Panasonic U-16GE2E5 Test Run Manual page 5

(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.
Outdoor Tubing/Main Tube Size
45
Gas tube (mm)
φ 12.7
Liquid tube
( φ 15.88)
(mm)
(*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)
Size of main tubing after branch
When indoor unit(s) are connected
– 5.6
Gas tube
φ 12.7
(mm)
Liquid tube
(mm)
(*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".
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
Over 72.8 kW
Over 45.0 kW to 72.8 kW
Over 35.5 kW to 45.0 kW
Over 28.0 kW to 35.5 kW
Over 22.4 kW to 28.0 kW
Over 16.0 kW to 28.0 kW
Over 5.6 kW to 16.0 kW
5.6 kW or below
(*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.
(*1) (*2)
Outdoor tubing
56 71
φ 28.58 ( φ 31.75)
φ 15.88 ( φ 19.05)
( 1) ( 2)
* *
Post-branching indoor unit capacity (kW)
– 16.0 – 22.4 – 28.0
φ 15.88 φ 19.05 φ 22.22
φ 9.52
Branch tube size
Gas tube (mm) Liquid tube (mm)
φ 31.75
φ 28.58
φ 28.58
φ 25.4
φ 22.22
φ 19.05
φ 15.88
(*2)
φ 12.7
Outdoor unit (gross) capacity (kW)
85 90
φ 31.75 ( φ 38.1)
– 16.0 – 28.0 – 35.5
φ 15.88 φ 22.22 φ 25.4
( φ 19.05) ( φ 25.4) ( φ 28.58)
φ 9.52 ( φ 12.7) φ 12.7 ( φ 15.88)
(*1)
APR-P160BG
φ 19.05
—
φ 15.88
—
φ 12.7
—
φ 12.7
—
φ 9.52
—
φ 9.52
●
φ 9.52
●
φ 9.52
●
I - 3
Main tubing
101 112 116
φ 38.1
φ 19.05 ( φ 22.22)
Main tube after branching
*3
– 45.0 – 71.0 – 101.0
φ 31.75
φ 28.58 ( φ 31.75)
( φ 38.1)
φ 15.88
φ 19.05 ( φ 22.22)
( φ 19.05)
Branch tube number
Branch tubing
APR-P680BG APR-P1350BG
—
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(*3)
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(*3)
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127 142
Over
101.0
φ 38.1
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(*3)
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(*3)
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