Frz Temperature ..................................... 30

Defrost mode selection ....................................... 30

Conventional defrost time adjustment (CRTD) ... 30

Compressor low speed frequency ...................... 31

Adjust Cut-In Hysteresis .................................... 31

Adjust Cut-Out Hysteresis .................................. 32

Display Software Version .................................... 33

Exiting Mode A .................................................... 33

Program Mode B .................................................... 34

Adjust Freezer Temperature Offset ..................... 34

Adjust Refrigerator Temperature Offset .............. 34

Adjust MAX FRZ duration ................................... 35

Adjust MAX REF duration ................................... 35

Adjust FAST COOL duration ............................... 35

Adjust Door Open Alarm delay ........................... 36

Adjust Compressor Dwell Time ........................... 36

Adjust Compressor High Frequency ................... 36

Adjust DC Fan Cycling On Time ......................... 36

Adjust DC Fan Cycling Off Time ......................... 36

Exiting Mode B .................................................... 36

Program Mode C .................................................... 37

Set Model type .................................................... 37

Adjust Freezer Upper Temperature Limit ............ 37

Adjust Freezer Lower Temperature Limit ............ 37

Adjust Refrigerator Upper Temperature Limit ..... 38

Adjust Refrigerator Lower Temperature Limit ..... 38

Defrost lockout adder .......................................... 38

Defrost start delay ............................................... 39

Defrost termination delay .................................... 39

Constant Evaporator fan mode ........................... 39

Plant mode .......................................................... 39

ALARMS ................................................................ 40

1. High Temp Alarm ............................................ 40

2. Open Thermistor Alarm ................................... 40

3. Shorted Thermistor Alarm ............................... 41

4. Power Loss Alarm ........................................... 41

5. Door Open Alarm ............................................ 41

TABLE 1 - Model types ......................................... 42

Door Stop Adjustment ............................................ 43

Light Bulb ............................................................... 43

Door Hinge Adjustment .......................................... 43

Height Adjustment .................................................. 44

Diagnostics 46

VCC3 Inverter Diagnostic Codes ........................... 46

High Voltage Board ................................................ 47

Low Voltage Board ................................................. 48

Troubleshooting Guide ........................................... 49

Wiring Diagrams 52

Wiring and Component Testing .............................. 52

High Voltage Board ................................................ 52

Side by Side schematic .......................................... 53

Side by Side Wiring Diagram ................................. 54

Important Information

SAVE THESE INSTRUCTIONS

REVIEW ALL SERVICE INFORMATION IN THE APPROPRIATE SERVICE MANUAL AND TECHNICAL SHEETS

BEFORE BEGINNING REPAIRS.

Pride and workmanship go into every product to provide our customers with quality products. It is possible, however, that during its lifetime, a product may require service. Products should be serviced only by a qualified service technician that is familiar with the safety procedures required in the repair and who is equipped with the proper tools, parts, testing instruments, and the appropriate service manual.

Safety Information

We have provided many important safety messages in this manual and on the appliance. Always read and obey all safety messages. This is the safety alert symbol.

To avoid risk of serious injury or death, repairs should not be attempted by unauthorized personnel.

WARNING!

This symbol alerts you to hazards that can kill or hurt you and others. All safety messages will be preceded by the safety alert symbol and the word “DANGER”, “WARNING”, or “CAUTION”. These words mean:

DANGER!

IMMEDIATE HAZARDS WHICH WILL RESULT IN SEVERE PERSONAL INJURY OR DEATH.

WARNING!

Hazards or unsafe practices which COULD result in severe personal injury or death.

CAUTION!

VIKING will not be responsible for any injury or property damage from improper service procedures. If performing service on your own product, you must assume responsibility for any personal injury or property damage which may result.

Technical support for authorized servicers:

1-800-914-4799

Address your written correspondence to:

Viking Preferred Service 1803 HWY 82 West Greenwood, MS 38930

Hazards or unsafe practices which COULD result in minor personal injury or product or property damage.

All safety messages will identify the hazard, tell you how to reduce the chance of injury, and tell you what can happen if the instructions are not followed.

Important Information

Warnings

Read and follow all instructions before using this appliance to prevent the potential risk of

re, electric shock, personal injury, or damage

to the appliance as a result of improper usage of the appliance. Use appliance only for its intended purpose as described in this manual.

