Viking VUWC150 Wine Cooler
Contents
1. Cut In Cut Out Warmest Setting No 38 2 7 RISET 21 Mid Setting No 3 38 1 52 19 4 529 Coldest Setting No 7 38 2 7 6 2 7 e Light bulb is intermediate 15 watt bulb DO NOT use a higher wattage bulb e Optional item F90571 13 WIRING DIAGRAM VUAR VUWC BLACK RIBBED NEUTRAL BLACKE SMOOTH HOT TEMPERATURE CONTROL BLACK COMPRESSOR RELAY SWITCH WHIVEL LIGHT BLUE LIGHT WHITE SWITCH WIRING DIAGRAM VUBD VRBD BLACK SMOOTH BLACK RIBBED NEUTRAL TEMPERATURE CONTROL COMPRESSOR RELAY F90571 14 APPENDEX INSTRUCTIONS FOR FIELD INSTALLATION SOLID STATE AC CONTROLS ON VUAR140 VRBD VUBD 150 VUWC150 ONLY TOOLS NEEDED 5 16 NUT DRIVER AND PHILLIPS SCREW DRIVER 1 Before working on the unit unplug it first 2 Using the Phillips screwdriver remove the screws from the grille on the front of the unit 3 Carefully pull the wires off of the old thermostat 4 Unscrew the thermostat from the bracket 5 Loosen the screw holding the thermobulb clamp on 6 Gently remove the thermobulb away from clamp 7 Go to rear of unit and gently pull the capillary tube from the thermostat out of the unit 8 Set dip switches for the correct unit IIl 1 UNIT UNIT SWITCH SETTING APPLICATION SWITCH SETTING APPLICATION THE REMAINING SWITCH COMBIN ATIONS ARE NOT USED SETTING THE SWITCHES TO AN UNLISTED COM BINATION WILL CAUSE T2. HE UNIT TO NOT WORK F90571 shown in the supplied drawing 10 Plug in molded connector from the power cord to control match up according to the color of the wires 11 Install neutral wire to control SMOODTH WIRE FROM REOWIRE TO COMP PIGGYEACK END RIBBED WIRE FROM Saco O Soke wre WIRE LIGHT Sire WIRE TO COMP BLACK WHITE WIRE FROM POWER CORD RED WIRE FROM MOLDED CONNECTOR 12 Install Potentiometer according to supplied drawing 13 Route wire back and plug into control 14 Feed thermistor from the back and install on evaporator plate 15 Route remaining thermistor wire along insulated tube and cable tie securely 16 Plug thermistor into control 17 Put unit back together TERMINAL BLOCK 5 Red Wire 2 Black Wire 1 White Wire E TO TERMINAL mre ee BLOCK 1 a Temp 2 Range a 411 Tall Fa oe ZE b y WHITE WIRE TERMINAL BLOCK MOLDED CONNECTOR FROM POWER CORD WHITE YELLOw WIRE TO COMP 15
3. N MODELS VUWC140 150 VUAR140 150 VRBD VUBD The all refrigerator product line encompasses traditional all refrigerators beverage storage all refrigerators with temperature barriers to create different temperature zones refrigerator beverage dispensers and wine storage refrigerators All these models employ an evaporator plate for cooling the cabinet interior and an evaporator plate sensing thermostat to control the compressor operation and therefore the interior temperature A cycle defrost system is also used on all these models The plate sensing thermostat is designed such that at the end of each compressor run cycle the evaporator plate must warm up above a freezing temperature before the compressor will restart During this warm up period any accumulated frost on the evaporator melts and drips off the evaporator plate into drip channels and a drip tray From the drip tray a drain tube carries the defrost water to a pan in the mechanical compartment There condenser fan air movement and compressor heat evaporate the water Most Often Misdiagnosed Problem Sealed refrigeration system leaks are the most often misdiagnosed problem on the Viking all refrigerator models The interaction between the evaporator sensing thermostat the mounting location of the thermostat thermobulb and a low refrigerant condition within the evaporator yields a condition in which the cabinet interior air temperature drops below freezing and
4. SERVICE NOTE BOOK ALL REFRIGERATOR MODELS VUAR VRBD VUBD VYUWC VIKING RANGE CORPORATION VIKING RANGE CORPORATION P O DRAWER 956 GREENWOOD 5 38930 USA F90571 TABLE OF CONTENTS General Information 4 Most often Misdiagnosed Problem 4 Troubleshooting Guide 1 Interior too Cool or Contents Freezing 6 2 Interior too Warm Compressor Operates 8 3 Excessive Frost Build up on Evaporator Interior Temperatures Normal and Frost Pattern Uniform 10 4 Compressor Fan and Interior Light do not Function 11 5 Interior Light Functions but Compressor will not Run 12 6 Compressor Runs Fan does not Run 12 7 Fan Runs but Compressor does not Run 12 8 Interior Light will not turn OFF when Door is Closed 12 Thermostat Specifications 13 Wiring Diagram 14 Appendix Solid State Control 15 F90571 VIKING RANGE ALL REFRIGERATIO
