Johnson Controls YVAHP0721CW Series, Service Manual

Page: 57 / 416

SM-16007
1-43
INSTALLATION
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In the following instances, there is no limit to the number of main piping branches.
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(Example 1) : Installation with Main Piping Branch (
7
)
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90m).
(1) If the pipe length L2 is over 131.2 ft (40m), the size of gas and liquid pipes “b and c” or “g and h”
should be selected according to Table 4 below, “Diameter of Pipe after First Branch”.
* If the size of (a) is smaller than the size of (b, g) after selecting the size according to Table 4 below,
“Diameter of Pipe after First Branch”, adjust the size of (a) so it is the same size as (b, g).
If the size of (a) is larger than the size indicated in Table
3 below, “Main Pipe Diameter” of (Equivalent
Piping Length > 328.1ft), adjust the size of (a) so it is the same size according to Table 3 below, “Main
Pipe Diameter” of (Equivalent Piping Length > 328.1ft).
In this instance, if the size of (b, c, g, h) is larger than the size of each before the branch, adjust the
size of (b, c, g, h) to the same size as each before the branch.
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* (g+h+j)-(b+d)<131.2 ft (40m)
(Example 2): Installation without Main Piping Branch (
7
)
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90m).
(1) If the pipe length L2 is over 131.2 ft (40m), the size of gas and liquid pipes “b, d and f” should be
selected according to Table 4 below, “Diameter of Pipe after First Branch”.
* If the size of (a) is smaller than the size of (b) after selecting the size according to Table 4 below,
“Diameter of Pipe after First Branch”, adjust the size of (a) so it is the same size as (b).
If the size of (a) is larger than the size indicated in Table
3 below, “Main Pipe Diameter” of (Equivalent
Piping Length > 328.1ft), adjust the size of (a) so it is the size according to Table 3 below, “Main
Pipe Diameter” of (Equivalent Piping Length > 328.1ft).
In this case, if the size of (b, d, f) is larger than the size of each before the branch, adjust the size of (b,
d, f) to the same size as each before the branch.
(
7
): Main Piping Branch:
Both branches of piping from a Multi-Kit are
connected to the next Multi-Kits.
L2
b
a
d
c e
g
i
f
h
Piping Length from the Multi-Kit at the first branch
to the terminal Indoor Unit is within 131.2 ~ 295.3 ft
First Branch
Multi-Kit
Terminal
Indoor Unit
The Farthest Indoor Unit
from the First Branch The Closest Indoor Unit
from the First Branch
b
a
First Branch
c
e
d f
i
j
k
h
g
Terminal
Indoor Unit
Terminal
Indoor Unit
Piping Length from the Multi-Kit at the first branch
to the terminal Indoor Unit is within 131.2 ~ 295.3 ft
Multi-Kit
The Closest Indoor Unit
from the First Branch
ࠉ
The Farthest Indoor Unit
from the First Branch
ࠉ
L2
L2
Indoor Unit
Main Branch
a b
c
e
f
d