To ensure proper and safe operation: appliance must be properly installed and grounded by a

qualied technician. DO NOT attempt to adjust,

repair, service, or replace any part of your

appliance unless it is specically recommended

in this manual. All other servicing should be

referred to a qualied servicer.

Make sure that incoming voltage is the same as unit rating. An electric rating plate specifying voltage, frequency, wattage, amperage, and phase is attached to the product.

Electrical Requirements

WARNING!

TIP OVER HAZARD

Appliance is top heavy and tips easily when not completely installed. Keep doors closed until appliance is completely installed and secured per installation instructions.Use two or more people to move and install appliance. Failure to do so can result in death or serious injury.

WARNING!

ELECTRICAL SHOCK HAZARD

Disconnect power or turn power disconnect switch to “OFF” position before removing top grille. Failure to do so can result in death or electrical shock.

WARNING!

Assure that the electrical installation is adequate and in conformance with the National Electrical Code, ANSI/NFPA 70-latest edition or Canadian Electrical Code C22.1-1998 and C22.2 No. 0-M91 (or latest edition), and all local codes and ordinances. A 115 volt, 60-Hz, 15 amp, fused, electrical supply is required. It is required that a separate circuit serving only this appliance be provided. This appliance is equipped with a power supply cord having a 3-prong grounding plug. To minimize possible shock hazard, the cord must be plugged into a mating 3-prong, grounding-type wall receptacle. DO NOT use an extension cord.

Tip Over Hazard

Most of the unit’s weight is at the top. Extra care is needed when moving the unit to prevent tipping. Keep doors closed until appliance is completely installed and secured per installation instructions. Use two or more people to move and install appliance. Failure to do so can result in death or serious injury.

ELECTRICAL SHOCK HAZARD

Plug into a grounded 3-prong outlet. If a 2-prong wall receptacle is encountered, contact a

qualied electrician.

DO NOT remove ground prong. Unit must be grounded at all times. DO NOT use an adapter. DO NOT use an extension cord. Failure to follow these instructions can result in

death, re, or electrical shock.

WARNING!

BURN HAZARD

DO NOT touch condenser coils near defrost pan. Doing so can result in burns.

Model - Serial Number Matrix

VIKING RANGE CORP. LISTED HOUSEHOLD

General Information

V C S B 5 4 8 1 S S

Model Numbers

Serial Numbers

The serial number and model number for your appliance are

located on the identication

plate mounted on the upper left side of the door opening.

Viking Professional Series

Commercial

Side by Side

Built-In

Month

Year of Manufacture

Stainless

Refresh

48" Wide

Version

02 15 12 R1000264

Serial Number

Day

GREENWOOD, MISSISSIPPI 38930 REFRIGERATOR 35NN

MODEL/MODELE FDSB5421SS 6.25OZ R134a NUMBER/NUMERO

SERIAL/SERIE 021512R10000264 115 VAC/60 HZ NUMBER/NUMERO

AMPS: 9.9 PE920095

Operation

Settings and Functions

Power On/Off Switch (Power Interruption Switch) The power on/off switch is located behind your refrigerator’s top grille. It is used to turn the power “OFF” when cleaning the refrigerator or changing the light bulbs. Your refrigerator arrives from the factory with the power interruption switch “ON”.

To turn power “OFF”, remove the center grille blade. Press the power on/off switch to the “OFF” position.

To turn power “ON”, press power on/off switch to the “ON” position. Replace the center grille blade.

Electronic Temperature Settings

When power is first applied to the refrigerator, there will be two dashes displayed as in illustration. After approximately thirty seconds the digital display will change to numbers, indicating temperature in the refrigerator (default upon initial start-up) compartment along with the word REFRIGERATOR and degrees Fahrenheit.

To adjust temperature , enable the key pad controls by pressing and releasing the "ACTIVATE

ACTIVATE

CONTROLS

CONTROLS" pad. Select "REF TEMP" or "FRZ TEMP" pad for applicable section. The

FRZ

TEMP

temperature is then adjusted in that section

HIGHER

LOWER

by pressing "HIGHER or LOWER" pad while observing digital readout.

IMPORTANT: Be sure the power on/off switch is in the “ON” position after cleaning or changing light bulbs.

