Maytag Amana ASD2324HR Series, Amana ASD2624HE Series, ACD2234HR*ACD2238HT Series, Amana ASD2326HR Series, Amana ASD2622HR Series Service

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Service

This manual is to be used by qualified appliance technicians only. Maytag does not assume any responsibility for property damage or personal injury for improper service procedures done by an unqualified person.

Side-by-Side Refrigerators

This Base Manual covers general information

Refer to individual Technical Sheet

for information on specific models

This manual includes, but is

not limited to the following:

Amana ACD2234HR*

ACD2238HT* ASD2324HR* ASD2326HR* ASD2328HR* ASB2623HR* ASD2622HR* ASD2624HE* ASD2626HE* ASD262RHR*

Jenn-Air

JCB2280HE* JCB2282HT* JCB2282KT* JCD2292HT* JCD2292KT* JCD2295KE* JSD2695KE*

Maytag MSD2351HE*

MSD2355HE* MSD2357HE* MSD2359KE* MSD2655HE* MSD2657HE* MSD2659KE* MZD2665HE* MZD2669KE* PSD263LHR* PSD266LHE* PSD267LHE*

16025628

Replaces 16022689

February 2005

Important Information

Important Notices for Servicers and Consumers

Maytag will not be responsible for personal injury or property damage from improper service procedures. 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 who 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 information. IT IS THE TECHNICIANS RESPONSIBILITY TO

REVIEW ALL APPROPRIATE SERVICE INFORMATION BEFORE BEGINNING REPAIRS.

WARNING

To avoid risk of severe personal injury or death, disconnect power before working/servicing on appliance to avoid electrical shock.

To locate an authorized servicer, please consult your telephone book or the dealer from whom you purchased this product. For further assistance, please contact:

Customer Service Support Center

CAIR Center

Web Site Telephone Number

WWW.AMANA.COM ............................................... 1-800-843-0304

WWW.JENNAIR.COM ............................................ 1-800-536-6247

WWW.MAYTAG.COM............................................. 1-800-688-9900

CAIR Center in Canada..........................................1-800-688-2002

Amana Canada Product .... ....... ....... ........................ 1-866-587-2002

Recognize Safety Symbols, Words, and Labels

DANGER

DANGER—Immediate hazards which WILL result in severe personal injury or death.

WARNING

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

CAUTION

CAUTION—Hazards or unsafe practices which COULD result in minor personal injury, product or property

damage.

Table of Contents

Important Information.................................................... 2

Product Design ............................................................. 4

Component T esting ....................................................... 5

Service Procedures ...................................................... 11

Service Equipment ....................................................11

Drier Replacement .................................................... 11

Refrigerant Precautions.............................................12

Line Piercing V alves ..................................................12

Open Lines ...............................................................12

Compressor Operational T est....................................12

Dehydrating Sealed Refrigeration System .................13

Leak T esting .............................................................13

T esting Systems Cont aining a

Refrigerant Charge .................................................13

T esting Systems Containing

No Re frig eran t Cha rge............................................1 3

Restrictions ...........................................................14

Symptoms.............................................................14

T esting for Restrictions ..........................................14

Evacuation and Charging .......................................15

Evacuation ............................................................. 15

Charging ................................................................16

Refrigerant Charge .................................................16

HFC134a Service Information .................................17

Health, Safety , and Handling..................................17

Comparison of CFC12 and HFC134a Properties.....17

Replacement Service Compressor .........................18

Compressor T esting Procedures ............................18

Brazing ..................................................................18

Refrigerant Flow 22, 23, 26 cu. ft..................................19

Cabinet Air Flow 22, 23, 26 cu. f t..................................20

Ice and Water Flow Diagram ........................................21

Water V alve Diagram....................................................22

Typical External Sweat Pattern...................................23

Troubleshooting Chart................................................24

System Diagnosis........................................................27

Disassembly Procedures .............................................30

Refrigerator Compartment ......................................30

Light Switch...........................................................30

Cold Control,Defrost Timer , Damper Control

Assembly (some models) .....................................30

Freezer Cold Control (some models)......................30

Mid Level Electronic Control (some models) ..........30

Defrost Timer (some models) .................................30

Adaptive Defrost Control (ADC) (some models) ......31

Damper Control (some models) .............................31

Electronic Damper Control (some models) .............31

Fresh Food Thermistor...........................................31

Water Filter Assembly (some models)...................31

Water Tank Assembly (some models)....................31

Crisper Light Cover and Socket..............................31

Freezer Compartment..................................................31

Freezer Light Socket .............................................31

Auger Motor Assembly (some models) ..................32

Auger Motor (some models)...................................32

Auger Motor Capacitor (some models)...................32

Evaporator Fan Motor Assembly ............................32

Evaporator Fan Motor and Fan Blade .....................32

Freezer Thermistor.................................................32

Evaporator Removal ...............................................32

Defrost T erminator (Thermostat) .............................33

Defrost Heater .......................................................33

Ice Maker Removal (some models) ........................33

Machine Compartment .................................................33

Water V alve ...........................................................33

Condenser Fan Motor and Blade............................33

Compressor ...........................................................33

Condensate Drain Tube..........................................34

Condensate Drain Pan ...........................................34

Overload/Relay ......................................................34

Condenser Removal ...............................................34

Bottom Of Cabinet .......................................................34

Front Leveling Rollers ............................................34

Rear Leveling Rollers ............................................. 34

Cabi net Do ors ..............................................................35

Door Gaskets ........................................................35

Dispenser Facade (some models) ........................35

Dispenser Ice Chute Door (some models) ..............35

Dispenser Light Socket (some models) .................35

Dispenser D/C Solenoid (some models).................35

Dispenser Water Tube ...........................................35

Ice ‘N Water Systems..................................................36

Troubleshooting of 5 button electronic

Ice ‘N Water dispenser ..........................................36

Troubleshooting of 3 button electronic

Ice ‘N Water dispenser ..........................................40

Control Board (Mid Level) .............................................43

Programming Mode: ..............................................43

Defrost Operation...................................................43

Forced Defrost Mode .............................................43

Service T est Mode .................................................44

Service T est 1-Defrost Thermostat & Defrost Circuit

Test .......................................................................44

Service T est 2-Compressor/Condenser Fan T est ....45

Service T est 3-Evaporator/Freezer Fan T est ...........45

Service T est 4-Fresh Food Thermistor T est ............45

Service T est 5-Freezer Thermistor Test ..................46

Service T est 6-Open Damper Test ..........................46

Service T est 7-FF Performance Adjustment............46

Service T est 8 FZ Performance Adjustment............47

Show Room Mode .................................................47

Thermistor Resistance Chart..................................47

Control Board (Fully Electronic)....................................48

Programming Mode: ..............................................48

Defrost Operation...................................................48

Forced Defrost Mode .............................................48

Service T est Mode .................................................48

Show Room Mode .................................................51

Sabbath Mode .......................................................51

Fahrenheit or Celsius Mode ...................................51

Cooling Fan Mode..................................................51

Alarm Enable Mode ..............................................52

Light Level Mode (Select Models) ..........................52

Appendix A

Owner’s Manual........ ........................................A-2

Product Design

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. Discharge capacitor through a resistor before attempting to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational.

