ORPORATION CONSUMER SERVICES TECHNICAL EDUCATION GROUP PRESENTS AM-4 APARTMENT MAINTENANCE SERIES TOP-MOUNT REFRIGERATOR/FREEZERS “OLD DESIGN” 14 cu. ft. “MULLION EVAPORATOR DESIGN” 12 cu. ft. “NEW DESIGN” 14 cu. ft. “MID-LINE DESIGN” 16 thru 22 cu. ft. Job Aid Part No.
INTRODUCTION This Job Aid, “APARTMENT MAINTENANCE SERIES: Servicing Refrigerators,” (Part Number LIT 4322309) has been compiled to provide the most recent information on design, features, operation, troubleshooting and repair procedures of 12 through 22 cu. ft. top-mount refrigerator/freezers. Four distinct series of top-mount refrigerator/freezers will be covered. See Page V for more details: 1) 12 cu. ft.
TABLE OF CONTENTS INTRODUCTION ............................................................................................. II GOALS AND OBJECTIVES ........................................................................... II TO THE INSTRUCTOR/INDEPENDENT STUDENT ...................................... II TABLE OF CONTENTS................................................................................. III SAFETY ..............................................................................................
SAFETY ! WARNING To avoid the risk of electrical shock, property damage, personal injury or death: • The power cord must be plugged into a 3-prong grounding-type wall receptacle, grounded in accordance with the National Electrical Code, ANSI/NFPA 70 - latest edition, and local codes and ordinances. • It is the personal responsibility of the consumer to have a proper 3-prong wall receptacle installed by a qualified electrician. • DO NOT, UNDER ANY CIRCUMSTANCES, REMOVE THE POWER CORD GROUNDING PRONG.
PRODUCT IDENTIFICATION Four distinct series of top-mount refrigerator/freezers will be covered in the Job Aid. Each series can be identified by a number of distinguishing features: A) B) C) D) Air circulation in the freezer compartment Type of condenser Location of the Evaporator Method of outside condensation control Louvers at Front of Freezer Floor 12 cu. ft. “Mullion Evaporator Design” Distinguishing Characteristics: • Air return louvers located at the front of the freezer floor.
-- NOTES -- VI
Section One Mullion Evaporator Design 12 cu. ft. Top-Mount INSTALLATION CONSIDERATIONS Minimum Clearance Measure the opening at the location in which the refrigerator/freezer is to be installed and make sure the following minimum clearance dimensions are followed. Top: At least 3” (7.5cm) clearance between the overhead cabinet and the refrigerator/ freezer top. (Dimension A) (Fig. 1) Sides: At least 1” (2.5cm) clearance on each side of the refrigerator/freezer. (Dimension B) (Fig.
Once the unit is located in the final installed location and the rear of the unit is level, proceed to level the front. NOTE: Using a spirit level, the front of the unit should be ½ bubble higher than the back. 1. Use a flat blade screwdriver to rotate the front roller leveling screws in the appropriate direction to level the unit side to side. (Fig. 3 & 4)) 2. Use a level and check to make sure the rollers are set so the unit is level side to side and ½ bubble higher in front.
DOOR SWING REVERSAL 1. Open the refrigerator door and remove the toe panel at the bottom of the unit. 2. Remove the top hinge. (Fig. 5) 3. Remove the freezer door. 4. Remove the center hinge. (Fig. 5) 5. Remove the refrigerator door. 6. Remove the bottom hinge. (Fig. 5) 7. Lay the freezer door on a flat protected surface and remove the door handle. (Fig. 5) 8. Reinstall the freezer door handle on the opposite side of the door. 9.
THEORY OF OPERATION TEMPERATURE CONTROL Temperature control is provided by an adjustable thermostat located behind the control panel escutcheon in the refrigerator compartment. (Fig. 6) This thermostat influences the temperatures in both the freezer section and the refrigerator section. There is no damper to adjust air flow between the two sections. Fig. 6 DEFROST HEATER The defrost heat is provided by a quartz tube radiant heater (Fig. 7) lying underneath the evaporator coils in the divider mullion.
HEAT LOOP ROUTING The heat loop is routed from the condenser outlet up the right side of the cabinet to the right stile (A). It then loops through the mullion between the refrigerator and freezer sections (B) and up around the freezer section (C & D), where it then returns to component compartment (E) and connects to the sealed system at the filter-drier. (Fig. 9) D C B A E HEAT LOOP Fig. 9 MULLION EVAPORATOR DESIGN 5 12 cu. ft.
COMPONENT ACCESS ! WARNING ELECTRIC SHOCK HAZARD Disconnect the electrical power before servicing any components. Failure to do so can result in death or electrical shock. EVAPORATOR FAN EVAPORATOR DEFROST HEATER BI-METAL CONDENSER THERMOSTAT COMPRESSOR DRIP PAN/ COMPRESSOR BASE Fig. 10 MULLION EVAPORATOR DESIGN 6 12 cu. ft.
Servicing Components in the Compressor Compartment CONDENSER HEAT LOOP HEAT EXCHANGER Fig. 11 CAPILLARY TUBE DRAIN TUBE COMPRESSOR FILTER DRIER COMPONENT TRAY MOUNTING BOLTS The compressor and related components are located at the bottom back of the refrigerator/freezer in an open compartment. DEFROST DRAIN The drain tube from the freezer section is routed down the outside back of the cabinet underneath the condenser to the component tray at the bottom. The component tray serves as the drain pan.
