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What size line set do I need for an Air Conditioner?

What size line set do I need for an Air Conditioner?

So you're gathering all the materials needed to complete your purchase for your new air conditioner, but you don't know what line set to choose? This brief article will help you choose the correct line set size.

Common Mistake to Avoid

Some individuals make the common mistake of using the incorrect diameter of refrigeration copper piping when running the tubing long distances. This in turn, decreases your air conditioning system's performance and efficiency.

Choosing the Correct Line Set

When installing your copper refrigeration lines, make sure you have the correct tubing size based on the length the tubing will run. For example, a 3-ton air conditioner will need a 3/4" suction line when the distance ran is 25' feet or less. But, if the length of the run is over 25' feet, you will likely need a 7/8" or 1-1/8" suction line to get your full efficiency's worth and capacity.

Please make reference to the following line set sizing chart below:

Recommended Line Set Sizing Chart

Unit Tonnage

0-25 Feet

26-50 Feet

51-75 Feet

76-150 Feet

Line Diameter (Inches, OD)

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

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