Daikin RXYQ6BRY16 Installation Manual page 24

Maximum allowable length after branch
The pipe length from the first refrigerant branch kit to
the indoor unit ≤ 40 m
Example 1.1: unit 8: b+c+d+e+f+g+p ≤ 40 m
Example 1.2.1: unit 6: b+h ≤ 40 m, unit 8: i+k ≤ 40 m
Example 1.2.2: unit 6: g ≤ 40 m, unit 8: h+j ≤ 40 m
Example 1.3: unit 8: i ≤ 40 m
However, extension is possible if all below conditions are
met. In this case limitation can be extended up to 90 m.
1
a b c
2
A B
h i
3
1 2
1 Outdoor units
2 REFNET joints (A – G)
3 Indoor unit (1 – 8)
a The piping length between all indoor to the nearest
branch kit is ≤ 40 m.
Example: h, I, j ... p ≤ 40 m.
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 40 m.
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:
Ø9.5 mm → Ø12.7 mm
Ø12.7 mm → Ø15.9 mm
Ø15.9 mm → Ø19.1 mm
Ø19.1 mm → Ø22.2 mm
Ø22.2 mm → Ø25.4 mm
Ø28.6 mm → Ø31.8 mm
Ø34.9 mm → Ø38.1 mm
Example: unit 8: b+c+d+e+f+g+p ≤ 90 m and
b+c+d+e+f+g > 40 m; increase the pipe size of b, c, d,
e, f, g.
(3) I f available on the site. Otherwise it cannot be
increased.
c When the piping size is increased (step b), 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 Maximum allowable length between outdoor and
indoor unit on page 20).
Example:
a+b*2+c*2+d*2+e*2+f*2+g*2+h+i+j+k+l+m+n+p ≤ 1000 m
d For Q125, Q140 and Q200 types which has a difference
in actual pipe length between the outdoor unit and the
nearest indoor unit that exceed 40 m, increasing the
size of the gas pipe and liquid pipe between the final
branch and the indoor unit is required.
Example: The farthest indoor unit 6 , The nearest
indoor unit 1 : (a+b+c+d+e+f+m)–(a+h) > 40 m;
increase the pipe size of m. After size up, if pipe m
becomes bigger than upper side (m>f), upper side
pipe is required to size up.
22
01_EN_3P748230-1.indd 22
d e f g
C D E F G
H1
p
j k l m n
3 4 5 6 7
(Q140) 8
H2
(3)
(3)
(3)
NOTICE
In case of size up, difference type of joint is
•
required to connect indoor unit and field piping.
In case of size up is exceed above pipe size,
•
above pipe is required to size up.
Not allowable if can not size up.
•
Please note that a reducer may be required
•
depending on the combination when the
piping size is increased by one size.
9.4.3 System containing VRV indoor units and
Mini-split indoor units
System setup
a
A
c
H4
e
BP1
H5
H1
h i j
1 2 3
Header 1 – 5
BP unit 6, 7
Difference in height between outdoor and BP unit: H4.
Difference in height between BP unit and BP unit: H5.
Difference in height between BP unit and Mini-split indoor unit: H6.
Maximum allowable length
Between outdoor unit and indoor unit.
•
Example:
Actual piping
100 m
length
a+b+g+l ≤ 100 m
Equivalent
120 m —
length
(a)
Example:
Total piping
250 m
length
a+b+d+g+l+k+c+e+f+h+i+j ≤ 250 m
(a) A ssume equivalent piping length of REFNET joint =
0.5 m and REFNET header = 1 m (for calculation
purposes).
Between BP unit and indoor unit.
•
Indoor unit capacity index
<60
60
71
Remark: M inimum allowable length between outdoor
unit and first refrigerant branch kit > 5 m
(the refrigerant noise from the outdoor unit can
be transmitted).
Example: a > 5 m
b d
B
g
f
6 7
BP2
k
H2
H6 I
4
5
Mini-split indoor units
VRV indoor units
Pipe length
2~15 m
2~12 m
2~8 m
23/01/2023 17:24:15