Key Press Confirmation

The key press confirmation is the "beep" that is heard when a control pad is pressed. This audible confirmation can be made active or

Electronic Temperature Settings

Your refrigerator’s electronic controls are located behind the door above the cabinet interior. To activate the electronic control panel,

ACTIVATE

CONTROLS

press “ACTIVATE CONTROLS” pad. All other pads, except the “Alarm Off” pad, will remain inactive until the ”ACTIVATE CONTROLS” pad is pressed. Once activated, pad remains programmable for at least ten minutes

inactive.

To deactivate the confirmation

ACTIVATE

CONTROLS

beep press and hold "ACTIVATE CONTROLS" pad for three seconds, three long beeps will be heard, confirming deactivation.

To activate the confirmation beep press and hold "ACTIVATE CONTROLS" pad for three seconds, three long beeps will be heard, confirming activation.

Operation

Fast Cool

Fast Cool is enabled by pressing and releasing the "ACTIVATE

ACTIVATE

CONTROLS

CONTROLS" pad and then pressing and releasing the "FAST COOL"pad.

FAST

COOL

This causes the control to temporarily (predetermined time, factory default is 2 hours) replace the freezer setpoint

to Max Frz temperature (factory default -5

F) and also the refrigerator setpoint to Max Ref temperature (factory default 33

F).

Max Frz time duration is adjustable in Program Mode B, range is 1 to 20 hours in 1 hour increments.

The only temperature speed used during this mode of operation is high speed (115HZ).

and releasing the "MAX FRZ" tab.

MAX

FRZ

This causes the control to temporarily (factory setting is 6 hours) change the current freezer set point

F. This set point temperature is not

to -5 adjustable and is programmed from factory.

The time duration is adjustable in Program Mode B, range is 1 to 20 hours in 1 hour increments.

When MAX FRZ is selected, the display illuminates "MAX FRZ" as shown above. The temperature display will move towards that set point temperature (- 5

F) as the unit pulls

down.

When "FAST COOL" is selected by pressing the pad, "FAST COOL" is illuminated on the display as shown in illustration above.

Fast Cool will terminate after the time duration has expired or if another mode is selected or if temperature is increased or decreased by pressing "HIGHER or LOWER" tabs. Fast Cool can be cancelled by pressing "FAST COOL" again, the Fast Cool will extinguish on the display.

MAX FRZ

Max Frz is enabled by pressing and releasing the "ACTIVATE

ACTIVATE

CONTROLS

CONTROLS" pad and then Pressing

Max Frz will terminate at the conclusion of the time duration or if another mode is selected, or if the temperature is manually changed by pressing "HIGHER or LOWER" tabs. Max Frz can also be terminated by again pressing and releasing "MAX FRZ".

The conclusion or termination of this mode is confirmed by "MAX FRZ" extinguishing from display.

MAX REF

Max Ref is enabled by pressing and releasing the "ACTIVATE

ACTIVATE

CONTROLS

CONTROLS" pad and then Pressing and releasing the "MAX FRZ" tab.

MAX

REF

This causes the control to temporarily (factory setting is 4 hours) change

the current refrigerator set point to 33

Operation

This set point temperature is not adjustable and is programmed from factory.

The time duration is adjustable in Program Mode B, range is 1 to 20 hours in 1 hour increments.

When MAX REF is selected, the display illuminates "MAX REF" as shown above. The temperature display will move towards that set point temperature (33o F) as the unit pulls down.

Max Ref will terminate at the conclusion of the time duration or if another mode is selected, or if the temperature is manually changed by pressing "HIGHER or LOWER" tabs. Max Ref can also be terminated by again pressing and releasing "MAX REF".

The conclusion or termination of this mode is confirmed by "MAX REF" extinguishing from display

Forced Pull-Down (Forced compressor start)

This function will ignore compressor dwell time and cause immediate compressor start up in the high speed mode (115HZ).

Forced pull-down will terminate after both cut-out temperatures are met, or if a defrost or forced defrost is initiated, or if an extended power loss occurs.

Forced Defrost

To enter Forced defrost, first press and release "ACTIVATE

ACTIVATE

CONTROLS

CONTROLS", then press and hold "HIGHER" pad, then press and hold "DISPLAY OFF" pad until you get an

HIGHER

audible consisting of three beeps.

