
(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:
26
Piping Sizes (Flare Connection Type)
Piping sizes are as follows:
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 MCM 020D/DR MCM 025D/DR MCM 030D/DR
MODEL
Outdoor
MLC 018C
MLC / M4LC
020B/BR
MLC 020C/CR
MLC / M4LC
025B/BR
MLC 025C/CR
MLC 028C/CR
MLC / M4LC
030C/CR
Max. Length, m 15 15 15 45
Max. Elevation, m 8 8 8 25
Max. No. of Bends 10 10 10 10
Indoor MCM / R5CM 040D/DR
MCM / M5CM
050D/DR
MCM / M5CM
062C/CR
MODEL
Outdoor
MLC / M4LC /
M5LC 035C/CR
MLC / M4LC /
M5LC 040C/CR
MLC / M4LC /
M5LC 050C/CR
MLC / M4LC /
M5LC 061C/CR
Max. Length, m 45 45 45 35
Max. Elevation, m 25 25 25 20
Max. No. of Bends 10 10 10 10
Model
MLC / M4LC 020B/BR
MLC 018C / 020C/CR
MLC / M4LC 025B/BR
MLC 025C/CR
MLC 028C/CR
Liquid (mm/in) 6.35 / ¼ 9.52 / 3/8 9.52 / 3/8
Suction (mm/in) 15.88 / 5/8 15.88 / 5/8 15.88 / 5/8
Model
MLC / M4LC
030C/CR
M5LC 035/ 040C/CR
MLC 035C/CR
MLC / M4LC
040/050C/CR
M5LC 050/061C/CR
MLC 061C/CR
Liquid (mm/in) 9.52 / 3/8 9.52 / 3/8 9.52 / 3/8 12.7 / ½
Suction (mm/in) 15.88 / 5/8 19.05 / ¾ 19.05 / ¾ 19.05 / ¾
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