Maytag AFU1202BW Operating instructions

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
Refer to individual Technical Sheet
for information on specific models
This manual includes, but is
not limited to the following:
Upright
Freezers
Amana
AFU1202BW
AFU1505BW
AFU1567BW
AFU1705BW
AFU1767BW
AFU2005BW
AFU2067BW
AQU1525AEW
Maytag
MQU1554AEW
MQU1556AEW
MQU2056ARW
MQU2057AEW
16023585
September 2004
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 RESPONSIBLITY 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.
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©2004 Maytag Services
Table of Contents
Important Information ................................................... 2
Model Identification .................................................... 4
Installation Instructions
Unpacking ................................................................ 5
General .................................................................... 5
Location ................................................................... 5
Electrical Connection ............................................... 5
Door Handle ............................................................. 6
Leveling .................................................................... 6
Test After Installation ................................................ 6
General Instructions
Electrical Requirements ........................................... 7
Proper Disposal of your Freezer ............................... 7
Model Identification .................................................. 7
Operating Instructions
Setting Controls ....................................................... 8
Temperature Control ................................................. 8
Features .................................................................. 9
Reversible Rack (some models) ............................... 9
Freezing Guide ........................................................ 9
Care and Cleaning
General .................................................................. 10
Adhesives .............................................................. 10
Door Gaskets ........................................................ 10
Odor Removal ........................................................ 10
Defrosting .............................................................. 11
Light Bulb (some models) ...................................... 11
General Tips
Energy Tips ........................................................... 12
Vacation Tips ......................................................... 12
Normal Operating Sounds ...................................... 12
Before Calling For Service ...................................... 12
Operating Sounds .................................................. 13
Component Testing
Refrigeration System Test Procedures ................... 14
Testing Main Condenser ......................................... 15
Testing for Leaks .................................................... 16
Electrical System .................................................. 16
Compressor Electrical Tests .................................. 16
Testing Compressor Direct ..................................... 16
Capacitor ............................................................... 17
Overload Protector ................................................. 17
Testing Overload Protector ..................................... 17
PTC Relay ............................................................. 18
Testing PTC Relay ................................................. 18
Interior Light and Switch ......................................... 18
Checking Control Operation ................................... 18
Temperature Control ............................................... 19
Defrost Timer ......................................................... 19
Checking Timer ...................................................... 20
Defrost Heater and Thermostat
No-Defrosting Models ............................................. 20
Freezer Fan No-Defrosting Models ......................... 21
Testing Freezer Fan Motor ..................................... 21
Performance Data .................................................. 22
Troubleshooting .................................................... 23-25
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Disassembly Procedures
Replacing Drier ...................................................... 26
Replacing Compressor ........................................... 26
Replacing Heat Exchanger
Refrigerated Shelf Model ........................................ 27
Replacing Heat Exchanger
No-Defrosting Models ............................................. 28
Replacing Freezer Shelving
Refrigerated Shelf Models ...................................... 29
Replacing Freezer Coil No-Defrosting Models ......... 30
Replacing Light Switch ........................................... 31
Replacing Control ................................................... 31
Replacing Heater ................................................... 32
Replacing Freezer Fan Motor ................................. 32
Cabinet Door Assembly ......................................... 33
Door Handle ........................................................... 34
Door Lock Assembly .............................................. 34
Removing Door Lock Assembly .............................. 35
Cabinet Door Alignment ......................................... 35
Checking Gasket Seal ........................................... 35
Improving Gasket Seal ........................................... 35
Hinge Adjustments ................................................. 35
Cabinet Assembly .................................................. 36
Service Information
System Operation .................................................. 37
Checking Operating Pressures ............................... 38
Operational Testing ................................................ 39
Service Hints .......................................................... 39
Refrigeration System Complaints ........................... 40
Refrigerant Leaks ................................................... 41
Evacuation and Charging Procedures ..................... 42
HFC134a Service Information ................................. 43
Health, Safety, and Handling .................................. 43
Service Equipment ................................................. 44
Drier Replacement ................................................. 44
Replacement HFC134a Service Compressor .......... 45
Refrigerant Charge ................................................. 45
Leak Testing .......................................................... 45
Evacuation and Charging ........................................ 45
Dehydrating Sealed Refrigeration System .............. 47
Brazing .................................................................. 47
Refrigerant Precautions .......................................... 47
Open Lines ............................................................ 47
Line Piercing Valves ............................................... 48
Altitude Adjustment ................................................ 48
Cabinet Shell ......................................................... 49
Cabinet Liner (Food) ............................................... 49
Drain System ......................................................... 49
Wiring Diagram and Schematic ............................ 50-51
3
Model Identification
Upright freezer models vary in trim and accessories,
but all models have the same basic construction.
"Operating Instructions" and "Service Instructions"
apply to all cabinets unless stated otherwise.
For positive identifications of individual units, state
complete serial number, model, and type. This
information is found on the serial plate located on front
upper right hand corner of foodliner or on some
models, exterior back of the outer casing.
An explanation of coding contained in Type position is
shown below.
Amana & Maytag Model Identification
A
F
U
1 2
0
2
B
W
Color
W ⎯ White
Feature Package
1 ⎯ 3 ⎯ Good
4 ⎯ 6 ⎯ Better
7 ⎯ Best
Special Features
0 ⎯ No Auto Defrost
6 ⎯ Auto Defrost
Capacity
12 ⎯
15 ⎯
17 ⎯
20 ⎯
Cubic
Cubic
Cubic
Cubic
Foot
Foot
Foot
Foot
Configuration
C ⎯ Chest Freezer
U ⎯ Upright Freezer
Product
F ⎯ Freezer
Amana
Maytag
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Installation Instructions
Unpacking
Location
Remove all protective packaging. Cardboard shipping
braces and/or protective tape used to prevent damage to
baskets, shelves, speciality racks, and compartment
dividers during shipment. Use soapy water to remove
any adhesive residue. Do not use alcohol or nail polish
remover.
Door/Lid, handles, and hinges:
• Support and secure door lid before transporting or
moving the freezer.
• Install freezer handle if applicable
• Do not use door or handle for leverage to lift or push
unit.
Defrost drain plug and drain pan:
• Verify drain plug is installed on non-frost-free
freezers
• Before operating frost-free freezer verify frost drain
pan is installed behind toe grille located at bottom
front of freezer with drain hose placed in the pan.
Toe grille:
• Toe grille at bottom front of freezer can be removed
to locate drain tube and levelling gliders.
• Remove toe grille by grasping both ends and pulling
straight outward. Replace by pressing ends of toe
grille into slots on cabinet and snapping into place.
These recommendations and explanations may help
customer receive maximum efficiency from freezer and
avoid service calls.
!
CAUTION
To avoid personal injury, wear gloves when installing
freezer.
To avoid property damage, protect soft vinyl or other
flooring with cardboard, rugs or other protective
material during installation or servicing.
If freezer is to be placed in basement, back porch, etc.,
place freezer on wooden slats up off floor.
1. Freezer is designed for installation as a
"freestanding" (not "built-in") unit.
2. Locate freezer with at least 3 inches of clearance on
both ends and back to provide adequate air
circulation to dissipate condenser heat.
3. Avoid locations near stoves, radiators, hot air ducts,
or where sun may cause excessive heat.
4. Do not locate where surrounding temperature could
drop below 32°F (0°C). Temperatures below 32°F
(0°C) cause compressor oil to thicken delaying
lubrication of sensitive components at compressor
start-up.
5. Avoid placing freezer on plush carpet which may
retard air flow over bottom, causing bottom sweating.
Electrical Connection
1. Electrical supply should be checked for proper
voltage and ground.
! WARNING
Toe grille
Do not, under any circumstances, cut or remove the
round grounding prong from the plug. Freezer must
be grounded at all times. Do not remove warning tag
from power cord.
General
• Secure door before moving freezer. Do not use door
or handle to lift or push freezer. If hinges must be
removed, check instruction label on rear of freezer
cabinet.
• Freezers are currently rated for domestic use, not
designed for commercial application.
• Confirm the following items are installed.
Free-O-Frost™ Upright Freezer Models
Defrost drain pan behind toe grille.
Standard Upright Freezer Models
Drain plug in bottom front of freezer liner.
(some models)
©2004 Maytag Services
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2. Avoid extension cords. If absolutely necessary, use
an Appliance Extension cord (at least
16 AWG) of less than 10 feet. If possible, have
freezer on separate circuit.
5
Installation Instructions
Door Handle
Leveling
1. If handle trim has not been factory installed,
slide right edge of handle trim under right edge
of trim retainer. Verify rib on right inside edge of
handle trim fits into trim retainer notch. Snap outside
edge of handle trim over outside edge of trim
retainer.
2. Install handle on freezer door as shown. Verify
freezer handle is angled inward towards opposite
side of freezer. Secure handle to freezer door with
screws provided. Verify screws are secure.
3. Slide end caps over ends of handle until end
caps snap in place. End cap marked L goes on
top end of handle. End cap marked R goes on
bottom end of handle.
1. Install leveling legs under front corners behind toe
grille.
2. Level freezer side to side and tilt freezer 1/4" from
front to back. Turn legs clockwise to raise freezer and
counterclockwise to lower freezer. If freezer cannot
be level due to flooring, use shims under rear of
freezer cabinet to level freezer.
End
caps
Handle
Leveling
foot
Trim
retainer
Trim retainer
notch
Handle trim
3. Check freezer 2 or 3 weeks after loading with food
and confirm freezer is level.
Test After Installation
1. For proper compressor operation, voltage must be
measured at the compressor terminals at the
moment of starting. Voltage must be in the range
shown on Freezer Wiring Diagram.
2. Check freezer is reasonably level.
3. Check lid gasket seal.
4. Be sure light(s) work.
5. Check lock.
6. Wipe off any dirt and smudges.
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General Instructions
Electrical Requirements
Model Identification
Electrical Grounding Instructions—This freezer is
equipped with a three-prong (grounding) plug for
protection against possible shock hazards. If a twoprong wall receptacle is encountered, contact a
qualified electrician and have the two-prong wall
receptacle replaced with a properly grounded
three-prong wall receptacle in accordance with the
National Electrical Code.
Freezers are designed to operate on a separate
103 to 126 VAC, @ 15 A., with a 60 Hz cycle.
Read the Owner's Manual thoroughly. This manual
provides proper maintenance information for consumers.
Any questions, call the Customer Service Support Center
Complete enclosed registration card provided in
owners manual and promptly return. If registration card is
missing, call the Customer Service Support Center.
When contacting Customer Service Support Center
provide product information. Locate product information
on the serial plate. Record the following information:
Do not under any circumstances cut or remove the
round grounding prong from the plug. Freezers must
be grounded at all times. Do not remove warning tag
from power cord.
Model Number:
Do not use a two-prong adapter. Do not use an
extension cord.
Date of purchase:
Manufacturing Number:
S/N or Serial Number:
Dealer’s name and address:
Proper Disposal of your Freezer
Keep a copy of sales receipt for future reference.
NOTE: Child entrapment and suffocation are not
problems of the past. Junked or abandoned
freezers are still dangerous—even if they sit for
"just a few days". When you get rid of your old
freezer, please follow the instructions below to
help prevent accidents.
Locate an authorized servicer by calling
1-800-NATLSVC (628-5782) inside U.S.A. Warranty
service must be performed by an authorized servicer.
Maytag also recommends contacting an authorized
servicer if service is required after warranty expires.
Before Throwing Away Old Freezers:
• Take off the doors.
• Leave the shelves in place to prevent children from
easily climbing inside unit.
©2004 Maytag Services
16023585
7
Operating Instructions
Setting Controls
This freezer operates most efficiently in normal
household temperatures of 65° to 90°F.
OFF
W
AR 1
ME
ST
CO 7
LD
ES
T
6
2
Temperature Control
5
3
4
7
1
When control is set to OFF, freezer will not cool. Initially,
set control to 4. Wait 3 hours after connecting power for
freezer to reach desired temperatures, then add food.
After 24 hours, adjust control as desired. 1 is warmest
setting and 7 is coldest.
Locate temperature control on right side of interior
freezer cabinet wall.
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Set temperatures precisely using a household
thermometer that includes temperatures between -5° to
50°F. Put thermometer snugly between frozen packages
in freezer. Wait 5–8 hours. If freezer temperature is not
0° to 2°F, adjust control, one number at a time. Check
again after 5–8 hours.
©2004 Maytag Services
Operating Instructions
Features
Freezing Guide
Door Lock
Lock freezer door by completing the following:
Wrapping
• Use moisture-vapor-proof materials and seal tightly.
When lids are furnished, follow manufacturer's
directions for best results.
1. Insert key into lock approximately 1/4".
2. Turn key clockwise to lock door and counterclockwise
to unlock door.
!
WARNING
To help prevent child entrapment keep key out of
reach of children and away from cabinet.
• Choose materials which are labeled for freezer use.
Ordinary waxed paper or butcher paper does not
provide proper protection for frozen food. Materials not
designed for freezer use may give off odors.
