7
3P130768-6L English
Table 1
•
When connecting the flare nut, coat the flare section (both
inside and outside) with ester oil or ether oil, rotate three or
four times first, then screw in.
(Refer to Fig. 12)
•
Refer to the “Table 1” for tightening torque.
CAUTION
Over-tightening may damage the flare and cause a
refrigerant leakage.
•
If a torque wrench is not available, tighten the nut in the fol-
lowing manner. Once work is complete, make sure there is
no gas leaking. As the flare nut is tightened with the wrench,
the torque will suddenly increase. From that position, tighten
the nut to the angle shown on “Table 2”.
Table 2
•
After the work is finished, make sure to check that there is no
gas leak.
•
After checking the pipe-connection for gas leakage, be sure
to insulate the liquid and gas piping.
(Refer to Fig. 13)
Precautions for insulation material installation on flare nut
connection
(1) Make sure that the piping insulation material comes in close
contact with the base so that there will be no air passage at
the edges of the piping insulation material.
(2) Do not tighten the clamp excessively so as to maintain the
appropriate thickness of the insulator.
(3)Wrap the sealing material around the upper
part of the flare nut connection.
(4)Turn the seams up (see the figure on the
right-hand side).
CAUTION
Be sure to insulate any field piping all the way to the piping
connection inside the unit. Any exposed piping may cause
condensation or burns if touched.
•
Connect refrigerant piping and branching according to the
attached installation manuals that come with the outdoor unit.
•
When brazing the refrigerant piping, perform nitrogen
replacement first, or perform the brazing (note 2) while feed-
ing nitrogen into the refrigerant piping (note 1), and finally
connect the indoor unit using the flare connections.
(Refer to Fig. 14)
CAUTION
•
When brazing a pipe while feeding nitrogen inside the pipe,
make sure to set the nitrogen pressure to 0.02 MPa
(0.2 kg/cm
2
) or less using the pressure reducing valve.
(This pressure is such that breeze is blown to your cheek.)
•
Do not use a flux when brazing the refrigerant pipe joints.
Use phosphor copper brazer (BCuP-2: JIS Z 3264/B-
Cu93P-710/795: ISO 3677) which does not require flux.
(Using a flux containing chlorine may cause the piping to
corrode. Using a welding flux containing fluorine may
cause the refrigerant lubricant to deteriorate, and affect
adversely the refrigerant piping system.)
•
Do not use anti-oxidants or other similar agent when braz-
ing the pipe joints.
Residue can clog the pipes and may cause breakdown of
parts.
Pipe
gauge
Tightening torque
Flare dimen-
sion A (mm)
Flare shape
6.4
14.2–17.2 N·m
8.7 – 9.1
12.7
49.5–60.3 N·m
16.2 – 16.6
Pipe size
Further tightening angle
Recommended arm
length of tool
6.4 (1/4”)
60 to 90 degrees
Approx. 150 mm
12.7 (1/2”)
30 to 60 degrees
Approx. 250 mm
A
45
0
Ⳳ
2
0
R0.4-0.8
90
0
Ⳳ
2
0
Torque wrench
Spanner
Piping union
Flare nut
Fig. 11
Ester oil or ether oil
Fig. 12
G
as
Piping In
su
l
a
tion Proced
u
re
Li
qu
id Piping In
su
l
a
tion Proced
u
re
(2) Cl
a
mp
(Acce
ss
ory)
(2) Cl
a
mp
(Acce
ss
ory)
Fl
a
re n
u
t
connection
Piping in
su
l
a
tion m
a
teri
a
l
(Loc
a
lly proc
u
red)
Fl
a
re n
u
t connection
(4) T
u
rn
s
e
a
m
s
u
p
Mid
s
e
a
ling p
a
d
(
3
) Wr
a
p over the
top of the fl
a
re
n
u
t connection.
(Acce
ss
ory)
(4) T
u
rn
s
e
a
m
s
u
p
Piping in
su
l
a
tion m
a
teri
a
l
(Loc
a
lly proc
u
red)
Piping in
su
l
a
tion
m
a
teri
a
l (M
a
in
u
nit)
Piping in
su
l
a
tion
m
a
teri
a
l (M
a
in
u
nit)
(1) Att
a
ch to
bas
e
(1) Att
a
ch to
bas
e
M
a
in
u
nit
M
a
in
u
nit
In
su
l
a
tion for fitting (Acce
ss
ory)
In
su
l
a
tion for fitting
(Acce
ss
ory)
G
as
pipe
Li
qu
id
pipe
Fi
g
. 1
3
Model
Gas piping
diameter
Liquid piping
diameter
VKM50GBMV1, VKM50GBV1
VKM80GBMV1, VKM80GBV1
VKM100GBMV1, VKM100GBV1
12.7
6.4
Seams up
Refriger
a
nt piping
P
a
rt to
b
e
b
r
a
zed
T
a
ping
Pre
ssu
re-
red
u
cing v
a
lve
H
a
nd
s
v
a
lve
Nitrogen
Nitrogen
Fi
g
. 14
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