Refrigeration System

Compressor forces high temperature vapor into fan cooled tube and wire condenser where vapor is cooled and condensed into high pressure liquid by circulation of air across condenser coil. (See Refrigerant Flow Diagram, page 19)

High pressure liquid passes into post-condenser loop which helps to prevent condensation around freezer compartment opening and through molecular sieve drier and into capillary tube. Small inside diameter of capillary offers resistance, decreasing pressure, and temperature of liquid discharged into evaporator. Capillary diameter and length is carefully sized for each system.

Capillary enters evaporator at top front. Combined liquid and saturated gas flows through front to bottom of coil and into suction line. Aluminium tube evaporator coil is located in freezer compartment where circulating evaporator fan moves air through coil and into fresh food compartment.

Large surface of evaporator allows heat to be absorbed from both fresh food and freezer compartments by airflow over evaporator coil causing some of the liquid to evaporate. Temperature of evaporator tubing near end of running cycle may vary from -13° to -25°F.

Saturated gas is drawn off through suction line where superheated gas enters compressor. To raise temperature of gas, suction line is placed in heat exchange with capillary.

Mechanical Defrost System

Every 8 hours of compressor run time defrost timer activates radiant electric defrost heater suspended from evaporator. After 33 minutes of defrost cycle time, timer restores circuit to compressor.

Defrost terminator (thermostat) is wired in series with defrost heater. Terminator opens and breaks circuit when preset high temperature is reached. After defrost thermostat opens, thermostat remains open until end of defrost cycle when cooling cycle starts and terminator senses present low temperature and closes.

Defrost heater is suspended on left side of evaporator coil and across bottom to keep defrost drain free flowing during defrost. Defrost water is caught in trough under evaporator coil and flows through drain hole in liner and drain tubing into drain pan. Air circulated by condenser fan over pan evaporates water.

Mid Level & Fully Electronic Defrost System

The Control Board adapts the compressor run time between defrosts to achieve optimum defrost intervals by monitoring the length of time the defrost heater is on.

After initial power up, defrost interval is 4 hours compressor run time. Defrost occurs immediately after the 4 hours.

Note: Once unit is ready to defrost there is a 4 minute

wait time prior to the beginning of the defrost cycle.

Mechanical Temperature Controls

Freezer compartment temperature is regulated by air sensing thermostat at top front of freezer compartment which actuates compressor. Control should be set to maintain freezer temperature between 0° to -2°F.

Fresh food compartment temperature is regulated by an air damper control governing amount of refrigerated air entering fresh food compartment from freezer. Fresh food compartment temperature should be between 38° and 40°F.

Component Testing

WARNING

Component Description Test Procedures

Compressor

When compressor electrical circuit is energized, the start winding current causes relay to heat. After an amount of starting time, the start winding circuit turns off. The relay will switch off the start winding circuit even though compressor has not started (for example, when attempting to restart after momentary power interruption).

With “open” relay, compressor will not start because there is little or no current to start windings. Overload protection will open due to high locked rotor run winding current.

With “shorted” relay or capacitor, compressor will start and overload protector will quickly open due to high current of combined run and start windings.

With open or weak capacitor, compressor will start and run as normal but will consume more energy.

Resistance test

1. Disconnect power to unit.

2. Discharge capacitor by shorting across terminals with a resistor for 1 minute. NOTE: (Some compressors do not have a run capacitor.)

3. Remove leads from compressor terminals.

4. Set ohmmeter to lowest scale.

5. Check for resistance between Terminals “S” and “C”, start winding Terminals “R” and “C”, run winding

If either compressor winding reads open (infinite or very high resistance) or dead short (0 ohms), replace compressor.

Ground test

1. Disconnect power to refrigerator.

2. Discharge capacitor, if present, by shorting terminals through a resistor.

3. Remove compressor leads and use an ohmmeter set on highest scale.

4. Touch one lead to compressor body (clean point of contact) and other probe to each compressor terminal.

• If reading is obtained, compressor is grounded and must be replaced.

Operation test

If voltage, capacitor, overload, and motor winding tests do not show cause for failure, perform the following test:

1. Disconnect power to refrigerator.

2. Discharge capacitor by shorting capacitor terminals through a resistor.

3. Remove leads from compressor terminals.

4. Wire a test cord to power switch.

5. Place time delayed fuse with UL rating equal to amp rating of motor in test cord socket. (Refer to Technical Data Sheet)

6. Remove overload and relay.

7. Connect start, common and run leads of test cord on appropriate terminals of compressor.

8. Attach capacitor leads of test cord together. If capacitor is used, attach capacitor lead to a known good capacitor of same capacity.

To AC supply

Switch

Compressor

Fuses

CRS

Capacitor

Test configuration

9. Plug test cord into multimeter to determine start and run wattage and to check for low voltage, which can also be a source of trouble indications.

10. With power to multimeter, press start cord switch and release.

• If compressor motor starts and draws normal wattage, compressor is okay and trouble is in capacitor, relay/overload, freezer temperature control, or elsewhere in system.

• If compressor does not start when direct wired, recover refrigerant at high side. After refrigerant is recovered, repeat compressor direct wire test. If compressor runs after recovery but would not run when direct wired before recover, a restriction in sealed system is indicated.

• If compressor does not run when wired direct after recovery, replace faulty compressor.

Component Testing

WARNING

Component Description Test Procedures

Capacitor

Condenser Condenser is a tube and wire

Run capacitor connects to relay terminal 3 and L side of line.

Some compressors do not require a run capacitor; refer to the Technical Data Sheet for the unit being serviced.

construction located in machine compartment.

Condenser is on high pressure discharge side of compressor. Condenser function is to transfer heat absorbed by refrigerant to ambient.

Higher pressure gas is routed to condenser where, as gas temperature is reduced, gas condenses into a high pressure liquid state. Heat transfer takes place because discharged gas is at a higher temperature than air that is passing over condenser. It is very important that adequate air flow over condenser is maintained.

Condenser is air cooled by condenser fan motor. If efficiency of heat transfer from condenser to surrounding air is impaired, condensing temperature becomes higher. High liquid temperature means liquid will not remove as much heat during boiling in evaporator as under normal conditions. This would be indicated by high than normal head pressures, long run time, and high wattage. Remove any lint or other accumulation, that would restrict normal air movement through condenser.

From condenser the refrigerant flows into a post condenser loop which helps control exterior condensation on flange, center mullion, and around freezer door. Refrigerant the flows through the drier to evaporator and into compressor through suction line.

