Specifications

SERVICING
186 Rev. 3
WARNING
Disconnect Electrical Power Supply:
1. Remove the leads from the compressor terminals.
WARNING
SEE WARNING S-17 PAGE 44 BEFORE REMOVING COM-
PRESSOR TERMINAL COVER.
2. Using an ohmmeter, test continuity between terminals
S-R, C-R, and C-S, on single phase units or terminals
T2, T2 and T3, on 3 phase units.
S
R
C
COMP
OHMMETER
TESTING COMPRESSOR WINDINGS
If either winding does not test continuous, replace the com-
pressor.
NOTE: If an open compressor is indicated allow ample time
for the internal overload to reset before replacing compres-
sor.
S-17B Ground Test
If fuse, circuit breaker, ground fault protective device, etc.,
has tripped, this is a strong indication that an electrical prob-
lem exists and must be found and corrected. The circuit pro-
tective device rating must be checked and its maximum rat-
ing should coincide with that marked on the equipment name-
plate.
With the terminal protective cover in place, it is acceptable to
replace the fuse or reset the circuit breaker ONE TIME ONLY
to see if it was just a nuisance opening. If it opens again, DO
NOT continue to reset.
WARNING
Disconnect all power to unit, making sure that all power
legs are open.
1. DO NOT remove protective terminal cover. Disconnect
the three leads going to the compressor terminals at the
nearest point to the compressor.
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.
HI-POT
COMPRESSOR GROUND TEST
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.
WARNING
DAMAGE CAN OCCUR TO THE GLASS EMBEDDED TER-
MINALS IF THE LEADS ARE NOT PROPERLY REMOVED,
WHICH CAN RESULT IN THE TERMINAL VENTING AND
HOT OIL DISCHARGING.
Carefully retest for ground, directly between compressor ter-
minals and ground.
5. If ground is indicated, replace the compressor.
S-17C Operation Test
If the voltage, capacitor, overload and motor winding test fail
to show the cause for failure:
WARNING
Disconnect Electrical Power Supply:
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.