TABLE OF CONTENTS TOOLS NEEDED FOR REPAIRS..................COMPONENT LOCATION Theory of Operation......................4-12 COMPONENTS ACCESS AND REPAIR Components in the Refrigerator Section................ Electronic Control Board..............Light Switch..................Motorized Air Door................Temperature Sensor (Thermistor)........... Meat Locker Control................. Components in the Freezer Compartment Removing Freezer Thermostat............
VIKING RANGE CORP. BUILT-IN REFRIGERATOR / FREEZER Tools Needed For Repair Channel locks or 5/8" open end wrench Medium size Phillips screwdriver Medium & small straight blade screwdriver Needle nose pliers Socket set with medium & long extensions, socket sizes ½" to 1/4"...
The Freezer Compartment The evaporator fan (1) draws air over the evaporator coils (4) located in the lower portion of the freezer compartment. As the air passes over the evaporator, heat is extracted and the cold air travels up the back of the freezer compartment through an air duct (2) to the top of the unit.
Motorized Air Operation A motorized air door regulates the air flow coming from the freezer. The operation of the motorized air door is determined by the following components: • The temperature sensor (thermistor) located on the back wall of the refrigerator cover. •...
Control and Operation The temperature controls in the built-in refrigerator/freezer are designed to regulate temperature more accurately and operate the product more efficiently than freestanding side-by-side refrigerator/freezers. Freezer Thermostat Control The freezer thermostat controls the temperature of the freezer compartment be sensing cold air coming from the cold air duct on the back wall of the freezer liner.
• The electronic control board continuously sends a flow of voltage, or signal current, through the thermistor. The thermistor is sensitive to temperature fluctuations and changes resistance accordingly. When the temperature rises in the refrigerator compartment: • The thermistor resistance decreases, altering the signal going to the electronic control board. •...
Defrost System As air circulates through the refrigerator/freezer, moisture from food and outside air that enters whenever the doors are opened condenses and freezes onto the evaporator coils and fins to form a layer of frost. Periodically the frost must be cleared from the coils so that the air flow is not blocked. An automatic defrost function accomplishes this task with the use of a defrost timer, defrost heater and bimetal.
COMPONENT ACCESS The following information provides specific information on accessing components of the built-in side-by- side refrigerator/freezer. This section will be presented in four parts: • Components in the refrigerator section • Components in the freezer section • Components in the top of the unit •...
Pull the knob from the control shaft. Remove the one-half inch hex nut securing the control shaft to the control box cover. Pry the three plastic caps from the control box cover. Remove the three Phillips head screws securing the control box cover to the top of the cabinet. Rotate the control box cover down to expose the contents of the control box.
Servicing the Motorized Air Door The motorized air door assembly is located in the upper rear left corner of the refrigerator section. Remove the three hex head screws securing the air door cover to the cabinet liner and set the cover aside.
Remove the hex head screw securing the temperature sensor assembly to the back wall of the cabinet liner. Lift the right side of the assembly slightly and unhook the tab on the left end from the slot in the cabinet liner. Unhook the locking arm on the temperature sensor connector from the tab on the wiring harness connector and unplug the connectors.
COMPONENTS IN THE FREEZER COMPARTMENT The components that are accessible in the freezer compartment are: • The freezer thermostat • Light switch • Evaporator fan motor • Bimetal • Defrost heater Servicing the Freezer Thermostat and Light Switch The freezer thermostat and the light switch are located in the control box at the top of the freezer compartment.
6. Remove the three plastic caps that cover the Phillips securing the control box cover to the top of the freezer and remove the screws. 7. Rotate the control box cover so it can be worked on. Once the control box cover is in this position the light switch and thermostat can be serviced.
1. Unplug the yellow and black wire from the switch terminals. 2. Press in on the flexible arm of the switch and pry the opposite side of the switch out of the hole in the corner cover. Servicing Components Behind the Evaporator Cover A number of serviceable components are located behind the evaporator cover located on the lower portion of the back wall of the freezer section.
Remove the two hex head screws from the fan motor bracket. Remove the three wires from the terminals on the fan motor. Remove the two hex head screws securing the fan motor to the mounting bracket and remove the bracket from the motor. If the motor is to be replaced, remove the blades from the motor shaft.
Removing the Defrost Heater The defrost heater is wrapped around the perimeter of the evaporator. Disconnect the heater wire connector from the wiring harness. Remove the foam air-block at the upper right corner of the evaporator from around the evaporator tubing.
Installing a New Defrost Heater Position the defrost heater so the black wire and the wire connector are to the left. Spread the heater apart far enough to fit over the side clips. Bend the bottom tabs securely around the heater. Snap the heater into the side clips on both sides of the evaporator.
COMPONENTS ON TOP OF THE UNIT The components that are accessible on the top of the unit are: • The power switch • Defrost timer • Run capacitor • Water fill valve • Condenser compartment Unit Compartment Access 1. Grasp the decorative grille insert and slide it up to remove it from the grille mounting slots.
Remove the four hex head screws securing the top grille to the mounting brackets. Servicing the Power On / off Switch and Defrost Timer 1. Remove the two hex head screws securing the compartment assembly cover to the component cover. 2.
1. Press the flexible arms against the switch body and push the switch out of the cutout. 2. Disconnect the four wires from the power switch terminals. 3. When installing a new power switch, slide the connectors from the power cord onto terminals six and three of the switch.
Servicing the Condenser Fan Motor With the service tray pulled out the condenser fan motor can be serviced. 1. Remove the two hex head screws at the top of the fan shroud. 2. Loosen, but do not remove the three hex head screws securing the fan shroud flange to the condenser cover. 3.
