I - 3
(2) Selecting system header and branch tubing sizes
Outdoor and indoor units are connected together by a pair of headers.
If the maximum tubing length exceeds 90 m (effective length), increase the size of the main tubing for both liquid
and gas by one size. Be careful when selecting tube sizes, as the wrong size may impair performance.
c
Outdoor Tubing/Main Tube Size
(*1) (*2)
Outdoor tubing
Main tubing
Outdoor unit (gross) capacity (kW)
45
56
71
85
90
101
112
116
127
142
Gas tube (mm)
φ
28.58 (
φ
31.75)
φ
31.75 (
φ
38.1)
φ
38.1
Liquid tube
(mm)
φ
12.7
(
φ
15.88)
φ
15.88 (
φ
19.05)
φ
19.05 (
φ
22.22)
(*1) If there are plans for future expansion, choose plumbing sizes according to the total capacity after such expan-
sion. However, if tube size is stepped up 3 levels, expansion is not possible.
(*2) If the maximum tube length exceeds 90 m (or equivalent length), use the
fi
gure in parentheses ( ) to size the
main tubing, along with those of the liquid and gas tubes.
However, size the gas tube only up to
φ
38.1. (A reducer has to be
fi
tted on-site)
d
Size of main tubing after branch
(
*
1) (
*
2)
When indoor unit(s) are connected
Main tube after branching
Post-branching indoor unit capacity (kW)
*3
– 5.6
– 16.0
– 22.4
– 28.0
– 16.0
– 28.0
– 35.5
– 45.0
– 71.0
– 101.0
Over
101.0
Gas tube
(mm)
φ
12.7
φ
15.88
φ
19.05
φ
22.22
φ
15.88
(
φ
19.05)
φ
22.22
(
φ
25.4)
φ
25.4
(
φ
28.58)
φ
28.58 (
φ
31.75)
φ
31.75
(
φ
38.1)
φ
38.1
Liquid tube
(mm)
φ
9.52
φ
9.52 (
φ
12.7)
φ
12.7 (
φ
15.88)
φ
15.88
(
φ
19.05)
φ
19.05 (
φ
22.22)
(*1) Select a diameter for the main tubing after a branch that is no larger than that of the header.
(In cases where the main tubing after a branch would have to be larger than the header tubing, select tubing of
the same size, and never exceed the header size.)
(*2) If the maximum tube length exceeds 90 m (or equivalent length), use the
fi
gure in parentheses ( ) to size the
main tube after branching, along with those of the liquid and gas tubes.
However, size the gas tube only up to
φ
38.1.
(*3) “–* *” in the table above means “** kW or less”.
e
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
φ
31.75
φ
19.05
—
—
●
Over 45.0 kW to 72.8 kW
φ
28.58
φ
15.88
—
●
●
Over 35.5 kW to 45.0 kW
φ
28.58
φ
12.7
—
●
●
Over 28.0 kW to 35.5 kW
φ
25.4
φ
12.7
—
●
●
Over 22.4 kW to 28.0 kW
φ
22.22
φ
9.52
—
●
●
Over 16.0 kW to 28.0 kW
φ
19.05
φ
9.52
●
●
●
Over 5.6 kW to 16.0 kW
φ
15.88
φ
9.52
●
●
(*3)
●
(*3)
5.6 kW or below
φ
12.7
(*2)
φ
9.52
●
●
(*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
φ
15.88 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.
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