Freezing Guidelines
Item
Reversible Rack (some models)
Racks separates food for more storage space.
Remove rack by releasing rack from shelf wires. Pull
down if located under shelf or lift up if located above
shelf.
Replace rack by positioning on top or underneath shelf
wires. Slide rack until rack locks in place.
©2004 Maytag Services
16023585
Meat
Beef roast or steak
(fresh)
Meat casserole
(cooked)
Hamburger
Pork (cured)
Pork chop or roast
(fresh)
Roast (fresh)
Sausage
Veal
Lamb
Poultry
Chicken (fresh)
Chicken (cooked)
Duck
Goose
Turkey (fresh)
Turkey (cooked)
Fish
Vegetables
Fruits
Bread and Pastries
Bread
Yeast Rolls
Layer Cake
Fruit Pie (unbaked)
Ice Cream, Sherbert
Recommended storage
times at 0° F. (Months)
9–12
3–6
3–4
1–3
4–8
4–8
1–3
8–9
9–12
9–12
1–3
6
6
6–12
1–3
3–6
8
12
1–3
1–3
2–4
8
1–2
9
Care and Cleaning
!
Odor Removal
WARNING
1. Remove all food.
To avoid electrical shock which can cause severe
personal injury or death, disconnect power to freezer
before cleaning. After cleaning, restore power.
!
2. Wash all interior surfaces including door, floor and
walls according to "General" instructions. Pay special
attention to corners, crevices and grooves. Include all
accessories, shelves and gaskets.
3. Rinse and dry thoroughly.
CAUTION
To avoid personal injury or property damage, read and
follow all cleaning product manufacturer's directions.
4. Wrap foods in tightly sealed wrap or containers to
prevent further odor. After 24 hours, check if odor
was eliminated.
If odor was not eliminated, do the following:
1. Complete procedures in steps 1–3 above.
General
1. Wash surfaces with four tablespoons baking soda
dissolved in one quart warm water and a soft, clean
cloth.
2. Rinse surfaces with warm water. Dry surfaces
with a soft, clean cloth.
NOTE:
• Do not use the following items:
- abrasive or harsh cleaners, ammonia,
chlorine bleach, etc.
- concentrated detergents or solvents
- metal scouring pads
These items can scratch, crack and discolor
surfaces.
• Do not place shelves or accessories in dishwasher.
2. Pack freezer with crumpled sheets of black and white
newspaper.
3. Place charcoal briquettes randomly throughout
newspaper.
4. Close door and let stand 24–48 hours.
5. Remove charcoal briquettes and newspapers.
Wash all interior surfaces including door, floor and
walls according to "General" instructions. Pay special
attention to corners, crevices and grooves. Include all
accessories, shelves and gaskets.
6. Wrap foods in tightly sealed wrap or containers to
prevent further odor. After 24 hours, check if odor
was eliminated.
Adhesives
Remove glue residue by dabbing toothpaste over
adhesive. Rub toothpaste into adhesive with fingers until
adhesive loosens. Rinse surface with warm water. Dry
surface with a soft, clean cloth.
Door Gaskets
1. Clean door gaskets every three months or more
frequently if necessary.
2. Rinse and dry gaskets thoroughly.
3. Apply a light film of petroleum jelly on cabinet hinge
side to keep gaskets pliable.
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Care and Cleaning
Defrosting
Light Bulb (some models)
!
!
WARNING
To avoid electrical shock which can cause severe
personal injury or death, disconnect power to freezer
before defrosting. After defrosting, restore power.
Defrost freezer when frost has accumulated to 1/4".
Upper section of freezer will normally have more frost
than lower section.
1. Transfer food to an alternate cooling source.
To avoid electrical shock which can cause severe
personal injury or death, disconnect power to freezer
before replacing light bulb. After replacing light bulb,
restore power.
!
CAUTION
To avoid personal injury or property damage, observe
the following:
2. Remove toe grille by pulling forward.
3. Remove interior drain plug from freezer.
4. Verify drain pan is beneath drain opening to catch
defrost water.
5. Place pans of hot water in freezer.
6. Wash all interior surfaces including door, floor and
walls.
7. Replace inside drain plug. Drain plug must be
properly installed for efficient operation.
©2004 Maytag Services
WARNING
16023585
• Allow light bulb to cool.
• Wear gloves when replacing light bulb.
Remove light bulb cover by pressing front and back of
light bulb cover together. Replace light bulb with 15-watt
appliance bulb for manual defrost models and 40-watt for
auto defrost models.
11
General Tips
Energy Tips
Before Calling For Service
This freezer is designed to be one of the most
energy efficient freezers available. Reduce energy
use by doing the following:
• Operate in normal room temperatures away from heat
sources and direct sunlight.
Freezer does not operate.
• Confirm temperature control is on.
• Set controls no colder than necessary.
• Keep freezer full.
• Keep door gaskets clean and pliable. Replace gaskets
if worn.
Vacation Tips
For long vacations, do the following:
• Confirm freezer is plugged in.
• Check fuse or circuit breaker. Plug in another
item at that wall outlet.
• Wait 20 minutes to see if freezer restarts. If
freezer control is on, freezer may be in defrost
cycle.
Freezer still won’t operate.
• Unplug freezer. Transfer food to another unit or
place dry ice in freezer to preserve food.
• Call 1-800-NATLSVC (628-5782) inside U.S.A.
to locate an authorized servicer.
1. Empty freezer.
2. Unplug freezer.
Food temperature appears too warm.
• See above sections.
3. Clean freezer including door gaskets.
4. Prop doors open, so air can circulate inside.
• Allow time for recently added food to reach
freezer temperature.
Normal Operating Sounds
• Check gasket for proper seal.
Today’s freezers have new features and are more energy
efficient. As a result, certain sounds may be unfamiliar.
These sounds are normal and will soon become familiar.
These sounds also indicate freezer is operating and
performing as designed.
• Adjust temperature control.
1. Temperature Control
Freezer runs too frequently.
• It may be normal to maintain an even temperature.
• Doors may have been opened frequently or for
an extended period of time.
• Adjust temperature control.
Temperature control clicks when starting or
stopping compressor.
• Check gaskets for proper seal.
• Confirm freezer has proper clearance on each side.
2. Evaporator
Evaporator refrigerant flow gurgles, pops or sounds
like boiling water.
Water droplets form on outside of freezer.
Check door gaskets for proper seal.
3. Evaporator Fan Motor
Makes a whirring noise or sounds like rushing air.
Water is on floor beneath freezer.
• Confirm drain plugs are properly positioned.
4. Compressor
• Empty drain pan .
Compressor has a high pitched hum or pulsating
sound.
5. Defrost Heater
Sizzling, hissing, or popping sounds are caused by
water dropping on the defrost heater during the
defrost cycle.
6. Defrost Drain Pan
Dripping sounds is defrost water falling onto drain
pan.
Freezer has an odor.
See "Odor Removal" instructions in "Care and Cleaning"
section.
Freezer makes unfamiliar sounds or seems too loud.
It may be normal. See "Normal Operating Sounds"
section, this page.
7. Defrost Timer
Automatic timer sounds like an electronic clock that
snaps in and out of the defrost cycle.
8. Insulation
Foam insulation is very energy efficient and has
excellent insulating capabilities. However, foam
insulation is not as sound absorbent as previously
used fiberglass insulation.
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General Tips
Operating Sounds
Today’s freezers are designed for economical operation and energy efficiency. New features and designs may create
sounds which are different. Following are normal operating sounds which may be encountered, no service call is
required.
Defrost heater:*
Sizzling, hissing, or popping sounds are caused by water
dropping on the defrost heater during the defrost cycle.
Temperature control:
Clicks when the compressor
starts or stops.
Evaporator:
Gurgling sound, like boiling
water, when refrigerent flows
through the freezer cooling
coil.
Defrost timer:*
Automatic timer sounds like an
electric clock that snaps in and
out of the defrost cycle.
Freezer fan:*
Makes a whirring noise
or sounds like rushing
air as cold air circulates in
the freezer compartment.
Insulation:
High-efficiency foam is used for
its excellent energy insulation
capacity, even though it does not
offer the same level of sound
insulation as less energy-efficient
fiberglass insulation once found
in freezers.
Compressor:
Runs faster for higher
efficiency and has
a higher pitched hum
or pulsating sound.
Defrost drain pan:*
Dripping sound is defrost
water falling onto drain pan.
* Frost-free models only
©2004 Maytag Services
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13
Component Testing
To avoid risk electrical shock, personal injury, or death,
always disconnect electrical power source to the freezer
before attempting to service, unless test procedures require
power to be connected. When removing any wiring from terminals they must be replaced on the same terminals.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
! WARNING
Refrigeration System Test Procedures
Careful testing of the refrigeration system is essential in determining if a malfunction is present.
Temperature testing is accomplished by using a three lead thermocouple temperature tester in specific locations.
1. Test point 1, is attached to inlet on the evaporator coil
2. Test point 2, is attached to outlet on the evaporator coil.
3. Test point 3, is approximately 6–8 inches from suction port of compressor on the suction line.
4. Thermocouple tips should be attached securely to the locations specified.
5. Do not test during initial “pull down”, Allow one complete “OFF” cycle or a balanced temperature condition to occur
before proceeding.
6. Unit must operate a minimum of 20 minutes after thermocouples are installed.
NOTE: It may be necessary to turn control colder to maintain required operating time.
7. Wattage reading must be recorded with temperature test to confirm proper operation.
8. Suction and Head pressures are listed in the specification chart.
Condenser
Condenser
Evaporator
Heat
exchanger
Heat
exchanger
Suction
line
Dryer
Drier
Compressor
Suction
line
Discharge
line
Compressor
Evaporator
Refrigerant Flow Diagram
Manual Defrost
14
Discharge
line
Refrigerant Flow Diagram
Automatic Defrost
16023585
©2004 Maytag Services
Component Testing
To avoid risk electrical shock, personal injury, or death,
always disconnect electrical power source to the freezer
before attempting to service, unless test procedures require
power to be connected. When removing any wiring from terminals they must be replaced on the same terminals.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
! WARNING
Testing Main Condenser
Before testing condenser, verify no leaks exist
elsewhere.
Condenser loop must be disconnected from the system
and tested separately. The following illustration shows
the tubing as it is routed and fastened in the freezer
cabinet flange.
Condensor
bottom
external
Suction
NOTE: Verify a leak is not present in any external
tubing or joints before performing the following
test.
Following equipment is required to test.
• An access fitting.
• A drum of oil pumped nitrogen.
• Pressure regulator.
• Two gauges.
• Line valve and tubing.
Access fitting should be prepared as follows:
To
To
condensor evaporater
Discharge
From
condensor
Gauges
Pressure
regulator
Tube
process
Compressor Cutting or Unsoldering
Points No Defrost Models
Line
valve
Prepare equipment as required and test condenser as
follows:
1. Cut tubing at arrow “to condenser” and “from
condenser” as shown in the previous illustration.
2. Crimp and solder the end “to condenser” that enters
into the cabinet.
3. Silver solder access fitting of test equipment to the
end “from condenser” tube that emerges from the
cabinet.
4. Pressurize the system to 250 pounds with dry
nitrogen. Test all connections for leaks with a soap
solution.
5. Check the pressure gauge. If pressure drops, there is
a leak. However, it may be necessary to allow as
much as 24 hours for test results to verify no leaks
exist. If there are no leaks, reconnect the tubing.
Evacuate and recharge the system.
Nitrogen Tank and Fittings
Suction
To
Process
From
Discharge condensor
condensor
Tube
process
Compressor Cutting or Unsoldering
Points Refrigerated Shelf Models
©2004 Maytag Services
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15
Component Testing
To avoid risk electrical shock, personal injury, or death,
always disconnect electrical power source to the freezer
before attempting to service, unless test procedures require
power to be connected. When removing any wiring from terminals they must be replaced on the same terminals.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
! WARNING
Testing for Leaks
!
Compressor Electrical Tests
DANGER
Free oxygen will explode on contact with oil. Acetylene
will explode spontaneously when put under pressure.
To prevent violent explosions that may result in
serious injury or death to persons in or near the
immediate vicinity, NEVER use oxygen or acetylene
for pressure testing or cleanout of refrigeration
systems.
!
WARNING
To avoid severe personal injury or death from fire,
keep system free from contamination due to presence
of air. Follow instructions exactly.
Testing Compressor Direct
To test compressor with no other wiring in the circuit is
called “DIRECT TEST”. Safest way to check the
compressor is by using a compressor tester.
Electrical System
!
Compressor terminals on all models can be reached only
from the rear of the cabinet.
If freezer does not operate, do not assume compressor
has failed until all other possibilities are eliminated.
• Is current entering the compressor through the power
cord?
• Check for low voltage at the compressor terminals, a
minimum of 100 volts is required for compressor to
start.
• If the necessary voltage is available, check for failures
in:
• Overload protector
• Starting relay
• Temperature control
• Cabinet wiring harness
Run
Common
Start
WARNING
To avoid possible electric shock, personal injury or
death disconnect power before servicing. Follow
specific steps listed in this manual for testing or
replacement of a suspected failed component.