To avoid electrical shock which can cause severe personal injury or death, discharge capacitor through a resistor before handling.

1. Disconnect power to refrigerator.

2. Remove capacitor cover and disconnect capacitor wires.

3. Discharge capacitor by shorting across terminals with a resistor for 1 minute.

4. Check resistance across capacitor terminals with ohmmeter set on “X1K” scale.

• Good—needle swings to 0 ohms and slowly moves back to infinity.

• Open—needle does not move. Replace capacitor.

• Shorted—needle moves to zero and stays. Replace capacitor.

• High resistance leak—needle jumps toward 0 and then moves back to

constant high resistance (not infinity).

Leaks in condenser can usually be detected by using an electronic leak detector or soap solution. Look for signs of compressor oil when checking for leaks. A certain amount of compressor oil is circulated with refrigerant.

Leaks in post condenser loop are rare because loop is a one-piece copper tube. For minute leaks

1. Separate condenser from rest of refrigeration system and pressurize condenser up to a maximum of 235 PSI with a refrigerant and dry nitrogen combination.

2. Recheck for leaks.

To avoid severe personal injury or death from sudden eruption of high pressures gases, observe the following:

Protect against a sudden eruption if high pressures are required for leak checking. Do not use high pressure compressed gases in refrigeration systems without a reliable pressure regulator and pressure relief valve in the lines.

WARNING

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2005 Maytag Services

Component Testing

WARNING

Component Description Test Procedures

Overload / Relay When voltage is connected and relay is

Freezer temperature control

Control board

Ice Maker Optional on some models.

ECM condenser motor

Evaporator fan motor

cool, current passes through relay to start winding.

After a short time, current heats the resistor in relay and resistance will rise blocking current flow through relay.

Start winding remains in the circuit through run capacitor.

Solid state relay plugs directly on compressor start and run terminals. Relay terminals 2 and 3 are connected within relay. Run capacitor is connected to relay terminal 3. L2 side of 120 VAC power is connected to relay terminal 2. Freezer temperature control is a capillary tube operating a single pole, single throw switch.

Freezer temperature control controls run cycle through defrost timer.

Altitude Adjustment When altitude adjustment is required on a G.E. control, turn altitude adjustment screw 1/7 turn counter clockwise for each 1,000 feet increase in altitude up to 10,000 feet. One full turn equals 10,000 feet maximum.

In most cases the need for altitude adjustments can be avoided by simply turning temperature control knob to colder setting.

On some models. See “Control Board” section for

troubleshooting information.

See “Ice Maker” section for service information. Condenser fan moves cooling air across condenser coil and compressor body.

Condenser fan motor is in parallel circuit with compressor.

Evaporator fan moves air across evaporator coil and throughout refrigerator cabinet.

1. Disconnect power to the refrigerator.

2. Remove relay cover and disconnect leads.

3. Check resistance across terminals 2 and 3 with an ohmmeter: Normal = 3 to 12 ohms Shorted = 0 ohms Open = infinite ohms

Check for proper calibration with thermocouple capillary in air supply well by recording cut-in and cut-out temperatures at middle setting. Refer to tech sheet for model being serviced for expected temperatures.

Check control contacts are opening by disconnecting electrical leads to control and turning control knob to coldest setting. Check for continuity across terminals.

Altitude Counter in Feet

Feet Above Sea Level

2,000 4,000 6,000 8,000 10,000

Check resistance across coil.

1. Disconnect power to unit.

2. Disconnect fan motor leads.

3. Check resistance from ground connection solder. Trace to motor frame must not exceed .05 ohms.

4. Check for voltage at connector to motor with unit in refrigeration mode and compressor operating.

Turn Screw Clockwise (Angular Degrees)

30 81 129 174 216

330

300

270

240

210

180

120

150

Component Testing

WARNING

Component Description Test Procedures

Refrigerator light switch

Freezer light / Interlock switch

Drier

Defrost timer Timer motor operates only when freezer

Adaptive defrost control (ADC)

Single pole, single throw switch completes circuit for light when door is open.

Single pole, Double throw switch completes circuit for light when door is open. Completes circuit for dispenser when door is closed

Drier is placed at post condenser loop outlet and passes liquefied refrigerant to capillary.

Desiccant (20) 8 x 12 4AXH - 7 M>S> Grams

control is closed. After specified amount of actual

operating time, inner cam in timer throws the contacts from terminal 4, compressor circuit, to terminal 2, defrost thermostat/defrost heater circuit. After specified defrost cycle time, timer cam resets the circuitry through terminal 4 to compressor.

The ADC adapts the compressor run time between defrosts to achieve optimum defrost intervals by monitoring the cold control and length the defrost heater is on.

Check resistant across terminals. Switch arm depressed “NO” terminals Open

Switch arm up “NO” terminals Closed

Check resistant across terminals. Switch arm depressed “NO” terminals Open

Switch arm not depressed “NC” terminals Open “NO” terminals Closed

Drier must be changed every time the system is opened for testing or compressor replacement. NOTE: Drier used in R12 sealed system is not interchangeable with

drier used in R134a sealed system. Always replace drier in R134a system with Amana part number B2150504.

Before opening refrigeration system, recover HFC134a refrigerant for safe disposal.

1. Cut drier out of system using the following procedure. Do not unbraze drier.

2. Applying heat to remove drier will drive moisture into the system.

3. Score capillary tube close to drier and break.

4. Reform inlet tube to drier allowing enough space for large tube cutter.

5. Cut circumference of drier 1 ¼" below condenser inlet tube joint to drier.

6. Remove drier.

7. Apply heat trap paste on post condenser tubes to protect grommets from high

8. Unbraze remaining part of drier. Remove drier from system.

9. Discard drier in safe place. Do not leave drier with customer. If refrigerator is

1. To check timer motor winding, check for continuity between terminals 1 and 3

2. Depending on rotating position of the cam, terminal 1 of timer is common to

3. With continuity between terminals 1 and 4, rotate timer knob clockwise until

4. Continuing to rotate time knob until a second click is heard should restore

Refer to specific Technical Data Sheet with unit for troubleshooting procedure.

”NC” terminals Closed

heat.

under warranty, old drier must accompany warranty claim.

WARNING

To avoid death or severe personal injury, cut drier at correct location. Cutting drier at incorrect location will allow desiccant beads to scatter. If spilled, completely clean area of beads.

of timer. both terminal 2, the defrost mode, and terminal 4, the compressor mode.

There should never be continuity between terminals 2 and 4. audible click is heard. When the click is heard, reading between terminals 1

and 4 should be infinite and there should be continuity between terminals 1 and 2.

circuit between terminals 1 and 4.

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Component Testing

•

WARNING

Water valve

Evaporator Inner volume of evaporator allows liquid

Evaporator defrost heater

Thermostat

Thermistor

Description Test Procedures

Controls water flow to the ice maker. Controlled by thermostat in ice maker. See Ice Maker Section for further

information.

refrigerant discharged from capillary to expand into refrigerant gas.

