
(3) Refrigerant Piping
Maximum Pipe 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:
Piping Sizes (Flare connection type)
Piping sizes are as follows:
Piping Connection to The Units
• Align the centre 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.
22
R22
R410A
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
Model MLC 010C/CR MLC 015C/CR MLC 018/020C/CR MLC 025C/CR
Liquid (mm/in) 6.35 / 1/4 6.35 / 1/4 6.35 / 1/4 9.52 / 3/8
Suction (mm/in) 9.52 / 3/8 12.70 / 1/2 15.88 / 5/8 15.88 / 5/8
Model MLC 028 / 030C/CR MLC 035 / 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) 15.88 / 5/8 19.05 / 3/4 19.05 / 3/4 19.05 / 3/4
Model M5LC 010C/CR M5LC 015C/CR M5LC 020C/CR M5LC 025C/CR
Liquid (mm/in) 6.35 / 1/4 6.35 / 1/4 6.35 / 1/4 6.35 / 1/4
Suction (mm/in) 9.52 / 3/8 12.70 / 1/2 12.70 / 1/2 15.88 / 5/8
Model M5LC 028 / 035C/CR M5LC 040C/CR M5LC 050C/CR M5LC 061C/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 19.05 / 3/4
Indoor 010 /
015C/CR
020 /
025C/CR
028 / 030C/CR
038 / 040 /
050C/CR
060C/CR
Model
Outdoor 010 /
015C/CR
020 /
025C/CR
028C/CR 030C/CR
035 / 040/
50C/CR
061C/CR
Maximum Length, m 15 15 15 45 45 35
Maximum Elevation, m 8 8 8 25 25 25
Maximum No. of Bends 10 10 10 10 10 10
Comentarios a estos manuales