3 INSTALL
ING
THE REFRIGERANT PIPE
Execute heat insulation work completely on both sides of the gas
piping and liquid piping. Otherwise, water leakage
may result
.
(When using a heat pump, the temperature of the gas piping can
reach approximately 120
O
C/
248
O
F. Use insulation
that
is
sufficiently
resistant.)
All field piping must be provided by a licensed refrigeration
technician and must comply with the relevant local and
national codes.
Coat the flare both inside and ou
t
side with ether oil or ester oil.
9
Coat here with ether oil or ester oil
Precautions
3.1 Flaring the pipe end
1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing downward so that the
chips do not enter the pipe.
5)
Ensure
that the flaring is
made
properly.
B
efore rigging tubes, check which type of refrigerant is used.
Use a pipe cutter and flare suitable for
the
refrigerant.
Only use annealed material for flare conn
e
ctions.
Do not mix anything other than the specified refrigerant, such as
air,
i
nside the refrigerant circuit.
If refrigerant gas leaks
while you are working
, ventilate the area.
T
oxic gas
may be
emitted
when
the
refrigerant gas
is
exposed to
a
fire.
Make sure there is no refrigerant gas leak.
T
oxic gas may be
released
when
the refrigerant gas
is
exposed to flames from an
area heater, cooking stove, etc.
Refer to the table below for the dimensions of flare nut spaces
and the appropriate tightening torque. (Over
-
tightening may
damage the flare and cause leaks.)
Pipe gauge
(mm)
Outer diam.
(mm)
Tightening torque
A
(mm)
Max.
1.3
1.6
1.8
2.2
Min.
0.7
1.0
1.0
2.0
Flare dimension
A (mm)
Flare shape
O
6.35
(1/4 in)
O
6.35
(1/4 in)
15
-
16 N. m
(153
-
163 kgf.
cm)
8.3
-
8.7
0.327
-
0.343
in
12.0
-
12.4
0.472
-
0.488
in
15.4
-
15.8
0.606
-
0.622
in
18.6
-
19.0
0.732
-
0.748
in
25
-
26 N. m
(255
-
265 kgf.
cm)
35
-
36 N. m
(357
-
367 kgf.
cm)
45
-
47 N. m
(459
-
480 kgf.
cm)
O
9.52
(3/8
in)
O
9.52
(3/8
in)
O
12.7
(1/2
in)
O
12.7
(1/2
in)
O
15.9
(5/8
in)
O
15.9
(5/8
in)
R0.4
-
0.8
45
2
90
4
A
o
o
1 Torque wrench
2 Flare nut
3 Piping union
4 Spanner
1
2
3 4
Align the cent
e
rs of both flares and tighten the flare nuts 3 or 4
turns by hand. Then tighten them fully with the torque wrenches.
3.2 Refrigerant piping
Ensure
that
the height drop between the indoor and outdoor unit
s
and the length of
the
refrigerant pipe meet the following
requirements:
Capacity
(Btu/h)
Type
s
of models
Max.
allowable
piping length
15
m
(
49.2
ft
)
25
m
(
82
ft
)
25
m
(
82
ft
)
25
m
(
82
ft
)
9K
-
12K
9K
-
12K
9K
-
12K
9K
-
12K
T1 condition
Split
-
type air conditioner
R410A inverter
Split
-
type air conditioner
T3 condition
(outdoor unit down)
T3 condition
(outdoor unit up)
Max.
allowable
piping height
8
m
(
26.2
ft
)
10
m
(
32.8
ft
)
10
m
(
32.8
ft
)
15
m
(
49.2
ft
)
25
m
(
82
ft
)
30
m
(
98.4
ft
)
30
m
(
98.4
ft
)
30
m
(
98.4
ft
)
18K
18K
18K
18K
15
m
(
49.2
ft
)
20
m
(
65.6
ft
)
15
m
(
49.2
ft
)
20
m
(
65.6
ft
)
Cut exactly at
right angles
Remove burrs
must be flaw-free
.
The f
lare
'
s inner surface
The pipe end must
be evenly flared in a
perfect circle
.
Make sure that the
flare nut is fitted
.
Die
Copper pipe
A
Set exactly at the position shown below.
3)
Put the flare nut on the pipe.
4)
Flare the pipe.
(in
=
25.4
mm)
0.016
-
0.031
in
I
n cases
w
here the te
m
perat
u
re an
d
h
um
i
d
ity o
f
the
re
f
rigerant
piping sections
m
ight excee
d
30
O
C/86
O
F
or
R
h
80%,
rein
f
orce
the re
f
rigerant ins
u
lation
(0
.
8
in
(20 mm)
or thic
k
er
)
.
C
on
d
ensation
m
ay
f
or
m
on the s
u
r
f
ace o
f
the ins
u
lating
m
aterial.
