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TABLE 3 – REFRIGERATION SYSTEM SERVICE AND ANALYSIS CHART 

REFRIGERATION  SYSTEM 

MALFUNCTION

 

POSSIBLE CAUSE

 

SOLUTION

 

1. Line cord not plugged in. 

1. Plug in the cord. 

2. Fuse removed or blown. 

2. Replace fuse. 

3. Overload protector tripped. 

3. Refer to electrical section. 

4. Temp control stuck in open position. 

4. Repair or replace temp control. 

Compressor will not start 

- no hum - 

5. Wiring improper or loose. 

5. Check wiring against diagram. 

1. Low voltage to unit. 

1. Determine reason and correct. 

2. Relay failing to close 

2. Determine reason and correct,  replace if 

necessary. 

3. Starting capacitor defective. 

3. Determine reason and replace. 

Compressor will not start 

- hums but trips on overload 

protector. 

4. Improperly wired. 

4. Check wiring against diagram. 

1. Low voltage to unit. 

1. Determine reason and correct. 

2. Relay failing to open. 

2. Determine reason and correct, replace if 

necessary. 

3. Run capacitor defective. 

3. Determine reason and replace. 

Compressor starts but does not 

switch off of start winding. 

4. Compressor mounting winding is open or 

shorted. 

4. Determine cause, correct, and replace 

compressor. 

1. Additional current passing through overload 

protector. 

1. Check wiring diagram. Check for added fan 

motors, pumps, etc. connected to wrong side of 
protector. 

2. Low voltage to unit. 

2. Determine reason and correct. 

3. Overload protector defective. 

3. Check current, replace protector. 

4. Run capacitor defective. 

4. Determine reason and replace. 

5. Excessive discharge pressure. 

5. Check ventilation, restrictions in cooling medium, 

restrictions in refrigeration system. 

Compressor starts and 

runs, but short cycles on 

overload protector. 

6. Compressor too hot - return gas hot. 

6. Check refrigerant charge (fix leak if necessary). 

Check airflow across condenser. 

1. Overload protector. 

1. Check wiring diagram for correct wiring. 

2. Cold control. 

2. Differential set too close. 

3. Overcharge. 

3. Reduce refrigerant charge. 

4. Air in system. 

4. Recover and recharge. 

Unit runs OK, but short 

cycles. 

5. Undercharge. 

5. Fix leak and recharge with refrigerant. 

1. Dirty condenser. 

1. Clean condenser. 

2. Shortage of refrigerant. 

2. Fix leak, add charge, correct charge. 

3. Temperature control contacts stuck or frozen. 

3. Replace temperature control. 

4. Evaporator coil iced. 

4. Defrost. 

Unit operates long or 

continuously. 

5. Restriction in refrigeration system. 

5. Determine location and remove. 

1. Relay contacts not opening properly. 

1. Replace relay. 

2. Low voltage to unit. 

2. Determine reason and correct. 

Start capacitor open, shorted or 

blown. 

3. Improper relay. 

3. Replace. 

1. Improper capacitor.   

1. Determine correct size and replace. 

Run capacitor open, shorted 

or blown 

2. Excessively high line voltage (110% of rated 

max). 

2. Determine reason and correct. 

1. Incorrect relay. 

1. Check and replace. 

2. Line voltage too high or too low. 

2. Determine reason and replace. 

Relay defective or burned out 

3. Relay being influenced by loose vibrating 

mounting. 

3. Remount rigidly. 

1. Control setting too high. 

1. Reset control. 

2. Overcharged with refrigerant. 

2. Recover refrigerant and recharge with proper 

charge specified on data plate. 

Space temperature too high 

3. Inadequate air circulation. 

3. Improve air movement. 

Cooler freezing beverage 

1. Temperature control 

1. Reset control. 

1. Loose parts or mountings. 

1. Find and tighten. 

2. Tubing rattles. 

2. Reform to be free of contact. 

3. Bent fan blade causing vibration.  

3. Replace blade. 

Unit noisy 

4. Fan motor bearings worn. 

4. Replace motor. 

 

 

 

Summary of Contents for Miracool

Page 1: ...cations or designs without notice and without incurring obligations Printed in Mexico 10 06 79BC560010 01_C OWNER S MANUAL MIRACOOL GLASS DOOR MERCHANDISER 2000L Sales Office P O Box 5932 Spartanburg S C 29304 5932 Technical Service 1 800 558 7627 Parts Order Fax 1 800 262 9381 ...

