6
Reinforce the insulation material for the refrigerant piping if
the ambient temperature is high, or otherwise dew conden-
sation may result on the surface of the insulation material.
Make sure that the refrigerant is R410A before refrigerant
piping work. If the refrigerant is different, the air condi-
tioner will not operate normally.
This product uses new refrigerant (R410A) only. Be sure
to keep the items on the right hand side and conduct the
installation work.
•
Use an appropriate pipe cutter and flare tool for R410A.
•
•
•
When connecting the flare, apply ether oil or ester oil
only to inner side of the flare.
Be sure to use the flare nut provided with the unit. (Do
not use a different flare nut (such as a type-1 flare nut),
or otherwise refrigerant leakage may result.)
Perform the curing of the piping with pinching or taping
of the piping in order to prevent the intrusion of dirt,
dust, and moisture into the piping.
•
Be sure to use the specified type of refrigerant for the
refrigeration cycle and do not contaminate the refriger-
ant with air.
•
Ventilate the room in case of refrigerant leakage during
installation work.
•
The outdoor unit is filled with refrigerant.
• When connecting or disconnecting piping to or from the
unit,
be sure to use two spanners and two torque
wrenches. (Refer to Fig. 4)
•
Refer to Table 2 for the processing dimensions of the
flare.
•
Use the flare nut provided with the unit.
•
Apply ether oil or ester oil only to inner side of the flare
and screw in the flare nut three to four turns first by hand at
the time of connecting the flare nut.
(Refer to Fig. 5)
•
Refer to Table 2 for the corresponding tightening torque.
Table 2
•
Do not excessively tighten the flare nut.
Doing so will break the flare nut and refrigerant leakage may
occur.
•
Make sure that all parts around the flare are free of oil.
The drain pan and the resin part may be deteriorated if oil is
attached.
•
If no torque wrenches are available, refer to Table 3 as
a
standard.
When the flare nut is tightened with the spanner, the
tightening torque should increase suddenly. Tighten the
flare
nut further for the corresponding angle shown in
Table 3.
Table 3
Torque wrench
Spanner
Piping union
Flare nut
Fig. 4
Pipe
size
Tightening torque
Flare
dimensions
A (mm)
Flare shape
φ
6.4
14.2 – 17.2N·m
8.7 – 9.1
φ
9.5
32.7 – 39.9N·m
12.8 – 13.2
φ
12.7
49.5 – 60.3N·m
16.2 – 16.6
φ
15.9
61.8 – 75.4N·m
19.3 – 19.7
Pipe size Further tightening angle
Recommended arm length of
tool
φ
6.4
60 to 90 degrees
Approx. 150mm
φ
9.5
60 to 90 degrees
Approx. 200mm
φ
12.7
30 to 60 degrees
Approx. 250mm
φ
15.9
30 to 60 degrees
Approx. 300mm
Fig. 5
Apply ester oil or ether
oil only to inner side of
flare.
A
45
0
±2
0
R0.4-0.8
90
0
±2
0
Fig. 6
Heat insulation procedure for gas piping
Insulation material
for piping
(on unit side)
Insulation material
for piping (field supply)
Make sure that
the seam faces
upward.
Clamp (7
(accessory)
Gas pipe
Liquid pipe
Flare nut joint
Attached to
the surface.
Insulation for fitting (4) (accessory)
Middle sealing pad (6)
(accessory)
Wrap the insulation material
around the portion from the
surface of the main unit to the
upper part of the flare nut joint.
Insulation material
for piping (field supply)
Wrap the insulation material
around the portion from the
surface of the main unit to the
upper part of the flare nut joint.
Heat insulation procedure for liquid piping
Insulation material
for piping
(on unit side)
Make sure that
the seam faces
upward.
Clamp (
7
)
(accessory)
Main unit
Flare nut joint
Attached to
the surface.
Insulation for fitting (3)(accessory)
Middle sealing pad (6)
(accessory)
•
!
CAUTION
(2) On completion of installation work,
check that there is no gas
leakage.
(3) Refer to the illustration on the right hand side and be sure to
perform heat insulation work on the piping joints after gas leakage
checks. (Refer to Fig. 6)
•
!
CAUTION
