Friedrich 000 BTU'S Manual De Usuario

34

Locked rotor voltage (L.R.V.) is the actual voltage available 

at the compressor under a stalled condition.

 

Disconnect power from unit. Using a voltmeter, attach one  

lead of the meter to the run “R” terminal on the compressor 

and the other lead to the common “C” terminal of the com-

pressor. Restore power to unit.

 

Determine L.R.V. 

Start the compressor with the volt meter attached; then  stop 

the unit. Attempt to restart the compressor within a couple 

of seconds and immediately read the voltage on the meter. 

The compressor under these conditions will not start and will 

usually kick out on overload within a few seconds since the 

pressures in the system will not have had time to equalize. 

Voltage should be at or above minimum voltage of 197 VAC, 

as specified on the rating plate. If less than minimum, check 

for cause of inadequate power supply; i.e., incorrect wire 

size, loose electrical connections, etc. 

Turn  off  electric  power  before  service  or 

installation.  Extreme  care  must  be  used,  if  it 

becomes necessary to work on equipment with 

power applied.

 

Failure to do so could result in serious injury or 

death.

Heat generated within the compressor shell, usually due  

to recycling of the motor, is slow to dissipate. It may take  

anywhere from a few minutes to several hours for the  

overload to reset. 

 

With power off, remove the leads from compressor termi-

nals. If the compressor is hot, allow the overload to cool 

before starting check. Using an ohmmeter, test continu-

ity across the terminals of the external overload. If you 

do not have continuity; this indicates that the overload is 

open and must be replaced. 

The overload is embedded in the motor windings to 

sense the winding temperature and/or current draw. The 

overload is connected in series with the common motor 

terminal.

1. With no power to unit, remove the leads from the com-

pressor terminals. Allow motor to cool.

2. Using an ohmmeter, test continuity between terminals 

C-S and C-R. If no continuity, the compressor overload is 

open and the compressor must be replaced.

amperage (L.R.a.) test 

The running amperage of the compressor is the most  impor-

tant of these readings.  A running amperage higher  than that 

indicated in the performance data indicates that  a problem 

exists mechanically or electrically.

 

NOTE: Consult the specification and performance section  

for running amperage. The L.R.A. can also be found on  the 

rating plate.  

 

Select the proper amperage scale and clamp the meter 

probe around the wire to the “C” terminal of the compressor. 

Turn on the unit and read the running amperage on the  me-

ter. If the compressor does not start, the reading will  indicate 

the locked rotor amperage (L.R.A.). 

The compressor is equipped with an external or internal 

overload  which senses both motor amperage and wind-

ing temperature. High motor temperature or amperage 

heats the overload causing it to open, breaking the com-

mon circuit within the compressor. 

Certain unit components operate at 

temperatures hot enough to cause burns.

Proper safety procedures must be followed, 

and proper protective clothing must be 

worn.

Failure to follow this warning could result 

in moderate to serious injury. 

Turn  off  electric  power  before  service  or 

installation.  Extreme  care  must  be  used,  if  it 

becomes  necessary  to  work  on  equipment 

with power applied.

 

Failure to do so could result in serious injury or 

death.