EN - 6
Table 1-4 Branch/Header Tube Selection
Use the following branch tubing sets or tubing sets for branching the system’s main tube and indoor unit
tubing.
Capacity after branch
Branch tube size
(*1)
Branch tube number
Gas tube (mm)
Liquid tube (mm)
Branch tubing
APR-P160BG
APR-P680BG
APR-P1350BG
Over 72.8 kW
Ø31.75
Ø19.05
―
―
●
Over 45.0 kW to 72.8 kW
Ø28.58
Ø15.88
―
●
●
Over 35.5 kW to 45.0 kW
Ø28.58
Ø12.7
―
●
●
Over 28.0 kW to 35.5 kW
Ø25.4
Ø12.7
―
●
●
Over 16.0 kW to 28.0 kW
Ø22.22
Ø9.52
―
●
●
Over 5.6 kW to 16.0 kW
Ø15.88
Ø9.52
●
●
(*3)
●
(*3)
5.6 kW or below
Ø12.7
(*2)
Ø9.52
●
●
(*3)
●
(*3)
(*1) Make a selection so as not to exceed the main tubing size.
(*2) Even when 5.6 kW or below, make the gas tube diameter Ø15.88 if 2 or more indoor units are connected after
branching.
(*3) As the tube diameter for the supplied reducer does not match, another reducer must be provided by the installer.
Table 1-5 Tubes Connecting Outdoor Units and Indoor Units
Outdoor Units
Tubing connecting to
outdoor units (
ℓ
A to
ℓ
B)
Unit type
45.0 kW
56.0 kW
71.0 kW
81.0 kW
Equivalent horsepower
16
20
25
30
Tube size
Gas tube (mm)
Ø28.58
Ø31.75
Liquid tube (mm)
Ø12.7
Ø15.88
Ø19.05
Indoor Units
Tubing
connecting to
indoor units
(
ℓ
A to
ℓ
B)
Unit type
22
28
36
45
56
71
80
90
112
140
160
224
280
Tube size
Equivalent horsepower
0.8
1
1.3
1.6
2
2.5
3
3.2
4
5
6
8
10
Gas tube (mm)
Ø12.7
Ø15.88
Ø22.22
Ø25.4
Liquid tube (mm)
Ø6.35
Ø9.52
Ø12.7
Note: Keep the maximum length between
ℓ
1 to
ℓ
48 within 30 m.
1. LM: Main tube with largest tubing diameter (includes LA and all post-branch main tubes that are identical in size to LA)
≤
120 m.
2. Select the sizes for post-branching main tubes after LM (LB, LC, ...) based on the post-branching capacity.
3. The sizes for the indoor unit connection tubing (
ℓ
1 to
ℓ
48) depend on the tubing diameter for the indoor unit.
When T-tee branch tubing is
used (header branch method)
No. 1 branch
40 cm or less
40 cm or less
Used for
expansion
Symbols
Branch tube
(APR purchased separately)
Ball valve (purchased separately)
T-tee (provided by installer)
Closed (pinch) weld
ᲢˌϋᲣ
ᲢˌϋᲣ
Maximum height differential of indoor units
after
fi
nal branch
Four meters is the maximum height differential
between indoor units after the last branch.
If exceeding the 4 m of height between indoor units
after a
fi
nal branch cannot be helped, split the
difference between rise and fall (2:1).
4 m or less
(within
α
)
More than
4 m
(within
α
)
Fig. 5 Length of Refrigerant Tubing
2X m
or more
X m
00-Installation̲All.indb 6
00-Installation̲All.indb 6
2012/09/07 9:32:38
2012/09/07 9:32:38