5. Typically when 90571 4 Customers complain about a refrigerator operating too cold we don t usually think about a low refrigerant charge or leak A low charge or leak typically causes the opposite problem the interior becomes too warm as the system runs out of cooling capacity The rest of the problem is the unique way some call it the backwards way that the Viking all refrigerator models react to a low refrigerant volume condition When there is a low refrigerant condition in the unit the gas volume is insufficient to fill all the tracks in the plate evaporator As a result areas not filled with gas do not achieve the very cold plate sensing thermostats cut out temperatures Therefore whenever the remaining refrigerant gas volume is not sufficient to fill the area of the evaporator where the thermostat s sensing thermobulb is mounted the compressor runs continuously Usually the cooling capacity of the remaining portion of the evaporator which still contains refrigerant is sufficient to achieve air temperatures below freezing in the unit when the compressor runs continuously Therefore when dealing with plate sensing thermostats as opposed to air temperature sensing thermostats we must adjust our thinking about how the sealed refrigeration system can react to a low or leak condition The conditions described above are representative of a slow leak where the system still retains a partial charge The recommended dia
6. erant refrigerant leak Replace of a uniform charge in the drier evaporator and frost pattern sealed system Recharge sealed Is the frost Refrigerant volume refrigerant system with confined to left is evaporator is not the proper amount of wing and left sufficient to cool charge as listed on the side of the the region of the unit s data plate back Note plate where the compressor evaporator plate should be sensing thermo operating for at stat s thermo bulb least 5 minutes mounts Therefore with door open the control thermo to perform this stat never reaches check See its cut out previous page temperature and for explanation the compressor unique problem Operates 100 of the time The remaining evapor ator volume is sufficient to cool the air temperature below freezing F90571 6 PROBLEM CHECK POSSIBLE CAUSE REMEDY F90571 c Thermostat compressor control thermo bulb mounting or routing d Compressor control thermostat cut out temperature Mounting location incorrect Model VUCW should be on the right wing of the evaporator plate All other models mount at rear top center of the evaporator Thermostat sensing tube capillary tube resting on or above compressor dome in mechanical compartment causing false sensing Thermostat thermo bulb mounting bracket not secure causing false sensing Insufficient thermo bulb contact area on evaporator U shaped loop with 3 inch long legs
7. gnostic approach for complaints of operation too cold on lowest setting is to insure the compressor is operating and then open the unit door Allow the door to remain open for about 5 minutes and observe the frost pattern that forms on the evaporator On a properly charged unit the frost pattern should be continuous and uniform over the entire surface of the evaporator The frost pattern should extend from the left hand wing of the evaporator across the back segment and around to the right hand wing If this frost pattern is present the thermostat or its thermo bulb mount are possible the source of the too cold condition On a unit with a low charge or leak condition the frost pattern if present will typically cover the left wing and perhaps a part of the back It will not be present on the entire back or right wing of the evaporator plate as viewed The thermo bulb mounting location on the VRBD VUBD VUAR is at the top of the evaporator plate on the portion across the rear of the cabinet On the model VUWC the thermo bulb is mounted to the right wing of the evaporator plate as viewed When an incomplete frost pattern is present which does not cover the area where the thermo bulb is mounted the problem is a leak or low refrigerant charge Changing the thermostat will not correct the too cold condition Locating the leak sealing it and evacuation and recharging system is the only permanent solution Leak check all braze joi
8. nal block 11 Reform gasket using heat to achieve a complete seal Replace gasket if stiff or has weak magnetism Straighten area to permit proper seal If unable to achieve proper seal unit is non repairable Reduce frequency and duration of door openings Plug unit into power outlet Replace fuse Reset circuit breaker Correct power supply problem correct loose or incorrect wiring connections PROBLEM CHECK POSSIBLE CAUSE REMEDY 5 Interior a Compressor 1 Compressor control 1 Replace compressor light functions control thermostat control thermostat but compressor thermostat will not run 2 Wiring connections 2 Correct loose or incorrect from compressor control wiring connections Thermostat to terminal Block loose or incorrect Compressor Fan motor 1 Fan blade jammed by 1 Free fan blade so fan runs fan does blade shroud refrigerant line operates freely not run assembly mount bracket foreign objects etc 2 Fan motor failed 2 Replace fan motor 3 Connection loose or 3 Correct loose or incorrect incorrect on wiring from wiring connections fan motor to terminal block 7 Fan runs but PTC starter 1 Failed PTC starter 1 Replace PTC starter b Wiring PTC 1 loose or incorrect 1 Correct loose or incorrect start to wiring connections at wiring terminal PTC starter to terminal block block c Compressor 1 Failed motor in 1 Replace compressor compres
