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Application Information ACK-E-2009
(3) Refrigerant Piping
Maximum Piping Length and Maximum Number of Bends
When the pipe length becomes too long, both the capacity and reliability drop. As the number of bends
increases, system piping resistance to the refrigerant fl ow increases, thus lowering the cooling capacity,
and as the result the compressor may become defective. Always choose the shortest path and follow the
recommendation as tabulated below:
Model
Indoor 20E/ER 25E/ER 28E/ER 40E/ER 50E/ER
Outdoor 20C/CR 25C/CR 28C/CR 35/40C/CR 50C/CR
Maximum Length, m 15 15 15 45 45
Maximum Elevation, m 8 8 8 25 25
Maximum No. of Bends 10 10 10 10 10
Piping Sizes (Flare Connection Type)
Piping sizes are as follows:
R22
Model ALC 20C/CR ALC 25C/CR
Liquid (mm/in) 6.35 / 1/4 9.52 / 3/8
Suction (mm/in) 15.88 / 5/8 15.88 / 5/8
Model ALC 28C/CR ALC 35/ 40C/CR ALC 50C/CR
Liquid (mm/in) 9.52 / 3/8 9.52 / 3/8 9.52 / 3/8
Suction (mm/in) 15.88 / 5/8 19.05 / 3/4 19.05 / 3/4
R410A
Model A5LC 20C/CR A5LC 25C/CR
Liquid (mm/in) 6.35 / 1/4 6.35 / 1/4
Suction (mm/in) 12.70 / 1/2 15.88 / 5/8
Model A5LC 28C/CR A5LC 35C/CR A5LC 40C/CR A5LC 50C/CR
Liquid (mm/in) 9.52 / 3/8 9.52 / 3/8 9.52 / 3/8 9.52 / 3/8
Suction (mm/in) 15.88 / 5/8 15.88 / 5/8 15.88 / 5/8 15.88 / 5/8
05_Application Information_A.ind25 2505_Application Information_A.ind25 25 4/6/2009 3:32:56 PM4/6/2009 3:32:56 PM
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