Servicing Components in the Freezer Compartment EVAPORATOR FAN MOTOR EVAPORATOR DEFROST HEATER (Under Evaporator) Fig. 12 CENTER RAIL BRACKET HEAT SHIELD HEAT LOOP Accessing Freezer Compartment Components The center rail covering the mullion between the freezer and refrigerator compartments and the freezer floor must be removed to gain access to components in the freezer compartment. 1. Remove both doors and the center hinge. Also remove the screws on the other side of the center rail. 2.
DEFROST HEATER DRIP COVER WIRE CONNECTOR Fig. 13 BRACKET TABS DEFROST HEATER Servicing the Defrost Heater 1. Disconnect the wire connectors from both ends of the defrost heater. 2. Carefully lift up on the evaporator far enough to expose the defrost heater and drip cover. 3. Carefully bend the tabs on the defrost heater mounting brackets up to release the defrost heater drip cover and remove the drip cover. 4. Remove the defrost heater from the mounting brackets. 5.
WIRING DIAGRAM STRIP CIRCUITS COOLING CYCLE Compressor Circuit (at instant of start) MULLION EVAPORATOR DESIGN 10 12 cu. ft.
Compressor Circuit (running) Defrost Timer Motor Circuit Evaporator Fan Motor Circuit DEFROST CYCLE Defrost Timer and Defrost Heater Circuit REFRIGERATOR LIGHT Refrigerator Light Circuit MULLION EVAPORATOR DESIGN 11 12 cu. ft.
-- NOTES -- MULLION EVAPORATOR DESIGN 12 12 cu. ft.
Section Two Old Design 12 & 14 cu. ft. Top-Mount INSTALLATION CONSIDERATIONS Minimum Clearance Measure the opening at the location in which the refrigerator/freezer is to be installed and make sure the following minimum clearance dimensions are followed. Top: At least 3” (7.5cm) clearance between the overhead cabinet and the refrigerator/ freezer top. (Dimension A) (Fig. 14) Sides: At least 1” (2.5cm) clearance on each side of the refrigerator/freezer. (Dimension B) (Fig. 14) A Back: At least ½” (1.
Once the unit is located in the final installed location and the rear of the unit is level, proceed to level the front. NOTE: When leveling the front of the unit, the front should be ½ bubble higher than the back. 1. Use a flat blade screwdriver to rotate the front roller leveling screws in the appropriate direction to level the unit side to side. (Fig. 16 & 17) 2. Use a level and check to make sure the rollers are set so the unit is level side to side and ½ bubble higher in front.
Door Alignment Occasionally, the refrigerator or freezer doors may need to be realigned. Evidence of improperly aligned doors includes a generally poor appearance of the unit and/or sweating/frosting on both the inside and outside of the cabinet due to poor gasket seal. Fig. 18 1. Check for proper door gasket seal by placing an American dime between the inside of the door and the cabinet. The gap should not be less than, or greater, than then diameter of the dime (11/16”). (Fig. 18) TOP HINGE Cover 2.
Door Swing Reversal Cap 1. Open the refrigerator door and remove the toe panel at the bottom of the unit. 2. Remove the top hinge. (Fig. 20) 3. Remove the freezer door. 4. Remove the center hinge. (Fig. 20) 5. Remove the refrigerator door. 6. Remove the bottom hinge. (Fig. 20) 7. Lay the freezer door on a flat protected surface and remove the door handle. (Fig. 20) 8. Reinstall the freezer door handle on the opposite side of the door. 9.
THEORY OF OPERATION MULLION AND STILE HEATERS All refrigerators have a tendency to sweat around the door openings due to the differences between the ambient room temperature and the cold compartments of the refrigerator. On “Old Design” units low-wattage resistance heaters are installed to the front flange area of the cabinet to help prevent sweating. Stile Heaters Stile heaters are foil-wrapped resistance-type heating elements in the 5 - 30 watt range.
AIR CIRCULATION The evaporator fan circulates air inside the refrigerator and freezer sections. (Fig. 24) Most of the air circulates inside the freezer compartment, and returns to the evaporator from slots in the front and rear of the freezer floor. The return air travels between the floor and the liner, where it joins other return air at the back, flowing beneath the evaporator cover and up through the evaporator coil.
COMPONENT ACCESS Component Location ! WARNING ELECTRIC SHOCK HAZARD Disconnect the electrical power before servicing any components. Failure to do so can result in death or electrical shock. EVAPORATOR FAN EVAPORATOR CONDENSER COLLECTOR PAN COMPRESSOR Fig. 25 OLD DESIGN 19 12 & 14 cu. ft.
Servicing the Defrost Timer and Thermostat Removing the Control Box The Control box is attached to the bottom of the divider wall separating the freezer and refrigerator compartments. The control box contains the defrost timer and the operating thermostat. 1. Remove the two (2) mounting screws securing the front of the control box to the bottom of the separator. (Fig. 26) 2. Pull the control box forward to release the two (2) tabs securing the back of the control box to the bottom of the separator. 3.
Servicing the Thermostat SENSOR TUBE The thermostat is mounted in the cross rail area by two (2) mounting screws. When removing the thermostat the sensing tube will also have to be removed. The sensing tube is routed back to the deffuser. To access the sensing tube, remove the two (2) screws securing the deffuser cover. (Fig. 29) THERMOSTAT Fig. 29 Servicing the Evaporator Fan Access to the Evaporator Fan is possible once the Evaporator Cover has been removed. 1.
