Installation manual
9
REMQ8~16P7Y1B
VRVIII System air conditioner
4PW37156-1
6.6.
Example of connection
Example of connection
(Connection of 8 indoor units Heat pump system)
Branc
h with refnet joint
Branc
h with refnet joint and refnet header
Branc
h with refnet header
Outdoor units installed
in a m
ultiple outdoor
unit system
(REYQ18~48)
Install the joint par
t (
par
t in the figure) of the outdoor unit m
ulti connection piping kit
hor
iz
ontally with attention to the installation restr
ictions descr
ibed in "connecting the
refr
iger
ant piping".
(*) In case of m
ulti combination, inter
prete the w
ord "outdoor" as "first outdoor
br
anch".
Maximim allo
wab
le
length
Betw
een outdoor and indoor units
Actual pipe length
Pipe length betw
een outdoor(*) and indoor units
≤
165 m
[Example] unit 8:
a+b+c+d+e+s
≤
165
m
[Example] unit 6:
a+b+l
≤
165 m,
unit 8:a+m+n+p
≤
165 m
[Example] unit 8:
a+o
≤
165 m
Equiv
alent length
Equiv
alent pipe length betw
een outdoor(*) and indoor units
≤
190 m (Assume equiv
alent pipe length of the refnet joint to be 0.5 m, of the refnet header to be 1.0 m,
of the BSVQ100 and BSVQ160 to be 4 m and of the BSVQ250 to be 6 m (f
or calculation pur
poses)) (See note 1 on ne
xt page)
T
otal e
xtension length
T
otal piping length from outdoor(*) to all indoor units
≤
1000 m
Betw
een the first outdoor unit m
ulti connection piping kit
and outdoor unit (in case of a m
ultiple outdoor unit system)
Actual and equiv
alent
pipe length
The actual pipe length from the first outdoor unit m
ulti connection piping kit to the outdoor unit
≤
10 m.
(x
≤
10 m, y
≤
10 m, z
≤
10 m)
The equiv
alent pipe length from the first outdoor unit m
ulti connection piping kit to the outdoor unit
≤
13 m.
(x
≤
13 m, y
≤
13 m, z
≤
13 m)
Allo
wab
le height
diff
erence
Betw
een outdoor and indoor units
Diff
erence in height betw
een outdoor and indoor units (H1)
≤
50 m (
≤
40 m if outdoor unit is located in a lo
w
er position).
Betw
een indoor and indoor units
Diff
erence in height betw
een adjacent indoor units (H2)
≤
15 m
Betw
een outdoor and outdoor units
Diff
erence in height betw
een adjacent outdoor units (H3)
≤
5 m
Allo
wab
le length after the branc
h
Actual pipe length
Pipe length from first refr
iger
ant br
anch kit (either refnet joint or refnet header) to indoor unit
≤
40 m (See note 2 on ne
xt page)
[Example] unit 8:
b+c+d+e+s
≤
40 m
[Example] unit 6:
b+l
≤
40 m, unit 8:
m+n+p
≤
40 m
[Example] unit 8:o
≤
40 m
Outdoor unit m
ulti connection piping kit and refrigerant branc
h kit selection
Ho
w to select the refnet joint
When using refnet joints at the first br
anch counted from the outdoor unit side, choose from the
follo
wing tab
le in accordance with the capacity of the outdoor unit (e
xample:
refnet joint A).
Ho
w to select the refnet header
Choose from the f
ollo
wing tab
le in accordance with the total capacity of all the indoor units connected
belo
w the refnet header
.
Note
:
280, 450 and 560 types cannot be connected low
er thanthe refnet header
.
Outdoor unit
capacity type (Hp)
Refrig
erant branc
h kit name
Indoor capacity
type (kW)
Refrig
erant branc
h kit name
3 pipes
2 pipes
8~10
KHRQ23M29T
<200
KHRQ23M29H KHRQ22M29H
12~22
KHRQ23M64T
200
≤
x<290
KHRQ23M29H KHRQ22M29H
≥
24
KHRQ23M75T
290
≤
x<640
KHRQ23M64H
KHRQ22M64H
F
or refnet joints other than the first br
anch, select the proper br
anch kit model based on the
total capacity inde
x.
≥
640
KHRQ23M75H KHRQ22M75H
Ho
w to c
hoose an outdoor m
ulti connection piping kit (this is required when the
system is a m
ultiple outdoor unit system)
Indoor capacity
type (kW)
Refrig
erant branc
h kit name
3 pipes
2 pipes
Choose from the f
ollo
wing tab
le in accordance with the number of outdoor units
<200
KHRQ23M20T
KHRQ22M20T
Number of
outdoor units
Branc
h kit name
200
≤
x<690
KHRQ23M29T9
KHRQ22M29T
290
≤
x<640
KHRQ23M64T
KHRQ22M64T
2
BHFQ23P907
≥
640
KHRQ23M75T
KHRQ22M75T
3
BHFQ23P1357
Example of do
wnstream indoor units
[Example]
in case of refnet joint C:
indoor units 5+6+7+8
[Example]
in case of refnet joint B:
indoor units 7+8,
in case of refnet header
: indoor units 1+2+3+4+5+6
[Example]
in case of refnet header
: indoor units
1+2+3+4+5+6+7+8
Use the outdoor unit m
ulti connection piping kit that is sold separ
ately
as an option (BHF1357) f
or the m
ulti installation of outdoor
units
. Selection method is as sho
wn in the r
ight tab
le
.
AB
C
D
E
ab
c
d
e
8
H2
H1
H3
f
ln
p
B1
B2
B3
B4
xy
z
F
h
1
g
G
j
2
k
mo
q
r
s
3
i
4
5
6
7
A
B
am
H2
H1
H3
b
B1
B2
B3
B4
n
p
xy
z
d
1
fh
g
j
i
kl
o
2
3
4
5
6
7
8
ce
B5
a
H2
H1
H3
B1
B2
B3
B4
xy
z
c
1
eg
f
i
hj
l
no
2
3
4
5
6
7
8
k
bd
B2
B3
m
Outdoor unit side (3 pipes)
Indoor unit side (2 pipes)
Suction gas pipe
Gas pipe
HP/LP gas pipe
BS unit
Liquid pipe
Liquid pipe
indoor unit
refnet header
Outdoor unit side (3 pipes)
refnet joint
outdoor m
ulti connection piping kit
Indoor unit side (2 pipes)
Refr
iger
ant br
anch kits can only be used with R410A.
