– 13 –
Tightening of connecting part
1
Align the centers of the connecting pipes
and fully tighten the flare nut with your
fingers. Then fix the nut with a wrench as
shown in the figure and tighten it with a
torque wrench.
2
As shown in the figure, be sure to use two
wrenches to loosen or tighten the flare nut of
the valve on the gas side. If you use a single
crescent, the flare nut cannot be tightened to
the required tightening torque.
On the other hand, use a single crescent to loosen
or tighten the flare nut of the valve on the liquid
side.
(Unit: N
m)
CAUTION
Do not put the crescent wrench on the cap or cover.
The valve may break.
If applying excessive torque, the nut may break
according to some installation conditions.
Outer dia. of copper pipe
Tightening torque
9.5 mm (dia.)
34 to 42 (3.4 to 4.2
NJIP
15.9 mm (dia.)
68 to 82 (6.8 to 8.2
NJIP
Half union or packed valve
Flare nut
Internally
threaded side
Externally
threaded side
Fix with wrench.
Tighten with torque
wrench.
Flare nut
Piping valve
Cap
Tightened
Loosened
Valve at gas side
Cover
In correct
Cap
Cover
Refrigerant pipe length
Single
Simultaneous twin
t
h
g
i
e
H
)
m
(
h
t
g
n
e
l
e
p
i
p
e
l
b
a
w
o
l
l
A
difference (Indoor-outdoor H) (m)
r
e
p
p
U
:
t
i
n
u
r
o
o
d
n
I
L
h
t
g
n
e
l
l
a
t
o
T
Outdoor unit: Lower
0
3
0
3
0
5
Pipe diameter (mm)
Number of bent portions
e
d
i
s
d
i
u
q
i
L
e
d
i
s
s
a
G
s
s
e
l
r
o
0
1
5
.
9
Ø
9
.
5
1
Ø
System
Model
Allowable pipe length (m)
Height difference (m)
Total length
Ɛ
1 +
Ɛ
2
Ɛ
1 +
Ɛ
3
Ɛ
1 +
Ɛ
4
Maximum
Distributed
pipes
Ɛ
2
Ɛ
3
Ɛ
4
Maximum
Distributed
pipes
Ɛ
3 –
Ɛ
2
Ɛ
4 –
Ɛ
2
Ɛ
4 –
Ɛ
3
Maximum
Indoor-outdoor H
Indoor-
indoor (
ǻ
h)
Indoor unit:
Upper
Outdoor
unit: Upper
TWIN
50
15
10
30
30
0.5
50
15
10
30
30
0.5
System
Model
Pipe diameter (mm)
Number of
bent
portions
Main pipe
Branching pipe
Gas side
Liquid side
Gas side
Liquid side
TWIN
Ø15.9
Ø9.5
Ø12.7
Ø6.4
10 or less
M140
Ø15.9
Ø9.5
Ø15.9
Ø9.5
10 or less
GM110
GM140
GM110
G
Indoor unit
Outdoor unit
Figure of Single
L
H
Indoor unit
Outdoor unit
Figure of Simultaneous twin
ǻ
h
H
Distributor
Ɛ
2
Ɛ
3
Ɛ
1
$IWHUWKHLQVWDOODWLRQZRUNEHVXUHWRFKHFNIRUJDV
leaks of the pipe connections with nitrogen.
7KHUHIRUHXVLQJDWRUTXHZUHQFKWLJKWHQWKHIODUH
pipe connecting sections that connect the indoor/
outdoor units at the specified tightening torque.
Incomplete connections may cause not only a gas
leak, but also trouble with the refrigeration cycle.
Do not apply refrigerating machine oil to the
flared surface.
25-EN
26-EN
