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Copper Linesets

What is a Copper lineset?

A lineset consists of two semi-flexible copper tubes: (1) the liquid line, and, (2) the suction line. The lineset connects the outside air conditioner or heat pump (compressor) to the indoor evaporator coil (air handler or furnace coil). The liquid line diameter for all standard residential systems is 3/8” and moves the refrigerant when it is a liquid; the suction line diameter is 3/4", 7/8” or 1 1/8” depending on the size and efficiency of the air conditioner or heat pump and  moves the refrigerant when it is a gas / vapor. The suction line transports the heat from inside to the outside to cool the home in the summer, and, in a heat pump application, the direction of the heat flow is reversed sending heat to the inside to warm the home in the winter.

The suction line is typically insulated to maintain a stable vapor temperature. How much insulation is needed varies, but up to three quarter of an inch of insulation around the suction line is not unheard of. The liquid line is smaller than the suction line, and it is used to transfer the refrigerant while in liquid form. Most liquid lines are not insulated, since it is desirable for  the refrigerant to sub-cool and save energy.

Linesets can be made from various metals but copper is the metal of choice due to its corrosion resistance, reasonable cost and heat conductivity. Line sets come in several lengths and are designed to be cut to fit your exact need. They are manufactured in accordance with the American Society for Testing and Materials (ASTM) Standard Specification B280

When purchasing refrigeration lines, measure the length of line set needed to connect your outdoor condenser to the indoor forced air equipment. Based on that length, the correct size diameter line set can be selected which will ensure your system meets the listed SEER rating and capacity. Once you have accurately measured the length needed, use our chart below as a guide to find the diameter best for your system.

 

 

A Guide to line sets

 

 

Distance

0 – 25’

26’ – 50’

51’ – 75’

76’ – 150’

 

Diameter measured O.D.

Unit tons

Suction

Liquid

Suction

Liquid

Suction

Liquid

Suction

Liquid

1.5

3/4”

3/8”

3/4"

3/8”

3/4"

3/8”

7/8”

3/8”

2.0

3/4”

3/8”

3/4"

3/8”

3/4"

3/8”

7/8”

3/8”

2.5

3/4”

3/8”

3/4"

3/8”

7/8”

3/8”

7/8”

3/8”

3.0

3/4”

3/8”

7/8”

3/8”

1 1/8”

3/8”

1 1/8”

3/8”

3.5

7/8”

3/8”

1 1/8”

3/8”

1 1/8”

3/8”

1 1/8”

3/8”

4.0

7/8”

3/8”

1 1/8”

3/8”

1 1/8”

3/8”

1 1/8”

3/8”

5.0

7/8”

3/8”

1 1/8”

3/8”

1 1/8”

3/8”

1 1/8”

3/8”

For extended compressor life, if you're running a line set longer than 80 feet consider the following accessory:

  • Hard-Start Capacitor – This will help the compressor during startup with the extra work required from an increased refrigerant charge level.

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