Figure 7-41.Procedures for observing operating pressures, charging, purging, and evacuating a unit.
CLEANING A BADLY CONTAMINATED
The system may have been operated for a time
with water or moisture in it.
A refrigerant system can become badly contami-
nated for a number of reasons.
A badly contaminated system contains water,
carbon, and other decomposition products. When such
The compressor may have been run for some
time with a severe leak or an opening in the
The compressor may have failed due to damage
a condition exists, the system must be flushed with a
special flushing agent, using equipment designed
especially for this purpose. Follow the suggestions
and procedures outlined for proper cleaning.
The system may have been damaged by a
collision and left open for some time.
The system may not have been cleaned properly
after a previous failure.
A refrigerant to be suitable as a flushing agent
must remain in the liquid state during the flushing
operation to wash the inside surfaces of the system
components. Refrigerant vapor will not remove