9. nts on the refrigerant tubes and check all sealed system components for the source of the leak Include the tubes themselves the process stub close out welds and the copper to aluminum braze way joints at the evaporator inlet and outlet The braze way welds are difficult to leak check in the cabinet If the rest of the system has been thoroughly checked and no leaks have been found the braze ways are the likely F90571 5 source of a leak The braze ways cannot be brazed repaired The evaporator assembly must be replaced to repair a leak in this area Occasionally corrosion develops under the thermo bulb mounting clamp causing a leak so leak check this area thoroughly Also if this is the leak source replace the evaporator assembly Hopefully this information will help you properly diagnose sealed refrigeration system leak conditions which you encounter on Viking all refrigerator models in the field When these problems are properly diagnosed and promptly repaired the customer the service technician and Viking all benefit TROUBLESHOODTING FOR VIKING ALL REFRIGERATOR AND WINE STORAGE ALL REFRIGERATOR MODELS PROBLEM CHECK POSSIBLE CAUSE REMEDY 1 Interior too Thermostat 1 Thermostat set to 1 Adjust thermostat to warmer cold or setting too cold ofa setting lower number on contents setting for ambient knob freezing conditions The evaporator 1 Refrigerant leak 1 locate and correct cause of for the presence or low refrig
10. out from the grille 3 Excessive Cabinet for 1 Exterior door of unit not 1 Install door shim kit to frost built proper sealing hanging straight correct hang of door Up on absence of preventing proper gasket Evaporator air leaks sealing interior temperatures 2 Door hinges bent 2 Install new hinge kit to are normal correct hang of door and frost Door shims may also be pattern is required See hinge and uniform Shim installation instructions 3 Air leaks at locations 3 Seal around these entry where refrigerant line points with refrigeration electrical wiring or putty permagum to thermostat capillary tubes eliminate air leaks enter cabinet interior F90571 10 PROBLEM CHECK POSSIBLE CAUSE REMEDY Extended or too frequent door openings 4 Compressor a and interior lights don t function Power supply Power cord F90571 and wiring connections within unit from power cord to thermostat and terminal block 4 Air leaks around door gasket due to physical contour of gasket 5 Door gasket torn or has lost magnetism 6 Damage to cabinet front flange gasket sealing area 1 Extended or too frequent door openings allow warm moist air to reach cold evaporator plate causing heavier frost built up Unit not plugged into power outlet Fuses or circuit breaker tripped Loose or incorrect wiring connections at power cord thermostat input or termi
11. pace gap between the rear edge of the glass shelf and the molded shelf supports on the cabinet interior Adjust thermostat to a colder setting higher number on knob Replace thermostat Leak check the sealed Refrigeration system Locate and correct the source of the leak Replace the drier and recharge to proper amount Replace the thermostat with the solid state AC control See appendix 15 1 Leak check sealed refrigeration system locate and correct the source of the leak Replace the drier and recharge to proper amount PROBLEM CHECK POSSIBLE CAUSE REMEDY F90571 c High and low side pressure in the sealed system Interior light does it remain on with door closed adding heat to the 1 Compressor valve failure preventing compressor from developing required refrigerant pressures for system operation Restriction in the sealed refrigerant system causing high compressor discharge pressures and low pressure or vacuum Conditions on the suction side Pressure does not equalize quickly when the compressor is turned off Striker plate on bottom of door not present or not positioned properly to depress light switch in grille area when door is closed Failed light activation switch not turning off light when switch is depressed Wiring connection to or from light activation switch improperly wired bypassing switch Door light activation
