Linesets

Linesets have come into wide use in most areas of the country because they offer a better way to field connect split system air conditioners and heat pumps. Major advantages include:

• Installation is quick, efficient, and economical
• Everything required is in a single box. Tube cutters, insulation knives and rolls of tape are not needed.
• The continuous, factory-applied insulation has no seams which can open to allow moisture entry, bothersome dripping and decreased system efficiency.
• They can be supplied in correct lengths for each job reducing waste.
• Factory assembly assures quality and consistency.
• The holding charge in the lines prevents system contamination

Why buy Cambridge-Lee Linesets?

Cambridge-Lee Industries is one of the leading U.S. producers of copper tubing for plumbing, heating, refrigeration, air conditioning and industrial usages. We employ the most modern equipment in communications, data gathering and statistical process control in order to assure that all products are manufactured to the highest quality standards and that they will meet the needs of those who use them.

Cambridge-Lee Industries through years of manufacturing is extremely knowledgeable with regards to requirements for copper tubing that will be used in an air conditioning system. We know the damage that can be caused by the presence of oxides, sulfides, lubricant residues or other foreign material inside systems employing modern high efficiency compressors. Numerous steps are taken at all stages of production to assure absolute cleanliness.

Cambridge-Lee Industries knows that a consistent, soft-annealed temper is needed in the linesets in order to allow field forming without kinking of the tubes during bending.

To put it briefly, Cambridge-Lee Industries does everything to be certain that the lineset will do what a lineset is supposed to do.

Special Requirements

Cambridge-Lee Industries offers 324 different standard combinations of lengths, insulation thicknesses, liquid and suction line sizes. In addition, sets can be ordered with an optional 90° bend at one end of the suction line at no charge. Flare nuts can be supplied at one or both ends of both lines at an extra cost.

Lengths: Cambridge-Lee offers linesets in nine standard lengths, 10 to 50 feet in five foot increments. To meet special needs or for large projects with repetitive design requirements they can be ordered in any exact lengths from five to 60 feet.

Combinations: There are nine standards liquid line/suction line size combinations. In addition, sets can be furnished with other combinations, for example:
          1/4" LL x 3/8" SL, 5/16" LL x 7/8 SL, 1/2" LL x 7/8" SL and 1/2" LL x 1-1/8" SL

Suction Lines Only: Some users choose to order insulated suction lines with no liquid line. These sets find usage in chilled water and warm water installations in addition to their use in connecting split system air conditioners.

Mini-Split Systems: Cambridge-Lee furnishes linesets with flare nuts and insulation on both the liquid line and the suction line for the installation of mini-split systems where the expansion value is located in the outdoor portion of the system.

Contact Cambridge-Lee Industries for your special requirements.

Submittal Data

There are no industry standards or specifications for linesets as assembled and supplied for use in connecting split system air conditioners and heat pumps. However, Cambridge-Lee employs the following designated materials in the production of its linesets.

Copper Tubing: The basic material is phosphorus deoxidized copper, high residual phosphorus (commonly referred to as D.H.P.) with a chemical composition of 99.9% CU minimum and .015% to .040% P. The tubing is fully bright annealed to a "dead soft" temper. Tube sizes are 1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 7/8" and 1-1/8" outside diameter.

Insulation: The insulation is flexible black elastomeric thermal insulation in thicknesses of 3/16", 1/4", 3/8" and 1/2". It's thermally effective range is from -40°F to 200°F. It is produced to meet the requirements of ASTM C 534, Type I-tubular. It has a thermal conductivity of .27 BTU/in/hr/ft²/°F at 75°F mean temperature as measured by ASTM C 177.

Holding Charge: Both the liquid line and the suction line contain a holding charge of dry nitrogen gas (N²) at a positive pressure (above atmospheric pressure) secured by sulphur-free rubber plugs at each end of each line.