Servicing the Defrost Heater The defrost heater is located on the left side and bottom of the evaporator and is held in place by two slotted retainers at the bottom of the evaporator. 1. Release the evaporator from its position by first pulling the two plastic retaining clips from the bosses that secure the evaporator to the heat shield. 2. Gently pull the left end of the evaporator away from the heat shield. Be careful not to kink the evaporator outlet tubing. (Fig. 33) PLASTIC RETAINING CLIPS Fig. 33 3.
Servicing the Mullion Heater The electrical mullion rail heater can be replaced and can be accessed by removing the mullion rail cover. 1. Remove the doors following the procedures described in earlier in this section. 2. Remove the two screws on the opposite side of the mullion from the hinges. 3. Slide one end of the mullion rail cover to the left or right under the cabinet flange enough to free the other end of the cover. 4. Slide the mullion in the opposite direction and remove it from the mullion rail.
WIRING DIAGRAM (Early Mullion & Stile Heater Design) STRIP CIRCUITS (Early Mullion & Stile Heater Design) COOLING CYCLE Compressor Circuit (at instant of start) Compressor Circuit (running) OLD DESIGN 24 12 & 14 cu. ft.
Defrost Timer Motor Circuit Evaporator Fan Motor Circuit DEFROST CYCLE Defrost Heater Circuit Defrost Timer Motor Circuit OLD DESIGN 25 12 & 14 cu. ft.
REFRIGERATOR LIGHT CIRCUIT MULLION HEATER CIRCUIT OLD DESIGN 26 12 & 14 cu. ft.
“OLD DESIGN” 14 cu. ft. TOP-MOUNT WIRING DIAGRAM (Recent Mullion & Stile Heater Design) OLD DESIGN 27 12 & 14 cu. ft.
“OLD DESIGN” 14 cu. ft. TOP-MOUNT STRIP CIRCUITS (Recent Mullion & Stile Heater Design) COOLING CYCLE Compressor Circuit (at instant of start) Compressor Circuit (running) Defrost Timer Motor Circuit Evaporator Fan Motor Circuit OLD DESIGN 28 12 & 14 cu. ft.
DEFROST CYCLE Defrost Heater Circuit BR Defrost Timer Motor Circuit Mullion and Stile Heater Circuit REFRIGERATOR LIGHT CIRCUIT MODULAR ICE MAKER CIRCUIT OLD DESIGN 29 12 & 14 cu. ft.
“OLD DESIGN” 14 cu. ft. TOP-MOUNT WIRING DIAGRAM (Adaptive Defrost Control with Current Mullion & Stile Heater Design) COOLING CYCLE Energizing Electronic Defrost Control OLD DESIGN 30 12 & 14 cu. ft.
Compressor Circuit (at instant of start) ELECTRONIC DEFROST CONTROL Compressor Circuit (at instant of start) ELECTRONIC DEFROST CONTROL Monitoring Compressor Run-Time ELECTRONIC DEFROST CONTROL DEFROST CYCLE Defrost Heater Circuit ELECTRONIC DEFROST CONTROL Monitoring Defrost Heater Run-Time ELECTRONIC DEFROST CONTROL OLD DESIGN 31 12 & 14 cu. ft.
MULLION AND STILE HEATER CIRCUIT ELECTRONIC DEFROST CONTROL EVAPORATOR FAN MOTOR CIRCUIT ELECTRONIC DEFROST CONTROL REFRIGERATOR LIGHT CIRCUIT MODULAR ICE MAKER OLD DESIGN 32 12 & 14 cu. ft.
Section Three New Design 14 cu. ft. Top-Mount INSTALLATION CONSIDERATIONS Minimum Clearance Measure the opening at the location in which the refrigerator/freezer is to be installed and make sure the following minimum clearance dimensions are followed. Top: At least 3” (7.5cm) clearance between the overhead cabinet and the refrigerator/ freezer top. (Dimension A) (Fig. 36) Sides: At least 1” (2.5cm) clearance on each side of the refrigerator/freezer. (Dimension B) (Fig. 36) A Back: At least ½” (1.
Once the unit is located in the final installed location and the rear of the unit is level, proceed to level the front. NOTE: When leveling the front of the unit, the front should be ½ bubble higher than the back. 1. Use a flat blade screwdriver to rotate the front roller leveling screws in the appropriate direction to level the unit side to side. (Fig. 38 & 39) 2. Use a level and check to make sure the rollers are set so the unit is level side to side and ½ bubble higher in front.
Door Alignment Occasionally, the refrigerator or freezer doors may need to be realigned. Evidence of improperly aligned doors includes a generally poor appearance of the unit and/or sweating/frosting on both the inside and outside of the cabinet due to poor gasket seal. 1. Check for proper door gasket seal by placing an American dime between the inside of the door and the cabinet. The gap should not be less than, or greater, than then diameter of the dime (11/16”). (Fig. 40) Fig. 40 TOP HINGE Cover 2.
