Perlick BBS60 - Page 7

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Return to Table of Contents Safety Information Page 2-1
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 Commercial Refrigeration
Products.
• Use of these materials will void complete
system 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 problems and compressor damage.
• A nitrogen purge should be utilized when
brazing.
• Flux must not be used on any brazed joints.
Anytime a Perlick Commercial 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
attempting 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.