This causes the control to

DISPLAY

OFF

immediately suspend all temperature control operations and start a defrost cycle, regardless of compressor dwell time and defrost start delay.

If defrost terminator temperature is satisfied defrost heaters will come on at this time for a normal defrost cycle.

Forced defrost will terminate when defrost terminator opens (completion of cycle defrost) or if forced pull-down is initiated or if there is a long power loss..

To enter Forced pull-down, first press and release "ACTIVATE

ACTIVATE

CONTROLS

CONTROLS", then press and hold "LOWER" pad, then press and hold "DISPLAY OFF" pad also until you

LOWER

get an audible consisting of three beeps.

This causes the control to immediately energize the appropriate outputs in an effort to reach both of the cut-out temperatures (refrigerator and freezer).

DISPLAY

OFF

When forced defrost is initiated the temperature numbers are replaced with "dEF" in the seven segment displays, as shown above. When defrost is complete the displayed "dEF" will again be replaced with displayed temperature numerals.

Showroom Mode

Showroom mode allows electronic controls and interior lights to function independently of the refrigeration system.

Operation

ACTIVATE

CONTROLS

To enter Showroom mode: Press and hold the “ACTIVATE CONTROLS” pad. While holding, press and hold the “HIGHER” and “ALARM OFF” pad simultaneously.

HIGHER

Continue holding until three beeps are heard and then "SHOW" is illuminated along with Refrigerator and 38OF or Freezer and 0OF. Whichever section was active

ALARM

OFF

prior to to showroom mode being entered will determine which one is displayed.

To exit Showroom mode: Press and hold the “ACTIVATE CONTROLS” pad. While holding, press and hold the “HIGHER” and “ALARM OFF” pad simultaneously. Continue holding until three beeps are heard. The display will revert to normal operation

HIGHER

Sabbath Mode

To enter Sabbath mode, press and hold "ACTIVATE CONTROLS" pad

ACTIVATE

CONTROLS

then press and hold "DISPLAY OFF" pad, together for three seconds this will cause an audible

DISPLAY

OFF

three beeps, signifying that Sabbath mode has been entered. When Sabbath mode has been entered the display goes blank except for the "SAB", see illustration below, which will remain illuminated whether the door(s) are open or closed, it will not change state.

Sabbath mode is used to control the refrigerator without interior lights, LED display changes and enunciators. Alarms are suppressed, you will not get visual or audible alarms during Sabbath mode, although they are recorded in memory and will be displayed upon exiting Sabbath mode.

The freezer/refrigerator outputs (compressor, fans,etc.) should not have an immediate reaction from a user action. If the control calls for an action because the door was opened or closed, the control shall delay its reaction randomly (15-25 seconds).

To exit "SABBATH" mode, press and hold "ACTIVATE CONTROLS" and then "DISPLAY OFF" together for three seconds, an audible three beeps will be heard and "SAB" on display will extinguish. The display will return to normal and any alarms will be visually and audibly displayed.

Fahrenheit to Celsius

Factory default for readout is Fahrenheit, to change to Celsius,

ACTIVATE

CONTROLS

press and hold "ACTIVATE CONTROLS" and then press and hold "DISPLAY OFF" for three seconds and

F will change to oC.

DISPLAY

OFF

To change back to Fahrenheit, repeat same steps.

Operation

Display Panel Operation

The unit being serviced has a control panel that allows operation of the unit as well as diagnostic abilities. See the information below for details.

Operation Description How to Access Function

Keyboard Entry Tone Indicates a pad was pressed, com-

mand was read, and accepted

Command Accepted Tone Three short tones sound indicating a

command has been accepted

"ACTIVATE CONTROLS" Pad If the pad is activated, the display

panel remains active at least 10 minutes after the door is closed

"FRZ TEMP" Pad "FREEZER" will light up and buff-

ered freezer temperature will be displayed. Factory setting is 0

"REF TEMP" Pad "REFRIGERATOR" will light up and

buffered refrigerator temperature will be displayed. Factory setting is 38

"HIGHER" Pad Raises temperature settings one

degree at a time

"LOWER" Pad Lowers temperature settings one

degree at a time

"FAST COOL" Pad "FAST COOL" will light up enabling

the fast cool function which changes the freezer set point to max frz and the ref set point to max ref for a factory default of 2 hours.

