EAS Electric VRV Installation And Owner's Manual page 35

5.5 Examples
Outdoor unit
(450)
L
2
L
B
1
A
L
3
First manifold
C
CAUTION
Suppose in the displayed piping system, the total equivalent
piping length of air side + liquid side is longer than 90m.
1. Indoor unit branch pipe
Inner branch pipes are a~f, the size selection please refers to
Table 5-6. Note: The max. length of the branch pipe should not
longer than 15m.
2. The main pipes of indoor unit and the indoor unit branch pipe
components
Allowable length and altitude difference of refrigerant pipe
Total Pipe Length(Actual)
Maximum
Piping(L)
Pipe Length(from the first line branch
pipe to the furhtest indoor unit)(m)
33.5 kW
40 kW
Pipe Length(from the nearest branch
45 kW
pipe equivalent length(m)
Indoor Unit-Outdoor
Unit Drop Height(H)
Indoor Unit to Indoor Unit Drop Heihgt(H)
When the total equivalent piping length of liquid + gas side is ≥90m, it must increase the size of air side main pipe.
Besides, according to the distance of refrigerant pipe and the over matched state of inner unit, when the capacity is decreasing it still can
increase the gas side main pipe size.
N
1
(80)
a
Indoor unit
b N
2
(80)
N
3
(71)
c
L
4
N
D
4
(71)
d
L
5
e
E
f
N
5
(71)
Fig.5-5
Actual Length
Equivalent Length
Outdoor Unit up
Indoor Unit Down
The downstream inner units of the main pipe L2 are N1, N2, and
its total capacity is 80×2=160, the size of pipe L2 isΦ15.9/Φ9.5,
and the branch pipe B should be EVRI-BP1.
The downstream inner units of the main pipe L4 are N3, N4, and
its total capacity is 71×2=142, the size of pipe L4 isΦ15.9/Φ9.5,
and the branch pipe D should be EVRI-BP1.
The downstream inner units of the main pipe L5 are N5, N6, and
its total capacity is 71×2=142, the size of pipe L5 isΦ15.9/Φ9.5,
and the branch pipe E should be EVRI-BP1.
The indoor unit below to the main pipe L3 are N3～N6, and its
total capacity is 71×4=284, the size of pipe L3 isΦ22.2/Φ9.5, and
he branch pipe C should be EVRI-BP2.
The indoor unit below to the main pipe A are N1～N6, and its
total capacity is71×4+80×2=444, and the branch pipe should be
EVRI-BP2, and because the total piping length of liquid + air side
is ≥90m, check Table.5-5, and the first branch pipe should apply
EVRI-BP3, and according to the principle of maximum value, it
should apply EVRI-BP3.
N
6
(71)
3. Main pipe (please refer to Table 5-5 and Table 5-7)
In Fig.5-5, main pipe L1, its outdoor unit capacity is 45kW. Its
gas/liquid pipe diameter is Φ25.4/Φ12.7 according to Table 5-7.
Because total piping length of liquid + air side is ≥90m, according
to Table 5-5, its gas/liquid side is Φ28.6/Φ12.7. By maximum
principle, adopt Φ28.6/Φ12.7.
Connecting method
Outdoor unit 33.5kW/40kW
Outdoor unit 45kW
Indoor unit
Manifold
Pimitted value
≤250m L1+L2+L3+L4+L5+a+b+c+d+e+f
≤100m
L1+L2+L3+L4+L5+f (The first connect methond)
or L1+L3+L5+f (The second connect methond)
≤120m
L2+L3+L4+L5+f (The first connect methond)
≤40m
or L3+L5+f (The second connect methond)
≤15m a,b,c,d,e,f
≤30m
≤20m
≤8m
CAUTION
9
Table 5-10
Gas side Liquid side
Flare/welding Flare/welding
Flare/welding Flare/welding
Flare Flare
Flare/welding Flare/welding
Table 5-11(Liquid side pipe only)
Piping
V.2