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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.
Half union or packed valve
Flare nut
Internally
Externally
threaded side
threaded side
Tighten with torque
Fix with wrench.
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.
Outer dia. of copper pipe
Tightening torque
9.5 mm (dia.)
33 to 42 (3.3 to 4.2 kgf·m)
19.1 mm (dia.)
100 to 120 (10.0 to 12.0 kgf·m)
Cover
Cap
Piping valve
Loosened
Tightened
Flare nut
Valve at gas side
25-EN
1121901101.indd 14
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.
Incorrect
Cap
Incorrect
(Unit : N·m)
Ball valve of discharge gas side
Do not clamp the service port
with two spanners, doing so may
damage the service port.
• After the installation work, be sure to check for gas
leaks of the pipe connections with nitrogen.
• Therefore, using a torque wrench, tighten the flare
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.
– 13 –
Refrigerant pipe length
l A
o l
w
a
b
e l
p
p i
e
e l
n
g
h t
(
m
T
t o
l a
e l
n
g
h t
L
5
0
Cover
Pipe diameter (mm)
G
a
s
s
d i
e
Ø19.1
Example :
)
H
e
g i
t h
difference (Indoor-outdoor H) (m)
n I
d
o
r o
u
n
: t i
U
p
p
r e
3
0
Number of bent portions
L
q i
u
d i
s
d i
e
Ø
9
5 .
Indoor Unit
Outdoor Unit
Outdoor unit: Lower
3
0
1
0
r o
e l
s s
26-EN
10/1/2562 11:10:12
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