Size Of Joint Pipes For Indoor Unit - Carrier Xpower Series Installation Manual

CAUTION
1. The reduced length of the branch joint is the 0.5m of the equiva-
lent length.
2. The inner units should as equal as possible to be installed in the
both sides of the U-shape branch joint.
3. When the outdoor unit is higher and the difference in levels is
over 20 m, set an oil return bend every 10 m in the air pipe of the
main pipe. See Fig.5-2 for the specification of the oil return bend.
4. When the outdoor unit is lower, H≥40m, the liquid pipe of the
main pipe needs to be increased by one size.
5. The first branch joint connected to the indoor unit must be no
more than 40 m unless the following conditions are met. Then it
can extend to 90 m.
Conditions
1. Increase all pipe diameters of the main distribution pipe
between the first and the last branch joint assembly. (Change the
pipe diameter in the field.) If the pipe diameter of the main slave
pipe is the same as the main pipe, it does not need to be
increased.
L +L +L +L +i≤90m,L
N9
7 8 9 10
Need to increase the pipe diameter of the
L ,L ,L
10 11 12
distribution pipe.
Increase the size as follows
φ9.5→φ12.7 φ12.7→φ15.9 φ15.9→φ19.1
φ19.1→φ22.2 φ22.2→φ25.4 φ25.4→φ28.6
φ28.6→φ31.8 φ31.8→φ38.1 φ38.1→φ41.2
φ41.2→φ44.5 φ44.5→φ54.0
2. When counting the total extended length, the actual length of
above distribution pipes must be doubled (except main pipes and
distribution pipes that do not need to be increased).
L +(L +L +L +L +L +L +L
1 2 3 4 5 6 7
+L )x2+a+b+c+d+e+f+g+h+i+j+k+l+m
12
Reference Fig. 5-1
3. The length from the indoor unit to the nearest branch joint
assembly ≤20m
a,b,c,...m≤20m
(Pipe diameter requirements, please
refers to Tab .5-9)
Reference Fig.5-1
4. The distance difference between [the outdoor unit to the farthest
indoor unit] and [the outdoor unit to the nearest indoor unit] is
≤40m.
The farthest indoor unit N9
The nearest indoor unit N1
(L +L +L +L +L +i)-(L1+L2+L3+a)
1 7 8 9 10
Examples
,L ,L ,L ,L ,L ,L ,L ,
2 3 4 5 6 7 8 9
Conditions
+L +L +L
8 9 10 11
≤1000m
Examples
Conditions
Examples
Conditions
≤40m
Reference Fig.5-1

5.2 Size of joint pipes for indoor unit

Table.5-2
Pipe name
Main pipe
Indoor unit main pipe
Indoor unit aux. pipe
Indoor unit branch joint assembly
Outdoor unit branch joint assembly
Outdoor unit connective pipe
Size of joint pipes for 410A indoor unit
Table.5-3
Capacity of
Size of main pipe(mm)
indoor unit
A(×100W)
Gas side
A<166 Φ15.9
166≤A<230
Φ19.1
230≤A<330
Φ22.2
330≤A<460
Φ28.6
Φ28.6
460≤A<660
660≤A<920
Φ31.8
920≤A<1350
Φ38.1
1350≤A<1800
Φ41.2
1800≤A Φ44.5
e.x.1: Refer to Fig.5-3, the capacity of downstream units to L4 is
140+71=211; the gas pipe for L4 is Φ19.1; the liquid pipe is Φ9.5.
Examples
Code(refer to Fig.5-1)
L
1
L L L L ... L12
2, 3, 4, 5,
a, b, c, d,... m
A, B, C, D, E, F, G, H, I, J, K, L
L, M
g1, g2, g3, G1
Available
Liquid side
branch joint
Φ9.5
BJF-224-CM(i)
Φ9.5
BJF-224-CM(i)
Φ9.5
BJF-330-CM(i)
Φ12.7
BJF-710-CM(i)
Φ15.9
BJF-710-CM(i)
Φ19.1
BJF-710-CM(i)
Φ19.1
BJF-1344-CM(i)
Φ22.2
BJF-E1344-CM(i)
Φ25.4
BJF-E1344-CM(i)
Installation manual
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