SERVICING
46
WARNING
D
AMAGE CAN OCCUR TO THE EMBEDDED TERMINALS AT THIS POINT IF THE
LEADS ARE NOT PROPERLY REMOVED, WHICH CAN RESULT IN THE
TERMINAL VENTING AND HOT OIL DISCHARGING.
HI-POT
COMPRESSOR GROUND TEST
2. Identify the leads and using a Megger, Hi-Potential Ground
Tester, or other suitable instrument which puts out a volt-
age between 300 and 1500 volts, check for a ground sepa-
rately between each of the three leads and ground (such
as an unpainted tube on the compressor). Do not use a
low voltage output instrument such as a volt-ohmmeter.
3. If a ground is indicated, then carefully remove the com-
pressor terminal protective cover and inspect for loose
leads or insulation breaks in the lead wires.
4. If no visual problems indicated, carefully remove the leads
at the compressor terminals.
Carefully retest for ground, directly between compressor
terminals and ground.
5. If ground is indicated, replace the compressor.
S-17D Operation Test
If the voltage, capacitor, overload and motor winding test fail
to show the cause for failure:
WARNING
HIGH
VOLTAGE
D
ISCONNECT ALL POWER BEFORE SERVICING OR
INSTALLING THIS UNIT.
M
ULTIPLE 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.
4. With power ON, close the switch.
WARNING
L
INE 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.
Compressor Serial Number Identification
COPELAND COMPRESSOR
E · 93 J 123456
Motor Shift Year Month Serial No
TECUMSEH COMPRESSOR
T:
G 22 93C 123456
Month Day Year Serial No
Day of
Year
Year Serial No
BRISTOL COMPRESSOR
291 93 123456
S-18 TESTING CRANKCASE HEATER
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 accumu-
lation of refrigerant in the compressor crankcase during the
off cycles and prevents liquid slugging or oil pumping on start
up. Scroll Compressors are not equipped with a crankcase
heaters.
A crankcase heater will not prevent compressor damage due
to a floodback or over charge condition.
WARNING
HIGH
VOLTAGE
D
ISCONNECT
ALL
POWER BEFORE SERVICING OR
INSTALLING THIS UNIT.
MULTIPLE POWER SOURCES MAY
BE PRESENT.
F
AILURE TO DO SO MAY CAUSE PROPERTY
DAMAGE, PERSONAL INJURY OR DEATH.
1. Disconnect the heater lead wires.
2. Using an ohmmeter, check heater continuity - should test
continuous, if not, replace.
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