Daikin VRV III Technical Data Manual page 38

11 Installation
11 - 1 Refrigerant Pipe Selection
For refnets joints other than the first branch (example refnet
joint b and c), select the proper branch kit model based on the
total capacity index of all indoor units connected after the
refrigerant branch.
Indoor unit
capacity index
<200
200≤x<290
290≤x<640
640≥
Concerning refnet headers, choose from the following table in
accordance with the total capacity of all the indoor units
connected below the refnet header:
Indoor unit
capacity index
<200
200≤x<290
290≤x<640
640≥
NOTICE
Refrigerant branch kits can only be used with R410A.
System piping limitations
Piping length restrictions
Make sure to perform the piping installation within the range of the
maximum allowable pipe length, allowable level difference and
allowable length after branching as indicated below ("8"=HXHD125):
Example 1: Branch with refnet joint
a b c
A B C
h i j
BS BS BS
q r s
1 2 3
Example 2: Branch with refnet joint and refnet header
a
H1
c d
BS BS
n p
1 2
Example 3: Branch with refnet header
a
b c d e
BS BS BS BS
j k m n
1 2 3 4
36
• Outdoor Unit • VRV
Refrigerant branch kit name
3 pipes
KHRQ23M20T KHRQ22M20T
KHRQ23M29T KHRQ22M29T
KHRQ23M64T KHRQ22M64T
KHRQ23M75T KHRQ22M75T
Refrigerant branch kit name
3 pipes
KHRQ23M29H KHRQ22M29H
KHRQ23M29H KHRQ22M29H
KHRQ23M64H KHRQ22M64H
KHRQ23M75H KHRQ22M75H
g
d e f
D E F G
p
k l m n
BS BS BS BS
t u v w
7 H2
4 5 6
8
i
A B
k
b
j
BS
8
m
g
e f h
H2
BS BS BS BS 7
q r s t
3 4 5 6
H1
g
f h i
BS BS BS
p q r
5 6 7 H2
8
®
• VRV Systems • Outdoor Unit
®
III heat recovery, with connection to heating only hydrobox • REYAQ-P
Maximum allowable lengths
Actual pipe length between outdoor and indoor unit
Example 1: a+b+c+d+e+f+g+p
2 pipes
Example 2: a+i+k
Example 3: a+i
Equivalent piping length between indoor and outdoor unit ð120 m
equivalent pipe length of refnet to be taken 0.5 m and for header
1.0 m.
Equivalent pipe length of BSVQ100 = 4 m
Equivalent pipe length of BSVQ160 = 4 m
Equivalent pipe length of BSVQ250 = 6 m
2 pipes
Total piping length from outdoor to all indoor units
Pipe length from first branch kit (either refnet joint or refnet header)
≤
to indoor unit 40 m
[Example 1]: unit 8: b+c+d+e+f+g+p
[Example 2]: unit 6: b+h+t
[Example 3]: unit 8: i
Maximum allowable height difference
Difference in height between outdoor and indoor units
≤
H1 40 m
Difference in height between lowest and heighest
≤
indoor unit H2
NOTICE
When the equivalent pipe length between outdoor and
indoor units is 90 m or more, the size of the main liquid
pipe must be increased. Never increase suction gas pipe
and HP/LP gas pipe sizes.
Depending on the length of the piping, the capacity may
drop, but even in such a case it is possible to increase the
H1
size of the main liquid pipe.
10
12~16
Make sure to perform the piping installation within the
range of the maximum allowable pipe length, allowable
level difference and allowable length after branching as
indicated above.
≤
100 m a+b+c+d+k+t
≤
100 m a+b+e+q
≤
100 m a+d+m
≤
40 m
≤ ≤
40 m, unit 8: i+k 40 m
≤ ≤
40 m, unit 2: c+k 40 m
15 m
HP Liquid Ø (mm)
→
9.5 12.7
→
12.7 15.9
1 2 3
4 5 6 7
1 Outdoor unit
2 Main pipes
3 Increase only liquid pipe size
4 First refrigerant branch kit
5 Branch selector box
6 Indoor unit
7 HXHD125 indoor unit
≤
100 m
≤
100 m
≤
100 m
≤
100 m
≤
300 m
H1
H2
4PW62582-1(2)