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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.
Bunker
Freezers
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:
CH-68
CH-90
CH-105
CH-125
CH-150
CH-170
CHP-68
CHP-90
CHP-105
CHP-125
CHP-150
CHP-170
16025738
March 2005
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Summary of Contents for Maytag Amana CH-68
- Page 1 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. This Base Manual covers general information Bunker...
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Page 2: 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. -
Page 3: Table Of Contents
Leak Testing ............13 Evacuation and Charging ........13 Dehydrating Sealed Refrigeration System ....15 Brazing ..............15 Refrigerant Precautions .......... 15 Using Line Piercing Valves ........15 Open Lines ............15 Component Testing Compressor ............16 16025738 ©2005 Maytag Services... -
Page 4: Safety Information
"just a few days". When you get rid of your old freezer, please follow the instructions below to help prevent accidents. Before Throwing Away Old Freezers: • Take off the doors. • Leave the shelves in place to prevent children from easily climbing inside unit. 16025738 ©2005 Maytag Services... -
Page 5: General Information
P – Slanted top 125 – 49 " or 125 cm Blank – Flat top 150 – 59" or 150 cm 170 – 66" or 170 cm T – Thermoplastic cabinet frame Blank – Aluminum cabinet frame 16025738 ©2005 Maytag Services... -
Page 6: Unpacking
(-20°C) since freezer is designed to maintain a frozen product at 0°F (-18°C) at load level. Freezer is not designed to re-freeze a warm food product. 8. Assure keeping the lids closed to avoid warm air and moisture from entering the freezer cavity. 16025738 ©2005 Maytag Services... -
Page 7: Service Information
Room temperature exceeds recommended maximum. c. Cabinet is placed near radiator or other heat source, such as strong sunlight. d. Temperature control is incorrectly adjusted or has failed. e. Refrigerant charge is low f. Freeze-up 16025738 ©2005 Maytag Services... -
Page 8: Refrigerant Leaks
(This can be confused with a faulty thermostat.) 3. Although compressor is running continuously, food- liner temperature will rise. 4. Low suction pressures. 16025738 ©2005 Maytag Services... - Page 9 200–300 psi. • no leak. Condenser or Evaporator Leak (Internal) If indications are that internal leak is in condenser, leak is considered to be nonrepairable. If unit is under warranty, contact factory for permission to replace unit. 16025738 ©2005 Maytag Services...
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Page 10: Evacuation And Charging Procedures
• Clean, dry HFC134a compatible copper tubing must be used when replacing tubing. • Avoid system contamination by using evaporating oil, when flaring, swaging, or cutting refrigeration tubing. 16025738 ©2005 Maytag Services... -
Page 11: Hfc134A Service Information
Container may explode if heated due to resulting pressure rise. Combustion products are toxic. Storage conditions Procedures/rules for Same CFC12 also apply for HFC134a. Disposal procedures Recycle or reclaim Same 16025738 ©2005 Maytag Services... -
Page 12: Service Equipment
• Dry nitrogen 99.5% minimum purity, with -40°C (-40°F) or lower dew point • Crimp tool • Tube bender • Micron vacuum gauge • * Process tube adaptor kit • Heat trap paste • * Appliance grade HFC134a 16025738 ©2005 Maytag Services... -
Page 13: Replacement Hfc134A Service Compressor
12.Visually check all joints for leaks. Evacuate and recharge the system. 13.Reconnect wire leads to compressor terminals and test unit to make sure it is operating properly. 14.Pinch the process tube and cut off service valve. Braze joint and test for leaks. 16025738 ©2005 Maytag Services... - Page 14 1000 microns or below, system is ready for charging. closed. • If micron rises above 1000 micron level and stabilizes, open valve “A” to vacuum pump and continue evacuating. 16025738 ©2005 Maytag Services...
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Page 15: Dehydrating Sealed Refrigeration System
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. 16025738 ©2005 Maytag Services... -
Page 16: Component Testing
Check windings by placing one probe of ohmmeter on common terminal and one of starting terminals. b. Place probes on common terminal and on run terminal. 7. Continue check by placing one probe on a motor terminal and one on the housing. If lamp lights, unit is grounded. 16025738 ©2005 Maytag Services... - Page 17 Ensure all ground wires are connected before certifying unit as repaired and/or operational. Compressor Base Discharge (STL) Feeler Bulb Process Stub (Copper) Suction Line (Copper) Condenser Inlet Heat Exchange Condenser Outlet Condenser Outlet Condenser Inlet High Side Process Heat Exchange Low Side Process (Suction) Drier Compressor 16025738 ©2005 Maytag Services...
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Page 18: Component Specifications
142ºF / 61ºC Open temperature......239ºF / 115ºC 221ºF / 105ºC 221ºF / 105ºC Embraco Short time trip (seconds)....5-15 5-15 5-15 Short time trip (amps @77°F (25°C) .. 14 A 23 A 26.5 A 16025738 © 2005 Maytag Services... - Page 19 142°F / 61°C Open temperature......239°F / 115°C 221°F / 105°C 221°F / 105°C Embraco Short time trip (seconds)....5-15 5-15 5-15 Short time trip (amps @77°F (25°C) .. 14 A 23 A 26.5 A 16025738 © 2005 Maytag Services...
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Page 20: Disassembly Procedures
8. Replace failed component and reverse procedure to 5. Remove screw securing ground wire to unit chassis. reassemble. 6. Remove power cord grommet from back panel (some models). 7. Remove power cord back panel. 8. Reverse procedures to reassemble. 16025738 ©2005 Maytag Services... -
Page 21: Power Cord
3. Remove roller pins from cabinet bracket. NOTE: Take care to securing canopy, to prevent canopy from falling. 4. Remove bolts, lock washers, and washers securing cabinet bracket to freezer chassis. 5. Replace component and reverse procedure to reassemble. 16025738 ©2005 Maytag Services...
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