53
SERVICING
WARNING
Discharge capacitor through a 20 to 30 OHM
resistor before handling.
Capacitance (MFD) = 2650 X Amperage
Voltage
S-16 Checking Motors
S-16A Checking Fan And Blower Motor Windings
(Psc Motors)
Applies only to units with 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 this unit. 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-16D Checking Eem (Energy Efficient Motor
Motors
Applies only to units with EEM Motors
The EEM Motor is a one piece, fully encapsulated, 3 phase
brushless DC (single phase AC input) motor with ball
bearing construction. Unlike the ECM 2.3/2.5 motors, the
EEM features an integral control module.
1. Using a voltmeter, check for 230 volts to the motor
connections 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 to step 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”
EEM Motor Connections
Summary of Contents for DRG0361DL00001S
Page 20: ...20 SYSTEM OPERATION...
