Specifications

(3) Refrigerant Piping
Maximum Pipe 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 flow increases, thus lowering the cooling capacity, and as the result the
font compressor may become defective. Always choose the shortest path and follow the recommendation
as tabulated below:
24
Piping Sizes (Flare Connection Type)
Piping sizes are as follows:
R22
R410A
PIPING CONNECTION TO THE UNITS
• Align the center of the piping and tighten the flare nut sufficiently with fingers.
• Finally tighten the flare nut with torque wrench unit the wrench clicks.
• When tightening the flare nut with torque wrench, ensure the direction for tightening follows the arrow on
the wrench.
Pipe Size (mm/in) Torque (Nm)
6.35 (1/4) 18
9.52 (3/8) 42
12.70 (1/2) 55
15.88 (5/8) 65
19.05 (3/4) 78
Indoor 020D/DR 025D/DR 030D/DR
Model
Outdoor 018 / 020C/CR 025C/CR 028C/CR 030C/CR
Maximum Length, m 15 15 15 45
Maximum Elevation, m 8 8 8 25
Maximum No. of Bends 10 10 10 10
Indoor 040D/DR 050D/DR 062C/CR
Model
Outdoor 035 / 040C/CR 050C/CR 061C/CR
Maximum Length, m 45 45 35
Maximum Elevation, m 25 25 20
Maximum No. of Bends 10 10 10
Model MLC 018/020C/CR MLC 025C/CR MLC 028C/CR MLC 030C/CR
Liquid (mm/in) 6.35 / 1/4 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
Model MLC 035C/CR MLC 040C/CR MLC 050C/CR MLC 061C/CR
Liquid (mm/in) 9.52 / 3/8 9.52 / 3/8 9.52 / 3/8 12.70 / 1/2
Suction (mm/in) 19.05 / 3/4 19.05 / 3/4 19.05 / 3/4 19.05 / 3/4
Model M5LC 020C/CR M5LC 025C/CR M5LC 028C/CR M5LC 035C/CR
Liquid (mm/in) 6.35 / 1/4 6.35 / 1/4 9.52 / 3/8 9.52 / 3/8
Suction (mm/in) 12.70 / 1/2 15.88 / 5/8 15.88 / 5/8 15.88 / 5/8
Model M5LC 040C/CR M5LC 050C/CR M5LC 061C/CR
Liquid (mm/in) 9.52 / 3/8 9.52 / 3/8 9.52 / 3/8
Suction (mm/in) 15.88 / 5/8 15.88 / 5/8 19.05 / 3/4