Overload / Relay; Temperature Control; Ice Maker; Condenser Motor - Maytag ATB1504ARQ Service Manual

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

Overload / Relay

When voltage is connected and relay is
cool, current passes through relay to start
winding.
After a short time, current heats the
resistor in relay and resistance will raise
blocking current flow through relay.
Start winding remains in the circuit through
run capacitor.
Solid state relay plugs directly on
compressor start and run terminals. Relay
terminals 2 and 3 are connected within
relay. Run capacitor is connected to relay
terminal 3. L2 side of 120 VAC power is
connected to relay terminal 2.
Temperature Temperature control is a capillary tube
control operating a single pole, single throw
switch.
Temperature control controls run cycle
through defrost timer.
Altitude Adjustment
When altitude adjustment is required on a
G.E. control, turn altitude adjustment
screw 1/7 turn counter clockwise for each
1,000 feet increase in altitude up to 10,000
feet. One full turn equals 10,000 feet
maximum.
In most cases the need for altitude
adjustments can be avoided by simply
turning temperature control knob to colder
setting.

Ice maker

Optional on some models.
See "Ice Maker" section for service
information.

Condenser motor

Condenser fan moves cooling air across
condenser coil and compressor body.
Condenser fan motor is in parallel circuit
with compressor.
Evaporator fan Evaporator fan moves air across
motor evaporator coil and through the refrigerator
and freezer compartment.
©2003 Maytag Appliances Company
!
WARNING
Test Procedures
1. Disconnect power to the refrigerator.
2. Remove relay cover and disconnect leads.
3. Check resistance across terminals 2 and 3 with an ohmmeter:
Normal = 3 to 12 ohms
Shorted = 0 ohms
Open = infinite ohms
Check for proper calibration with thermocouple capillary in air supply well by
recording cut-in and cut-out temperatures at middle setting. Refer to tech sheet
for model being serviced for expected temperatures.
Check control contacts are opening by disconnecting electrical leads to control
and turning control knob to coldest setting. Check for continuity across
terminals.
Altitude Counter in Feet
Turn Screw
Feet Above Clockwise (Angular
Sea Level Degrees)
2,000 30
4,000 81
6,000 129
8,000 174
10,000 216
Check resistance across coil.
1. Disconnect power to unit.
2. Disconnect fan motor leads.
3. Check resistance from ground connection solder. Trace to motor frame must
not exceed .05 ohms.
4. Check for the proper operating voltage at the connector to motor with unit in
refrigeration mode and compressor operating.
7
0
330
30
300
60
270
90
240 120
210
150
180
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