Sub-Zero INTEGRATED Series Service Manual page 35

Sealed System Information
HFC-134a REFRIGERANT SERVICE INFORMATION
The sealed system in this Series contain HFC-134a refrigerant. This section of the manual provides general rules
for working with 134a, and procedures to be followed while servicing the sealed system. This is followed by dia-
grams illustrating sealed system operation, then model-specific refrigerant flow diagrams.
• 134a refrigerant requires Synthetic Ester oil in the compressor, and does not tolerate contamination
from other refrigerants, moisture, petroleum-based lubricants, silicone lubricants, cleaning compounds,
rust inhibitors, leak detection dyes, or any other type of additive.
• If servicing the sealed system, do not leave it nor any replacement components open to the atmos-
phere for more than ten (10) minutes, as the Synthetic Ester oil will attract moisture.
General Rules for Working with 134a Refrigerant:
• Use equipment dedicated to 134a sealed system service only.
• Use only 134a refrigerant for back-flushing and sweep charging.
• Always replace the high-side filter-drier when servicing the sealed system.
• The high-side filter-drier must be cut from the sealed system. Never un-braze any sealed system joint as the
heat will drive moisture into the sealed system.
• Do not leave the sealed system nor replacement compressor open to the atmosphere for more than then ten
(10) minutes.
• When the rubber plugs are pulled from the service compressor, a release of pressure should be heard. If no
release of pressure is heard, do not use the compressor.
• Use ONLY virgin 134a refrigerant when recharging the sealed system.
#7015817 - Revision A - January, 2010
INTEGRA TED
INTEGRA TED
(736 T
(736 T
4-2
SERIES
SERIES
all SWS #2970000)
all SWS #2970000)