RDCI Series – All DC Inverter Outdoor Units
6 720 862 437 (
2016/10
)
REFRIGERANT PIPE | 11
A
Branching pipe at the inside of the unit.
There are b, c, d, e, f, h, i, l, m, n, p, q, r branching pipes at the inside
of the unit, the branching pipe diameter should be select as per Table
5-8.
B
Main pipe and aux. pipe at the inside of the unit (Refer to Table 5-3
and Table 5-8)
1)
The aux. pipe a with N1, N2 downstream indoor units that total
capacity is 71×2=142, the pipe a diameter is Ø15.9/Ø9.5, thus
select IDU-BJR01 for the branching pipe I.
2)
The main pipe L3 with N1, N2 downstream indoor units that total
capacity is 71×2=142, the pipe L3 diameter is Ø19.1/Ø15.9/Ø9.5,
thus select SBOX02-1 for SB1.
3)
The main pipe L5 with N3 downstream indoor units that total capacity
is 140, the pipe L5 diameter is Ø19.1/Ø15.9/Ø9.5, thus select
SBOX02-1 for SB2.
4)
The main pipe L6 with N4 downstream indoor units that total capacity
is 28, the pipe L6 diameter is Ø12.7/Ø9.5/Ø6.4, thus select
SBOX02-1 for SB3.
5)
The main pipe L4 with N3, N4 downstream indoor units that total
capacity is 140+28=168, the pipe L4 diameter is Ø22.2/Ø19.1/
Ø9.5, thus select IDU-BJR02 for the branching pipe C.
6)
The main pipe L2 with N1~N4 downstream indoor units that total
capacity is 71×2+140+28=310, the pipe L2 diameter is Ø22.2/
Ø19.1/Ø12.7, thus select IDU-BJR02 for the branching pipe B.
7)
The main pipe L12 with N5 downstream indoor units that total
capacity is 140, the pipe L12 diameter is Ø19.1/Ø15.9/Ø9.5, thus
select SBOX02-1 for SB4.
8)
The aux. pipe g with N6, N7 downstream indoor units that total
capacity is 71×2=142, the pipe g diameter is Ø15.9/Ø9.5, thus
select IDU-BJR01 for the branching pipe II.
9)
The main pipe L13 with N6, N7 downstream indoor units that total
capacity is 71×2=142, the pipe L13 diameter is Ø19.1/Ø15.9/
Ø9.5, thus select SBOX02-1 for SB5.
10)
The main pipe L10 with N5~N7 downstream indoor units that total
capacity is 140+71×2=282, the pipe L10 diameter is Ø22.2/
Ø19.1/Ø12.7, thus select IDU-BJR02 for the branching pipe F.
11)
The aux. pipe k with N9, N10 downstream indoor units that total
capacity is 56×2=112, the pipe k diameter is Ø15.9/Ø9.5, thus
select IDU-BJR01 for the branching pipe III.
12)
The aux. pipe j with N8~N10 downstream indoor units
that total capacity is 28+56×2=140, the pipe j diameter
is Ø15.9/Ø9.5, thus select IDU-BJR01 for the branching
pipe IV.
13)
The main pipe L11 with N8~N10 downstream indoor units that total
capacity is 28+56×2=140, the pipe L11 diameter is Ø19.1/Ø15.9/
Ø9.5, thus select SBOX02-1 for SB6.
14)
The main pipe L9 with N5~N10 downstream indoor units that total
capacity is 140+56×2+71×2+28=422, the pipe L9 diameter is
Ø28.6/Ø22.2/Ø12.7, thus select IDU-BJR03 for the branching pipe
E.
15) The main pipe L8 with N11~N13 downstream indoor units that total
capacity is 140×2+56=336, the pipe L8 diameter is Ø28.6/Ø22.2/
Ø12.7, thus select SBOX04-1 for SB7.
16)
The main pipe L7 with N5~N13 downstream indoor units that total
capacity is 140×3+71×2+56×3+28=758, the pipe L7 diameter is
Ø34.9/Ø28.6/Ø19.1, thus select IDU-BJR04 for the branching pipe
D.
17)
The main pipe L1 with N1~N10 downstream indoor units that total
capacity is 140×4+71×4+56×3+28×2=1064, thus select IDU-
BJR05 for the branching pipe A.
C
Main pipe (Refer to Table 5-3, Table 5-5):
Main pipe L1 in the Fig.5-2, which upstream outdoor units
total capacity is 16+12+10=38, base on table 5-5, the low
pressure gas/high pressure gas/liquid pipe diameter are Ø41.3/
Ø34.9/Ø22.2, total capacity of the downstream indoor unit is
140×4+71×4+56×3+28×2=1064, base on table 5-3, the low
pressure gas/high pressure gas/liquid pipe diameter are Ø41.3/
Ø34.9/Ø19.1, take the large one for your selection, final confirm the
main pipe diameter is: low pressure gas/high pressure gas/liquid pipe
Ø41.3/Ø34.9/Ø22.2.
D
Parallel connect the outdoor units
1)
The outdoor unit linked by Pipe g1 is 10HP, parallel connects with
outdoor unit. the connective pipe diameter to be selected according to
its connector size is Ø22.2/Ø19.1/Ø12.7;
The outdoor unit linked by Pipe g2 is 12HP, parallel connects with
outdoor unit. the connective pipe diameter to be selected according to
its connector size is Ø22.2/Ø19.1/Ø12.7;
The outdoor unit linked by Pipe g3 is 16HP, parallel connects with
outdoor unit. the connective pipe diameter to be selected according to
its connector size is Ø28.6/Ø22.2/Ø15.9.
2)
G1 is the upstream of the two parallel connected outdoor units, refer
to Table 5-5 select the two parallel connected outdoor unit, the pipe
diameter is Ø34.9/Ø28.6/Ø19.1.
3)
Parallel connect the three outdoor units, refer to Table 5-7 should
select ODU-BJR03 for outdoor unit connective pipes (L+M).
5.8 Caution for brazing
■
When brazing use nitrogen to pass through the pipework. This helps
stop oxidisation inside the refrigerant pipework.
■
Do not use anti-oxidants when brazing the pipe joints. Residue can
block pipes and cause damage to the equipment.
■
Do not use flux when brazing. Use phosphor copper brazing filler
alloy (BCuP) which does not require flux.
■
Flux is extremely harmful on refrigerant systems. This can cause
corrosion and deterioration of the refrigerant oil.
5.9 Removing the contaminants in the pipework
■
Ensure there is no dirt or water in the pipework before connecting.
■
Ensure you flush nitrogen through to clear the refrigerant pipe work.
This needs to be done before connecting to the outdoor unit.
5.10 Strength/Tightness Test
Pressure test the system with nitrogen to 40kgf/cm
2
. Ensure a 24 hour
strength test has been completed for all new installations. For guidance on
tightness testing for existing installations, please refer to F Gas Regulations.
Fig. 5-4
SBOX
Indoor unit
Liquid pipe
Nitrogen
Nitrogen
Nitrogen
High-pressure gas pipe
Low-pressure gas pipe
