Friedrich SH20L50-A Manual De Usuario

4

COMPRESSOR WINDING TEST (Figure 2.)

Remove the compressor terminal box cover and 
disconnect the wires from the terminals. Using an 
ohmmeter, check continuity across the following:

Compressors are single phase, 208/230 volt.  All 
compressor motors are permanent split capacitor 
type, using only a running capacitor across the start 
and run terminal.

All compressors are internally spring mounted and 
externally mounted on rubber isolators.

The compressor is equipped with an internal line 
voltage overload.  This overload is embedded in the 
windings of the motor to sense the motor temperature.  
The overload will open and disconnect the power to the 
motor due to high temperatures caused by:

1.  A locked rotor.

2.  Excessive running amps.

3.  High discharge temperature.

4.  Low refrigerant charge.

OHMMETER

1.  Terminal "C" and "S" - no continuity - open 

winding - replace compressor.

2.  Terminal "C" and "R" - no continuity - open 

winding - replace compressor.

3.  Terminal "R" and "S" - no continuity  open 

winding - replace compressor.

4.  Terminal "C" and the shell of the compressor 

– continuity – grounded motor – replace 
compressor.

5.  Should continuity exist between terminals 

"R" and "S", but not between terminals 
"C" and "S" and "C" and "R", the internal 
overload may be open.  If the compressor 
is  extremely  hot,  allow  it  suffi cient  time  to 
cool.  It may require as long as one hour for 
the compressor to cool suffi ciently for the 
internal overload to close.