Door Swing reversal Cap 1. Open the refrigerator door and remove the toe panel at the bottom of the unit. 2. Remove the top hinge. (Fig. 42) 3. Remove the freezer door. 4. Remove the center hinge. (Fig. 42) 5. Remove the refrigerator door. 6. Remove the bottom hinge. (Fig. 42) 7. Lay the freezer door on a flat protected surface and remove the door handle. (Fig. 42) 8. Reinstall the freezer door handle on the opposite side of the door. 9.
THEORY OF OPERATION Heat Loop Routing The heat loop enters the cabinet through a grommet at the bottom and bends to the left side (1). It then angles up to the front of the cabinet (2). At the separator between the refrigerator and freezer compartments, the loop turns right and travels across the mullion (3); then up the right stile (4); across the top mullion (5) and down the left stile (6). The loop then angles back toward the left rear corner of the cabinet (7).
Air Circulation The evaporator fan circulates air inside of the refrigerator and freezer section. (Fig. 45) Most of the air circulates in the freezer compartment, where it travels to the front and passes through the series of slots in the inner floor. The air then travels toward the back of the freezer between the inner floor and the liner, where it passes under the evaporator cover, across the evaporator coils and back into the freezer through a series of slots in the air tower.
COMPONENT ACCESS Component Location ! WARNING ELECTRIC SHOCK HAZARD Disconnect the electrical power before servicing any components. Failure to do so can result in death or electrical shock. AIR TOWER EVAPORATOR FAN EVAPORATOR CONDENSER COLLECTOR PAN COMPRESSOR Fig. 46 NEW DESIGN 39 14 cu. ft.
Removing the Control Box The Control box is attached to the bottom of the divider wall separating the freezer and refrigerator compartments. The control box contains the defrost timer and the operating thermostat. 1. Open the refrigerator door and slide the top shelf out. 2. Remove the hex-head screw for the front of the control box. (Fig. 47) 3. Lower the front of the control box slightly and pull it forward to release the slots in back from the two tabs in the top of the refrigerator compartment liner. 4.
Servicing the Thermostat 1. 2. 3. 4. Pull the knob off the thermostat control. Unclip the sensor tube from the groove at the back of the control box. Lift the thermostat out of the tabs securing it to the control box. Disconnect the three wire connectors from the terminals of the thermostat. NOTE: The inside of the thermostat control knob has a wide and a narrow slot (Fig. 50, Inset). Match these slots with the tabs next to the thermostat shaft and press the knob over the tabs.
PHILLIPS SCREWS PHILLIPS SCREWS Fig. 51 5. Press against the top of the air tower and disengage the two (2) clips from the evaporator cover. Then, lift the tower and pull it forward to release the four (4) hooks and remove the tower. 6. Remove the Phillips screw from the access cover and remove the cover. 7. Slide the ground wire clip off the tab of the evaporator cover. 8.
WHITE WIRE INSET GREEN WIRE RED WIRE FAN MOUNTING SCREW Fig. 53 Servicing the Bi-Metal 1. Unclip the Bi-Metal from the evaporator inlet tube. (Fig. 54) 2. Disconnect the wiring harness plug from the bi-metal connector. BI-METAL HARNESS CONNECTOR INSET Fig. 54 Servicing the Defrost Heater The Defrost Heater can be accessed once the evaporator cover is removed. 1. Disconnect the defrost heater wiring connector from the wiring harness plug. (Fig. 55, Inset) 2.
EVAPORATOR DEFROST HEATER PLUG DEFROST HEATER ELEMENT DISCONNECT HARNESS PLUG EVAPORATOR HEATER BRACKET SLIDE DEFROST HEATER OUT CUT HERE & BEND DOWN DEFROST HEATER DEFROST HEATER INSET Fig. 55 Adjusting the Air Tower The air tower has three temperature slots that allow an increase or decrease in the cold air flow to vary the temperature inside the freezer. If the freezer is too warm or too cold, adjusting the slots in the tower will help correct the problem.
For A Colder Setting See Figure 56 for the following. Carefully raise the top of the rear panel of the air tower just far enough to lift the side tab out of the slot marked “MID,” then slide the panel so that the slot marked “COLDER” is lined up with the tab. Press firmly against the slot in the panel until the tab breaks through the plastic web. For A Warmer Setting See figure 56 for the following.
WIRING DIAGRAM STRIP CIRCUITS COOLING CYCLE Compressor Circuit (at instant of start) NEW DESIGN 46 14 cu. ft.
Compressor Circuit (running) Defrost Timer Motor Circuit Evaporator Fan Motor Circuit DEFROST CYCLE Defrost Heater Circuit PK NEW DESIGN 47 14 cu. ft.
Defrost Timer Motor Circuit REFRIGERATOR LIGHT CIRCUIT MODULAR ICE MAKER CIRCUIT NEW DESIGN 48 14 cu. ft.
Section Four Mid-Line Design 16 thru 22 cu. ft. Top-Mount INSTALLATION CONSIDERATIONS Minimum Clearance Measure the opening at the location in which the refrigerator/freezer is to be installed and make sure the following minimum clearance dimensions are followed. Top: At least 3” (7.5cm) clearance between the overhead cabinet and the refrigerator/ freezer top. (Dimension A) (Fig. 57) Sides: At least 1” (2.5cm) clearance on each side of the refrigerator/freezer. (Dimension B) (Fig. 57) A B B Fig.
