4-1
COMPONENT TESTING
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.
TEMPERATURE CONTROL
Models ACQ058
& ACQ062
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
THERMISTOR
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%).
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.
• 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.
Sensor Temperature
°F (°C)
Resistance
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
Models ACD052,
ACM052, ACM062
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