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(Unit: N•m)
Outer dia. of copper pipe
Tightening torque
9.5 mm (dia.)
34 to 42 (3.4 to 4.2 kgf•m)
15.9 mm (dia.)
68 to 82 (6.8 to 8.2 kgf•m)
Cover
Cap
Piping valve
Loosened
Tightened
Flare nut
Valve at gas side
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.
Cover
Incorrect
Cap
• 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.
Refrigerant pipe length
Single
Allowable pipe length (m)
Total length L
50
Pipe diameter (mm)
Gas side
Ø15.9
Simultaneous twin, triple
Allowable pipe length (m)
Distributed
Total length
pipes
ℓ
+ ℓ
System
1
2
ℓ
2
ℓ
+ ℓ
1
3
ℓ
3
ℓ
+ ℓ
1
4
ℓ
4
Maximum
Maximum
TWIN
50
TRIPLE
50
System
Main pipe
Gas side
TWIN
Ø15.9
TRIPLE
Ø15.9
Figure of Single
Figure of simultaneous twin
Indoor unit
Outdoor unit
Outdoor unit
– 8 –
Height difference (Indoor-outdoor H) (m)
Indoor unit: Upper
Outdoor unit: Lower
30
Number of bent portions
Liquid side
Ø9.5
Height difference (m)
Distributed
(Indoor-outdoor H)
pipes
ℓ
– ℓ
3
2
Indoor unit:
Outdoor unit:
ℓ
– ℓ
4
2
Upper
Lower
ℓ
– ℓ
4
3
Maximum
15
10
30
15
10
30
Pipe diameter (mm)
Branching pipe
Liquid side
Gas side
Liquid side
Ø9.5
Ø15.9
Ø9.5
Ø9.5
Ø12.7
Ø6.4
Figure of Simultaneous triple
Indoor unit
Indoor unit
Indoor unit
Distributor
Outdoor unit
2
2
3
1
30
10 or less
Indoor-Indoor
(∆h)
30
0.5
30
0.5
Number of bent
portions
10 or less
10 or less
Indoor unit
Indoor unit
4
3
Distributor
1
EN
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