Expansion cools evaporator tube and fin temperature to approximately -20°F transferring heat from freezer section to refrigerant.

Passing through suction line to compressor, the refrigerant picks up superheat (a relationship between pressure and temperature that assures complete vaporization of liquid refrigerant) as the result of capillary tube soldered to suction line.

Refrigerant gas is pulled through suction line by compressor, completing refrigeration cycle.

Activated when defrost thermostat, defrost timer, and freezer control complete circuit through heater.

Thermostat is in a series circuit with terminal 2 of defrost timer, and defrost heater. Circuit is complete if evaporator fan motor operates when cold.

Controls the circuit from freezer thermostat through defrost terminator to defrost heater. Opens and breaks circuit when thermostat senses preset high temperature.

Temperature sensing device Check resistance across leads.

Check resistance across coil windings.

Test for leaks in evaporator with electronic leak detector or with soap solution. Compressor oil is circulated with refrigerant; check for oil when checking for leaks.

For minute leaks

1. Separate evaporator from rest of refrigeration system and pressurize evaporator up to a maximum of 140 PSI with a refrigerant and dry nitrogen combination.

2. Recheck for leaks.

WARNING

To avoid severe personal injury or death from sudden erruption of high pressurres gases, observe the following:

Check resistance across heater. To check defrost system :

1. Thermocouple defrost thermostat and plug refrigerator into wattmeter.

2. Turn into defrost mode. Wattmeter should read specified watts (according to Technical Data Sheet).

3. When defrost thermostat reaches specified temperature ±5°F (see Technical Data Sheet), thermostat should interrupt power to heater.

Test continuity across terminals. With power off and evaporator coil below freezing, thermostat should show

continuity when checked with ohmmeter. See “Heater, evaporator (defrost)” section for additional tests.

After defrost thermostat opens, thermostat remains open until end of defrost cycle and refrigerator starts cooling again. Defrost thermostat senses a preset low temperature and resets (closes).

Temperature Resistance 77°F 10,000 ohms 36°F 29,500 ohms 0°F 86,300 ohms

Component Testing

WARNING

Electric damper control

Damper Control Damper control balances the air delivery

Convection Fanl

Damper control balances the air delivery between refrigerator and freezer compartments providing temperature control for refrigerator Electrical voltage activates damper control and door closes restricting flow of air from freezer compartment to refrigerator compartment.

between refrigerator and freezer compartments providing temperature control for refrigerator.

Internal capillary activates damper control and door closes restricting flow of air from freezer compartment to refrigerator compartment.

Convection Fan recirculates air in the fresh food compartment to help improve balance of temperatures in the fresh food compartment.

Check resistance across terminals. If no resistance across terminals replace damper control.

Subject capillary to appropriate temperature (refer to Technical Data Sheet for model being serviced).

Damper door should close to within ¼ If altitude adjustment is required, turn altitude adjustment screw 1/8 turn

clockwise for each 1,000 feet increase in altitude. There are no electrical connections to damper control. See Technical Data Sheet

for damper specifications for unit being serviced. Check resistance across terminals.

If no resistance across terminals replace convection fan control.

" of completely shut.

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Service Procedures

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. Discharge capacitor through a 10,000 ohm resistor before attempting to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational.

Service Equipment

Listed below is equipment needed for proper servicing of HFC134a systems. Verify equipment is confirmed by manufacturer as being compatible with HFC134a and ester oil system.

Equipment must be exclusively used for HFC134a. Exclusive use of equipment only applies to italic items.

• Evacuation pump Check with vacuum pump supplier to verify equipment is compatible for HFC134a. Robinair, Model 15600

2 stage, 6 cubic feet per minute pump is

recommended.

• Four-way manifold gauge set, with low loss hoses

• Leak detector

• Charging cylinder

• Line piercing saddle valve

(Schroeder valves). Seals must be HFC134a and ester oil compatible. Line piercing valves may be used for diagnosis but are not suitable for evacuation or charging, due to minute holes pierced in tubing. Do not leave mechanical access valves on system. V alves eventually will leak. Molecules of HFC134a are smaller than other refrigerants and will leak where other refrigerants would not.

• Swagging tools

• Flaring tools

• T ubing cutter

• Flux

• Sil-Fos

• Silver solder

• Oil for swagging and flaring

Use only part # R0157532

• Copper tubing

Use only part # R0174075 and # R0174076

• Dry nitrogen

99.5% minimum purity , with -40°F or lower dew point

• Crimp tool

• Tube bender

• Micron vacuum gauge

• Process tube adaptor kit

• Heat trap paste

• ICI appliance grade HFC134a

Drier Replacement

Before opening refrigeration system, recover HFC134a refrigerant for safe disposal.

Every time sealed HFC134a system is repaired, drier filter must be replaced with, part # B2150504.

Cut drier out of system by completing the following steps. Do not unbraze drier filter. Applying heat to remove drier will drive moisture into system.

WARNING

To avoid risk of severe personal injury or death, cut drier at correct location. Cutting drier at incorrect location will allow desiccant beads to scatter. Completely clean area of beads, if spilled.

1. Score capillary tube close to drier and break.

2. Reform inlet tube to drier allowing enough space for large tube cutter.

3. Cut circumference of drier at 1-1/4", below condenser inlet tube joint to drier.

4. Remove drier.

5. Apply heat trap paste on post condenser tubes to protect grommets from high heat.

6. Unbraze remaining part of drier. Remove drier from system.

7. Discard drier in safe place. Do not leave drier with customer. If refrigerator is under warranty, old drier must accompany warranty claim.

Service Procedures

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. Discharge capacitor through a 10,000 ohm resistor before attempting to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational.

Refrigerant Precautions

WARNING

To avoid risk of personal injury, do not allow refrigerant to contact eyes or skin.

CAUTION

To avoid risk of property damage, do not use refrigerant other than that shown on unit serial number identification plate.

NOTE: All precautionary measures recommended by

refrigerant manufacturers and suppliers apply and should be observed.

Line Piercing Valves

Line piercing valves can be used for diagnosis, but are not suitable for evacuating or charging due to holes pierced in tubing by valves.

NOTE: Do not leave line piercing valves on system.

Connection between valve and tubing is not hermetically sealed. Leaks will occur.

Open Lines

During any processing of refrigeration system, never leave lines open to atmosphere. Open lines allow water vapor to enter system, making proper evacuation more difficult.

Compressor Operational Test

(short term testing only) If compressor voltage, capacitor, overload, and motor

winding tests are successful (do not indicate a fault), perform the following test:

1.Disconnect power to unit.

2.Discharge capacitor by shorting capacitor terminals through a resistor.

NOTE: Not all units have run capacitor.

3.Remove leads from compressor terminals.

4.Attach test cord to compressor windings.

