11
• Projection margin in flaring :
B (Unit : mm)
Rigid (Clutch type)
Imperial (Wing nut type)
Connection of refrigerant pipe
Connect all the refrigerant pipes with flare connecting
work.
• Since the atmospheric pressure only is sealed as the
sealing gas, it is not abnormal that “Pushu…” sound
is not heard when the flare nut is removed.
• Be sure to use a double spanner for pipe connecting
work of the indoor unit.
• Refer to the following table for tightening torque.
Connecting pipe
outer dia. (mm)
Ø6.4
Ø9.5
Ø12.7
Ø15.9
Tightening torque
(N•m)
14 to 18
(1.4 to 1.8 kgf•m)
33 to 42
(3.3 to 4.2 kgf•m)
50 to 62
(5.0 to 6.2 kgf•m)
68 to 82
(6.8 to 8.2 kgf•m)
Re-tightening
torque (N•m)
18
(1.8 kgf•m)
42
(4.2 kgf•m)
50
(5.0 kgf•m)
68
(6.8 kgf•m)
Airtight test/Air purge, etc.
For airtight test, air purge, addition of refrigerant, and
gas leak check, follow the Installation Manual attached
to the outdoor unit.
Open fully valves of the outdoor unit
Gas leak check
Check with a leak detector or soap water whether gas
leaks or not, from the pipe connecting section or cap
of the valve.
REQUIREMENT
Use a leak detector manufactured exclusively for
HFC refrigerant (R410A, R134a, etc.).
Outer diam. of
copper pipe
6.4
9.5
12.7
15.9
R410A tool used
R410A
R22
0 to 0.5 (Same as left)
0 to 0.5 (Same as left)
0 to 0.5 (Same as left)
0 to 0.5 (Same as left)
Conventional tool used
R410A
R22
1.0 to 1.5
0.5 to 1.0
1.0 to 1.5
0.5 to 1.0
1.0 to 1.5
0.5 to 1.0
1.0 to 1.5
0.5 to 1.0
Outer diam. of copper pipe
6.4
9.5
12.7
15.9
R410A
R22
1.5 to 2.0
1.0 to 1.5
1.5 to 2.0
1.0 to 1.5
2.0 to 2.5
1.5 to 2.0
2.0 to 2.5
1.5 to 2.0
B
Work using double spanner
8
REFRIGERANT PIPING
