Branch Pipes For Indoor Unit; Example - Carrier Xpower Series Installation Manual

5.6 Branch pipes for indoor unit

Based on Tab.5-7 and Tab.5-8, select the multi connection pipes
for the outdoor unit. Before installation, read the installation
manual for Outdoor Unit branch joints.
Table.5-7 Outdoor unit multi-connective pipe assembly (Illustration)
Outdoor
unit Qty.
2 units
g2
3 units
g3
4 units
g4
Table.5-8 Outdoor unit multi-connective pipe assembly
Outdoor unit connective
Outdoor
pipe diameter
unit Qty.
g1, g2:
8~12HP: Φ25.4/Φ12.7;
2 units
14~22HP: Φ31.8/Φ15.9
g1, g2, g3:
8~12HP: Φ25.4/Φ12.7;
3 units
14~22HP: Φ31.8/Φ15.9;
G1: Φ38.1/Φ19.1
g1, g2, g3, g4:
8~12HP: Φ25.4/Φ12.7;
4 units
14~22HP: Φ31.8/Φ15.9;
G1: Φ38.1/Φ19.1;
G2: Φ41.2/Φ22.2
Note: The pipe assemblies in the above table are special to this
model and must be purchased separately.

5.7 Example

1) Take (22+12+12) HP with three modules as an example to
clarify pipe selection.
2) Take Fig.5-4 as an example, where the equivalent length of all
pipes is larger than 90 m.
Illustration
g1
Main pipe
L
g2 g1
Main pipe
M
L
G1
g3 g2 g1
Main pipe
N
M
L
G2
G1
Parallel connect
with the branch
Main pipe
joint assembly
L:
BJC-02-CM (i)
L+M:
Refer to
Table. 5-4
BJC-03-CM(i)
or 5-5 for
main
pipe's
dimensions
L+M+N:
BJC-04-CM(i)
Table.5-9
When the branch
Indoor unit
joint's length ≤10 m
capacity
A(×100W)
Gas side
A≤45 Φ12.7
A≥56
Φ15.9
A The branch joint in the inside of the unit.
There are a~m branch joints in the inside of the unit. The
branch joint diameter should be selected as per Tab. 5-9.
B Main pipe inside the unit (Refer to Table. 5-3)
1) The main pipe L4 with N2, N3 downstream indoor units has a
total capacity of 140+71=211l. Pipe L4 diameter is Φ19.1/Φ
9.5. So, select BJF-224-CM(i) for branch joint D.
2) The main pipe L3 with N1~N3 downstream indoor units has a
total capacity of 140×2+71=351. Pipe L3 diameter is Φ28.6/ Φ
12.7. So, select BJF-710-CM(i) for branch joint C.
3) The main pipe L6 with N5, N6 downstream indoor units has a
total capacity is 140+28=168. Pipe L4 diameter is Φ19.1/Φ 9.5.
So, select BJF-224-CM(i) for branch joint F.
4) The main pipe L5 with N4~N6 downstream indoor units has a
total capacity of 140×2+28=308. Pipe L5 diameter is Φ22.2/ Φ
9.5. So, select BJF-330-CM(i) for branch joint E.
5) The main pipe L2 with N1~N6 downstream indoor units has a
total capacity of 140×4+71+28=659. Pipe L2 diameter is Φ
28.6/Φ15.9. So, select BJF-710-CM(i) for branch joint B.
The main pipe L10 with N9, N10 downstream indoor units has
6)
a total capacity of 71+28=99. Pipe L10 diameter is Φ15.9/Φ
9.5. So, select BJF-224-CM(i) for branch joint J.
The main pipe L9 with N8~N10 downstream indoor units has a
7)
total capacity of 140+71+28=239. Pipe L9 diameter is Φ
22.2/Φ9.5. So, select BJF-330-CM(i) for branch joint I.
The main pipe L8 with N7~N10 downstream indoor units has a
8)
total capacity of 140X2+71+28=379. Pipe L8 diameter is Φ
28.6/Φ12.7. So, select BJF-710-CM(i) for branch joint H.
The main pipe L12 with N12, N13 downstream indoor units
9)
has a total capacity of 56×2=112. Pipe L12 diameter is Φ
15.9/Φ9.5. So, select BJF-224-CM(i) for branch joint L.
The main pipe L11 with N11~N13 downstream indoor units has
10)
a total capacity of 140+56×2＝252. Pipe L11 diameter is Φ
22.2/Φ9.5. So, select BJF-330-CM(i) for branch joint K.
The main pipe L7 with N7~N13 downstream indoor units has a
11)
total capacity of 140×3+71+56×2+28＝631, the pipe L7
diameter is Φ28.6/Φ15.9. So, select BJF-710-CM(i) for branch
joint G.
The branch joint A with N1~N13 downstream indoor units has
12)
a total capacity of 140×7+71×2+56×2+28×2＝1290. So, select
BJF-1344-CM(i) for branch joint A.
Example: parallel connection of three outdoor units 12+12+22
C
(total capacity 46 HP). The total capacity of the indoor units is
1,290, if the equivalent length of all pipes is ≥90 m. According
to Tab.5-5, the main pipe's diameter is Φ38.1/Φ22.2. The
master unit's diameter is Φ38.1/Φ19.1 based on Tab.5-3.
Select the largest. The main pipe's diameter is Φ38.1/Φ22.2
When the branch
joint's length＞10 m
Liquid side Gas side Liquid side
Φ6.4 Φ15.9
Φ9.5 Φ19.1
Installation manual
Unit: mm
Φ9.5
Φ12.7
15