• Common lead on test cord attaches to C terminal

on compressor.

• Start lead on test cord attaches to S terminal on

compressor.

• Run lead on test cord attaches to M terminal on

compressor.

To AC supply

Switch

Compressor

Fuses

Attaching Capacitor for Compressor Test

5. Connect a known good capacitor into circuit as shown above. For proper capacitor size and rating, see technical data sheet for unit under test.

NOTE: Ensure test cord cables and fuses meet

specifications for unit under test (see Technical Sheet for unit under test).

6. Replace compressor protector cover securely .

7. Plug test cord into outlet, then press and release start cord switch.

CAUTION

To avoid risk of damage to compressor windings, immediately disconnect (unplug) test cord from power source if compressor does not start. Damage to compressor windings occurs if windings remain energized when compressor is not running.

If compressor runs when direct wired, it is working properly. Malfunction is elsewhere in system.

If compressor does not start when direct wired, recover system at high side. After the system is recovered, repeat compressor direct wire test.

If compressor runs after system is recovered (but would not operate when wired direct before recovery) a restriction in sealed system is indicated.

If motor does not run when wired direct after recovery, replace faulty compressor.

CRS

Capacitor

Service Procedures

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. Discharge capacitor through a 10,000 ohm resistor before attempting to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational.

Dehydrating Sealed Refrigeration System

Moisture in a refrigerator sealed system exposed to heat generated by the compressor and motor reacts chemically with refrigerant and oil in the system and forms corrosive hydrochloric and hydrofluoric acids. These acids contribute to breakdown of motor winding insulation and corrosion of compressor working parts, causing compressor failure.

In addition, sludge, a residue of the chemical reaction, coats all surfaces of sealed system, and will eventually restrict refrigerant flow through capillary tube.

To dehydrate sealed system, evacuate system (see paragraph Evacuation).

Leak Testing

DANGER

To avoid risk of serious injury or death from violent explosions, NEVER use oxygen or acetylene for pressure testing or clean out of refrigeration systems. Free oxygen will explode on contact with oil. Acetylene will explode spontaneously when put under pressure.

Testing Systems Containing No Refrigerant Charge

1. Connect cylinder of nitrogen, through gauge manifold, to process tube of compressor and liquid line strainer.

2. Open valves on nitrogen cylinder and gauge manifold. Allow pressure to build within sealed system.

3. Check for leaks using soap suds.

If a leak is detected in a joint, do not to attempt to repair by applying additional brazing material. Joint must be disassembled, cleaned and rebrazed. Capture refrigerant charge (if system is charged), unbraze joint, clean all parts, then rebraze.

If leak is detected in tubing, replace tubing. If leak is detected in either coil, replace faulty coil.

It is important to check sealed system for refrigerant leaks. Undetected leaks can lead to repeated service calls and eventually result in system contamination, restrictions, and premature compressor failure.

Refrigerant leaks are best detected with halide or electronic leak detectors.

Testing Systems Containing a Refrigerant Charge

1. Stop unit operation (turn refrigerator of f).

2. Holding leak detector exploring tube as close to system tubing as possible, check all piping, joints, and fittings.

NOTE: Use soap suds on areas leak detector cannot

reach or reliably test.

Service Procedures

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. Discharge capacitor through a 10,000 ohm resistor before attempting to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational.

Restrictions

Symptoms

Restrictions in sealed system most often occur at capillary tube or filter drier, but can exist anywhere on liquid side of system.

Restrictions reduce refrigerant flow rate and heat removal rate. Wattage drops because compressor is not circulating normal amount of refrigerants.

Common causes of total restrictions are moisture, poorly soldered joints, or solid contaminants. Moisture freezes at evaporator inlet end of capillary tube. Solid contaminants collect in filter drier.

If restriction is on low side, suction pressure will be in a vacuum and head pressure will be near normal.

If restriction is on high side, suction pressure will be in a vacuum and head pressure will be higher than normal during pump out cycle.

Refrigeration occurs on low pressure side of partial restriction. There will be a temperature difference at the point of restriction. Frost and/or condensation will be present in most case at the point of restriction. Also, system requires longer to equalize.

Slight or partial restriction can give the same symptoms as refrigerant shortage including lower than normal back pressure, head pressure, wattage, and warmer temperatures.

Total restriction on the discharge side of compressor, when restriction is between compressor and first half of condenser, results in higher than normal head pressure and wattage while low side is being pumped out.

Testing for Restrictions

To determine if a restriction exists:

1. Attach gauge and manifold between suction and discharge sides of sealed system.

2. Turn unit on and allow pressure on each side to stabilize. Inspect condenser side of system. T ubing on condenser should be warm and temperature should be equal throughout (no sudden drops at any point along tubing).

• If temperature of condenser tubing is consistent

throughout, go to step 4.

• If temperature of condenser tubing drops suddenly

at any point, tubing is restricted at point of temperature drop (if restriction is severe, frost may form at point of restriction and extend down in direction of refrigerant flow in system). Go to step 5.

3. Visually check system for kinks in refrigeration line which is causing restriction. Correct kink and repeat step 2.

4. Turn unit off and time how long it t akes high and low pressure gauges to equalize:

• If pressure equalization takes longer than 10

minutes, a restriction exists in the capillary tube or drier filter. Go to step 5.

• If pressure equalization takes less than 10 minutes,

system is not restricted. Check for other possible causes of malfunction.

5. Recover refrigerant in sealed system.

NOTE: Before opening any refrigeration system,

capture refrigerant in system for safe disposal.

6. Remove power from unit.

CAUTION

To avoid risk of personal injury or property damage, take necessary precautions against high temperatures required for brazing.

7. Remove and replace restricted device.

8. Evacuate sealed system.

9. Charge system to specification.

NOTE: Do not use captured or recycled refrigerant in

units. Captured or recycled refrigerant voids any compressor manufacturer's warranty .

NOTE: Charge system with exact amount of refrigerant.

Refer to unit nameplate for correct refrigerant charge. Inaccurately charged system will cause future problems.

Service Procedures

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. Discharge capacitor through a 10,000 ohm resistor before attempting to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational.

Evacuation and Charging

High S ide Gauge

Valve

Charging Hose

Drier/Process Tub

Valve

Charging

Cylinder

Low Side Gauge

Valve

CAUTION

To avoid risk of fire, sealed refrigeration system

Thermistor

Vacuum Gauge

must be air free. To avoid risk of air contamination, follow evacuation procedures exactly.

ompressor

NOTE: Before opening any refrigeration system, EPA

regulations require refrigerant in system to be captured for safe disposal.

