Hfc-134A Refrigerant Service Information; General Rules For Working With 134A Refrigerant - Sub-Zero 700TC-3 Service Manual

Sealed System Information

HFC-134a REFRIGERANT SERVICE INFORMATION

The 700-3 Series sealed systems contain HFC-134a refrigerant. This section provides some general rules for work-
ing with 134a, and explains procedures to be followed while servicing the sealed system. This is followed by dia-
grams which illustrate 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.

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 filter-drier when servicing the sealed system.
• The filter-drier must be cut from the sealed system. Never un-braze the drier as the heat will drive moisture
back into the sealed system.
• Do not leave sealed system nor replacement compressor open to the atmosphere for more than 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.
#3758412 - Revision B - December, 2006
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