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Indoor Unit Located Level With, or Above Outdoor Unit
Nominal Btu/h
per refrigerant
circuit
Equivalent length 100’ to 125’
Equivalent length 126’ to 150’
Size inches O.D.
Size inches O.D.
Suction(2)
Liquid(3)
Hot gas
reheat(4)
Suction(2)
Liquid(3)
Hot gas
reheat(4)
42,000
3/4
1/2
1/2
3/4
1/2
5/8
48,000
7/8
1/2
5/8
7/8
1/2
5/8
60,000
7/8
1/2
5/8
7/8
1/2
5/8
72,000
7/8
5/8
5/8
7/8
5/8
5/8
84,000
7/8
5/8
3/4
7/8
5/8
3/4
96,000
1-1/8
5/8
3/4
1-1/8
5/8
3/4
120,000
1-1/8
7/8
3/4
1-1/8
3/4
3/4
150,000
1-3/8
3/4
7/8
1-3/8
3/4
7/8
180,000
1-1/8
3/4
7/8
1-1/8
7/8
1-1/8
220,000
1-3/8
7/8
1-1/8
1-3/8
7/8
1-1/8
250,000
1-3/8
7/8
1-1/8
1-5/8
7/8
1-1/8
300,000
1-5/8
1-1/8
1-1/8
1-5/8
1-1/8
1-1/8
350,000
1-5/8
1-1/8
1-1/8
1-5/8
1-1/8
1-1/8
400,000
1-5/8
1-1/8
1-3/8
1-5/8
1-1/8
1-3/8
Nominal Btu/h
per refrigerant
circuit
Equivalent length 151’ to 175’
Equivalent length 176’ to 200’
Size inches O.D.
Size inches O.D.
Suction(2)
Liquid(3)
Hot gas
reheat(4)
Suction(2)
Liquid(3)
Hot gas
reheat(4)
42,000
3/4
1/2
1/2
3/4
1/2
1/2
48,000
7/8
1/2
5/8
7/8
1/2
5/8
60,000
7/8
1/2
5/8
7/8
5/8
5/8
72,000
7/8
5/8
5/8
7/8
3/4
5/8
84,000
1-1/8
5/8
3/4
1-1/8
5/8
3/4
96,000
1-1/8
5/8
3/4
1-1/8
3/4
3/4
120,000
1-1/8
3/4
3/4
1-1/8
3/4
3/4
150,000
1-3/8
3/4
7/8
1-3/8
7/8
7/8
180,000
1-3/8
7/8
1-1/8
1-3/8
7/8
1-1/8
220,000
1-5/8
7/8
1-1/8
1-5/8
7/8
1-1/8
250,000
1-5/8
7/8
1-1/8
1-5/8
7/8
1-1/8
300,000
1-5/8
1-1/8
1-1/8
1-5/8
1-1/8
1-1/8
350,000
1-5/8
1-1/8
1-1/8
1-5/8
1-1/8
1-1/8
400,000
1-5/8
1-1/8
1-3/8
1-5/8
1-1/8
1-3/8
Table 3d: Lineset Recommended Sizes
(2) Loop piping to top of coil.
(3) Based on maximum vertical separation of 10 feet. Submit sketch for factory review if greater.
(4) Hot gas reheat, if ordered, requires one line per circuit. Pitch hot gas (discharge) lines in direction refrigerant flow - minimum 1/8"
per foot.
Example for dual circuit unit: if total system capacity is 240,000 Btu/h, divide by 2 and use the line sizes for 120,000 Btu/h for each
circuit. Follow industry standard refrigeration recommendations for piping. Suction (Vapor) and hot gas reheat lines must be insulated.
RC/FC Series Installation, Operation, and Maintenance Manual