All electrical components are grounded to the cabinet.
The green center conductor of three wire lead cord is
also attached to the cabinet to provide a grounding circuit
when the lead cord is plugged into a properly grounded
electrical outlet. After replacing an electrical component,
always verify the ground wire is reconnected.
The electrical outlet from which the appliance is to
receive its power should always be checked to verify it is
properly wired.
Switch
Power
cord
Capacitor
connections
Compressor Tester
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©2004 Maytag Services
Component Testing
To avoid risk electrical shock, personal injury, or death,
always disconnect electrical power source to the freezer
before attempting to service, unless test procedures require
power to be connected. When removing any wiring from terminals they must be replaced on the same terminals.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
! WARNING
Tester leads are marked “RUN”, “START” and “COMMON”.
Connect common lead to common terminal, start lead to
start terminal and run lead to run terminal of the
compressor.
Common
Start
Run
Overload Protector
Overload protector is located under the terminal cover on
the compressor. If compressor becomes overheated
and/or draws too much current, overload trips open and
shuts compressor off. If overload does this repeatedly,
the compressor is “cycling on the overload”.
Cycling on the overload may be caused by:
• Insufficient air circulation around the compressor and
condenser
• Pull down overload (caused by a large quantity of
warm food placed in the freezer)
• Compressor stalling due to lack of pressure unloading
• Low line voltage
• Failed starting relay
Compressor Terminals
Testing Overload Protector
The other two leads are for the start capacitor. When not
in use, connect the two leads together in the “OFF”
position. Verify there are no bare leads touching the
cabinet. Plug in the tester cord and flip the switch to
“START” position. As soon as the compressor starts,
release the switch to “RUN” position.
If compressor starts, trouble is in another electrical
component (overload protector, starting relay,
temperature control or wiring harness).
If compressor fails to start (or run) compressor has failed
and must be replaced.
Perform continuity check on compressor.
1. Check resistance of compressor windings:
a. Attach ohmmeter between winding C and S,
Ohmmeter indicates <10 Ω but > 0 Ω.
b. Attach ohmmeter between winding C and M,
Ohmmeter indicates <10 Ω but > 0 Ω.
2. Check compressor for grounds:
• Attach one ohmmeter lead to compressor case.
Attach second ohmmeter lead to C, then S, then M
terminals on compressor. Ohmmeter indicates
open on each terminal.
To test the overload protector, remove compressor
terminal cover. Examine bottom of the overload for
possible signs of arcing. If there are no signs of arcing,
check for continuity across the terminals, there should be
a reading of approximately 0.7 ohms. If continuity is not
indicated replace overload protector.
Overload protector
Overload Protector Terminals
When examining the overload protector, evidence of
arcing is present, replace overload protector.
Capacitor
Capacitor can be tested by an analog meter. Attach one
meter lead to one terminal and once the other meter lead
touches the second terminal meter will indicate a reading
but will discharge through the meter and indicate no
reading. Reverse the meter leads and indication will be
the same. If testing with a digital meter, the only
indication will be, capacitor has a direct short.
©2004 Maytag Services
16023585
17
Component Testing
To avoid risk electrical shock, personal injury, or death,
always disconnect electrical power source to the freezer
before attempting to service, unless test procedures require
power to be connected. When removing any wiring from terminals they must be replaced on the same terminals.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
! WARNING
PTC Relay
Interior Light and Switch
PTC relay is a push-on type that mounts to the start and
run terminals of the compressor. It is a magnetic switch
with starting contacts. Its magnetic coil is in series with
the run winding of the compressor.
When current is applied to the compressor, the magnetic
coil raises the relay plunger and closes the starting
contacts, connecting the start winding in parallel with the
run winding. As the compressor motor approaches
running speed, current in the run winding and in the relay
coil decreases and plunger “drops out” opening the start
winding circuit. Compressor motor continues to operate
on the run winding.
If the light does not operate and bulb is good, place the
blade of a putty knife or similar object under the flange of
the switch and carefully remove. Short across the light
switch terminals. If light operates, switch has failed. If
light fails to operate, either the lamp socket or wiring has
failed.
The lamp socket in the cabinet can be removed in the
following manner:
1. Disconnect power cord from electrical outlet.
2. On refrigerated shelf models, remove screws
securing top freezer plate and pull the plate down
slightly.
On no defrosting models, remove the light housing
from food liner top.
3. Unplug light leads and disconnect grounding wire.
Check the socket with an ohmmeter or test cord to
verify it has failed.
4. Place new light socket into opening of the housing. If
necessary, wet for lubricating purposes.
5. Replace light housing in reverse order of removal,
verify green grounding wire is securely attached.
Testing PTC Relay
Disconnect relay from compressor terminals. Place
meter leads on relay terminals 2 and 3, or 5 and 6, a
reading of approximately 4.7 ohms should be indicated.
8
3
7
2
5
6
Checking Control Operation
4
1
Front
Back
Testing PTC Relay With An Ohmmeter
Connect one meter lead to terminal 8 and the other
meter lead to terminal 2 on the relay. There should be no
continuity (open circuit). Connect one meter lead to
terminal 8 and the other meter lead to terminal 3 on the
relay. There should be no continuity (open circuit). If not,
PTC relay has failed and must be replaced.
A failed control (contact points stuck open or closed, a
leak in the bellows) may cause compressor to run
continuously or not at all. Should one of these conditions
exist, check the control as follows:
1. Remove control knob and control mounting screws.
2. Work control out of opening far enough to reach the
terminals (on no-defrosting models, it may be
necessary to remove feeler tube cover and straighten
feeler tube enough to allow control to be pulled out
far enough).
3. Look for faulty wiring connections.
4. Check for control points stuck or closed as follows:
• If compressor will not run, short across the control
terminals. If compressor starts, control has failed and
must be replaced. If compressor does not start, check
cabinet wiring and compressor components for
failures.
On no defrosting models verify timer is not in the
defrost cycle.
If compressor runs all the time, even though freezer
temperature is below the control cut-out point, make the
following applicable check
On refrigerated shelf models, check control feeler
tube attachment to underside of shelf front for a
positive thermal contact.
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©2004 Maytag Services
Component Testing
To avoid risk electrical shock, personal injury, or death,
always disconnect electrical power source to the freezer
before attempting to service, unless test procedures require
power to be connected. When removing any wiring from terminals they must be replaced on the same terminals.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
! WARNING
On no-defrosting models, check control feeler tube
cover to verify air is allowed to pass freely under it
and circulate around the feeler tube.
If compressor continues to run, disconnect wire from one
control terminal. If compressor stops, control has failed
and must be replace. If compressor still runs, check
cabinet wiring for a short circuit.
Temperature Control
Freezer temperature should vary considerably by
changing control knob setting. If not, check control cut-in
and cut-out temperatures as follows:
1. On no-defrost models, disconnect control feeler tube
cover from food liner side by pulling straight out at its
center. Fasten a thermocouple to feeler tube with a
rubber band.
Defrost Timer
Freezer coil defrost system is actuated by an electric
timer which is located on the rear leg of the cabinet.
Timer initiates defrost cycle every twelve hours of
compressor running time, regardless of control setting or
of interior temperatures.
1st Click —Timer switches off compressor and freezer
fan circuit. At the same time it energizes the defrost
circuit for approximately 30 minutes.
Once defrost heater warms coil header to approximately
52 degrees, defrost thermostat contacts open to shut off
the heater.
Defrost Timer Circuits
Line
(white)
To compressor
3
2
Timer
4
1
Attaching Thermocouple to Feeler Tube
No Defrost Models
Line
(red)
On refrigerated shelf models, use a few drops of
water to freeze the bulb on thermocouple to the
freezer shelf near control feeler tube thermal contact
point.
2. Set control halfway between “Off” and “MAX.-Cool”.
Close cabinet door and wait for compressor to run
through 2 or 3 complete cycles.
3. If cut-in and cut-out temperatures are not within 2 or 3
degrees of those specified below replace the control.
Control
2nd Click—Timer switches off defrost circuit and starts
compressor and freezer fan to end the defrost cycle.
Compressor, freezer fan, and defrost timer are now
controlled by the temperature control for a period of
approximately 12 hours, after which a new defrost cycle
begins.
Line
(white)
To compressor
Auto
Defrost
Yes
No
Temperature Control
Warm Calibration Pt.
Cut-in
Cut-out
45°
cut-in
135°
15 ± 3 −6.8 ± 2 −18.4 ± 2
14 ± 3 +8 ± 2
−8 ± 2
MID 180°
Cold cut-out
3
315°
−29.2 ± 2
−22 or below
Timer
1
Line
(red)
©2004 Maytag Services
16023585
2
4
Control
19
Component Testing
To avoid risk electrical shock, personal injury, or death,
always disconnect electrical power source to the freezer
before attempting to service, unless test procedures require
power to be connected. When removing any wiring from terminals they must be replaced on the same terminals.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
! WARNING
Checking Timer
Unplug line cord from electrical outlet. Remove 1/4 Spin
Tight screws and remove the timer. Disconnect all wires
from timer and attach ohmmeter leads to terminals
specified in the accompanying chart. If no continuity is
indicated, timer has failed and must be replaced. When
replacing timer, connect wire leads to timer terminals.
Verify grounding wire is connected.
Ground
wire
Timer
mounting
screws
Timer
Ground
wire
Defrost Timer Mounting
To test
Timer motor
circuit
Defrost circuit
Compressor
circuit
Turn timer
knob to
Leave as is
st
1 click
nd
2 click
Check
between
terminals
1 and 3
1 and 2
1 and 4
Turn defrost timer one full turn clockwise to locate start
defrost cycle (1st click) and end defrost cycle (2nd click)
positions. The 1st and 2nd clicks are only a few degrees
of shaft rotation apart. Turn the shaft slowly and stop
immediately when the 1st click is heard.
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Defrost Heater and Thermostat
No-Defrosting Models
Defrost heater is a radiant heater and will melt all frost
that collected during the proceeding 12 hour period when
operating properly. Failure to perform this function will
eventually cause an ice build-up between the coil fins,
blockage in air flow and unsatisfactory refrigeration.
Defrost heater extends across the bottom of freezer coil
above the built-in-drain trough. Heater is clamped at both
ends to a shield. Shield is attached to coil mounting
panel and is slotted to permit free drainage into the drain
trough.
Defrost thermostat is located on upper header of freezer
coil. Thermostat senses temperature of the header and
automatically shuts off the defrost heater when
temperature reaches 51°F (11°C).
To test defrost thermostat and defrost heater when the
freezer coil temperature is + 15°F (-9°C) or below, use a
wattmeter or an ohmmeter and proceed as follows:
1. Disconnect freezer line cord plug from electrical outlet
and plug it into wattmeter.
2. Plug-in wattmeter line cord into electrical outlet and
manually advance timer to defrost cycle.
3. Wattmeter should indicate approximately 430 watts
(total wattage of timer motor and defrost heater). If
indication is 3 watts, defrost heater or defrost
thermostat has failed. To isolate failed component,
proceed to step 4. However, if indication is 430 watts,
timer has (not advancing to defrost) failed and must
be replaced.
4. Disconnect freezer line cord plug from wattmeter.
5. Remove freezer coil cover and check defrost heater
for continuity. If heater shows continuity, defrost
thermostat has failed and must be replaced.
NOTE: Set meter to X1 scale. If reading is
approximately 35 ohms, defrost thermostat and
defrost heater are operative.
©2004 Maytag Services
Component Testing
To avoid risk electrical shock, personal injury, or death,
always disconnect electrical power source to the freezer
before attempting to service, unless test procedures require
power to be connected. When removing any wiring from terminals they must be replaced on the same terminals.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
! WARNING
Freezer Fan No-Defrosting Models
Testing Freezer Fan Motor
Freezer fan is designed and located in the cabinet to
create movement of uniform low temperature air
throughout freezer interior. It is wired to run
simultaneously with the compressor.
If fan fails to operate, or runs erratically, reduced air
circulation will cause unsatisfactory temperatures
throughout the freezer.
Freezer fan is located above freezer coil and is mounted
inside an opening in the freezer liner back.
Remove screws from coil cover and disconnect ground
wire from cover. Remove freezer coil cover.
Before checking fan circuit for failures, spin the fan blade
to verify nothing has lodged against it which could
prevent normal fan operation. If blade spins freely, check
fan motor as follows:
1. Unplug line cord.
2. Attach test cord leads to fan motor leads. If motor
runs, check all cabinet wiring for an open circuit. If
motor fails to operate, remove and replace.
Green
White
Red
Orange
White
Circulating Fan and Wiring
With Coil Cover Removed
©2004 Maytag Services
16023585
21
Component Testing
To avoid risk electrical shock, personal injury, or death,
always disconnect electrical power source to the freezer
before attempting to service, unless test procedures require
power to be connected. When removing any wiring from terminals they must be replaced on the same terminals.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
! WARNING
22
Capacity
Cu. Ft.