Page 2: ...sories and components including legs casters and shelves File a claim immediately with the shipping company if shipment is damaged or incomplete INSTALLATION LOCATE UNIT Refer to Figure 1 for unit components Units are designed for indoor placement only Provide at least 3 inches of space between unit cabinet and any adjacent wall or fixture Remove skid base by removing the retaining screws 8 hex he...

Page 3: ...3 FIGURE 1 MIRACOOL BOTTLE COOLER UNIT COMPONENTS MC2000H SHOWN ...

Page 4: ... U DANGER Before servicing unit disconnect electrical service Failure to disconnect electrical service could result in electrical shock and cause personal injury or death Swing Doors The door is equipped with gravity assisted cams and will not function properly without proper leveling of cabinet Adjust feet using adjustable wrench so that unit sits approximately level to floor and doors close prop...

Page 5: ... shelf clips Refer to the numbers on the pilaster to ensure that all clips are properly located 2 Insert top tab of the shelf clip into the desired hole of the pilaster The retaining tab should be facing upward as shown in Figure 4 3 Rotate the clip downward and insert the bottom tab into the appropriate hole on the pilaster If necessary squeeze the clip slightly during installation 4 Install all ...

Page 6: ...THOUT SAFETY SHIELD FIGURE 7 CHECK INSTALLATION OF LAMP WITH SHIELD ELECTRICAL SUPPLY AND CONNECTIONS Check to be sure that the electrical service to the unit meets all local and national electrical codes Unit electrical data is shown in the unit data label located on the inside of the cabinet in the upper lefthand corner Review this label before initiating electrical service Voltage range of powe...

Page 7: ...g TEMPERATURE CONTROL The temperature control knob is located inside the cabinet in the motors panel See Figure 8 Unit is factory set at the number 4 position normal which will maintain the product at approximately 38F For colder temperature turn the black adjustment knob to a higher setting Adjust temperature control in small increments one position at a time U CAUTION Allow 24 hours between temp...

Page 8: ...ER Liquid refrigerant control to the evaporator of the system is accomplished by the use of a capillary tube This capillary tube is soldered to the suction line to form a heat exchanger which subcools the liquid refrigerant to maintain high efficiency within the system SERVICE AND TROUBLESHOOTING CONDENSING UNIT SERVICING U DANGER Before servicing unit disconnect electrical service Failure to disc...

Page 9: ...ne with refrigerants to form an acid The corrosive action of this acid forms sludge which will plug the lines and drier Since most field type vacuum pumps cannot pull a low enough vacuum to remove all moisture from the system it is recommended that the system be triple evacuated breaking each time with dry refrigerant nitrogen Use care to purge air from the charging hose when breaking the vacuum C...

Page 10: ... overload protector 6 Compressor too hot return gas hot 6 Check refrigerant charge fix leak if necessary Check airflow across condenser 1 Overload protector 1 Check wiring diagram for correct wiring 2 Cold control 2 Differential set too close 3 Overcharge 3 Reduce refrigerant charge 4 Air in system 4 Recover and recharge Unit runs OK but short cycles 5 Undercharge 5 Fix leak and recharge with refr...

Page 11: ...11 FIGURE 12 WIRING DIAGRAM ...

Page 12: ...t Servicing section on page 8 Vacuum clean front surface of coil thoroughly or direct forced air through condenser fins Failure to clean condenser can cause compressor malfunction and will void warranty CABINET EXTERIOR Cabinets should be cleaned with a solution of mild soap and water or mild household cleaner Do not use caustic soap or abrasive cleaners since these might damage the cabinet finish...

Page 13: ...e Fatty Acids Milkstone where swabbing or rubbing is not practical Easy Off oven cleaner Apply generous coating Allow to stand for 10 to 15 minutes Rinse Repeated application may be necessary Excellent removal Satisfactory for use on all finishes Hard Water Spots and Scale Vinegar Swab or wipe with cloth Rinse with water and dry Satisfactory for use on all finishes Use of brand names is intended o...

Page 14: ...urer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Printed in Mexico 10 06 79BC560010 01_C Copyright 2006 Carrier Corporation ...

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