Once the unit is located in the final installed location and the rear of the unit is level, proceed to level the front. NOTE: When leveling the front of the unit, the front should be ½ bubble higher than the back. 1. Use a flat blade screwdriver to rotate the front roller leveling screws in the appropriate direction to level the unit side to side. (Fig. 59 & 60) 2. Use a level and check to make sure the rollers are set so the unit is level side to side and ½ bubble higher in front.
Door Alignment TOP HINGE Occasionally, the refrigerator or freezer doors may need to be realigned. Evidence of improperly aligned doors includes a generally poor appearance of the unit and/or sweating/frosting on both the inside and outside of the cabinet due to poor gasket seal. Cover Top Shim Spacer 1. Check for proper door gasket seal by placing an American dime between the inside of the door and the cabinet. The gap should not be less than, or greater, than then diameter of the dime (11/16”). (Fig.
Door Swing reversal Cap 1. Open the refrigerator door and remove the toe panel at the bottom of the unit. 2. Remove the top hinge. (Fig. 62) 3. Remove the freezer door. 4. Remove the center hinge. (Fig. 62) 5. Remove the refrigerator door. 6. Remove the bottom hinge. (Fig. 62) 7. Lay the freezer door on a flat protected surface and remove the door handle. (Fig. 62) 8. Reinstall the freezer door handle on the opposite side of the door. 9.
THEORY OF OPERATION Heat Loop Routing The heat loop enters the cabinet through a grommet at the bottom and bends to the left side (1). It then angles up to the front of the cabinet (2). At the separator between the refrigerator and freezer compartments, the loop turns straight up, traveling behind the left front flange (3); then across the top front flange (4); down the right front flange (5) and across the separator mullion (6). The loop then angles back toward the left rear corner of the cabinet (7).
Air Circulation The evaporator fan circulates air inside of the refrigerator and freezer sections. (Fig. 65) Most of the air circulates inside the freezer compartment, and returns to the evaporator from two directions. The first route is through a series of slots between the evaporator cover and the rear edge of the freezer floor, where it passes under the evaporator cover, and up through the evaporator coil. The second direction is through slots in the front of the freezer floor.
COMPONENT ACCESS Component Location ! WARNING ELECTRIC SHOCK HAZARD Disconnect the electrical power before servicing any components. Failure to do so can result in death or electrical shock. AIR TOWER EVAPORATOR CONTROL BOX DEFROST TIMER THERMOSTAT AIR DAMPER COLLECTOR PAN CONDENSER FAN COMPRESSOR CONDENSER Fig. 66 MID-LINE DESIGN 55 16 thru 22 cu. ft.
Servicing the Defrost Timer and Thermostat Removing the Control Box The control box is attached to the bottom of the divider wall separating the freezer and refrigerator compartments. The control box contains the defrost timer and the operating thermostat. 1. Open the refrigerator door and remove the top shelf. 2. Unclip the air diffuser assembly using a small flat-bladed screwdriver and remove the assembly from the refrigerator. 3.
Servicing the Defrost Timer Early Production Models: 1. Press out on the locking arm and slide the defrost timer out from under the holding tabs. 2. Disconnect the wiring harness plug from the terminals of the defrost timer and remove the defrost timer from the control box. PUSH ON LOCKING ARM TO REMOVE DEFROST TIMER HOLDING TABS DEFROST TIMER CONNECTOR Fig. 69 Current Production Models: 1. Remove the two (2) clips from the pins securing the defrost timer to the control box.
FORM LOOP HERE AIR DAMPER RED WIRE UNCLIP TO REMOVE PULL BRACKET OUT OF SLOT THERMOSTAT INSET ADHESIVE FOAM COVER THERMAL WEIGHT THERMAL WEIGHT ACCESS SLOT ORANGE WIRE SLOT SENSOR TUBE FITS INTO SLOT HERE UNCLIP BRACKET GREEN WIRE Fig. 71 Servicing the Freezer Section Removing the Freezer Light Assembly Early Production Models Some early Production Models of Mid-Line Refrigerators were equipped with a magnetically operated electronic light switching system.
Door Switch Assembly 1. Slide the cover forward on the front of the freezer light assembly and remove it. 2. Remove the screw from the front of the freezer light assembly. Drop the assembly down to work on the components inside the assembly. The wiring harness will remain attached at this point. 3. Slide the electrical shield from the back of the assembly. 4. Both the electronic light switch board and the light socket can be unsnapped from the back of the assembly.
Current Production Models: Current Production Models of Mid-Line Refrigerators are equipped with a rocker switch located at the front of the light switch assembly. 1. Remove the screw from the bottom of the freezer light assembly. (Fig. 74) Drop the assembly down to work on the components inside the assembly. The wiring harness will remain attached at this point. 2. Slide the electrical shield from the back of the assembly. 3.
Removing the Freezer Floor and Evaporator Cover Access to the component behind the evaporator cover and removing the air tower can be accomplished by removing the freezer floor and evaporator cover. Removing the Freezer Floor 1. Remove the ice cube tray, bin and shelf (if present) or remove the automatic ice maker. 2. Remove the two (2) Phillips screws securing the front of the freezer floor to the freezer liner and slide the floor out of the freezer. Removing the Evaporator Cover 1.
Servicing the Evaporator Fan Motor 1. Remove the harness wires from the clips at the top of the fan motor bracket. (Fig. 76) 2. Remove the four (4) hex-head screws securing the fan motor bracket to the rear liner of the freezer. 3. Unplug the three (3) harness wires from the fan motor terminals. (Fig. 76, Inset 1) 4. Remove the two (2) hex washer-head screws securing the fan motor to the bracket and remove the motor.
