17 | Piping installation
Installer and user reference guide
68
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P561157-1B – 2021.11
H1
1
2
3
a
A
h i j k l m n
B C D E F G
pb c d e f
1 2 3 4 5 6 7
8
g
H2
1 Outdoor unit
2 Refnet joints (A~G)
3 Indoor units (1~8)
Conditions:
a The piping length between all indoor units to the nearest branch kit is ≤40m.
Example: h, i, j … p≤40m
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 40m.
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: unit8: b+c+d+e+f+g+p≤90m and b+c+d+e+f+g>40m; increase the
pipe size of b, c, d, e, f, g.
c When the piping size is increased (stepb), 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≤1000m (500m).
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 ≤40m.
Example: The farthest indoor unit 8. The nearest indoor unit 1 → (a+b+c+d+e
+f+g+p)–(a+h)≤40m.
17.1.7 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
Pattern 2
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