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S-17 COMPRESSOR WINDINGS
1. Remove the chassis from the wall sleeve.
2. Remove the compressor terminal cap and disconnect all
compressor wiring.
3. After capturing the refrigerant from the system, debraze
the inlet and discharge tubing from the compressor.
4. Remove the three foot mounting bolts and remove the com-
pressor.
WARNING
If the test indicates shorted, grounded or open windings, see
procedure for the next steps to be taken.
Resistance Test
1. With no power, remove the leads from the compressor
terminals.
2. Touch the leads of an ohmmeter to terminals C-S, start
windings and C-R, run winding.
Ground Test
With no power and compressor leads removed:
Set an ohmmeter on its highest scale. Touch one lead to the
compressor body (clean point of contact, as a good connec-
tion is a must) and the other probe to each compressor termi-
nal in turn. If a reading is obtained, then the compressor is
grounded and must be replaced.
Ohmmeter
C
R S
Compressor
Top
Outlet
Terminals
Accumulator
Compressor Ground Test
If the voltage, capacitor, overload and motor windings test fail
to show the cause for failure.
WARNING
With no power, wire a test cord to line voltage (L1 & L2).
NOTE:
The wire size of the test cord must equal the line size,
and the fuses in the test line must be of the proper size and
type.
Test Cord Connections
C
R S
Compressor
Top
Outlet
Terminals
Accumulator
Capacitor
L1
L2
Fuses
1. Connect a good capacitor of the right MFD and voltage
rating into the circuit as shown.
2. Carefully apply line voltage.
a. If the compressor starts and continues run, the cause
for failure is somewhere else in the system.
b. If the motor fails to start - replace.
Since all single phase compressors are of the permanent split
capacitor design the high and low side pressure must be ap-
proximately equal or the low torque compressor may not start.
S-17A OVERLOAD
Each compressor is equipped with an internal overload.
The line break internal overload senses both motor amperage
and winding temperature. High motor temperature or amper-
age heats the disc causing it to open, breaking the common
circuit within the compressor.
Fuse, circuit breaker, ground fault protective device, etc. has
not tripped.
1
.
With no power to the unit, remove the compressor cover,
and overload lead from the compressor terminal.
2. Using an ohmmeter: Test continuity between terminals of
the overload. If not continuous, the overload is open, re-
place the overload.
SERVICING