11.6
Insulation
Type
Foam
15.2
Foam
16.8
Foam
19.6
Foam
15.0
Foam
16.8
Foam
19.6
Foam
Performance Data at Control Setting # 4
Manual Defrost
Amb
Wattage
%
High
Low
Running
Side
Side
−5 −3
70°
90−110
35−45
95−115
90°
95−115
50−60
125−145 −4 −2
110°
100−120
80−90
170−190 −2 0
−4 −2
70°
95−115
35−45
95−115
90°
100−120
55−65
125−145 −3 −1
110°
105−125
90−100
165−185 −3 −1
−4 −2
70°
105−125
40−50
95−115
90°
110−130
55−65
130−150 −3 −1
110°
115−135
90−100
165−185 −2 1
70°
120−140
40−50
100−120 −4 −2
90°
125−145
55−65
135−155 −3 −1
110°
130−150
90−100
175−195 −1 −1
Performance Data at Control Setting # 4
Auto Defrost
70°
125−145
45−55
105−125 −3 −1
90°
130−150
60−70
140−160 −3 −1
110°
135−155
90−100
185−205 −1 1
70°
135−155
35−45
100−120 −3 −1
90°
140−160
45−55
135−155 −2 0
110°
145−165
90−100
175−195 −2 0
−4 −2
70°
135−155
40−50
95−115
90°
140−160
60−70
130−150 −4 −2
110°
145−165
90−100
175−195 −2 0
16023585
Amps
0.7−1.0
0.8−1.1
0.8−1.1
0.9−1.2
0.9−1.2
1.0−1.3
0.9−1.2
0.9−1.2
1.0−1.3
1.0−1.3
1.0−1.3
1.2−1.5
1.0−1.3
1.1−1.4
1.2−1.5
1.2−1.5
1.2−1.5
1.2−1.6
1.2−1.5
1.2−1.5
1.3−1.6
Running
Capacitor
12 uF
210 V
12 uF
210 V
12 uF
210 V
12 uF
210 V
12 uF
210 V
12 uF
210 V
12 uF
210 V
©2004 Maytag Services
Disassembly Procedures
!
To avoid risk of electrical shock, personal injury or
death; disconnect power to unit before following any
disassembly procedures.
WARNING
Replacing Drier
NOTE: A new drier must be installed whenever any
system component is replaced, or whenever the
system is opened.
The replacement drier is sealed at both ends to prevent
entrance of moisture. Do not break these seals until all
preparations for the installation have been completed.
1. Disconnect line cord from electrical outlet.
2. Clean the process tube using steel wool or fine emery
cloth.
3. Install service valve as close as possible to the tip of
the process tube, for easy pinch-off after recharging
the system.
4. Connect a hose to the service valve and capture the
charge.
NOTE: Effective July 1, 1992, before opening any
refrigeration system it is the responsibility of the
service technician to capture the refrigerant for
safe disposal.
5. Remove all paint and scale from the capillary tube for
a distance of approximately three inches from the
original joint, (use steel wool or emery cloth).
6. Cut the capillary tube approximately one inch from
the old joint. Verify the cut is uniform around the
tubing, then break it with the fingers.
1"
Score here
then snap tube
Cutting Capillary Tube
7. Cut the drier from condenser outlet and thoroughly
clean the end of the tube.
8. Make an offset 1/2 inch (13 mm) from the end of the
capillary tube to prevent its penetrating too far into
drier tubing. When forming the offset, use a radius
large enough so the inside diameter of the tubing is
not reduced.
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Condenser end
inlet end
Flow
direction
Capillary end
outlet end
Form offset
Capillary Tube Insertion
9. Cut the inlet tube on the new drier.
10.Snap off the scored end of replacement drier with
your fingers.
11. Install new drier and solder all joints. Use sil-fos on all
copper to copper joints. On copper to steel joints,
silver solder with proper flux must be used. Excess
flux must be wiped off after soldering.
12.Visually check all soldered joints, evacuate and
recharge the system.
13.Test run the unit to verify proper operation.
14.Pinch process tube and cut off the service valve.
Solder the joint and test for leaks.
Replacing Compressor
Replacement compressors are charged with the correct
amount of oil and contain a holding charge of either dry
nitrogen or a refrigerant.
The replacement compressor will be similar to the type of
compressor originally used and may or may not have an
oil cooler. If the sealed system does not use the oil
cooler, do not disturb the oil cooler plugs. Simply
disregard the oil cooler.
The holding charge assures compressor is dry. A
compressor which shows no evidence of internal
pressure when cutting the line or pulling the plugs,
should be returned for replacement.
When replacing a compressor, cut as close to the
soldered joints as possible. If tubes are not long enough,
it may be necessary to unsolder the joints to allow
connections to the replacement compressor.
When replacing compressor, proceed as follows:
1. Disconnect line cord from electrical outlet.
2. Install a service valve on the process tube.
3. Connect a hose to the service valve and capture the
charge.
NOTE: Effective July 1, 1992, before opening any
refrigeration system it is the responsibility of the
service technician to capture the refrigerant for
safe disposal.
4. Clean the tubing approximately three inches (76 mm)
at the point of intended cut. Before cutting the tube,
verify it will be long enough to reconnect to the
replacement compressor. If not, unsolder the joints.
©2004 Maytag Services
Disassembly Procedures
!
To avoid risk of electrical shock, personal injury or
death; disconnect power to unit before following any
disassembly procedures.
WARNING
5. Disconnect wire from compressor terminals
6. Remove retaining clips from compressor mounts. Lift
compressor from mounting rails and transfer the
rubber grommets to replacement compressor.
7. Set replacement compressor into position and install
retaining clips.
8. Remove all rubber plugs, clean the stubs of the
compressor and compare the size of tubing to stubs
of replacement compressor. It may be necessary to
swage the copper tubing in order to make the joints.
9. Install a six inch (152 mm) long copper tube to low
side process tube on the compressor. Add service
valve to end of this tube.
10.Connect all tubing, apply flux to compressor stubs
and solder all the joints. Excess flux must be wiped
off after soldering.
11. Install a new drier.
12.Visually check all joints for leaks. Evacuate and
recharge the system.
13.Reconnect wire leads to compressor terminals and
test run the unit to verify proper operation.
14.Pinch process tube and cut off the service valve.
Solder the joint and test for leaks.
Replacing Heat Exchanger Refrigerated
Shelf Models
1. Disconnect line cord from electrical outlet.
2. Install a service valve as close as possible to the tip
of process tube, for easy pinch-off after recharging
the system.
3. Connect a hose to the service valve and capture the
charge.
NOTE: Effective July 1, 1992, before opening any
refrigeration system it is the responsibility of the
service technician to capture the refrigerant for
safe disposal.
4. Remove butyl sealer from around the tube entry hole.
5. Unsolder suction tubing at compressor stub or cut
tubing three inches (76 mm) from compressor stub.
6. Cut drier from condenser tubing. Then cut drier from
capillary tube.
7. Straighten heat exchanger tubing to slide tube
through entry hole from inside the cabinet.
8. Remove clamp retaining the control feeler tube to
underside of second shelf (counting downward).
9. Carefully bend feeler tube down against liner side to
be out of the way.
10.Remove screws securing top freezer plate to liner
top. As front edge of plate drops clearing the liner.
11. Carefully remove each shelf from food liner support
rails. Push outward on liner side just above front
retainer embossment. Lift shelf front free of retainer.
If necessary, repeat this operation on opposite side.
©2004 Maytag Services
16023585
12.Pull entire shelving assembly out of cabinet and
position to allow detachment of heat exchanger.
Freezer Shelf Assembly Joints
Refrigerated Shelf Model
13. Unsolder capillary tube and suction line (cut suction
line away from original joint and swedge the end of it
for new tubing, if desired).
14.Clean joints and solder new heat exchanger to
shelving assembly. Clean & paint soldered joints
before reinstalling evaporator.
15.Transfer vinyl insulating sleeve to new heat
exchanger. Tape the same points.
16.Carefully position assembly back in the cabinet, verify
heat exchanger tubing passes through the opening
without damaging the vinyl sleeve.
17.Carefully work each shelf into its proper support rails.
Replace non-refrigerated shelf in the same manner.
18.Secure control feeler tube to correct shelf with the
clamp. Verify feeler tube rests firmly against shelf
surface to obtain thermal contact.
19.Fasten top freezer plate, verifying all spacers are in
place.
20.Form heat exchange so it is similar in position to the
original. Be careful when bending the tubing at the
entry hole to prevent kinks.
21.Pack entry hole with butyl sealer.
22.If suction tubing was cut from compressor when
removed, swedge compressor suction tube to fit
replacement suction tubing.
23.Solder the suction lines.
24.Install new drier.
25.Visually check all joints for leaks. Evacuate and
recharge the system.
26.Test run the unit to verify proper operation.
27.Pinch process tube and cut off the service valve.
Solder the joint and test for leaks.
27
Disassembly Procedures
!
To avoid risk of electrical shock, personal injury or
death; disconnect power to unit before following any
disassembly procedures.
WARNING
Replacing Heat Exchanger No-Defrosting
Models
1. Disconnect line cord from electrical outlet.
2. Install service valve as close as possible to the tip of
process tube for easy pinch-off after recharging the
system.
3. Connect a hose to the service valve and capture the
charge.
NOTE: Effective July 1, 1992, before opening any
refrigeration system it is the responsibility of the
service technician to capture the refrigerant for
safe disposal.
4. Remove butyl sealer from around tube entry hole.
5. Unsolder suction tubing at compressor stub or cut
tubing three inches (76 mm) from compressor stub.
6. Cut drier from condenser tubing. Then cut drier from
capillary tube.
7. Remove screws securing freezer coil cover and
detach green grounding wire.
Green
Removing Defrost Thermostat
No Defrost Models
13. Detach green grounding wire from freezer coil header.
14. Remove screws securing freezer coil to coil mounting
panel. Coil is now free to be removed.
15.Straighten heat exchanger tubing to pass through the
opening in the cabinet back.
16.Pull entire assembly out of the cabinet.
17.Unsolder cap tube and suction line from freezer coil,
careful not to overheat the epoxy joints.
White
Red
Orange
White
Unsolder
these joints
Circulating Fan and Wiring
With Coil Cover Removed
8. Remove styrofoam air block from each end of the
coil.
9. Disconnect defrost heater lead from spade terminal
on fan motor.
10.Spade connector is used to join the defrost heater
lead to the lead-in wire. Separate these two wires at
the spade connector. Release lead from the two clips
on coil mounting panel.
11. Disconnect heater lead from defrost thermostat.
12.Remove defrost thermostat from coil header to
release the front tang. See following illustration.
Protect
these joints
Heat Exchanger To Freezer Coil Joints
No-Defrost Models
18. Transfer rubber insulating sleeve to replacement heat
28
16023585
©2004 Maytag Services
Disassembly Procedures
!
To avoid risk of electrical shock, personal injury or
death; disconnect power to unit before following any
disassembly procedures.
WARNING
exchanger assembly and tape the same points.
19.Clean tubing and silver solder new heat exchanger to
coil with proper flux. Excess flux must be wiped off
after soldering.
20.Clean tubing and silver solder new heat exchanger to
the coil.
21.Work new tubing through rear opening, careful not to
tear rubber sleeve.
22.Position freezer coil and install mounting screws.
Replace styrofoam air blocks at the upper ends of the
coil. This is necessary to channel the air flow properly
through the coil.
23.Carefully form tubing and route it in the same manner
as the original. Use extreme care when bending the
tubing at entrance hole to prevent kinking. Pack entry
with butyl sealer.
24.Clean the suction line and silver solder the joint with
proper flux. Excess flux must be wiped off after
soldering.
25.Install new drier.
26.Visually check all joints for leaks. Evacuate and
recharge the system.
27.Lace the defrost heater leads to both ends of the
freezer coil. Fasten wire leading to fan motor to the
two clips on the mounting panel.
28.Connect white defrost heater lead to white lead-in
wire with spade connector, attach other wire to spade
terminal on fan motor.
29.Secure defrost thermostat to coil and connect lead
wire.
30.Connect green grounding wire to fan motor and to
freezer coil cover.
31.Reinstall coil cover and secure with screws.
32.Test run the unit to verify proper operation.
33.Pinch process tube and cut off the service valve.
Solder the joint and test for leaks.
Replacing Freezer Shelving Refrigerated
Shelf Models
Current freezer models are equipped with steel shelves
and can be individually repaired or replaced as follows:
1. Disconnect line cord from electrical outlet.
2. Install service valve as close as possible to the tip of
process tube, for easy pinch-off after recharging the
system.
3. Connect a hose to service valve and capture the
charge.
NOTE: Effective July 1, 1992, before opening any
refrigeration system it is the responsibility of the
service technician to capture the refrigerant for
safe disposal.
4. Remove butyl sealer from tube entry hole in the
©2004 Maytag Services
16023585
cabinet back.
5. Cut the end off of compressor process tube after the
refrigerant has been captured. Attach a service valve
to it, and leave the valve open.
6. Cut drier from condenser tubing. Cut drier from
capillary tube. To cut capillary tube, score the walls
with a knife or file. Cut around entire tube uniformly,
then break it with your fingers.