"MAX RFZ" Pad Sets freezer temperature to coldest

setting (-5

F). Factory setting is 6

hours

"MAX REF" Pad Sets refrigerator temperature to

coldest setting (33

F). Factory set-

ting is 4 hours

"ALARM OFF" Pad Deactivates (partially or fully), audio/

visual alarm signals

"DISPLAY OFF" Pad Deactivates control panel except for

"ACTIVATE CONTROLS" and "DISPLAY OFF" pads

To turn off entry tone, press and hold “ACTIVATE CONTROLS” pad for 3 to 5 seconds

Press the “ACTIVATE CONTROLS” pad

Press “HIGHER” or “LOWER” pad

Press “HIGHER” pad. To raise temperature at a faster rate, hold the pad down

Press “LOWER” pad. To lower temperature at a faster rate hold, the pad down

Press "FAST COOL" pad. A second press will disengage feature.

Press “MAX FRZ” Pad to engage. A second press will disengage feature

Press “MAX REF” pad to engage. A second press will disengage feature

Press “ALARM OFF” to terminate audible alarm, visual alarm indicators will continue to blink until alarm condition is cleared or permanently disabled. To reactivate press and hold “ALARM OFF” pad for 3 seconds.

Press “DISPLAY OFF” pad to deactivate display. Press “ACTIVATE CONTROLS” pad to reactivate

Operation

Temperature Control Operation

For any temperature setting, outputs will be turned off/on based on cut-in/cut-out temperature determined by resistance levels of freezer or refrigerator thermistors.

Refrigerator and Freezer Thermistor (NTC) As temperature decreases, resistance increases. As temperature increases, resistance decreases.

Note: Open thermistor or thermistor circuit or a shorted thermistor will result in refrigerator continuing to cool with error code displayed. The affected section will call for cooling 100 percent of time except during defrost cycle

Deg F Deg C K-Ohms

-24 -31 565

-22 -30 531

-20 -29 499

-18 -28 469

-16 -27 441

-15 -26 415

-13 -25 391

-11 -24 368

-9 -23 347

-8 -22 327

-6 -21 308

-4 -20 291

-2 -19 274

0 -18 259

1 -17 245

3 -16 231

5 -15 218

7 -14 206

9 -13 195

Deg F Deg C K-Ohms

10 -12 185

12 -11 175

14 -10 165

16 -9 157

18 -8 148

19 -7 141

21 -6 133

23 -5 126

25 -4 120

27 -3 114

28 -2 108

30 -1 103

32 0 97

34 1 93

36 2 88

37 3 84

39 4 80

41 5 76

43 6 72

Deg F Deg C K-Ohms

45 7 69

46 8 65

48 9 62

50 10 59

52 11 56

54 12 54

55 13 51

57 14 49

59 15 47

61 16 44

63 17 42

64 18 41

66 19 39

68 20 37

70 21 35

72 22 34

73 23 32

75 24 31

77 25 30

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 value will determine if fresh food switch is open or closed. Cut-out and cut-in temperature values must be reached and maintained for 15 seconds before output state will change (digital delay). Refrigerator and freezer control calibration can be adjusted in Program Mode A.

Disassembly

WARNING!

To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test procedures require power to be connected. Ensure all ground wires are connected before certifying unit as repaired and/or operational.

Parts Location–Control Panel

Upper Grille Assembly

Control Panel

Overlay Switch

Power Disconnect SwitchHigh Voltage Board

Low Voltage Board

Inverter

Disassembly

WARNING!

Upper Grille Assembly

Removal of the upper grille assembly allows access to the control assembly.

1. To remove the upper grille assembly, slide

out the middle air louver.

Middle Air Louver

2. With the middle grille louver removed,

remove the (2) 1/4" hex screws securing the grille assembly.

Control Panel

The control panel has an overlay switch attached to it that allows user input to the control boards.

1. To access the control panel, remove the upper air grill assembly (see Upper Grill Removal section), remove (2) screws securing the control panel.

Screws

Remove 1/4" screw on each side

3. Remove the grille assembly

2. Pull control panel from securing tabs.

Securing tab

3. Lower the control panel. Take caution with the ribbon cable to prevent damage.

Securing tab

Disassembly

WARNING!

