Return to
Residential Refrigeration
and Front Venting Commercial Refrigeration
Service Manual
2.0
Safety Information
Refrigerant HFC-134a
All self-contained models covered in this service
manual are manufactured using refrigerant HFC-
134a.
Potential Problems with HFC-134a
HFC-134a
compressors
are manufactured with a
synthetic based ester oil charge.
•
The hygroscopic (water attraction) property of
ester oil is many times greater than that of the
mineral oils previously used with CFC-12.
•
High system moisture causes the formation
of acids and alcohol, which can damage the
compressor.
•
Systems or components of the refrigeration
system should not be left open to atmosphere
for more than (15) minutes at any time as
humidity from the air will enter the system and
be absorbed by the oil.
To ensure system dehydration:
•
System should be evacuated to a level less than
250 microns
•
When isolated, shall not exceed 500 microns for
a minimum of 10 minutes.
•
Vacuum pump oil must never be allowed to
enter the refrigeration system.
•
No leak detection dyes are authorized for use
within any Perlick Refrigeration Products.
•
Use of these materials will void complete sys-
tem warranty and place the burden on the
service company for down-line service issues.
Cleanliness of the system is extremely important.
•
The presence of residue (Chlorinated or greasy
residues, mineral oil, or impurities) can lead
to capillary tube restrictions, oil return prob-
lems and compressor damage.
•
A nitrogen purge should be utilized when
brazing.
•
Flux
must not
be used on any brazed joints.
Anytime a Perlick Refrigeration System is being
serviced:
•
It is recommended that the drier be changed
using the exact same style and size within the
system to avoid possible charge problems or
contaminant issues.
Service Manual Safety Labels
PLEASE READ all instructions completely before at-
tempting to service the unit. Take particular note of
the DANGER, WARNING and CAUTION information
in this manual. The information is important for the
safe and efficient service, operation and care of the
Perlick unit.
HAZARD!!
Indicates hazardous situation that will result
in death or serious injury if not avoided.
Indicates hazardous situation that may
result in death or serious injury if not
avoided.
Caution indicates hazardous situation that
could result in minor or moderate injury and
property damage.
Caution without symbol indicates unsafe practice
situation that could result in property damage only.
Safety Information
Page 2-1