1"
Score here
then snap tube
Cutting Capillary Tube
7. Straighten heat exchanger tubing to slide tube
through entry hole from inside the cabinet.
8. Remove clamp securing control feeler tube to
underside of second shelf (counting downward).
9. Carefully bend feeler tube down against liner side to
be out of the way.
10.Remove screws securing top freezer plate to liner
top. Front edge of the plate, drops clear of the liner,
disconnect lead wires from interior light, if equipped.
11. Carefully remove each shelf from the food liner
support rails. Push out on liner side just above front
retainer embossment. Lift the shelf front free of the
retainer. If necessary, repeat this operation on the
opposite side.
12.Carefully pull entire shelving assembly out of cabinet
and position to allow detachment of failed shelf.
13.Cut or unsolder failed shelf and remove.
14.Clean joints and solder new shelf to assembly and
paint new joints.
15.Carefully position assembly back in the cabinet,
verifying heat exchanger tubing passes through rear
opening without damaging the rubber sleeve.
16.Carefully work each shelf into its proper support rails.
Replace non-refrigerant shelf in the same manner.
17.Connect wiring to freezer light, if equipped, and
fasten top freezer plate, verifying all spacers are in
place.
18. Secure control feeler tube to correct shelf with the
29
Disassembly Procedures
!
To avoid risk of electrical shock, personal injury or
death; disconnect power to unit before following any
disassembly procedures.
WARNING
clamp. Verify feeler tube rests firmly against shelf
surface to obtain thermal contact.
19.Form heat exchanger tubing so it is similar in position
to the original. Be careful when bending tubing at the
entry hole to prevent kinks.
20.Pack tube entry hole with butyl sealer.
21.If cut when remove, swedge compressor suction
tubing to fit replacement tubing
22.Install new drier and connect all tubing. Silver solder
the joints with proper flux. Excess flux must be wiped
off tubing after soldering.
23.Visually check all joints for leaks. Evacuate and
recharge the system.
24.Test run the unit to verify proper operation.
25.Pinch process tube and cut off the service valve.
Solder the joint and test for leaks.
Green
White
Red
Orange
White
Circulating Fan and Wiring With
Coil Cover Removed
Replacing Freezer Coil No-Defrosting
Models
Because of freezer coil location, do not attempt
replacement without first removing coil and heat
exchanger from the cabinet. Even though an
experienced silver brazer can control a torch flame,
possibility of overheating and distorting plastic is high.
1. Disconnect line cord from electrical outlet.
2. Install service valve as close as possible to tip of
process tube for easy pinch-off after recharging the
system.
3. Connect a hose to service valve and capture the
charge.
10. Spade connector is used to join the white defrost
heater lead to the white lead-in wire. Separate these
wires at the spade connector. Release heater lead
from the two clips on the coil mounting panel and
unlace it from the coil.
11. Disconnect white defrost heater lead from defrost
thermostat and unlace it from freezer coil.
12.Remove defrost thermostat from coil header to
release the front tang.
NOTE: Effective July 1, 1992, before opening any
refrigeration system it is the responsibility of the
service technician to capture the refrigerant for
safe disposal.
4. Remove butyl sealer from tube entry hole in the
cabinet back.
5. Clean approximately three inches (76 mm) of the
heat exchanger tubing at the compressor stub.
Unsolder at the joint or cut three inches (76 mm)
from the stub.
6. Unsolder drier from condenser outlet tube and clean
the outlet. Remove drier from capillary tube so tubing
assembly can be pulled through the tube entry
opening.
7. Remove screws securing freezer coil cover. Lift cover
out and detach green grounding wire.
8. Remove styrofoam air block from each end of the
coil.
9. Disconnect defrost heater lead from spade terminal
on fan motor.
30
16023585
Removing Defrost Thermostat
No-Defrost Models
13. Detach green grounding wire from freezer coil header.
14. Remove screws securing freezer coil to coil mounting
panel. The coil is now free to be removed.
15. Straighten heat exchanger tubing to pass through the
©2004 Maytag Services
Disassembly Procedures
!
To avoid risk of electrical shock, personal injury or
death; disconnect power to unit before following any
disassembly procedures.
WARNING
opening in the cabinet back.
16.Pull entire assembly out through the front. Position to
allow detachment of heat exchanger.
17.Unsolder suction and capillary tube from the coil.
Unsolder
these joints
to freezer coil header.
29.Connect green grounding wire to fan motor and to
freezer coil cover.
30.Test run the unit to verify proper operation.
31.Pinch process tube and cut off the service valve.
Solder the joint and test for leaks.
Replacing Light Switch
1. Unplug line cord from electrical outlet and pry light
switch from liner.
2. Pull lead wires out far enough to disconnect
connectors.
3. Connect new switch, plug in line cord, and check the
light.
4. Push new switch and wiring into position.
Protect
these joints
Heat Exchanger To Freezer Coil Joints
No-Defrost Models
18.Remove freezer coil and replace with new coil.
19.Clean and connect tubes and silver solder the joints
with proper flux. Excess flux must be wiped off tubing
after soldering.
20.Work heat exchanger tubing through rear opening,
careful not to tear rubber sleeve.
21.Position freezer coil and install mounting screws.
Replace styrofoam air blocks at the upper ends of
freezer coil. This is necessary in order to channel air
flow through the coil.
22.Carefully form tubing and route in the same manner
as the original. Use extreme caution when bending
tubing at the entrance hole to prevent a possible kink.
Pack entry hole with butyl sealer.
23.If cut when removed, swedge compressor suction
tube to reconnect suction tubing.
24.Clean all the tubes. Install new drier and silver solder
the joints with proper flux. Excess flux must be wiped
off tubing after soldering.
25.Visually check the joints for leaks. Evacuate and
recharge the system.
26.Lace white heater leads to both ends of the freezer
coil. Fasten wire leading to fan motor to the two clips
on the mount-panel.
27.Join white defrost heater lead and white lead-in wire
with spade connector and attach spade terminal on
fan motor.
28. Connect defrost thermostat lead and fasten thermostat
©2004 Maytag Services
16023585
Replacing Control
1. Unplug the power cord.
2. Pull control knob off, remove control mounting
screws, and disconnect all wires.
3. On refrigerated shelf models, remove feeler tube
from underside of shelf front by loosening the clamp.
On no-defrosting models, disconnect control feeler
tube cover from the liner side by pulling straight out at
its center.
4. On refrigerated shelf models, securely tape a piece
of heavy string to the end of the feeler tube.
On no-defrosting models, observe feeler tube is
coiled behind the cover, then straighten it.
5. Pull complete assembly out of cabinet, (on
refrigerated shelf models, string end should follow
through the hole in the liner side so it can be used to
pull replacement back through.
6. Transfer plastic sleeve to new feeler tube.
7. On refrigerated shelf models, tape string to new
feeler tube. Pull tube through the hole in the liner
side.
On no-defrosting models, work feeler tube through
the opening and reshape it so it will not contact the
inner side or cover.
8. Connect all wires, including grounding wire, and push
control into position.
9. Reinstall mounting screws.
10.On refrigerated shelf models, secure feeler tube to
underside of shelf front.
On no-defrosting models, attach feeler tube cover by
bowing it out at the center until tabs on the cover can
be fitted into slots in the liner.
11. Reinstall control knob. Plug in power cord and check
freezer operation.
Replacing Heater
31
Disassembly Procedures
!
To avoid risk of electrical shock, personal injury or
death; disconnect power to unit before following any
disassembly procedures.
WARNING
Remove defrost heater as follows:
1. Remove freezer coil cover.
2. Detach heater leads and unlace from freezer coil.
3. Remove clips at each end of heater. Push downward
on heater shield grasping radiant heater at both ends
and lifting outward.
Retaining
clip
Defrost Heater and Retaining Clips
4. Replace heater in reverse of removal.
!
CAUTION
Replacing Freezer Fan Motor
Remove screws from coil cover and disconnect ground
wire from cover. Remove freezer coil cover.
Before checking fan circuit for failures, spin the fan blade
to verify nothing has lodged against it which could
prevent normal fan operation. If blade spins freely, check
fan motor as follows:
1. Unplug line cord.
2. Attach test cord leads to fan motor leads. If motor
runs, check all cabinet wiring for an open circuit. If
motor fails to operate, remove and replace it in the
following manner.
3. Disconnect lead and ground wire from fan motor.
4. Remove complete fan motor assembly by removing
screws securing fan motor bracket to mounting
panel. Remove motor from bracket. Replace
assembly in reverse order of removal.
5. Attach ground wire to freezer coil cover and replace
the cover.
No alignment is necessary when replacing fan blade. Fit
blade on the shaft and push. Blade is equipped with a
built-in stop.
When installing radiant heater do not touch the heater
glass. Salt and oil on the hands may cause serious
damage.
Thermostat may be loosened for replacement by merely
spreading front tangs of retainer clips.
Defrost Thermostat and Mounting Clip
32
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©2004 Maytag Services
Disassembly Procedures
!
To avoid risk of electrical shock, personal injury or
death; disconnect power to unit before following any
disassembly procedures.
WARNING
Cabinet Door Assembly
Cabinet door assembly consists of outer door panel, bezel and nameplate insert, door handle and insert, door lock
assembly (if equipped), hinge bushings, fiberglass insulation, inner door liner, door shelf trim, and door seal gasket.
Top door hinge
Tapping plate
Washer
Outer door panel
Serial plate
Bezel
Bushing
Door handle
Door
gasket
Lock
assembly
Insert
Door
shelf
trim
Bushing
Kickplate
Inner door liner
Clip
Washer
Spacer
Lower door hinge
Bottom
hinge
nut
©2004 Maytag Services
16023585
33
Disassembly Procedures
!
To avoid risk of electrical shock, personal injury or
death; disconnect power to unit before following any
disassembly procedures.
WARNING
Removing Cabinet Door Assembly
1. Remove screws securing upper hinge to cabinet top.
2. Open door assembly and lift door off lower hinge pin.
Install Cabinet Door Assembly
1. Hold door assembly in open position and place on
lower hinge with hinge pin entering the hinge bushing
at the door bottom.
2. Close door and install upper hinge mounting screws.
Check gasket seal.
Install Door Liner And Gasket
The DURA-LAST inner door liner and gasket are
mounted to outer door panel by screws place every 4
inches (102 mm) around the door flange perimeter.
Door Lock Assembly
Door lock assembly (if equipped) is attached to outer
door panel and consists of the cam and bolt (lock bolt).
Illustration below indicates movement of the lock bolt as
the key is turned clockwise to locked position. An ejector
spring in the lock forces the key out. Key will not remain
in the lock once it is released, regardless of position the
lock is in.
Locked
Removing Inner Liner and Gasket.
1. Remove cabinet door assembly as previously
described.
2. Lay door assembly on a flat, padded surface.
3. Remove all mounting screws and lift off inner liner
and gasket.
Installing Inner Liner and Gasket
1. Position gasket around inner panel so gasket lip will
be sandwiched between inner liner and outer door
panel flange.
2. Replace and tighten all inner liner mounting screws
until snug.
NOTE: Do not over tighten screws, this could crack
liner or cause screw head to pull through the
hole.
3. Always align door.
Door Handle
Door handle and insert are attached to outer door panel
by mounting screws which are located under the insert.
Removing the Door Handle
1. Bow insert slightly and unhook top and bottom from
door handle.
2. Remove mounting screws which secure the handle.
Unlocked
Lock design is simple and no major operating difficulties
should be encountered. If the lock is not locking in a
positive enough manner, position the door to verify it is
high enough for the bolt to catch firmly. Side way
movement to the door may also improve lock operation.
Sometimes leveling the freezer will eliminate need for
cabinet door adjustments. Verify freezer is level from
side to side, and from front to back, with a carpenters
level. Adjust leveling glide until freezer is in a true vertical
position.
NOTE: Longer mounting screw must be used to attach
the bottom of door handle.
34
16023585
©2004 Maytag Services
Disassembly Procedures
!
WARNING
To avoid risk of electrical shock, personal injury or
death; disconnect power to unit before following any
disassembly procedures.
Removing Door Lock Assembly
Improving Gasket Seal
1. Remove all inner door liner mounting screws on door
lock side, and four from the top and bottom, working
in from the lock side.
2. Pull inner door liner out far enough to reach the lock
bolt.
3. Using a screw driver pushed through foam block.
Remove screw securing lock cam. Lock cam then
can be removed.
In order for gasket to compress evenly around the entire
door, it must make contact at the top and bottom at the
same time. For this reason the door, should not toe-in or
toe-out.
To correct a toe-in or toe-out condition verify hinge side
of door is parallel to the cabinet.
1. Check cabinet levelers. Turning leveler in or out may
correct a toe-in or toe-out condition.
2. Loosen all inner door panel mounting screws along
the top, bottom, and latch side of the door.
NOTE: Do not loosen screws along hinge side.
4. Remove clip holding lock to outer door panel. Push
lock out of door panel.
5. Reassemble in reverse order.
3. Hold the corner that toes-in stationary; push in on the
toe-out corner until door is lined up parallel with the
cabinet. Tighten a few screws on latch side to hold
door in position.
