5 Preparation
Installer and user reference guide
16
RXYTQ8~16U7YF
VRV IV+ heat pump for high ambient temperatures
4P561157-1 – 2018.09
However, extension is possible if all below conditions are met. In this
case limitation can be extended up to 90 m.
a
A
h
i
j
k
l
m
n
B
C
D
E
F
G
p
b
c
d
e
f
1
2
3
4
5
6
7
8
g
H1
H2
1
2
3
1
Outdoor units
2
Refnet joints (A~G)
3
Indoor unit (1~8)
Conditions:
a
The piping length between all indoor units to the nearest branch
kit is ≤40 m.
Example: h, i, j … p≤40 m
b
It is necessary to increase the pipe size of the gas and liquid
piping if the pipe length between the first branch kit and the
farthest indoor unit is over 40 m.
If the increased pipe size is larger than the pipe size of the main
pipe, then the pipe size of the main pipe has to be increased as
well.
Increase the pipe size as follows:
9.5 → 12.7; 12.7 → 15.9; 15.9 → 19.1; 19.1 → 22.2; 22.2 →
25.4
(a)
; 28.6 → 31.8
(a)
; 34.9 → 38.1
(a)
(a)
If the size-up size is NOT available, you must use the
standard size. Sizes bigger than the size-up size are NOT
allowed. But even if you use the standard size, you can
increase the maximum allowable length after the first branch if
all other conditions are met.
Example: unit 8: b+c+d+e+f+g+p≤90 m and b+c+d+e+f
+g>40 m; increase the pipe size of b, c, d, e, f, g.
c
When the piping size is increased (step b), the piping length
has to be counted as double (except for the main pipe and the
pipes that are not increased in pipe size).
The total piping length has to be within limitations (see table
above).
Example: a+b×2+c×2+d×2+e×2+f×2+g×2+h+i+j+k+l+m+n
+p≤1000 m (500 m).
d
The piping length difference between the nearest indoor unit
(from first branch) to the outdoor unit and the farthest indoor
unit to the outdoor unit is ≤40 m.
Example: The farthest indoor unit 8. The nearest indoor unit 1
→ (a+b+c+d+e+f+g+p)–(a+h)≤40 m.
5.3.6
Multiple outdoor units: Possible layouts
▪ The piping between the outdoor units must be routed level or
slightly upward to avoid the risk of oil retention into the piping.
Pattern 1
a
b
b
a
Pattern 2
b
a
a
b
a
b
b
aa
a
To indoor unit
b
Piping between outdoor units
X
Not allowed (oil remains in piping)
O
Allowed
▪ To avoid the risk of oil retention to the outmost outdoor unit,
always connect the stop valve and the piping between outdoor
units as shown in the 4 correct possibilities of the figure below.
a
b
b
b
a
b
b
b
a
b
a
b
a
b
a
a
a
≥200 mm
a
To indoor unit
b
Oil collects to the outmost outdoor unit when the system
stops
X
Not allowed
O
Allowed
▪ If the piping length between the outdoor units exceeds 2 m, create
a rise of 200 mm or more in the gas line within a length of 2 m
from the kit.
If
Then
≤2 m
a
b
≤2 m
>2 m
a
≤2 m
≤2 m
≥200 mm
≥200 mm
b
>2 m
>2 m
a
To indoor unit
b
Piping between outdoor units
Содержание VRV IV+ RXYTQ8U7YF
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