Component Testing; Temperature Control; Thermistor - Whirlpool ACM052MM Service Manual

Before testing any of the components, perform
the following checks:
• Control failure can be the result of corrosion
on connectors. Therefore, disconnecting and
reconnecting wires will be necessary through-
out test procedures.
• All tests/checks should be made with a VOM
or DVM having a sensitivity of 20,000 ohms-
per-volt DC, or greater.
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.

TEMPERATURE CONTROL

Models ACD052,
ACM052, ACM062
Refer to page 3-4 for the procedure for servic-
ing the temperature control.
1. Unplug air conditioner or disconnect power.
2. Disconnect the wires from the tempera-
ture control.
3. Set the ohmmeter to the R x 1 scale.
4. Touch the ohmmeter test leads to the
temperature control terminals.
5. Turn the control to the fully clockwise
(coldest) position. The meter should indi-
cate a closed circuit at approximately 70˚F,
or higher.

COMPONENT TESTING

Electrical Shock Hazard
• Check all connections before replacing com-
ponents, looking for broken or loose wires,
failed terminals, or wires not pressed into
connectors far enough.
• Resistance checks must be made with power
cord unplugged from outlet, and with wiring
harness or connectors disconnected.

THERMISTOR

Models ACQ058
& ACQ062
Refer to page 3-5 for the procedure for servic-
ing the thermistor.
1. Unplug air conditioner or disconnect power.
2. Disconnect the thermistor connector from
the electronic control board.
3. Set the ohmmeter to the R x 10K scale.
4. For the most accurate measurement, im-
merse the thermistor in ice water for 5
minutes, then use the 32°F/0°C reading in
the chart.
5. Touch the ohmmeter test leads to the wire
terminals on the connector.
6. The meter should indicate as shown in the
following chart (±10%).
Sensor Temperature
4-1
Resistance
°F (°C)
Ohms (Ω)
32 (0) 97,950
40 (4) 78,300
50 (10) 59,700
60 (15) 45,900
70 (21) 35,400
80 (27) 27,660
90 (32) 22,020