Proper evacuation of sealed refrigeration system is an

Chargi ng Hose

Compressor Process Tube

.6 cm Copper

Tubing

important service procedure. Usable life and operational efficiency greatly depends upon how completely air, moisture and other non-condensables

Vacuum Pump

are evacuated from sealed system. Air in sealed system causes high condensing

temperature and pressure, resulting in increased

Equipment Setup For Evacuation And Charging power requirements and reduced performance. Moisture in sealed system chemically reacts with

refrigerant and oil to form corrosive hydrofluoric and hydrochloric acids. These acids attack motor windings and parts, causing premature breakdown.

Before opening system, evaporator coil must be at ambient temperature to minimize moisture infiltration into system.

Evacuation

To evacuate sealed refrigeration system:

1. Connect vacuum pump, vacuum tight manifold set

with high vacuum hoses, thermocouple vacuum gauge and charging cylinder as shown in illustration.

Evacuation should be done through I.D. opening of tubes not through line piercing valve.

2. Connect low side line to compressor process tube.

3. Connect high side line to drier/process tube.

4. Evacuate both simultaneously. With valve “C” and “F”

closed, open all other valves and start vacuum pump.

5. After compound gauge (low side) drops to approximately 29 inches gauge, open valve “C” to vacuum thermocouple gauge and take micron reading.

NOTE: A high vacuum pump can only produce a good

vacuum if oil in pump is not contaminated.

6. Continue evacuating system until vacuum gauge registers 600 microns.

7. At 600 microns, close valve “A” to vacuum pump and allow micron reading in system to balance. Micron level will rise.

• If in 2 minutes, micron level stabilizes at 1000

microns or below, system is ready to be charged.

• If micron level rises above 1000 microns and

stabilizes, open valve “A” and continue evacuating.

• If micron reading rises rapidly and does not

stabilize, a leak still exists in system. Close valve “A” to vacuum pump and valve “C” to

vacuum gauge. Invert charging cylinder and open charging cylinder valve “F” to add partial charge for leak checking. With leak detector, check manifold connections and system for leaks. Af ter locating leak, capture refrigerant, repair leak, and begin at step 1.

Service Procedures

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. Discharge capacitor through a 10,000 ohm resistor before attempting to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational.

Charging NOTE: Do not use captured or recycled refrigerant in

units. Captured or recycled refrigerant voids any warranty.

NOTE: Charge system with exact amount of refrigerant.

Refer to unit serial plate for correct refrigerant charge. Inaccurately charged system will cause future problems.

To charge system:

1. Close valves “A” to vacuum pump and “C” to vacuum gauge and “E” to low side manifold gauge.

2. Set scale on dial-a-charge cylinder for corresponding HFC134a pressure reading.

3. Open valve “F” to charging cylinder and let exact amount of refrigerant flow from cylinder into system. Close valve.

Low side gauge pressure should rise shortly after opening charging cylinder valve as system pressure equalizes through capillary tube.

If pressure does not equalize, a restriction typically exists at capillary/drier braze joint.

4. If pressure equalizes, open valve “E” to low side manifold gauge and pinch off high side drier process tube.

5. St art compressor and draw remaining refrigerant from charging hoses and manifold into compressor through compressor process tube.

6. To check high side pinch-off drier process tube. Close valve “D” to high side gauge. If high side pressure rises, repeat high side pinch-off and open valve “D”. Repeat until high side pinch-off does not leak.

7. Pinch-off compressor process tube and remove charging hose. Braze stub closed while compressor is operating.

8. Disconnect power. Remove charging hose and braze high side drier process tube closed.

9. Recheck for refrigerant leaks.

Refrigerant Charge

Refrigerant charge in all capillary tube systems is critical and exact amount is required for proper performance. Factory charges are shown on serial plate. NOTE: Do not use refrigerant other than shown on

serial plate.

Service Procedures

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. Discharge capacitor through a 10,000 ohm resistor before attempting to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational.

HFC134a Service Information

CAUTION

HFC134a is alternative refrigerant for CFC12. HFC134a has an ozone depletion potential (ODP) factor of 0.0 and a global warming potential (GWP)

To minimize contamination, exercise extreme care when servicing HFC134A sealed systems.

factor of 0.27. HFC134a is not flammable and has acceptable toxicity levels. HFC134a is not interchangeable with CFC12. There are significant differences between HFC134a and CFC12 which must be considered when handling and processing refrigeration system.

Health, Safety, and Handling

Health, safety and handling considerations for HFC134A are virtually no different than those for CFC12.

Health, Safety, and Handling

Allowable overall exposure limit Vapor exposure to skin No effect Same Liquid exposure to skin Can cause frostbite Same Vapor exposure to eye Very slight eye irritant Same Liquid exposure to eye Can cause frostbite Same Above minimum exposure limit

Safety and handling Wear appropriate skin

Spill management Remove or extinguish

Fire explosion hazards May decompose if

Disposal procedures Recycle or reclaim. Same

1,000 ppm Same

Can cause Asphyxiation, Tachycardia, and Cardia Arrhythmias

and eye protection. Use with adequate ventilation.

ignition or combustion sources. Evacuate or ventilate area.

contact with flames and heating elements. Container may explode if heated due to resulting pressure rise. Combustion products are toxic.

CFC12 HFC134a

Same

• No trace of other refrigerants is allowed in HFC134a systems. Chlorinated molecules in other refrigerants such as CFC12, etc. will lead to capillary tube plugging.

• Ester oil is used in HFC134a systems. Do not use mineral oil. HFC134a and mineral oils cannot be mixed. If mineral oils were used in HFC134a systems, lubricant would not return to compressor and would cause early compressor failure. If significant amount of oil has been lost from compressor, replace oil rather than adding oil.

• Ester oils used in HFC134a systems are so hydroscopic that by the time an inadequate system performance is detected, oil will be saturated with moisture.

• CFC12 has much higher tolerance to system processing materials, such as drawing compounds, rust inhibitors, and cleaning compounds, than HFC134a. Such materials are not soluble in HFC134a systems. If materials were to be washed from system surfaces by ester oils, they could accumulate and eventually plug capillary tube.

• Care must be taken to minimize moisture entering HFC134a system. Do not leave compressor or system open to atmosphere for more than 10 minutes. Excessive moisture in HFC134a system will react with compressor oil and generate acid.

• Compressor must be replaced when performing low side leak repair.

• Drier filter must always be replaced with service drier filter, part #B2150504.

Important: Unbrazing drier filter from tubing will drive

Comparison of CFC12 and HFC134a Properties

Properties/Characteristics CFC12 HFC134a

Ozone Depletion Potential (ODP) Global Warming Potential (GPW) Molecular weight 121 102 Boiling point at 1 atmospher e -22°F (-30°C) -15°F (-

Vapor pressure at 77°F (25°C) Liquid density at 77°F (25°C) 82 lb/ft Flammability No No High-side system operating Pressure at 65°F (18°C) Low-side system operating Pressure at 65°F (18°C)

1.0* 0.0*

3.2* 0.27*

80 psig 82 psig

HFC134a approximately 3 psig higher than CFC12 HFC134a approximately 2 psig lower than CFC12

126°C)

75 lb/ft

moisture from desiccant and into system, causing acids to form. Do not unbraze filter drier from tubing. If CFC12 service drier was installed in HFC134A system, drier could overload due to excessive moisture.

