RXYSQ4~6M7V3B
VRVII-S system air conditioner
4PW17806-1C
Installation manual
9
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
Maxim
um
allo
wab
le
length
Betw
een outdoor and
indoor units
Actual pipe length
Pipe length betw
een outdoor and indoor units
≤
150 m
[Example] unit 8:
a+b+c+d+e+f+g+p
≤
150 m
[Example] unit 6:
a+b+h
≤
150 m, unit 8:
a+i+k
≤
150 m
[Example] unit 8:
a+i
≤
150 m
Equiv
alent length
Equiv
alent pipe length betw
een outdoor and indoor units
≤
175 m (Assume equiv
alent pipe length of refnet joint to be 0.5 m and of the refnet header to be 1.0 m.
(f
or calculation pur
pose
s))
T
otal e
xtension
length
T
otal piping length from outdoor unit to all indoor units betw
een 10 m and 300 m
Allo
wab
le
height
Betw
een outdoor and
indoor units
Diff
erence in
height
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
Diff
erence in height betw
een adjacent indoor units (H2)
≤
15 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
[Example] unit 8:
b+c+d+e+f+g+p
≤
40 m
[Example] unit 6:
b+h
≤
40 m, unit 8:
i+k
≤
40 m
[Example] unit 8:
i
≤
40 m
Refrig
erant branc
h kit selection
Refr
iger
ant br
anch kits can only be used with R-410A.
Use the f
ollo
wing refnet joint
Use the f
ollo
wing refnet header
Pipe siz
e selection
Caution on selecting connection pipes
If the o
v
er
all equiv
alent piping length is
≥
90 m, be sure to
enlarge the pipe diameter of the gas-side main piping.
If the
recommended pipe siz
e is not a
v
ailab
le
, stic
k to the or
iginal
pipe diameter (which ma
y result in a small capacity decrease).
[Gas side]
5:
Ø15.9
➝
Ø19.1
RXYSQ6:
Ø19.1
➝
Ø22.2
A.
Piping between outdoor unit and refrigerant branc
h kit
•
Match to the siz
e of the connection piping on the outdoor unit.
Outdoor unit connection piping siz
e
B.
Piping between refrig
erant branc
h kits
•
Use the pipe siz
e from the f
ollo
wing tab
le
.
C.
Piping between refrig
erant branc
h kit and indoor unit
•
Pipe siz
e f
or direct connection to indoor unit must be the same as the
connection siz
e of indoor unit.
Ho
w to calculate the ad
ditional refrig
erant to be c
har
g
e
d
Additional refr
iger
ant to be charged R (kg)
R should be rounded off in units of 0.1 kg
indoor unit
refnet joint
refnet header
ab
c
d
e
f
g
hi
j
k
l
m
n
12
34
56
7
8
H2
H1
p
AB
C
D
E
F
G
H1
H2
a
i
b
cd
e
f
g
h
123456
k
j
78
A
B
a
H1
H2
cd
e
f
g
hi
b
1234567
8
Outdoor unit capacity type
Refrig
erant branc
h kit name
RXYSQ4~6
KHRQ22M20T
Outdoor unit capacity type
Refrig
erant branc
h kit name
RXYSQ4~6
KHRQ22M29H
1
2
3
1
Main pipe (enlarge)
2
First refr
iger
ant br
anch kit
3
Indoor unit
Outdoor unit
capacity type
Piping siz
e (outer diameter x minim
um
thic
kness)
Gas pipe
Liquid pipe
5
Ø15.9x1.0
(Ø19.1x1.0)
Ø9.5x0.8
RXYSQ6
Ø19.1x1.0
(Ø22.2x1.0)
Piping siz
e (outer diameter x minim
um thic
kness)
Gas pipe
Liquid pipe
Ø15.9x1.0
Ø9.5x0.8
Indoor capacity
inde
x
Piping siz
e
(outer diameter x minim
um thic
kness)
Gas pipe
Liquid pipe
20+25+32+40+50
Ø12.7x0.8
Ø6.4x0.8
63+80+100+125
Ø15.9x1.0
Ø9.5x0.8
R=
(
T
otal length (m) of liquid
piping siz
e at Ø9.5
)
x0.054+
(
T
otal length (m) of liquid
piping siz
e at Ø6.4
)
x0.022
Example f
or refrig
erant branc
h using refnet joint and refnet header
R=[73 x 0.054] + [69 x 0.022] = 5.46
⇒
5.5 kg
a:
Ø9.5x30 m
d
: Ø9.5x13 m
g
: Ø6.4x10 m
j: Ø6.4x10 m
b:
Ø9.5x10 m
e
: Ø6.4x10 m
h
: Ø6.4x20 m
k
: Ø6.4x9 m
c:
Ø9.5x10 m
f:
Ø6.4x10 m
i: Ø9.5x10 m
