Compressor Windings; Resistance Test; Compressor Ground Test; Test Cord Connections - Amana PTAC Service Instructions Manual

SERVICING
1. Remove the motor leads from their respective con-
nection 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 ob-
tained from lead to ground, replace the motor.
WARNING
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
compressor.
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.
54
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 con-
nection is a must) and the other probe to each compressor
terminal in turn. If a reading is obtained, then the com-
pressor is grounded and must be replaced.
Ohmmeter

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

L1
L2
Fuses
Capacitor
1. Connect a good capacitor of the right MFD and voltage
rating into the circuit as shown.
Compressor
Top
Accumulator
Outlet
Terminals
R S
C
Compressor
Top
Accumulator
Outlet
Terminals
R S
C