4. Open and close door several times to insure proper
fit. If necessary, repeat steps 2 and 3.
5. Tighten all loosened screws until they are snug. Do
not tighten screws too much, heads may pull through
screw hole.
Cabinet Door Alignment
Hinge Adjustments
Cabinet door on each model is in correct alignment
when:
• Hinge side of door is equidistant from cabinet flange at
the top and bottom.
• Gasket seals smoothly and is compressed no more
than 1/16 inch (1.6 mm) along the hinge side with door
closed.
• Handle side of door should be 1/16 inch (1.6 mm)
above the handle side of the cabinet (viewed from the
front). Upper hinge side corner of door should be 1/16
inch (1.6 mm) above the cabinet top.
In many cases, leveling the freezer will eliminate needed
for cabinet door adjustments. Verify freezer is level by
checking both front edges as well as both sides of the
cabinet, with a carpenter’s level. Adjust levelers until
cabinet is in a true vertical position.
Hinge adjustments are necessary when:
• Gasket is not sealing sufficiently along hinge side of
door.
• Gasket is compressed more than 1/16 inch (1.6 mm)
on hinge side (causing a poor seal elsewhere around
the door).
• Distance between the door and cabinet is greater at
the top than it is at the bottom, or vice versa.
• Handle side of the door does not line up with cabinet
side (when viewed from the front), or upper latch side
corner is higher or lower than the cabinet top.
If one or more of these conditions exist, verify cabinet is
level and make necessary hinge adjustments as
instructed below.
Turning out the hinge side front leveler may correct a door
sag.
Oversized holes in the cabinet top permit some
sideways, or in and out adjustments of the top hinge.
Raise top hinge by placing a 1/32 inch (0.8 mm) shim
beneath it.
Lower hinge can be moved out by adding a 1/32 inch
(0.8 mm) shim between it and the cabinet.
Checking Gasket Seal
Door gasket seals effectively with its normal pull. Visual
inspection will usually reveal any point of poor seal.
Double check locations which are questionable by
closing the door on a narrow strip of paper. Any areas
that will not support the weight of the paper are
considered areas of poor gasket seal.
On areas which cannot be checked visually or with a
paper, rub blue carpenter’s chalk on the gasket, or
dampen the gasket, and close door several times.
Examine the cabinet flange for transfer of chalk or
dampness. Failure of the transfer indicates areas of poor
seal.
©2004 Maytag Services
16023585
35
Disassembly Procedures
!
To avoid risk of electrical shock, personal injury or
death; disconnect power to unit before following any
disassembly procedures.
WARNING
Cabinet Assembly
Temperature
control knob
Cabinet shell
Light switch
Temperature
control plate
Temperature
control
Light
assembly
Temperature
control knob
Cabinet shell
Temperature
control plate
Light switch
Temperature
control
Light
assembly
Shelve
Cover gasket
Cabinet
inner
liner
Drain tube cap
Drain
tube
and
grommet
Gate brackets
Cabinet
inner
liner
Evaportator
cover
Drain
tube
and
grommet
Gate brackets
Wire gate
Cabinet leveller
Wire gate
Cabinet leveller
36
16023585
©2004 Maytag Services
Service Information
To avoid risk of electrical shock, personal injury or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
! WARNING
System Operation
If freezer is not operating properly and electrical failure is
not ruled out, refer to the electrical system and perform
the necessary electrical tests before making any test
which requires opening the system.
When first opening the door no refrigerant circulating
sound is heard, but after several minutes it is noticeable,
there is probably moisture in the system which is freezing
at the capillary tube outlet. Install a new drier, evacuate,
and recharge.
If there is no electrical failure and system does not
operate properly, such as long run periods or warmer
than normal compartment temperatures, the cause may
be one of the following.
If no moisture is in the system and no leaks, check for
kinked tubing. Sometimes a kink in a large tube will not
affect the system operation. Kink in the capillary tube
could cause erratic operation. It cannot be straightened
without cracking its walls.
Failed Compressor
A compressor which is not pumping adequately will
produce very little cooling effect. The shelf tubing may
be covered with a thin film of frost, but the temperature
will not reach control cut-off level, even with continuous
running.
Incorrect Refrigerant Charge
An overcharged system may have a frost back condition
appearing outside the insulation sleeve on the suction
line at the rear of the cabinet. When the compressor
stops, frost melts and drips on the floor.
Because these conditions are similar to those for a
refrigerant leak, perform leak test. If no leak is found,
install gauges and check the operating pressures. If
high side pressures are lower than those in the table in
the “Specification” section and low side pressures are
higher than specified, the compressor must be replaced.
System must be purged, evacuated, and recharged with
the correct amount of refrigerant.
Restricted Capillary Tube
The inner diameter of a capillary tube is about the same
size as the period at the end of this sentence. It doesn’t
take much to restrict this area. Use care when moving or
touching the capillary tube, slight kink can cause a
restriction.
The system must be purged, evacuated, and recharged
with the correct amount of refrigerant. Before recharging,
test for refrigerant leaks.
Restrictions of capillary tube may be caused by moisture
freeze-up, foreign particles lodged in the tube, or a kink.
If capillary tube is restricted, there will be noticeable lack
of frost on the refrigerated shelves or evaporator. The
compressor will operate for a short time then cycle on
the overload.
Moisture in the System
Any moisture in the system will usually freeze at the
outlet end of the capillary tube, where it enters the
evaporator coil. Preventing refrigerant from entering the
coil. This results in loss of cooling with the compressor
continuously operating. When the evaporator
temperature rises above freezing, moisture restriction
will melt and refrigerant will circulate through the system.
Freezer will operate normally until another freeze-up
occurs, which depends upon the amount of moisture in
the system.
If compressor is operating but evaporator coil or
refrigerated shelves are not refrigerated, stop the
compressor and listen for refrigerant surging through
tubing. If a “gurgling” sound is heard, capillary tube is not
restricted. Check for a leak or check operating
pressures.
©2004 Maytag Services
16023585
An undercharged system will operate with temperatures
above normal and compressor operating time will be
increased. The greater the undercharge, higher the
temperatures and longer the operating time.
Partial Restriction in Low Side Tubing
Bent tubing, foreign matter, or moisture in the system,
may cause a partial restriction in the low side tubing.
This usually results in frost-free tubing between the
restriction and capillary tube and frost-covered tubing
between the restriction and suction line. This restrictions
acts like a second capillary tube, increasing pressure
behind it (warming) and decreasing pressure beyond it
(cooling). Replace component if there is a partial
restriction in the refrigerant tubing.
Pressure Unloading in System
Compressor may stall and cycle on overload if an
attempt is made to restart unit immediately after it has
stopped. Compressor is trying to start while refrigerant
pressure is high on condenser side and low on
evaporator side. When the compressor stops operating,
pressure in both sides equalizes as the liquid slowly
passes through the capillary tube. When this occurs the
pressures are said to be “unloaded”. Pressure unloading
in the system will usually take from 3 to 6 minutes.
Pull Down Over Load
If cabinet interior is warm when compressor starts, “pull
down” may overheat the compressor and cause cycling
on the overload protector.
37
Service Information
To avoid risk of electrical shock, personal injury or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
! WARNING
Checking Operating Pressures
High Side—much higher pressure
If refrigeration system is not operating properly, check
operating pressures.
Low Side—slightly lower pressure
Install a piercing valve on compressor process tube and
on high side process tube.
Indicates a leak in the low side of the system. High side
pressures will continually increase drawing through the
leak becoming trapped in the high side tubing. Low side
gauge will show a slight pressure being drawn in through
the leak.
NOTE: Piercing valve should not be left on the tubing
after tests are complete. Remove the valve from
discharge line and repair the opening. Evacuate
and recharge the system.
Wattage—higher than normal
When using gauges to verify operating pressures,
observe the following precautions.
High Side—lower pressure
1. Verify gauges are accurately calibrated. When not
connected into a system, gauge pointers should
indicate 0 pressure. If necessary, turn the
recalibrating screw on the dial until the pointer
indicates 0.
2. Verify temperature control is set to normally maintain
a 0°F (-17°C) temperature.
3. Remove all unfrozen food from the freezer.
4. Before taking final gauge readings, allow freezer to
run through several cycles with the door closed. This
will allow the temperature and pressures to stabilize.
5. Compare the final gauge readings for the model
being serviced, see the category which applies to the
readings indicated.
Wattage—lower than normal
Indicates restriction at the entrance of the capillary tube.
High side pressures will take much longer than the
prescribed seven to ten minutes to unload and balance
with the low side after compressor has stopped.
High Side—higher pressure
Low Side—higher pressure
Wattage—higher than normal
Indicates an overcharge of refrigerant. Pressure
increasing depends on the amount of overcharge and
room temperature.
A slight overcharge may not cause trouble in 70°F (21°C)
temperatures, where as in 90°F (32°C) temperatures a
considerable rise in pressure will result.
High Side—near normal pressure
Low Side—lower pressure (possible vacuum)
Wattage—lower than normal
Freezer shelf tubing or other low side tubing is probably
restricted (kinked or blocked with foreign particle). This
condition is usually accompanied with a frost build-up on
the low side of the restriction. High side pressures will
not unload and balance with the low side within the
prescribed seven to ten minutes after the compressor is
stopped.
An overcharge may also cause the suction line under the
cabinet to be frosted during the run cycle. This condition
will confirm the existence of an overcharge.
High Side—higher pressure
Low Side—near normal pressure
Wattage—higher than normal
Indicates air in the system. Resulting from a low side
leak being repaired without the system being thoroughly
evacuated and purged before recharging.
High Side—low pressure
Low Side—lower pressure (possible vacuum)
Wattage—lower than normal
Indicates a leak in the high side of the system. Both
gauges will show progressively less pressure.
38
Low Side—lower pressure (possible vacuum)
16023585
In most cases, you will find that the freezer is not as cold
as it should be, because the efficiency of the system is
greatly reduced by the presence of air.
Simply purging air from the system is not practical. The
system being undercharged due to the loss of
refrigerant. Evacuate, purge, and recharge the system
©2004 Maytag Services
Service Information
To avoid risk of electrical shock, personal injury or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
! WARNING
Operational Testing
Thorough operational checking of freezer will minimize
future service calls.
1. Set control to No. 4 position.
2. Place thermometer in the center of the freezer.
Operating temperatures should cycle between +3°F
(cut in) to -2°F (cut out) in an empty cabinet.
3. Check thoroughly with reliable leak detector for leaks.
4. Attach a cycle recorder and plug into outlet. Verify
power source is not overloaded with other
appliances.
Compare test results with "Performance Data" table, see
"Component Testing" section.
Running time will vary according to design characteristics
of the system and will be influenced by conditions listed
below:
•
•
•
•
Temperature control setting
Room temperature
Length of time and number of lid openings
Quantity and temperature of food placed in freezer
Service Hints
Owner's Manual
If you find customer is not familiar with "Owner's
Manual", acquaint customer with manual.
Usage
Common types of abnormal usage that may lead to
service calls include the following:
1. Excessive unfrozen food load:
• Amount of unfrozen food to be placed in freezer
should not exceed approximately 3 pounds per
cubic foot in 24 hours, unless otherwise noted.
• Recommend to customer that larger quantities of
food be frozen commercially before placing in
freezer.
• Larger unfrozen food loads may cause customer
complaints of "continuous running" or may raise
temperature of frozen food. Larger unfrozen food
loads may also result in longer freezing times.
2. Excessive Lid Opening:
• Freezer is not designed to be operated as a
refrigerator. Length of time and number of lid
openings should be kept to minimum.
©2004 Maytag Services
16023585
Compressor "On" And "Off" Periods
Variations in compressor cycles per hour are affected by
factors such as usage, ambient conditions, electric
power supply and others. Compressor off period is at
least 8 minutes. Tripping on overload may occur.
Noise
Some noise, especially during starting and stopping of
compressor, is normal. In some cases noise, described
by customer as "gurgling," is experienced. This "gurgling"
noise is caused by liquid entering evaporator.
Voids In Urethane Foam Insulation
• Some condensation occurs on outer casing of freezer,
when humidity is 85% or higher, which is considered
normal.
• If condensation occurs at lower humidity level or
persistently causes dripping water, there may be a
void in the foam insulation where condensation
occurs. Theoretically, voids can occur in any part of
the freezer insulation.
1. Diagnosing presence of a void:
a. Freezer should be operating and food-liner
temperature should be close to 0°F.
b. Disconnect power supply to freezer and wait 10
minutes. This will allow condenser and skin of
outer casing to cool down to room temperature.
c. Move your palm around skin of outer casing,
searching for cold spots.
• If a void exists, area will feel colder than
neighboring area. To access that "cold spot" is
a void, try to flex sheet metal with your thumb.
Metal over a void will be more flexible than
metal backed with foam.
• If no void is found, observed condensation or
dripping, which is caused by insulation void on
the food-liner side of the foam insulation.
