• Outdoor Unit • VRV
®
III heat recovery, with connection to heating only hydrobox • REYAQ-P
• VRV
®
Systems • Outdoor Unit
36
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.
■
Concerning refnet headers, choose from the following table in
accordance with the total capacity of all the indoor units
connected below the refnet header:
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):
Maximum allowable lengths
Actual pipe length between outdoor and indoor unit
≤
100 m
Example 1: a+b+c+d+e+f+g+p
≤
100 m
a+b+c+d+k+t
≤
100 m
Example 2: a+i+k
≤
100 m
a+b+e+q
≤
100 m
Example 3: a+i
≤
100 m
a+d+m
≤
100 m
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
Total piping length from outdoor to all indoor units
≤
300 m
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
≤
40 m
[Example 2]: unit 6: b+h+t
≤
40 m, unit 8: i+k
≤
40 m
[Example 3]: unit 8: i
≤
40 m, unit 2: c+k
≤
40 m
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
≤
15 m
Indoor unit
capacity index
Refrigerant branch kit name
3 pipes
2 pipes
<200
KHRQ23M20T
KHRQ22M20T
200
≤
x<290
KHRQ23M29T
KHRQ22M29T
290
≤
x<640
KHRQ23M64T
KHRQ22M64T
640
≥
KHRQ23M75T
KHRQ22M75T
Indoor unit
capacity index
Refrigerant branch kit name
3 pipes
2 pipes
<200
KHRQ23M29H
KHRQ22M29H
200
≤
x<290
KHRQ23M29H
KHRQ22M29H
290
≤
x<640
KHRQ23M64H
KHRQ22M64H
640
≥
KHRQ23M75H
KHRQ22M75H
NOTICE
Refrigerant branch kits can only be used with R410A.
Example 1: Branch with refnet joint
Example 2: Branch with refnet joint and refnet header
Example 3: Branch with refnet header
a
b
c
d
e
f
g
H1
p
A
B
C
D
E
F
G
BS
8
h
i
j
k
l
m
n
q
r
s
t
u
v
w
1
2
3
4
5
6
7 H2
BS
BS
BS
BS
BS
BS
H1
H2
a
i
b
c
d
e
f
g
h
k
j
8
A
B
n
p
q
r
s
t
m
1
2
3
4
5
6
7
BS
BS
BS
BS
BS
BS
BS
a
H1
H2
c
d
e
f
g
h
i
b
8
j
k
m
n
p
q
r
1
2
3
4
5
6
7
BS
BS
BS
BS
BS
BS
BS
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
size of the main liquid pipe.
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.
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
H1
H2
HP
Liquid Ø (mm)
10
9.5
→
12.7
12~16
12.7
→
15.9
1
6 7
2
5
4
3
4PW62582-1(2)