Servicing the Defrost Heater The Defrost Heater is located behind the evaporator cover, and wraps around the bottom half of the evaporator. The Defrost Heater is a single element with one electrical connection on the left side of the evaporator and the other connection on the right. The wiring harness connector for the Defrost heater is located next to the terminal block on the left side of the rear freezer liner. (Fig. 77) 1.
WIRING DIAGRAM (Neutral Path To Defrost Timer Motor through Defrost Heater and Compressor Run Winding) STRIP CIRCUITS COOLING CYCLE Compressor Circuit (at instant of start) MID-LINE DESIGN 64 16 thru 22 cu. ft.
Compressor Circuit (running) Defrost Timer Motor Circuit Evaporator Fan Motor Circuit Condenser Fan Motor Circuit MID-LINE DESIGN 65 16 thru 22 cu. ft.
DEFROST CYCLE Defrost Heater Circuit PK Defrost Timer Motor Circuit REFRIGERATOR LIGHT CIRCUIT MODULAR ICE MAKER CIRCUIT MID-LINE DESIGN 66 16 thru 22 cu. ft.
WIRING DIAGRAM (Direct Neutral Path to Defrost Timer Motor) MID-LINE DESIGN 67 16 thru 22 cu. ft.
“MID-LINE DESIGN” 16 & 18 cu. ft. TOP-MOUNT STRIP CIRCUITS (Direct Neutral Path to Defrost Timer Motor) COOLING CYCLE Compressor Circuit (at instant of start) Compressor Circuit (running) Defrost Timer Motor Circuit Evaporator Fan Motor Circuit Condenser Fan Motor Circuit MID-LINE DESIGN 68 16 thru 22 cu. ft.
DEFROST CYCLE Defrost Timer and Defrost Heater Circuit REFRIGERATOR LIGHT CIRCUIT MODULAR ICE MAKER MID-LINE DESIGN 69 16 thru 22 cu. ft.
--NOTES -- MID-LINE DESIGN 70 16 thru 22 cu. ft.
Section Five TROUBLESHOOTING AND DIAGNOSIS GENERAL HEAVY WARM LOAD WARM ROOM The amount of warm food placed in the refrigerator affects running time and power consumption. Ordinarily, when a supply of food is placed in a refrigerator, it will operate continuously until the food is down to the desired storage temperature. This continuous operation is normal. In high ambient room temperatures, an excessive warm load may cause overload cycles. 1.
SEALED SYSTEM DIAGNOSIS REVIEW Entering and properly processing the sealed refrigeration system requires special equipment and should only be accomplished by a qualified service technician. Before suspecting that the sealed refrigeration system has failed, be sure to check out all other possibilities as described in the following Troubleshooting Chart on pages 73-79. There are four conditions that make entering the sealed system necessary. 1. 2. 3. 4.
TROUBLESHOOTING CHART PROBLEM CAUSE PROCEDURE Compressor will not start 1.Service cord unplugged 1.Plug in electrical outlet (Parts of this diagnosis and service procedure must be performed by a qualified refrigeration system service technician.) 2.No power at outlet 2.Check to confirm 120VAC, 60 Hz at outlet. 3.Thermostat: a.Turned off b.Points not closed 3. 4.Relay or overload 4.
PROBLEM Compressor runs, but no refrigeration or insufficient refrigeration. (con’t.) (This diagnosis and service procedure must be performed by a qualified refrigeration system service technician.) Compressor stops on overload (Parts of this diagnosis and service procedure must be performed by a qualified refrigeration system service technician.) Freezer compartment too warm (Parts of this diagnosis and service procedure must be performed by a qualified refrigeration system service technician.
PROBLEM Freezer compartment too warm (con’t.) Refrigerator compartment too warm (Parts of this diagnosis and service procedure must be performed by a qualified refrigeration system service technician.) CAUSE PROCEDURE 5.Interior air circulation a.Evaporator Fan not running b.Restriction in air ducts c.Air control open too wide 5. 6.Abnormal use 6.Instruct customer 7.Bad door seal or door not closing 7.a.Adjust door to obtain proper door seal. b.Instruct customer to make sure door closes completely.
PROBLEM Freezer compartment too cold Refrigerator compartment too cold CAUSE PROCEDURE 1.Thermostat a.Set too cold b.Sensing tube not properly positioned c.Out of calibration or not functioning a.Turn knob to lower number. b. See that sensing tube is covered by barrier and properly located. c. Check thermostat for cut-in and cu-tout temperatures, recalibrate or replace. 2.Air control closed 2.Adjust rear panel of air tower. 1.Thermostat a.Set too cold b.Sensing tube not properly positioned 1. a.
DIAGNOSTIC TESTS PROBLEM COMPRESSOR TIMER NOTE: The production timer (Paragon) has a 10 hour cumulative run time with a 21minute defrost duration. The service replacement timer has an 8 hour cumulative run time with a 21-minute defrost duration. PROCEDURE READINGS 1.Touch probes of ohmmeter to M and C terminals 1.Meter should read 1Ω to 5Ω 2.Touch probes of ohmmeter to S and C terminals 2.Meter should read 3Ω to 11Ω 3.