• HFC134a compatible copper tubing, part #R0174075 (1/4" O.D. X 18" length) and part #R0174076 (5/16" O.D. X 24" length) must be used when replacing tubing.

• Avoid system contamination by using Towerdraw E610 evaporating oil, part # R0157532, when flaring, swagging, or cutting refrigeration tubing.

Service Procedures

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. Discharge capacitor through a 10,000 ohm resistor before attempting to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational.

Replacement Service Compressor

HFC134a service compressors will be charged with ester oil and pressurized with dry nitrogen. Before replacement compressor is installed, pull out 1 rubber plug. A pop from pressure release should be heard. If a pop sound is not heard, do not use compressor. Positive pressure in compressor is vital to keep moisture out of ester oil. Do not leave compressor open to atmosphere for more than 10 minutes.

Compressor Testing Procedures

WARNING

To avoid death or severe personal injury, never use oxygen, air or acetylene for pressure testing or clean out of refrigeration system. Use of oxygen, air, or acetylene may result in violent explosion. Oxygen may explode on contact with oil and acetylene will spontaneously explode when under pressure.

Refer to Technical Data Sheet “Temperature Relationship Chart” for operating watts, test points, and temperature relationship test for unit being tested.

• Temperature testing is accomplished by using 3 lead thermocouple temperature tester in specific locations. Test point T-1 is outlet on evaporator coil and T-2 is inlet. Test point T-3 is suction tube temperature midway between where armaflex ends and suction port of compressor (approximately 12 inches from compressor).

• Thermocouple tips should be attached securely to specified locations.

• Do not test during initial pull down. Allow one off cycle or balanced temperature condition to occur before proceeding with testing.

• Refrigerator must operate minimum of 20 minutes after thermocouples are installed.

• Turn control to colder to obtain required on time.

• Wattage reading must be recorded in conjunction with temperature test to confirm proper operation.

• Suction and head pressures are listed on “Temperature and Relationship Chart”. Normally these are not required for diagnosis but used for confirmation on systems which have been opened.

Brazing

CAUTION

To avoid risk of personal injury or property damage, take necessary precautions against high temperatures required for brazing.

Satisfactory results require cleanliness, experience, and use of proper materials and equipment.

Connections to be brazed must be properly sized, free of rough edges, and clean.

Generally accepted brazing materials are:

• Copper to copper joints: SIL-FOS (alloy of 15 percent silver, 80 percent copper, and 5 percent phosphorous). Use without flux. Recommended brazing temperature is approximately 1400°F. Do not

use for copper to steel connection.

• Copper to steel joints: SILVER SOLDER (alloy of 30 percent silver, 38 percent copper, 32 percent zinc). Use with fluoride based flux. Recommended brazing temperature is approximately 1200°F.

• Steel to steel joints: SILVER SOLDER (see copper to steel joints).

• Brass to copper joints: SIL VER SOLDER (see copper to steel joints).

• Brass to steel joints: SILVER SOLDER (see copper to steel joints).

Refrigerant Flow

EVAPORATOR OUTLET

SUCTION LINE

CAPILLAR Y TUBE

LANG E L OO P

EVAPORATOR IN L E T

HIGH SIDE DRIER

EVAPORATOR

PROCESS TUBE

COMPRESSOR

PROCESS TUBE

CONDENSER

OMPRESSOR DISCHARGE LINE

22, 23, 26 cu. ft. Side by Side

Refrigerant Flow Diagram

Cabinet Air Flow

SIDE BY SIDE

FREEZER BACK

(AIR BAFFLE)

AIRFLOW DIAGRAM

REFRIGERATOR AIR

SUPPLY TO

FRESH FOOD

TUNNEL

COMPARTMENT

CONTROLS

EVAPORATOR

FAN ASSEMBLY

LARGE BEVERAGE CHILLER

AIR SUPPLY

(SO ME MODELS)

EVAPORATOR

MALL BEVERAGE CHILLER

AIR SUPPLY

(SO M E MO D E LS )

COMPRESSOR

AIR SUPPLY (IN F OAM)

REFRIGERATOR AI

RETURN TUNNEL

CONDENSER

ASSEMBLY

DELI

AIR

SUPPLY

22, 23, 26 cu. ft. Side by Side

Cabinet Air Flow Diagram

CONDENSER

Ice and Water Dispenser Diagram

I D

WATER FIL TER

WATER LINE IS ROUTED IN A CONDUIT

INLET

ICEMAKER

CE &WATER

ISPENSER

WATER FILTER OUTLET

WATER TANK

5/16” x 5/16” PUSH CONNECTOR UNION

UNDER THE FLOOR OF UNIT

DETAIL

22, 23, 26 cu. ft. Model Side by Side

Ice and Water Flow Diagram

Water Valve Diagram

W I

INLET 1/4”

WATER SUPPLY

WATER FILTER

SOLENOID VALVE

OUTLET

HOOKUP

ATER TANK

NLET 5/16”

INLET

DETAIL

ICE MAKER

22, 23, 26 cu. ft. Model Side by Side

Ice and Water Flow Diagram

Typical External Sweat Pattern

Classifi cation of condensation: 1 = Haze or Fog

2 = Beading 3 = Beads or Small D r ops 4 = Drops Running Together

BTM

Troubleshooting Chart

WARNING

Troubleshooting chart on following pages contains symptoms that may be seen in malfunctioning units. Each symptom is accompanied by one or more possible causes and by a possible remedy or test to determine if components are working properly.

Symptom Possible Causes Corrective Action

Unit does not run

No power to unit Check for power at outlet. Check

fuse box/circuit breaker for blown fuse or tripped breaker. Replace or reset.

Faulty power cord Check with test light at unit; if no

circuit and current is indicated at outlet, replace or repair.

Low voltage Check input voltage for proper

voltage. Take appropriate action to correct voltage supply problem.

Refrigerator section too warm

Faulty motor or freezer temperature control

Faulty timer Check with test light. Replace if

Faulty relay Check relay. Replace if necessary. Faulty compressor Check compressor motor windings

Faulty overload Check overload for continuity.

Excessive door opening Consumer education Overloading of shelves Consumer education

Warm or hot foods placed in cabinet Consumer education Cold control set too warm Set control to colder setting. Poor door seal Level cabinet. Adjust hinges.

Refrigerator airflow Check damper is opening by

Interior light remains on Check switch. Replace if necessary. Faulty condense r fan or ev apo r a to r

fan Faulty compressor Replace compressor.

Check all connections are tight and secure.

Jumper across terminals of control. I unit runs, replace control.

necessary.

for opens/shorts. Perform compressor direct wiring

test. Replace if necessary.