Control Panel (continued)

4. Remove the four screws securing the control board cover. Remove control board cover.

5. Disconnect the door switches from the back of the control panel.

7. Remove the two strain relief screws.

8. The control panel can now be removed and the high voltage and low voltage boards are accessible

9. Reverse procedure to reinstall

Overlay Switch

The unit uses an overlay switch to communicate user input to the control boards. The overlay connects to the control board via a ribbon cable.

6. Disconnect the ribbon from the control board.Take caution with the ribbon cable to prevent damage.

1. To replace the overlay switch, remove the upper air grill assembly, remove the control panel (see Air Grill and Control Panel Removal sections, Page 13).

2. Disconnect overlay switch from control.

Overlay Switch

Release tab and pull connector out of socket.

Disassembly

WARNING!

Low Voltage BoardOverlay Switch (continued)

3. Peel overlay off control panel and remove (remove adhesive to ensure replacement overlay adheres properly)

4. Reverse procedure to reinstall.

High Voltage Board

A control board is used to operate functions of the unit. Once an input is received from the low voltage board, the high voltage board sends an output to activate the components.

1. To access the high voltage board, remove the upper air grill assembly, and control panel (see Air Grill and Control Panel Removal sections, Page 13).

2. Compress plastic standoffs securing the high voltage board and pull towards you.

The unit uses a control board in conjunction with an overlay switch to operate functions of the refrigerator/freezer. Interaction with the low voltage board is via the ribbon cable attached to the overlay switch.

1. To access the low voltage board, remove the upper air grill assembly, control panel (see Air Grill and Control Panel Removal sections, Page 13).

2. Compress plastic standoffs securing low voltage board, disconnect wiring and remove.

HV Board

To check low voltage board, refer to chart on Page 48.

High voltage board is now accessible. To check high voltage board, refer to chart on page 47..

3. Reverse procedure to reinstall.

LV Board

3. Reverse procedure to reinstall

Disassembly

DANGER!

WARNING!

Power Disconnect Switch

The unit has a rocker switch, located in the upper right corner of the unit, that allows power to the unit to be turned “OFF” without removal of the unit.

ON/OFF switch has 120 vac connected

to one side of switch at all times, remove

power with circuit breaker box when

removing switch.

1. To access the power disconnect switch, remove the upper air grill assembly (see Air Grill Removal section, Page 13). The power disconnect is now accessible on the right side.

Inverter

The Compressor is operated by a Inverter that varies the voltage to the compressor. This is determined by the frequency input from the low voltage board

1. To access the inverter, remove upper air grill assembly, remove control panel assembly (see Air Grill and Control Panel Removal sections, Page 13).

2. Remove the control box in order to gain easy access to the door hinge area for service. There are 4 ¼” hex screws (2 on each side) holding the control box to the refrigerator housing. Remove these screws.

3. Unplug the 15-pin Molex power plug (A), as well as the 2-wire converter frequency

Verify contacts 4-5 open when the switch is in the “0” position and contacts 4-5 close when in the “|” position. 120 VAC should be measured when in the “0” position and 0 VAC should be measured when in the “|” position.

2. Switch bracket is mounted on electronics box with two 1/4" hex head screws.

3. Reverse procedure to reinstall.

cable (B) and the 3-wire thermistor plug (C).

Molex A

Molex

Molex C

Disassembly

WARNING!

Inverter (continued)

4. The inverter is now accessible on the right side.

Inverter

120 VAC is supplied to the inverter from E4 on the High Voltage Board. The LV board sends 5 VDC to the inverter to operate the compressor.

5. Reverse procedure to reinstall.

3. Unplug the 15-pin Molex power plug, as well as the 2-wire converter frequency cable and the 3-wire thermistor plug . Remove electronics box and set aside to gain access to condenser fan assembly.

4. Remove the three 1/4" hex screws

holding fan assembly in place, remove fan assembly

Condenser Fan

The condenser fan is located in the upper machine compartment of the unit. 120 VDC is supplied to the fan when the Compressor/ Condenser Fan relay closes to E4 on the High Voltage Board.

1. To access the condenser fan assembly, remove upper air grill assembly, remove control panel assembly (see Air Grill and Control Panel Removal sections, Page

13).

Condenser Fan

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