PROBLEM PROCEDURE TIMER (continued) DEFROST MODE NOTE: The production timer (Paragon) has a 10 hour cumulative run time with a 21minute defrost duration. 1.Set the ohmmeter to the Rx1 scale and zero the meter. The service replacement timer has an 8 hour cumulative tun time with a 21-minute defrost duration. READINGS 2.Touch the meter probes to timer terminals PK and BK. The meter should read “zero” resistance (contacts closed). If it reads anything else, replace the timer. 3.
PROBLEM DEFROST HEATER PROCEDURE Locate the test terminals inside the control box. (Brown and Pink wires) Touch the meter probes to the ends of Brown wire and the Neutral side of the plug wires (any White wire terminal.) Meter should read 19Ω to 35Ω nominal resistance. Ground Test: Touch one meter probe to the barrel of the heater and the other to the Brown and White wires. The meter should read “infinity”. Any resistance beyond nominal reading indicates a short circuit. 12 cu. ft.
TYPICAL TESTING PROCEDURES Electromechanical Defrost Timer The Defrost Timer Motor and Switch can be tested in Electromechanical Defrost Timers. To Test the Timer Switch: 1. 2. 3. 4. 5. Disconnect the wiring harness plug from the defrost timer. Rotate the timer cam until you hear a click. (This puts it in the defrost cycle.) Set a volt-ohm meter on Rx1 scale. Place the probes of a VOM on the terminals 1 and 2. The VOM should read continuity. Rotate the timer cam until it clicks a second time.
Thermostat The Thermostat can be tested with an Ohmmeter. To Test the Thermostat: 1. 2. 3. 4. 5. 6. Disconnect the wire connectors from the thermostat terminals. Set it to the ON position. Set the volt-ohm meter to the Rx1 scale. Place the probes of a VOM on the two terminals. The VOM should read continuity. Set it to the OFF position. Place the probes of a VOM on the two terminals. The VOM should read infinity (open circuit).
Evaporator Fan Motor The Evaporator fan motor can be tested with an ohmmeter set on the Rx1K scale. To test the Evaporator Fan Motor: 1. Disconnect the wire connectors from the fan motor terminals. 2. Place the probes on the two outer terminals of the fan motor. 4. The VOM should read approximately 1,100 ohms. 5. Set the VOM to the highest scale to check for shorted windings. Place one probe on one of the outer terminals and the other probe on the motor housing.
Bi-Metal The Bi-Metal can be tested by using the test lead plug located in the control box. The test lead plug is connected to a brown and a pink wire. To Test the Bi-Metal: (All models except Mullion Evaporator Design) 1. Follow the procedure for removing the control box on the specific unit being serviced. 2. Locate the test lead plug (a brown and a pink wire) inside the control box. 3. Set the volt-ohm meter to the Rx1 scale. Be sure the freezer section is at operating temperature (cold). 4.
Defrost Heater (All models except Mullion Evaporator Design) The Defrost heater can be tested with an ohmmeter set on the Rx1K scale. To Test the Defrost Heater: 1. 2. 3. 4. Follow the procedure for removing the control box on the specific unit being serviced. Locate the test lead plug inside the control box. Set the volt-ohm meter to the Rx1 scale. Place one probe of a VOM in the brown wire terminal of the test lead plug. Place the other probe on any white wire connector. The VOM should show continuity.
Testing Start Winding Testing Run Winding Compressor Terminal Configurations S C M(R) M(R) C C Testing for Short to Ground S M 85 S M(R)
Overload The Overload can be tested with an ohmmeter set on the Rx1 scale. To Test the Overload: 1. Locate the overload mounted to the compressor and remove it. Disconnect all wire leads. 2. Set the volt-ohm meter to the Rx1 scale. 4. Place the probes of a VOM on the two wire leads or wire terminals of the overload. The VOM should show continuity at room temperature. Start Relay The Start Relay can be tested with an ohmmeter set on the Rx1 scale. To Test the Current Draw Type Start Relay: 1.
To Test the PTC Type Start Relay: (Test the compressor and overload before performing this test.) 1. Locate the start relay connected to the terminals of the compressor. Pull the relay from the compressor terminals and disconnect all wires. 2. Set the volt-ohm meter to the Rx1K scale. 3. Place the probes of a VOM on terminals numbered 2 and 3. The VOM should show continuity at room temperature. If VOM shows infinity (open circuit) the PTC Start Relay is defective. 4.
CONFIRMATION OF LEARNING EXERCISE Place an X in the blank next to the correct answer(s) to the following servicing situations. 5. If you are testing the start winding of the compressor, what should the meter reading be? 1. The customer complains that the compressor will not start. Which of the following could be the cause of the problem? ____ A. Air obstruction in the back or above the cabinet. ____ A. 1Ω to 5Ω ____ B. 7Ω to 20Ω ____ B. Motor windings open, shorted or grounded. ____ C.
Section Six TECH TIPS REPLACING ELECTROMECHANICAL TIMERS The current universal defrost timer kit (Part No. 482493) will work as a service replacement in units where the timer motor circuit is routed through the run winding of the compressor to neutral and in units where the timer motor circuit is routed directly to neutral. This universal defrost timer kit will replace all 8, 10, 12 and 24-hour timers.