NOTE: Ensure compressor/overload are below trip temperature before testing.

Replace if necessary.

Replace gasket.

removing grille. With door open, damper should open. Replace if faulty.

Turn control knob to colder position.

Check fan and wiring. Replace if necessary.

Troubleshooting Chart

WARNING

Symptom Possible Cau ses Corrective Action

Refrigerator section too cold

Freezer and refrigerator sections too warm

Freezer section too cold

Unit runs continuously

Unit runs continuously. Temperature normal. Unit runs continuously. Temperature too cold. Noisy operation

Refrigerator temperature control set too cold

Refrigerator airflow not properly adjusted Temperature controls set too warm Reset temperature controls.

Poor door seal Level cabinet. Adjust hinges.

Dirty c o n dens e r o r o b s tr u c te d g rille Ch ec k condenser and grille. Clean. Faulty control Test control. Replace if failed. Refrigerant shortage or restriction Check for leak or restriction. Repair,

Freezer temp control set too cold Adjust freezer temperature control. Faulty control Test control. Replace if failed. Cold control capillary not properly

clamped to evaporator Temperature control set too cold Adjust temperature control.

Dirty c o n dens e r o r o b s tr u c te d g rille Ch ec k condenser and grille. Clean. Poor door seal Level cabinet. Adjust hinges.

Interior light remains on Check switch. Replace if necessary. Faulty condenser fan or evaporator

fan Faulty control Test control. Replace if failed.

Refrigerant shortage or restriction Check for leak or restriction. Repair,

Refrigerant overcharge Check for overcharge. Evacuate and

Air in system Check for low side leak. Repair,

Ice on evaporator See “Ice on evaporator”. Faulty defrost thermostat Check thermostat. Replace if Loose flooring or floor not firm Repair floor or brace floor.

Cabinet not level Level cabinet. Tubing in contact with cabinet, other

tubing, or other metal Drip pan vibrating Adjust drain pan. Fan hitting another part Ensure fan properly aligned and all

Worn fan motor bearings Check motor for loss of lubricant or

Compressor mounting grommets worn or missing. Mounting hardware loose or missing Free or loose parts causing or allowing noise during operation

Adjust refrigerator temperature control.

Check air flow.

Replace gasket.

evacuate and recharge system.

Reposition clamp and tighten.

Replace gasket.

Check fan and wiring. Replace if necessary.

evacuate and recharge system.

recharge system.

evacuate and recharge system.

necessary.

Adjust tubin g.

attaching hardware and brackets are tight and not worn. Tighten or replace.

worn bearings. Replace if necessary Tighten hardware. Replace

grommets if necessary. Inspect un it for parts that may h a ve

worked free or loose or missing screws. Repair as required.

Troubleshooting Chart

WARNING

Symptom Possible Causes Corrective Action

Frost or ice on evaporator

Unit starts and stops frequently (cycles on and off)

Defrost thermostat faulty Check defrost thermostat. Replace if

failed.

Evaporator fan faulty Check fan motor. Replace if failed. Defrost heater remains open Check defrost heater continuity.

Replace if failed. Defrost control faulty Check control and replace if failed. Open wire or connector Check wiring and connections.

Repair as necessary. Refrigerant shortage or restriction Check for leak or restriction. Repair,

evacuate and recharge system. Loose wire or thermostat

connections Supply voltage out of specification Check input voltage. Correct any

Overload protector open Check overload protector for

Faulty compressor motor capacitor (some compressors do not require

motor capacitor)

Check wiring and connections.

Repair as necessary.

supply problems.

continuity. If open, replace overload.

NOTE: Ensure overload/compressor are below trip temperature before testing.

Check capacitor for open/short.

Replace if necessary.

NOTE: Discharge capacitor before testing.

Faulty fan motor Check fan motor. Replace if failed. Restricted air flow Check condenser and grille for dirt.

Clean. Refrigerant shortage or restriction Check for leak or restriction. Repair,

evacuate and recharge system.

System Diagnosis

CONDITION

Refrigerant

Overcharge

Shortage of

Refrigerant

Partial

Restriction

Air in

System

Low Ambient

Installations

(High

Ambients the

Reverse)

Additional

Heat Load

SUCTION

PRESSURE

VARIATION

FROM

NORMAL

Increase Increase Warmer Warmer Colder Increase

Decrease

Near Normal Increase Warmer Warmer Warmer Increase

Decrease Decrease Colder Warmer Warmer Decrease

Increase Increase Warmer Warmer Warmer I ncreas e

HEAD PRESSURE VARIATION

FROM

NORMAL

Decrease or

Increase

See Text

Decrease or

Increase

See Text

Note 2

T1 INLET

TEMPERATURE

VARIATION

FROM NORMAL

Colder Warmer Warmer Decrease

T2 OUTLET

TEMPERATURE

VARIATION

FROM NORMAL

T3 SUCTION

TEMPERATURE

VARIATION

FROM NORMAL

WATTAGE

VARIATION

FROM

NORMAL

Inefficient

Compressor

Increase

Normal or Decrease

Warmer or

Colder

Symptoms of an Overcharge

• Above normal freezer temperatures.

• Longer than normal or continuous run.

• Freezing in refrigerator, especially on forced air meatkeeper models.

• Higher than normal suction and head pressure.

• Higher than normal wattage.

• Evaporator inlet and outlet temperatures warmer than normal.

• Suction tube temperature below ambient. Always check for separated heat exchanger when suction temperature is colder than ambient.

V arious conditons could indicate an overcharge. For example, if the cooling coil is not defrosted at regular intervals, due to a failure of the defrost system, the refrigerant will "flood out" and cause the suction line to frost or sweat. The cause of this problem should be corrected rather than to purge refrigerant from the sytem. Running the freezer section colder than necessary (-2 to -1 F. is considered normal package temperatures) or continuous running of the compressor for a variety of reasons, or the freezer fan motor not running, may give the indication of an overcharge.

Warmer Warmer Decrease

Symptoms of Refrigeration Shortage

• Rise in food product temperature in both compartments. (See Note 1 below .)

• Long or continuous run time.

• Look for obvious traces of oil that would occur due to a leak or cracked refrigerant line.

• Lower than normal wattage.

• Compressor will be hot to touch because of the heat generated by the motor windings from long continuous running. It will not be as hot as it would be with a full charge and long run times for some other reason such as a dirty condenser.

• Depending on the amount of the shortage, the condenser will not be hot, but closer to room temperature. The capillary tube will be warmer than normal from a slight shortage.

• If the leak is on the high side of the system, both gauges will show lower than normal readings and will show progressively lower readings as this charge becomes less. The suction pressure guage will probably indicate a vacuum.

• If the leak is on the low side of the system the suction pressure guage will be lower than normal - probably in a vacuum - and the head pressure gauge will be higher than normal. It will probably continue to become higher because air drawn in through the leak is compressed by the compressor and accumulates in

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