SERVICING
41
With power ON:
WARNING
Line voltage now present
1. Check the serial data plate for the compressor locked
rotor amps (LRA) rating.
2. Using an ampmeter, measure the amperage reading
for the run and common wires to the compressor. Since
the compressor motor overload will likely trip soon after
drawing locked rotor amps, this measurement should be
taken as soon as the compressor starts.
3. If the amperage reading roughly equals the compressor
LRA rating and all other checks have been completed,
locked rotor amps has been verified.
Operation Test
If the voltage, capacitor, overload and motor winding test
fail to show the cause for failure:
WARNING
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 unit wiring from disconnect switch and wire a
test cord to the disconnect switch.
NOTE: The wire size of the test cord must equal the
line wire size and the fuse must be of the proper size
and type.
2. With the protective terminal cover in place, use the
three leads to the compressor terminals that were
disconnected at the nearest point to the compressor
and connect the common, start and run clips to the
respective leads.
3. Connect good capacitors of the right MFD and voltage
rating into the circuit as shown.
4. With power ON, close the switch.
WARNING
Line voltage now present
A. If the compressor starts and continues to run,
the cause for failure is somewhere else in the
system.
B. If the compressor fails to start - replace.
COPELAND COMPRESSOR
03 A 12345 L
YEAR
MONTH SERIAL
NUMBER
PLANT
Testing Crankcase Heater (Optional Item)
The crankcase heater must be energized a minimum of
four (4) hours before the condensing unit is operated.
Crankcase heaters are used to prevent migration or
accumulation of refrigerant in the compressor crankcase
during the off cycles and prevents liquid slugging or oil
pumping on start up.
A crankcase heater will not prevent compressor damage
due to a floodback or over charge condition.
WARNING
Disconnect ALL power before servicing.
1. Disconnect the heater lead in wires.
2. Using an ohmmeter, check heater continuity - should
test continuous. If not, replace.
NOTE: The positive temperature coefficient crankcase
heater is a 40 watt 265 voltage heater. The cool
resistance of the heater will be approximately 1800
ohms. The resistance will become greater as the
temperature of the compressor shell increases.
Summary of Contents for ASXC16
Page 4: ...PRODUCT IDENTIFICATION 4 ...
Page 5: ...PRODUCT IDENTIFICATION 5 ...
