6. SYSTEM DESIGN
SEPARATION TUBE3-2.
PIPE CONNECTION
CAUTION
Be sure to apply the pipe against the port on the indoor unit correctly. If the centering is improper,
the flare nut cannot be tighten smoothly. If the flare nut is forced to turn, the threads will be
damaged.
Do not remove the flare nut from the indoor unit pipe until immediately before connecting the
connection pipe.
Hold the torque wrench at its grip, keeping it in the right angle with the pipe, in order to tighten the
flare nut correctly.
Tighten the flare nuts with a torque wrench using the specified tightening method. Otherwise,
the flare nuts could break after a prolonged period, causing refrigerant to leak and generate a
hazardous gas if the refrigerant comes into contact with a flame.
hen the are nut is tightened proper b our hand hod the bod side couping with a separate
spanner then tighten with a torue wrench. ee the tabe beow or the are nut tightening torues.
Flare nut
[mm (in.)]
Tightening torque
[N·m]
6.35 (1/4) 16 to 18
9.52 (3/8) 32 to 42
12.70 (1/2) 49 to 61
15.88 (5/8) 63 to 75
19.05 (3/4) 90 to 110
Type of separation tube
Name and shape
Liquid pipe Gas pipe
Positioning of separation tube
CAUTION
If it is placed horizontally, keep it within ± 15°. Otherwise, it will not separate the refrigerant evenly,
causing a reduction in performance.
Place the separation tube in a horizontal position as much as possible. Only place the separation
tube as shown below during unavoidable circumstances.
A
B
A
B
A
B
±15°
Horizontal
OK
A: Outdoor unit or Separation tube
B: Branch box or Separation tube
OK OK
Not good Not good
Horizontal
line
Vertical
or
- (06 - 30) -
SYSTEM
DESIGN
SYSTEM
DESIGN
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