2. Action to be taken:
• If void is in an area which can be repaired in the
field (bottom or back) using the "foam kit",
proceed with the repair. If void is found in an area
which is exposed to view, then freezer should be
returned to source.
39
Service Information
To avoid risk of electrical shock, personal injury or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
! WARNING
Refrigeration System Complaints
Common occasions for customer requesting service are
listed below with possible reasons and tests to diagnose
problem before replacements are made.
1. Cabinet temperature does not come down:
a. Refrigerant charge is low. Examine frost line at tail
end of the evaporator.
b. Compressor is inoperative (see compressor
sections).
c. Control has been turned to "OFF" position.
d. Freeze-up
2. Compressor will not start:
a. Lack of power. Verify power availability at
compressor terminals.
b. Starting relay has failed. Connecting starting relay
contacts L & S for 1 second should result in a
normal start. Replace starting relay.
c. Overload protector has failed in open position.
Replace overload.
d. One of compressor windings is open. Check
winding resistances. Resistance between CDS
and CDR should be less than 100 ohms.
e. Compressor is locked (seized). If voltage is
normal, there is no failure in the relay protector or
any connections leading to the compressor
terminals, and the amperage drawn is high.
Compressor has failed.
3. Compressor overload thermostat is operating
frequently but cabinet temperature has not risen
noticeably.
a. Voltage under 10 VAC.
b. Voltage over 127 VAC.
c. Lid is being opened frequently so compressor
"OFF" time is too short for pressure equalization.
d. Installation condition is causing compressor to run
hotter than usual (for example, lack of air
circulation around freezer shell).
e. Overload thermostat has failed.
40
16023585
4. Continuous running:
a. Freezer has been filled with unfrozen or warm
food.
b. 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
5. Compressor runs too long:
• This is usually a statement of opinion by
customer. For a normal storage temperature at
0°F, expected running times are shown in
"Performance Data" table, see "Component
Testing" section.
• Running times can vary substantially depending
on usage and conditions.
6. Freeze-up:
Moisture freezing in the sealed system is extremely
rare; however, it may be encountered when sealed
system is opened for service.
a. Moisture freeze-up is indicated by continuous
running and high cabinet temperatures. Use a
suction pressure gauge to diagnose problem. As
freezer pulls down, back pressure drops to a
vacuum. By pulling freezer plug and warming
cabinet until evaporate exceeds 0°C the ice will
melt and cause a rapid rise in pressure. This can
be duplicated any number of times.
b. Freeze-up can only be corrected by evacuating
system with a vacuum pump, and by installing a
new, oversized, high side drier.
NOTE: Effective July 1, 1992, it is responsibility of
service technician to capture refrigerant for safe
disposal.
c. In case of freeze-ups, the unit's current draw
(amperage) will usually be low, about 70 percent
of serial plate.
©2004 Maytag Services
Service Information
To avoid risk of electrical shock, personal injury or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
! WARNING
nozzle of detector on every joint for at least 1 minute.
If no leak can be found at these joints, check for
internal leak.
Refrigerant Leaks
!
DANGER
Free oxygen will explode on contact with oil. Acetylene
will explode spontaneously when put under pressure.
Finding Internal Leak
Confirm existence of an internal leak by pressure testing.
To prevent violent explosions that may result in
serious injury or death to persons in or near the
immediate vicinity, NEVER use oxygen or acetylene
for pressure testing or cleanout of refrigeration
systems.
NOTE: For this test, evaporator and condenser must be
disconnected and individually pressure tested
with dry air or dry nitrogen at pressures between
200–300 psi.
Before attempting to locate a leak, study the diagrams
showing the route of refrigeration tubing and serviceable
joints.
NOTE: Urethane foam cells are filled with trapped gas
and if cells are broken (by removing a piece of
foam, etc.) a leak detector will indicate a strong
leak. When foam cells are broken, liberated gas
should be blown off surface or allow unit to
stand for at least 5 minutes before testing.
Symptoms of refrigerant leaks
1. Frost-line, visible inside food-liner, does not extend to
tail-end of evaporator. In properly refrigerated system
frost-line, on the food-liner back wall of the chest
freezer, will extend down to 5–6 inches from the foodliner bottom. In slow leaks, this frost-line gradually
recedes upward.
When an internal refrigerant leak is suspected,
recharge freezer with proper amount of refrigerant
and mark end of the frost-line (nearest spot to the
bottom) with a crayon. Leave freezer running
(sometimes for months) and observe mark
periodically. If frost-line moves away from mark, a
leak (external or internal) is certain.
2. Feeler bulb of thermostat, is located toward tail-end of
evaporator. In case of shortage in refrigerant, tail-end
of evaporator will not be refrigerated and thermostat
will not cut out causing freezer to run continuously.
(This can be confused with a faulty thermostat.)
3. Although compressor is running continuously, foodliner temperature will rise.
4. Low suction pressures.
External Or Internal Leak
• "Internal leaks" are refrigerant leaks inside foam
insulation. All other leaks are considered "external".
• Once presence of a leak has been determined (from
symptoms described above), locate leak.
• First, test all joints in compressor compartment. Hold
©2004 Maytag Services
16023585
Leave the components under pressure for a minimum of
3 days. If after 3 days, pressure drop is more than 10
psig, at approximately same room temperature,
presence of an internal leak can be assumed.
• Be sure there are no leaks in connections between
pressurizing device and gauge or between gauge and
cabinet. A leak at these joints could be misinterpreted
as an internal leak.
• Apply soap solution to all joints and connections to
check for leaks (bubbles).
• If pressure drop after 3 days is not more than 10 psig,
there is no internal leak.
Pressure test described above will indicate:
• leaking condenser; or
• leaking evaporator; or
• no leak.
Condenser 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.
Evaporator Leak (Internal)
If pressure test indicates leak in the evaporator, the leak
could be:
• at the evaporator/suction line; or
• at the evaporator inlet joints, or
• at an unknown location.
Joint is located approximately 2–4 inches below breaker
strip at back left corner. After breaker strip has been
removed, carefully search for capillary by gradually
removing foam insulation.
Evaporator inlet can be lifted above cabinet flange for
examination and repair. After leak has been repaired,
repack void with fiberglass insulation.
NOTE: Removal of breaker strip will destroy it. Replace
breaker strip with new one.
If evaporator leak is at unknown location, contact factory
for permission to replace unit if product is under
warranty.
41
Service Information
To avoid risk of electrical shock, personal injury or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
! WARNING
Evacuation and Charging Procedures
!
WARNING
Sealed system on these freezer models use R134a refrigerant. If sealed system work on these models is required,
used approved equipment and follow service procedures. See HFC134a Service Information section of this
manual for service procedures.
!
CAUTION
To minimize contamination, exercise extreme care when servicing HFC134a sealed systems.
• No trace of other refrigerants is allowed in HFC134a systems. Chlorinated molecules in other refrigerants
such as CFC12, etc. 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 are 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.
• Low-side leak repairs of HFC134a systems are different from those of CFC-12 systems. 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 from 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 always be replaced when performing low side leak repair.
• Drier filter must be replaced whenever seal system is opened.
Important: Unbrazing drier filter from tubing will drive 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.
• Clean, dry HFC134a compatible copper tubing must be used when replacing tubing.
• Avoid system contamination by using Towerdraw E610 evaporating oil, when flaring, swaging, or cutting
refrigeration tubing.
42
16023585
©2004 Maytag Services
Service Information
To avoid risk of electrical shock, personal injury or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
! WARNING
Comparison of CFC12 and HFC134a:
HFC134a Service Information
HFC134a Refrigerant
HFC134a is alternative refrigerant for CFC12. HFC134a
has an ozone depletion potential (ODP) factor of 0.0 and
a global warming potential (GWP) 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
Liquid exposure to skin
Vapor exposure to eye
Liquid exposure to eye
Above minimum exposure limit
Safety and handling
Spill management
Fire and explosion hazards
Storage conditions
Disposal procedures
©2004 Maytag Services
Properties/Characteristics
Ozone Depletion Potential (ODP)
Global Warming Potential (GPW)
Molecular weight
Boiling point at 1 atmosphere
Vapor pressure at 77°F (25°C)
Liquid density at 77°F (25°C)
Flammability
High-side system operating
Pressure at 65°F (18°C) ambient
Low-side system operating
Pressure at 65°F (18°C) ambient
* Compared to CFC 11 = 1
CFC12
1,000 ppm
No effect
Can cause frostbite
Very slight irritant
Can cause frostbite
Can cause Asphyxiation,
Tachycardis, and Cardia
Arrhythmias
Wear appropriate skin
and eye protection. Use
with adequate
ventilation.
Remove or extinguish
ignition or combustion
sources. Evacuate or
ventilate area.
May decompose if
contact with flames and
heating elements.
Container may explode if
heated due to resulting
pressure rise.
Combustion products are
toxic.
Procedures/rules for
CFC12 also apply for
HFC134a.
Recycle or reclaim
16023585
CFC12
HFC134a
1.0*
0.0*
3.2*
0.27*
121
102
-22°F (-30°C) -15°F (-26°C)
80 psig
82 psig
82 lb/ft3
75 lb/ft3
No
No
HFC134a approximately 3 psig
higher than CFC12
HFC134a approximately 2 psig
lower than CFC12
HFC134a
Same
Same
Same
Same
Same
Same
Same
Same
Same
Same
43
Service Information
To avoid risk of electrical shock, personal injury or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
! WARNING
Service Equipment
!
Drier Replacement
Before opening sealed system, recover HFC134a
refrigerant for safe disposal.
CAUTION
Service equipment for HFC134a systems must be
used exclusively with HFC134a refrigerant. Do not use
this equipment to service devices using other types of
refrigerant (for example, CFC12 or CFC22
refrigerants).
Listed below are the tools and equipment needed for
proper servicing of HFC134a systems.
NOTE: Once equipment is designated for HFC134a
use, it must be exclusively use for HFC134a
only. An * will identify the following equipment.
• * Evacuation pump Check with vacuum pump
supplier to verify equipment is compatible for
HFC134a. Robinair, Model 15600, 2 stage, 170 liters
(6 cubic feet) per minute pump is recommended.
• * Four-way manifold gauge set with low loss quick
couplers
• Leak detector
• * Charging cylinder
• * Line piercing saddle valve 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. Valves eventually will leak.
Molecules of HFC134a are smaller than other
refrigerants and will leak where other refrigerants
would not.
• * Swaging tools
• * Flaring tools
• * Tubing cutter
• Flux
• Sil-Fos
• Silver solder
• * Oil for swaging and flaring
• * Copper tubing
• 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
44
16023585
Every time sealed HFC134a system is repaired, drier
filter must be replaced. Cut drier out of system by
completing the following steps. Do not unbraze drier
filter. Applying heat to remove drier will allow moisture
into system.
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 1-1/4" (3.175 cm), below
condenser inlet tube joint to drier.
4. Remove drier.
5. Unbraze remaining part of drier. Remove drier from
system.
6. Discard drier in safe place. Do not leave drier with
customer.
©2004 Maytag Services
Service Information
To avoid risk of electrical shock, personal injury or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
! WARNING
!
WARNING
To avoid death or severe personal injury, cut drier at
correct location. Cutting drier at incorrect location will
allow desiccant beads to scatter. Completely clean
area of beads, if spilled.
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.
Refrigerant Charge
Replacement HFC134a Service Compressor
HFC134a service compressors are charged with ester oil
and pressurized with dry nitrogen. Before replacement
compressor is installed, pull out one 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.
The holding charge assures the compressor is dry. A
compressor, it is recommended that the tubes be cut
close to the soldered joints where they are connected to
the compressor tube. If the tubes are not long enough, it
may be necessary to unsolder the joints to allow
connections to the replacement compressor. When
replacing compressor, proceed as follows:
1.
2.
3.
4.
Disconnect power cord from electrical outlet.
Install a service valve on process tube.
Connect a hose to service valve and capture charge.
Clean the tubing for about 3 inches (76 mm) at the
points to be cut. Before cutting tube, be sure it will be
long enough to reconnect to replacement
compressor. If not, unbraze joints.
5. Disconnect wires from compressor terminals.
6. Remove retaining clips from compressor mounts. Lift
compressor from mounting rails and transfer rubber
grommets to replacement compressor.
7. Set replacement compressor into position and install
retaining clips.
8. Remove all rubber plugs. Clean stubs of compressor
and compare the size of tubing to stubs of
replacement compressor. It may be necessary to
swag copper tubing to make the joints.
9. Install a 6 inch (152 mm) copper tube to low side
process tube on compressor. Add a service valve to
end of this tube.
10.Connect all tubing. Apply flux to compressor stubs
and braze all the joints. Flux must be wiped off after
brazing.
11. Install a new drier.
©2004 Maytag Services
16023585
Refrigerant charge in all capillary tube systems is critical
and exact amount is required for proper performance.
Factory charges are shown on serial plate. Do not use
refrigerant other than shown on serial plate.
Leak Testing
Undetected leaks lead to repeated service calls and
eventually result in system contaminations, restrictions,
and burned out compressors.