12. required bracket Bracket should be located at midpoint of each 3 inch leg Both legs secured under bracket Cut out temperature too low due to internal failure in the thermostat 1 Relocate thermo bulb to proper location Reroute sensing tube clear of compressor dome area Securely tighten thermo bulb mounting bracket Adjust thermo bulb contact area to achieve sufficient contact A U shaped loop with 3 inch long legs is required The mounting bracket should be located at the mid point of each 3 inch leg Both legs secured under bracket 1 Replace the thermostat PROBLEM CHECK POSSIBLE CAUSE REMEDY 2 Interior too warm F90571 e Placement of glass shelves in cabinet a Thermostat the evaporator for the presence of a frost pattern not present with compressor operating 1 If white rubber shelf bumper do not space the glass shelf out away from the molded inner liner shelf supports on the back of the cabinet interior The cold air from the evaporator can be trapped above the the shelf resulting in the area above the shelf becoming too cold and below too warm This applies to models with glass shelves only Thermostat set to too low warm of a setting Thermostat failed cutting compressor off too soon 1 Refrigerant leak 1 Properly place the glass shelves in the unit White rubber shelf bumper must be placed so as to create an air s
13. sor 2 Compressor cycled off 2 Unplug unit Allow on thermal overload compressor to cool 30 45 protector minutes Plug unit in If compressor starts locate cause of thermal overload may be power interruption high ambient temperature or fan condenser blocked 8 Interior light a Striker plate 1 Striker plate not present 1 Replace or install striker will not turn on bottom or not positioned plate so light switch is of door properly to depress light depressed when door is switch when door is closed closed F90571 12 PROBLEM CHECK POSSIBLE CAUSE REMEDY b Light activation 1 Failed light activation 1 Replace light activation switch switch switch Wiring Improperly wired bypass 1 Correct improper wiring connection to switch or over ride connections and from light switch activation switch and over ride switch Position of door 1 If over ride switch is in 1 Place over ride switch in light activation the position instead door position Verify over ride switch of the door position light goes out when door is in the on the light will remain on is closed by depressing position with the door closed light activation switch This is intended for and confirming light goes glass door viewing out with door closed Over ride switch 1 Failed over ride switch 1 Replace over ride switch operation VUAR VRBD VUBD Thermostat F F Knob Setting
14. stored commodities become frozen End users respond to the colder interior temperatures by adjusting the thermostat knob to a warmer setting until they reach the warmest available When their stored commodities continue to freeze at the warmest setting they call for service The end user states the problem as the thermostat is set at its warmest setting yet everything inside freezes This leads most service technicians to suspect a bad thermostat When the technician examines the unit and finds that the compressor runs continuously the tentative diagnosis is confirmed The technician s diagnosis is that the thermostat is not functioning properly and he replaces it When this does not correct the problem often the thermostat is replaced a second time because the technician believes the first replacement thermostat might have also been defective By this time the end user is upset because the technician cannot repair his unit and the technician is contacting the Viking Customer Services Department to inform us that he has received two defective thermostat service assemblies What a mess Let s back up to the beginning to determine where this service call went wrong When the end user stated the problem as the thermostat is set at its warmest setting yet everything inside freezes the technician automatically thought too much run time probably bad thermostat But the problem was actually a low refrigerant charge or leak
15. switch over ride switch in the on position permitting light to remain on with door closed Present on some but not all models 1 Replace compressor and drier evacuate and recharge with refrigerant to the proper amount Locate the restriction and correct the cause Evacuate replace drier and recharge the sealed refrigeration system to the proper level Replace or install striker plate on door so light switch is depressed when door is closed Replace light activation switch Correct improper wiring connection Place over ride switch in the door position Verify light goes out when door is closed by depressing Light activation switch and confirming light goes out PROBLEM CHECK POSSIBLE CAUSE REMEDY Condenser fan 1 Condenser fan blade 1 Free condenser fan blade operation jammed against shroud so it rotates freely or otherwise bound 2 Wiring connection to 2 Correct loose or incorrect and from fan motor wiring connections terminal block and thermostat loose or incorrect 3 Condenser fan motor 3 Replace condenser fan failed Assembly Condenser air 1 Condenser air flow 1 Clean condenser to restore flow blocked blocked by dirt lint air flow or restricted trash etc 2 Air flow in or out of toe 2 Clear restriction to air flow space grille restricted Through toe space grille No obstruction to air flow permitted in an area 3 feet
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