Servicing the Dual Water Supply Valve The saber valve for the ice maker is located on a mounting bracket to the right of the component compartment at the top of the unit. Be sure to turn off the water supply to the water fill valve before doing any service to the valve.
DOOR ASSEMBLIES Replacing the Door Gaskets 1. Fold the door gasket back and loosen but do not remove the hex head screws all around the perimeter of the door. 2. Pull the lip of the gasket out from under the metal retaining strip and remove the gasket. 3.
TROUBLE SHOOTING AND DIAGNOSIS GENERAL TROUBLE SHOOTING SITUATIONS Heavy Warm Load The amount of warm food placed in the refrigerator affects running time and power consumption. Generally speaking, when a supply of food is placed in the refrigerator, the unit will operate continuously until the food has been cooled down to the desired storage temperature.
DIAGNOSTIC CHART PROBLEM POSSIBLE CAUSE TEST PROCEDURE - ACTION Compressor will not start No power at ON / OFF switch Plug in electrical outlet or turn on breaker. No power at the compressor Press power switch to ON. No power at the outlet Check with test lamp or volt meter.
PROBLEM POSSIBLE CAUSE TEST PROCEDURES-ACTION Compressor runs, but no Permanent restriction First check for moisture restriction. refrigeration or insuf- Check for crimped or damaged tubing. ficient refrigeration Repair or replace restricted component. Low charge or no charge Check for leak. Add leak charge to get internal pressure.
PROBLEM POSSIBLE CAUSE TEST PROCEDURE-ACTION Compressor kicks out on Air circulation on high side: overload (continued) a. Condenser or grille Clean condenser and air passage with vacuum restricted by lint cleaner. b. Condenser fan motor Disconnect fan motor leads and check separ- Running or running ately.
PROBLEM POSSIBLE CAUSE TEST PROCEDURE-ACTION Freezer compartment too High ambient temperature Locate in area our of direct rays of the warm (continued) sun and away from heat registers or Other source of heat. Cabinet light Check to make sure door switch is closed.
PROBLEM POSSIBLE CAUSE TEST PROCEDURE-ACTION Freezer compartment Thermostat: too cold a. Set too cold Turn knob to warmer position b. Sensing tube not properly See that sensing tube is properly positioned positioned. c. Out of calibration or not Check thermostat for cut-in and cut-out functioning temperatures.
PROBLEM POSSIBLE CAUSE TEST PROCEDURE-ACTION Internal Sweating Abnormal usage Instruct customer to cover foods and liquids. Door Seal Adjust door for proper seal. Insufficient air circulation Make sure return air flow is not restricted. Increase cold air flow by operating refrigerator compartment as cold as possible without freezing food.
PROBLEM POSSIBLE CAUSE TEST PROCEDURE-TEST Door will not close or will Gasket binding Adjust hinges, add shims if necessary. Not seal Lubricate face of gasket on hinge side With parawax. Door warped Loosen retainer screws and rack door To fit cabinet. Cabinet racked Level cabinet;...
CHECKING CONTINUITY To make component or wiring measurements, set an ohmmeter’s RANGE switch at R x 1 (unless directed otherwise.) For all “ground” measurements, set the RANGE switch to R x 10k. Insert the ohmmeter probes into the plug pins or against the component terminals as directed in the procedure. COMPONENT TEST PROCEDURE METER READINGS...
COMPONENT TEST PROCEDURE METER READING MOTORIZED Disconnect the wire terminals from Approximately 8800 ohms between the AIR DOOR the motor and touch the ohmmeter W/BR and W wires OR the Y/R and W probes to the connector pins as fol- wires.
COMPONENT TEST PROCEDURE METER READING PTC START The PTC Start Relay cannot be RELAY tested. To determine its reliability, use the following procedure: 1. Measure the R and W wires at The compressor for 120 volts AC. 2. Check the overload relay to make sure there is continuity through It.
COMPONENT TEST PROCEDURE METER READING TIMER (Continued) 1b. Mallory Timer: Touch the Mallory Timer - the meter should meter probes to timer ter- read 6000 ohms to 9000 ohms. minals PK and R (motor windings). The Defrost Mode 1. Set the ohmmeter to Rx1 scale and zero the meter.
R134a REFRIGERANT SERVICE INFORMATION This product uses R134a refrigerant. This refrigerant requires synthetic Ester Oil in the compressor. This cooling system does not tolerate contamination from any of the following: • Other Refrigerants • Moisture • Petroleum-based Lubricants • Silicone Lubricants •...
MODULAR ICE MAKER SERVICE SHEET SPECIFICATIONS Mold Heater 185 watts. 72 ohms close 17°F ± 3° Thermostat open 32°F ± 3° (Bimetal) Water fill 140cc, 7.5 sec. Motor 1.5 watts, 8800 ohms Module stamped circuit. plug in connectors Cycle one revolution (Ejects &...
ADJUST DOOR SWING, if needed. Remove top grill by removing four 1/4" (6 mm) screws located behind the panel assembly. Remove door stop set screw located in top and bottom hinges using a T-15 Torx wrench. Hold door in the desired position and replace set screw.
INSTALLING CUSTOM SIDE PANELS If built-in area depth is 25" (63.5 cm) or more, custom side panels can be installed inside the side trim or attached to the outside of the side trim. If the side panels will be installed inside the side trim and the panels are more then 1/8" (3.2 mm) thick, route front edge of panel to fit side trim piece.