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10
05~17
※
※
※
22, 24
19
※ Since the nut cap connected at gas pipe is
designed exclusively for R410A, the piping flaring
connected for off-factory installation is adjusted as
compared with R22 and R407C. Please perform the
processing operation based on the dimensions shown
below: (See Fig. 5.3)
Outside Diameter of
Piping（a）
Outside
Diameter
of
Flaring (D)
R410A
45°±2°
90°±2°
a
D
5.2 Piping Connection
(1) Piping connection points are shown in Figs. 5.1 and 5.2.
Refrigerant
Liquid Pipe
Refrigerant
Gas Pipe
Drain Pipe (for
Drain Pump)
Fig. 5.1 Piping Connection Points
Indoor Unit Capacity (kBtu/h)
Gas Pipe
Liquid Pipe
Fig. 5.2 Pipe Size
Unit: in.
Fig. 5.3 Flaring
(2) As shown in Fig. 5.4, two spanners shall be used for
tightening the nut.
Pipe Size (inch(mm))
Tightening Torque (ft.·lbs(N.m))
Fig. 5.4 Nut Tightening Torque
(3) Insulate the refrigeration piping with field-supplied
insulating pipe upon completion of refrigerant pipe
connection. See Fig. 5.5.
Wire Tie (Option)
Insulating Pipe (Option)
Refrigerant Piping Work
(Field Supplied)
Insulating Pipe
(Field Supplied)
Thermal Insulation Material (Option)
Indoor Unit
Side
Fig. 5.5 Thermal Insulation of Pipes
！
Cap the end of pipe when the pipe is to be inserted
through a hole.
Do not put pipes on the ground directly without a cap or
vinyl tape at the end of the pipe.
Do not put pipes on the ground directly
Correct
Incorrect
Blocked with tape or plug
(4) Discharging and Charging Refrigerant
Follow the Installation & Maintenance Manual for
outdoor unit.
3-53/64
3-25/64
1-3/8
6-35/64
5-5/64
5-15/64
8-21/32
2-31/64
2-19/32
3-35/64
1/2(12.7)
5/8(15.88)
1/4(6.35)
1/4(6.35)
3/8(9.53)
41/64
21/32
49/64
25/32
1/4(6.35)
3/8(9.53)
1/2(12.7)
5/8(15.88)
Unit: in.
Unit: in.(mm)
5/8(15.88)
14.75(20)
29.50(40)
44.25(60)
59.00(80)
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