Amana 22 Cu. Ft, Service Manual

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Component Testing
!
WARNING
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test
procedures require power to be connected. Discharge capacitor through a resistor before attempting to service.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
RS1300005 Rev. 0 8
Component Description Test Procedures
Refrigerator light
switch Single pole, single throw switch
completes circuit for light when door is
open. Check resistant across terminals.
Switch arm depressed
“NO” terminals Open
Switch arm up
“NO” terminals Closed
Freezer light /
Interlock switch Single pole, Double throw switch
completes circuit for light when door is
open. Completes circuit for dispenser
when door is closed Check resistant across terminals.
Switch arm depressed
“NO” terminals Open
”NC” terminals Closed
Switch arm not depressed
“NC” terminals
Open
“NO” terminals Closed
Drier Drier is placed at post condenser loop
outlet and passes liquefied refrigerant to
capillary.
Desiccant (20) 8 x 12 4AXH - 7 M>S> -
Grams
Drier must be changed every time the system is opened for testing or
compressor replacement.
NOTE: Drier used in R12 sealed system is not interchangeable with
drier used in R134a sealed system. Always replace drier in R134a
system with Amana part number B2150504.
Before opening refrigeration system, recover HFC134a refrigerant for safe
disposal.
1. Cut drier out of system using the following procedure. Do not unbraze drier.
2. Applying heat to remove drier will drive moisture into the system.
3. Score capillary tube close to drier and break.
4. Reform inlet tube to drier allowing enough space for large tube cutter.
5. Cut circumference of drier 1 ¼" below condenser inlet tube joint to drier.
6. Remove drier.
7. Apply heat trap paste on post condenser tubes to protect grommets from high
heat.
8. Unbraze remaining part of drier. Remove drier from system.
9. Discard drier in safe place. Do not leave drier with customer. If refrigerator is
under warranty, old drier must accompany warranty claim.
Defrost timer Timer motor operates only when freezer
control is closed.
After specified amount of actual
operating time, inner cam in timer throws
the contacts from terminal 4, compressor
circuit, to terminal 2, defrost
thermostat/defrost heater circuit.
After specified defrost cycle time, timer
cam resets the circuitry through terminal
4 to compressor.
1. To check timer motor winding, check for continuity between terminals 1 and 3
of timer.
2. Depending on rotating position of the cam, terminal 1 of timer is common to
both terminal 2, the defrost mode, and terminal 4, the compressor mode.
There should never be continuity between terminals 2 and 4.
3. With continuity between terminals 1 and 4, rotate timer knob clockwise until
audible click is heard. When the click is heard, reading between terminals 1
and 4 should be infinite and there should be continuity between terminals 1
and 2.
4. Continuing to rotate time knob until a second click is heard should restore
circuit between terminals 1 and 4.
Adaptive defrost
control (ADC) The ADC adapts the compressor run
time between defrosts to achieve
optimum defrost intervals by monitoring
the cold control and length the defrost
heater is on. Refer to specific Technical Data Sheet with unit for troubleshooting procedure.
WARNING
!
To avoid death or severe personal injury, cut drier at correct location.
Cutting drier at incorrect location will allow desiccant beads to scatter. If
spilled, completely clean area of beads.