After recharging, sealed system must be thoroughly
tested for leaks. If a very small leak is difficult to isolate,
coat area with soap suds and observe. Bubbles will form
in location of leak.
Evacuation and Charging
!
DANGER
Free oxygen will explode on contact with oil. Acetylene
will explode spontaneously when put under pressure.
To prevent violent explosions that may result in
serious injury or death to persons in or near the
immediate vicinity, NEVER use oxygen or acetylene
for pressure testing or cleanout of refrigeration
systems.
!
WARNING
To avoid severe personal injury or death from fire
keep system free from contamination due to presence
of air. Follow instructions exactly.
!
WARNING
To reduce risk of fire, sealed refrigeration system
must be air free. To reduce risk of air contamination
follow evacuation procedures exactly.
45
Service Information
To avoid risk of electrical shock, personal injury or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
! WARNING
Thermistor
Vacuum Gauge
Low Side Gauge
E
Valve
High Side Gauge
D
Valve
C
Compressor
Charging Hose
Compressor
Process
Tube
Drier/Process Tube
Charging Hose
B
A
.6 cm Copper
Tubing
F
Valve
Vacuum Pump
Charging
Cylinder
Evacuation and Charging
Typical Setup
Before opening system, evaporator coil must be at
ambient temperature to minimize moisture infiltration into
system.
NOTE: It is the responsibility of the service technician to
capture refrigerant in system for safe disposal,
before opening any refrigeration system.
1. After capturing refrigerant, replacing drier and making
any repairs, evacuate system from high side through
drier/process tube and low side through compressor
process tube simultaneously. Evacuation should not
be done through line piercing valve but through I.D.
opening of tubes.
2. With valves “C” and “F” closed to thermistor vacuum
gauge and charging cylinder, open all other valves
and start vacuum pump.
3. At approximately 77.66 cm (29") of vacuum, open
valve “C” to thermistor vacuum gauge and take
micron reading.
4. Continue evacuating system until thermistor vacuum
gauge registers 600 microns.
5. At 600 microns close valve “A” to vacuum pump to
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 for charging.
• If micron rises above 1000 micron level and
stabilizes, open valve “A” to vacuum pump and
continue evacuating.
46
16023585
• If micron reading rises rapidly and does not
stabilize, a leak still exists in system. Close valve
“A” to vacuum pump and “C” to thermistor 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. After locating
leak, capture refrigerant charge, repair leak, and
begin at step 1.
6. Once system is ready to charge, close valve “A”
(vacuum pump), “C” (thermistor vacuum gauge), and
“E” (low side manifold gauge).
7. Check serial plate for correct charge and set scale on
dial-a-charge cylinder for corresponding HFC134a
pressure reading.
NOTE: Do not use captured or recycled refrigerant in
units. Captured or recycled refrigerant voids any
compressor manufacture's warranty.
8. Open valve “F” to charging cylinder and let exact
amount of refrigerant out of cylinder. 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.
9. If no restriction exists, open valve “E” (low side
manifold gauge) and pinch off high side drier process
tube.
10.Start compressor and draw remaining refrigerant in
charging hoses and manifold into compressor
through compressor process tube. To check high
side pinch-off drier process tube, close valve “D”
(high side gauge). If pinch-off is not leaking, high side
pressure will not rise. If high side pressure gauge
shows an increase, repeat high side pinch-off and
open valve “D”. Repeat until high side pinch-off no
longer leaks.
11. Pinch-off compressor process tube and remove
charging hose. Braze stub closed while compressor
is operating.
12.Unplug dehumidifier from electrical outlet. Remove
charging hose and braze high side drier process tube
closed.
©2004 Maytag Services
Service Information
To avoid risk of electrical shock, personal injury or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
! WARNING
Dehydrating Sealed Refrigeration System
It is a misconception that moisture in a sealed refrigerant
system is harmless. Moisture in a sealed refrigerant
system, when 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 the
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 in the sealed system, and will
eventually restrict refrigerant flow through the capillary
tube.
To dehydrate the sealed system:
30% silver, 38% copper, 32% zinc). Use with fluoride
based flux. Recommended brazing temperature is
approximately 1200°F.
• Steel to steel joints: SILVER SOLDER (see above).
• Brass to copper joints: SILVER SOLDER (see
copper to steel connections).
• Brass to steel joints: SILVER SOLDER (see copper
to steel connections).
Refrigerant Precautions
!
WARNING
To avoid personal injury do not allow refrigerant to
contact eyes or skin. Do not burn refrigerant.
1. Perform the leak test.
2. Capture refrigerant in system.
NOTE: It is the responsibility of the service technician to
capture refrigerant in system for safe disposal,
before opening any refrigeration system.
3. Repair any leaks in system.
4. Evacuate system.
5. Recharge to specification with new refrigerant.
NOTE: Do not use captured or recycled refrigerant in
units. Captured or recycled refrigerant voids any
compressor manufacturers warranty.
!
CAUTION
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.
Open Lines
During any processing of refrigeration system, never
leave lines open to the atmosphere. Open lines allow
water vapor to enter system, making proper evacuation
more difficult.
Brazing
!
CAUTION
Brazing requires high temperatures. Take all
necessary precautions to protect against personal
injury and property damage.
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%
silver, 80% copper, and 5% 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
©2004 Maytag Services
16023585
47
Service Information
To avoid risk of electrical shock, personal injury or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
! WARNING
Line Piercing Valves
Line piercing valves may be used for diagnosis, but are
not suitable for evacuating or charging due to the minute
holes pierced in the tubing.
!
WARNING
Line piercing valve should not be left on the system,
connection to tubing is not hermetically sealed and
eventually a leak will occur.
Upright freezers which are insulated with foamed-in
polyurethane foam have their condenser tubing
embedded in this foamed insulation within the cabinet
wall. Liner cannot be removed and there is no access to
the tubing to removed, repaired, or replaced.
NOTE: Polyurethane insulation contains refrigerant
R–11/R141B/R22. Care must be taken when
testing. Isolate the area as much as possible so
that the leak detector will not falsely indicate a
leak of R–11/R141B/R22 vapor.
has a positive pressure. Using it where a vacuum
is present could pull moisture or soap bubbles
into the system.
Brush liquid detergent over testing area and watch for
bubbles. This may take a few minutes for a bubble to
appear if leaks are extremely small.
After replacing a component always evacuate, add
refrigerant, and test for leaks on all joints before
recharging. Clean excess soldering flux from new joints
before testing to prevent pinhole leaks at a later time.
Altitude Adjustment
All models covered in this manual are equipped with a
Cutler Hammer temperature control. It has two
adjustment screws, both of which must be turned to
compensate for variance in altitude. Screw turns are very
critical, use circular scale as a guide.
If there is an undercharge of refrigerant and the system
has not been recently opened, there is probably a leak in
the system. First locate and repair the leak. Evacuate and
recharge with the proper amount of refrigerant. Replace
the dryer whenever a new charge of refrigerant is added.
Cut-out screw
Cut-in screw
NOTE: Effective July 1, 1992, before opening any
refrigeration system it is the responsibility of the
service technician to capture the refrigerant for
safe disposal.
Presence of oil around a tubing joint usually indicates a
leak. Always use a leak detector to determine if the joint
is leaking.
Pressurize the system to a minimum of 75 PSIG, by
running the compressor for high side testing. To
pressurise the low side, allow entire system to warm up
to room temperature.
If pressure is low enough a leak test will be impossible to
perform. Install a service valve to compressor process
tube and check pressure. Recover remaining
refrigerant. Separate and pressurize high & low side
independently, allowing unit to settle.Check gauges for
pressure drop.
Leak detector can insolate larger leaks and generally
locate small ones, but to actually pinpoint extremely
small leaks in the high side, soap bubble solution will
need to be performed.
NOTE: Use soap bubble solution only when the system
48
16023585
Temperature Control
Alititude
in feet
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
Counter Clockwise
turns
7 / 60
13 / 60
19 / 60
25 / 60
31 / 60
37 / 60
43 / 60
49 / 60
55 / 60
05
00
55
10
50
45
15
20
40
25
30
35
Altitude Correction Both “Cut-In” and
“Cut-Out” Screws Must Be Adjusted
This scale may be used as a guide for measuring
degrees of rotation required for altitude correction. The
arrows indicate direction of screw rotation 1/60 of a turn
equals 6° of rotation.
Turn cut-in or cut-out screws clockwise to obtain colder
operating temperatures.
©2004 Maytag Services
Service Information
To avoid risk of electrical shock, personal injury or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
! WARNING
Cabinet Shell
Cabinet shell is made of steel, with all seams welded and
all points of stress adequately braced.
Refrigeration system condenser tubes are attached to the
inner surfaces of the cabinet shell by means of spot
welded clamps. Forming a shell-type condenser which
provides quiet operation and efficient heat dissipation.
This method of dissipating the condenser heat eliminates
the formation of condensation on exterior surfaces of the
cabinet.
Steel base rails provide a platform on which the cabinet
shell is mounted. Two adjustable levelling glides are
inserted into the base rails, one at each front corner.
Door lock retainer and strike are also attached to the
cabinet shell (if equipped).
Cabinet Liner (Food)
Cabinet liner is made of a tough, flexible, plastic or high
impact polystyrene material and is secured to the cabinet
shell with retaining clips.
Following components are attached to the cabinet liner
by utilising special snap nuts, clips and other fasteners;
interior light and switch, cold control assembly and cover,
evaporator coil and cover (no-frost models), shelves and
gate mounting hardware, and drain tube and grommet.
Drain System Refrigerated Shelf Models
On no-defrost models, drain grommet and sleeve are
located in the center of drain trough which has been
formed in the cabinet liner. During defrost cycle, water is
carried through the drain hose and tube into the moisture
pan which is located under the cabinet. Heat from the
precooler condenser hastens the evaporation process.
Once system components and cabinet liner have been
assembled to the cabinet shell, polyurethane insulation is
“foamed in” to fill the void between the shell and liner.
NOTE: Cabinet (food) liner cannot be removed on the
current models with foam insulation.
Drain System
Freezer drain system consists of a drain grommet and
sleeve at the liner and cabinet bottom, and a drain hose
and tube that carries the defrost water.
NOTE: Refrigerated shelf models are equipped with a
drain cap that must be removed before
defrosting and replaced securely afterwards.
On refrigerated shelf models, defrost water is carried
through the front face plate of the cabinet where it can be
collected into a container for disposal.
Drain System No-Defrost Models
Drain tube grommets should never need replacing
unless it has deteriorated.
If drain system becomes clogged, push a length of
plastic cloths line completely through and flush with
warm water.
©2004 Maytag Services
16023585
49
Wiring Diagram and Schematic
!
WARNING
To avoid risk of electrical shock, personal injury, or death, disconnect power to freezer before servicing, unless
testing requires it. Wires removed during disassembly must be replaced on proper terminals to insure correct
grounding and polarization.
!
CAUTION
High Voltage
Ground
Light Plate (ground)
Black
Black
White
To 115 VAC plug
Black
Light
Black
Light Switch
Red
Black
Light
switch
White
White
Interior
light
Black
Control
Control
Overload
protector
Red
Compressor
R
C
S
PTC
relay
Capacitor
Green
Black
Service Cord
Ground
Ground schematic
Red
Black
Red
Capacitor
1 - Outer case
2 - Compressor
3 - Control
4 - Light plate
White
Compressor
Green
No Interior Light (Optional)
Manual Defrost Models
AFU1202BW
AFU1705BW
AFU1505BW
AFU2005BW
AQU1525AEW
MQU2056ARW
MQU1554AEW
MQU2057AEW
MQU1556AEW
50
16023585
©2004 Maytag Services
Wiring Diagram and Schematic
!
WARNING
To avoid risk of electrical shock, personal injury, or death, disconnect power to freezer before servicing, unless
testing requires it. Wires removed during disassembly must be replaced on proper terminals to insure correct
grounding and polarization.
!
CAUTION
SCHEMATIC
High Voltage
BLACK
WHITE
BLACK
DOOR
SWITCH
BLACK
LAMP- REFRIGERATOR CABINET
DEFROST
TIMER
4
BLACK
34.6/37.5 OHMS
2
YELLOW
COLD
CONTROL
1
ORANGE
WHITE
DEFROST
HEATER
DEFROST
THERMOSTAT
WHITE
BLUE
4000
OHMS
RED
WHITE
WHITE
3
112.4 OHMS
WHITE
EVAPORATOR
FAN MOTOR
RED
COMPRESSOR
OVERLOAD
PROTECTOR
WHITE
BLACK
RED
RELAY
C
R
RUN
START
2
3
WHITE
S
CAPACITOR
LH/LV
BLACK
LN
IDENTIFIED CONDUCTOR
GREEN
POWER
SUPPLY
Compressor
1
2
1 - Outer Case
2 - Compressor
3 - Control
4 - Light Plate
5 - Fan Motor
6- Coil Cover
GROUND
Coil Cover
6
Control
Light Plate
3
4
Fan Motor
5
Outer Case
Frost Free Models
AFU1567BW
©2004 Maytag Services
AFU1767BW
16023585
AFU2067BW
51