Amana 18 Cu. Ft Service page 9

Component Testing
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.
Component Description
Valve, water Controls water flow to the ice maker.
Controlled by thermostat in ice maker.
See Ice Maker Section for further
information.
Evaporator Inner volume of evaporator allows liquid
refrigerant discharged from capillary to
expand into refrigerant gas.
Expansion cools evaporator tube and fin
temperature to approximately -20
transferring heat from freezer section to
refrigerant.
Passing through suction line to
compressor, the refrigerant picks up
superheat (a relationship between
pressure and temperature that assures
complete vaporization of liquid
refrigerant) as the result of capillary tube
soldered to suction line.
Refrigerant gas is pulled through suction
line by compressor, completing
refrigeration cycle.
Heater, evaporator Activated when defrost thermostat,
(defrost) defrost timer, and freezer control
complete circuit through heater.
Thermostat Thermostat is in a series circuit with
terminal 2 of defrost timer, and defrost
heater. Circuit is complete if evaporator
fan motor operates when cold.
Controls the circuit from freezer
thermostat through defrost terminator to
defrost heater. Opens and breaks circuit
when thermostat senses preset high
temperature.
Damper Control Damper control balances the air delivery
between refrigerator and freezer
compartments providing temperature
control for refrigerator.
Internal capillary activates damper
control and door closes restricting flow of
air from freezer compartment to
refrigerator compartment.
!
WARNING
Test Procedures
Check resistance across coil windings.
Test for leaks in evaporator with electronic leak detector or with soap solution.
Compressor oil is circulated with refrigerant; check for oil when checking for
leaks.
For minute leaks
1. Separate evaporator from rest of refrigeration system and pressurize
F
°
evaporator up to a maximum of 140 PSI with a refrigerant and dry nitrogen
combination.
2. Recheck for leaks.
To avoid severe personal injury or death from sudden erruption of
high pressurres gases, observe the following:
•
Protect against a sudden eruption if high pressures are required
for leak checking.
•
Do not use high pressure compressed gases in refrigeration
systems without a reliable pressure regulator and pressure relief
valve in the lines.
Check resistance across heater.
To check defrost system :
1. Thermocouple defrost thermostat and plug refrigerator into wattmeter.
2. Turn into defrost mode. Wattmeter should read specified watts (according to
Technical Data Sheet).
3. When defrost thermostat reaches specified temperature
Data Sheet), thermostat should interrupt power to heater.
Test continuity across terminals.
With power off and evaporator coil below freezing, thermostat should show
continuity when checked with ohmmeter. See "Heater, evaporator (defrost)"
section for additional tests.
After defrost thermostat opens, thermostat remains open until end of defrost
cycle and refrigerator starts cooling again. Defrost thermostat senses a preset
low temperature and resets (closes).
Subject capillary to appropriate temperature (refer to Technical Data Sheet for
model being serviced).
Damper door should close to within ¼
If altitude adjustment is required, turn altitude adjustment screw 1/8 turn
clockwise for each 1,000 feet increase in altitude.
There are no electrical connections to damper control. See Technical Data Sheet
for damper specifications for unit being serviced.
9
!
WARNING
of completely shut.
"
RS1200004 Rev. 0
5 F (see Technical
± °