Unit Side
Refrigeration Piping
(Field-Supplied)
Insulating Pipe
(Field-Supplied)
Cord Clamp
(Factory-Supplied)
Insulating Pipe
(Field-Supplied)
Fig. 5.1 Pipe Connection Points
Fig. 5.2 Pipe Diameter
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)
Unit: mm (in.)
(2) As shown in Fig. 5.4, two spanners shall be used for
tightening the nut
Insulating Pipe
Cap the end of the pipe when the pipe is to
penetrate a hole.
Do not put pipes on the ground directly without a
cap or vinyl tape arranged 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.
Excessive and inadequate refrigerant is a leading
cause of system anomaly.
Please inject the right amount of refrigerant.
Pipe Size
Tightening Torque (N.m)
20
40
60
80
Φ15.88
Φ12.7
Φ9.53
Φ6.35
Outside Diameter of
Piping (a)
Outside
Diameter
of Flaring
(D)
R22, R407C
R410A
16.2
16.6
19.4
19.7
Φ12.7
(1/2)
Φ15.88
(5/8)
Fig. 5.3 Flaring
5.2 Piping Connection
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.
Fig. 5.5 Insulation on Pipes
90
0
±2
0
45
0
R0.4~0.8
a
D
0
-0.4
±2
0
CAUTION
CAUTION
●
●
5
(1) The connection point and diameter of piping
are shown in Figs. 5.1 and 5.2.
Unit: mm (in.)
Refrigerant
Liquid
Tube
Refrigerant
Gas
Tube
Drain Pipe
for Drain Pump
Indoor Unit Capacity (HP)
Gas Tube
Liquid Tube
0.8~1.5
1.8~2.0
2.3~2.5
