Maytag Ice2O MFI2665XEM Owner's Manual download pdf (Page 8)

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.

8 16026312

Component Description Test Procedures

Drier

Drier is placed at post condenser loop

outlet and passes liquified refrigerant to

capillar

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 sy

stem 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 w

ith customer. If refrigerator is

under warranty, old drier must accompany warranty claim.

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°F

transferring heat from freezer section to

refrigerant.

Passing through suction line to

compr

essor, 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.

Test for leaks in evaporator with electronic leak detector or w

ith 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

evaporator up to a maximum of 140 PSI w

ith a refrigerant and dry nitrogen

combination.

2. Recheck for leaks.

Thermostat

(defrost)

Thermostat is in a series circuit with

terminal main control board and defrost

heater.

Controls the circuit from main control

board through defrost thermostat to

defrost heater. Opens and breaks circuit

hen thermostat senses preset high

temperature.

Test continuity across terminals.

With power off and evaporator coil below freezing, thermostat should show

“0”

ohms when checked with ohmmeter. See “Heater, evaporator (defrost)” section

for additional tests. If evaporator coil is warm, should show 56k ohms with an ohm

meter.

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).

WARNING

To avoid severe personal injury or death from sudden eruption of high

pressures 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

ithout a reliable pressure regulator and pressure relief valve in the

lines.

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.

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Maytag Ice2O MFI2665XEM Owner's Manual Page 8

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