DOOR GASKET REPLACEMENT Beginning in 1993 all Mid-Line Top-Mount Refrigerator/Freezers are equipped with Foamed-In-Place (FIP) doors. FIP refers to the manufacturing process of first assembling the door’s outer panel, inner liner and gasket, and then injecting foam between the outer panel and the inner liner. The gasket is held in place by the lip of the inner liner and the adhesion of the foam.
4. DO NOT PULL ON THE GASKET. This action will pull the interior door liner away from the exterior door panel. To remove the gasket, pull away from the door. 5. With the gasket removed, use a putty knife to clean any debris from between the lip of the inner liner and outer panel. Do not insert the putty knife more than ½”. INSERT KNIFE ½” TO CLEAN OUT DEBRIS Installing a New Gasket: 1.
2. Using your fingers, snap the gasket into place under the lip of the inner liner. If a section of the gasket does not readily tuck under the lip, use a small edged roller or blunt flat object to push the gasket into place. 3. Reinstall and level the door on the refrigerator/freezer. The gap between the door and the cabinet should be 11/16”, or about the diameter of an American dime. Check the gap in several places along each side of the door.
Repair Procecure: 1. Make sure the base of the gasket is tucked under the lip of the inner liner. DO NOT PULL UP ON THE INNER LINER. 2. Gently roll the gasket over to expose the edge of the inner liner and locate the dimples molded into the lip of the inner liner that will be used to locate where the screws will be installed. DIMPLES 3. Drill 1/8” pilot holes at the dimples. NOTE: More than one (1) screw may be needed.
SERVICING THE ADAPTIVE DEFROST CONTROL ! CAUTION STATIC ELECTRICITY DISCHARGE MAY CAUSE DAMAGE • • • TO THIS ELECTRONIC BOARD. Use an anti-static wrist strap. Connect wrist strap to green ground connection point or unpainted metal in the appliance. Touch your finger repeatedly to a green ground connection point or unpainted metal in the appliance. Before removing the part from its package, touch the anti-static bag to a green ground connection point or unpainted metal in the appliance.
The Service Replacement Adaptive Defrost Control may need to be modified when installed in certain refrigerator/freezers. This modification should only be made when replacing Adaptive Defrost Controls with the following Original Part Numbers: • 2154958 • 2169267 • 2169269 Do not follow these instructions for any other Adaptive Defrost Controls with Original Part Numbers other than those listed above. 1. When replacing original part number 2154958, 2169267 or 2169269 the following step must be made: 2.
WHIRLPOOL MODEL NUMBERS Refrigerators (1982 - 1986) E MODEL NUMBER T 14 N MARKET CHANNEL (If Present) PRODUCT GROUP E = Refrigeration PRODUCT IDENTIFICATION T = 2 Door, Top-Mount Freezer CAPACITY 14 = 14 cu. ft.
WHIRLPOOL MODEL NUMBERS Refrigerators (1987 to Present) E MODEL NUMBER T 14 N MARKET CHANNEL (If Present) PRODUCT GROUP E = Refrigeration PRODUCT IDENTIFICATION T = Top-Mount Freezer CAPACITY 14 = 14 cu. ft. MODEL TYPE OR DEFROST METHOD A = Princess-Wire Powder C = Custom Wire Zinc E = Estate H = Variation II - Wire Powder J = Custom - No Frost N = Special - wire O = Promotional Special S = Starter Series - WZ X = Variation I - Wire Powder Y = Promo Spec.
ROPER SERIAL NUMBERS SERIAL NUMBER E E YEAR CODE 03 0= 1= 2= 3= 4= 5= 6= 7= 8= 9= X= A= B= C= D= 10003 MANUFACTURER/LOCATION E = Evansville EW = W.C. Wood VS = Vitro-Supermatic YEAR OF MANUFACTURE WEEK OF MANUFACTURE PRODUCT SEQUENCE NUMBER ROPER MODEL NUMBERS Refrigerators (1989 to Present) R MODEL NUMBER T 14 C MARKET CHANNEL (If Present) PRODUCT GROUP R = Refrigeration PRODUCT IDENTIFICATION T = 2 Door, Top-Mount Freezer CAPACITY 14 = 14 cu. ft.
YEAR CODE ESTATE/HOLIDAY SERIAL NUMBERS SERIAL NUMBER E E 03 10003 0= 1= 2= 3= 4= 5= 6= 7= 8= 9= X= A= B= C= D= MANUFACTURER/LOCATION E = Evansville EW = W.C. Wood VS = Vitro-Supermatic YEAR OF MANUFACTURE WEEK OF MANUFACTURE PRODUCT SEQUENCE NUMBER ESTATE/HOLIDAY MODEL NUMBERS Refrigerators MODEL NUMBER T T 14 C MARKET CHANNEL (If Present) PRODUCT GROUP R = Refrigeration PRODUCT IDENTIFICATION T = 2 Door, Top-Mount Freezer CAPACITY 14 = 14 cu. ft.
ANSWERS TO CONFIRMATION OF LEARNING EXERCISE Section Five TROUBLESHOOTING AND DIAGNOSIS 1. The customer complains that the compressor will not start. Which of the following could be the cause of the problem? 5. If you are testing the start winding of the compressor, what should the meter reading be? ____ A. Air obstruction in the back or above the cabinet. ____ A. 1Ω to 5Ω _X__ B. 7Ω to 10Ω _X__ B. Motor windings open, shorted or grounded. ____ C. Condenser fan not running or too slow. ____ D.
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CORPORATION VIII
