Refrigerant Line-Sets - Wine Guardian SP25 Installation, Operation And Maintenance Manual

Ducted split wine cellar cooling systems

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Installation, operation and maintenance manual (49 pages)

Quick start installation manual (2 pages)

Table Of Contents

Table of Contents

issues related to oil management that can impair performance and jeopardize the

compressor's lubrication.

• Provide a ½" (12.7mm) pitch in suction and liquid line toward the condensing unit for

every 10 ft (3 meters) of run to prevent any refrigerant that condenses in the suction

line from flowing to the compressor when the unit is off. These two lines can be routed

together and wrapped together, as long as the suction line is fully insulated, as

previously directed.

• Suction line riser traps are not required if the riser is properly sized to maintain

refrigerant velocity. Adding a trap will only increase pressure drop.

• Prevent dips, sags, or other low spots that will trap refrigerant oil, which is an issue

especially with long horizontal runs. Use hard refrigerant copper for longer horizontal

runs to prevent potential oil return problems. (See sample piping chart on page 27)

• When sweat connections are made in the connecting lines, be sure that the inside of

the tubing is clean before installing the unit. Use a dry nitrogen bleed during brazing.

Note: that compressor suction and discharge valves should be open to the

atmosphere no longer than 15 minutes. Compressors with POE (polyolester) oil will

quickly become contaminated when opened to atmosphere.