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61
SERVICING
B. Shorted - indicator swings to zero and stops there - replace.
C. Open - no reading - replace. (Start capacitor would read
resistor resistance.)
S-16B CAPACITANCE CHECK USING A DIGITAL
MULTI-METER (IN CAPACITANCE MODE)
WARNING
Discharge capacitor through a 20 to 30 OHM
resistor before handling.
NOTE
: You can do this test with a multi-meter if you have a Ca
-
pacitance meter on your multi-meter.
1. Remove the capacitor from the circuit.
2. Now Select “Capacitance” on your multi-meter.
3. Now connect the capacitor terminals to the multi-meter
leads.
4. If the reading is near to the actual value of the capacitor (i.e.
the printed value on the capacitor). The capacitor is good.
(Note that the reading may be less than the actual printed
value of the capacitor).
5. If you read a significantly lower capacitance or none at all,
then capacitor is dead and must be replaced.
S-16 CHECKING FAN AND BLOWER MOTOR
WINDINGS (PSC MOTORS)
The auto reset fan motor overload is designed to protect the
motor against high temperature and high amperage conditions
by breaking the common circuit within the motor, similar to the
compressor internal overload. However, heat generated within
the motor is faster to dissipate than the compressor, allow at
least 45 minutes for the overload to reset, then retest.
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
1. Remove the motor leads from its respective connection
points and capacitor (if applicable).
2. Check the continuity between each of the motor leads.
3. Touch one probe of the ohmmeter to the motor frame
(ground) and the other probe in turn to each lead.
If the windings do not test continuous or a reading is obtained
from lead to ground, replace the motor.
S-16A CHECKING HIGH EFFICIENCY MOTORS
The motor is a one piece, fully encapsulated, 3 phase brushless
DC (single phase AC input) motor with ball bearing construction.
1. Using a voltmeter, check for 230 volts to the motor connec
-
tions L and N. If 230 volts is present, proceed to step 2. If
230 volts is not present, check the line voltage circuit to the
motor.
2. Using a voltmeter, check for 24 volts from terminal C to
either terminal 1, 2, 3, 4, or 5, depending on which tap is
being used, at the motor. If voltage present, proceed tostep
3. If no voltage, check 24 volt circuit to motor.
3. If voltage was present in steps 1 and 2, the motor has failed
and will need to be replaced.
Note
: When replacing motor, ensure the belly band is between
the vents on the motor and the wiring has the proper drip loop
to prevent condensate from entering the motor.
C L G N
1 2 3 4 5
High Voltage
Connections
3/16"
Low Voltage Connections
1/4”
Motor Connections
S-17B EEM BLOWER REPLACEMENT
For AWUF19-25, AWUF31-32, and AWUF37 Air Handlers.
1. Disconnect power at main electrical panel.
2. Remove front access panel.
3. Remove the two screws on each side holding the lower
control box and move out of the way to give access to the
blower assembly
Содержание DAR09
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