Maytag MTB1893ARS Operations Instructions 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.

16025860

Component Description Test Procedures

Switch, upper

freezer light

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

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.

Before opening refrigeration system, recover HFC134a refrigerant for safe

disposal.

1. Cut drier out of system using the following procedure. Do not unbraze

drier since this will drive moisture into the system.

2. Score capillary tube close to drier and break. Reform inlet tube to drier

allowing enough space for large tube cutter.

3. Cut circumference of drier 1 ¼" below condenser inlet tube joint to

drier.

4. Remove drier.

5. Apply heat trap paste on post condenser tubes to protect grommets

from high heat.

6. Unbraze remaining part of drier. Remove drier from system.

7. 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 fresh

food 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.

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 MTB1893ARS Operations Instructions Page 8

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