SiUS34-907
Appendix
4. Example of Connection
Example of connection
(Connection of 8 indoor units
Heat Pump system)
Branch with REFNET joint
Branch with REFNET joint and REFNET header
Branch with REFNET header
ab
c
d
e
f
g
hi
j
k
l
m
n
12
34
56
7
8
H2
H1
p
Outdoor unit
REFNET joint (A-G)
Indoor units (1-8)
H1
H2
a
a
i
i
b
cd
e
f
g
h
123456
Outdoor unit
REFNET joint (A • B)
Indoor units (1-8)
REFNET header
k
j
78
H1
H2
Outdoor unit
REFNET header
Indoor units (1-8)
cd
e
f
g
h
b
1234567
8
Maxim
um
allo
w
a
b
le
length
Betw
een outdoor and
indoor units
Betw
een outdoor and indoor units
Betw
een indoor and indoor units
Actual pipe length
Actual pipe length
Diff
erence in height
Diff
erence in height
Equiv
alent length
T
otal e
xtension length
Allo
w
a
b
le
height
length
Allo
w
a
b
le length after the br
anch
Ho
w to calculate the ad
ditional refrig
erant to be c
har
g
e
d
Additional refr
iger
ant to be charged R (lb
.)
R should be rounded off in units of 0.1lb
.
AB
C
D
E
F
G
A
B
〈
Caution on selecting connection pipes
〉
Pipe siz
e selection
Caution)
In br
azing connection in the siz
e
increase area in the piping, use a
diff
erent-diameter joint f
o
r connection.
(The diff
erent-diameter joint
should be arr
anged in the local field.)
The connection area is located near the outdoor unit (usually after
the first bending outside the unit).
[Gas side]
Outdoor unit
The first refr
iger
ant
br
anching kit
Enlarge
Indoor unit
Main pipe
Pipe length betw
een outdoor and indoor units
≤
492ft.
Example unit 8:
a + b + c + d + e + f + g + p
≤
492ft.
Example unit 8:
a + i
≤
492ft.
Example unit 6:
a + b + h
≤
393ft., unit 8:
a + i + k
≤
492ft.
Equiv
alent pipe length betw
een outdoor and indoor units
≤
580ft.
(assume equiv
alent pipe length of REFNET joint to be 1.6ft., that of REFNET header to be 3.2ft., calculation pur
poses)
T
otal piping length from outdoor unit to all indoor units
≥
33ft.,
≤
1000ft.
Diff
erence in height betw
een outdoor and indoor units (H1)
≤
164ft.
(Max 130ft.
if the outdoor unit is belo
w)
Diff
erence in height betw
een adjacent indoor units (H2)
≤
49ft.
Example unit 8:
b + c + d + e + f + g + p
≤
130ft.
Pipe length from first refr
iger
ant br
anch kit (either REFNET joint or REFNET header ) to indoor unit
≤
130ft.
Example unit 8:
i
≤
130ft.
Example unit 6:
b + h
≤
130ft., unit 8:i + k
≤
130ft.
Refrig
erant branc
h kit selection
Use REFNET joint from the f
ollo
wing tab
le
.
RXYMQ36,48 type
KHRP26M22T
Outdoor unit capacity type
Refrig
erant branc
h kit name
Ho
w to select the REFNET header
• Choose from the f
ollo
wing tab
le belo
w the REFNET header according
to the n
umber of units on the system.
RXYMQ36,48 type
KHRP26M22H (Max.
4 br
anch)
KHRP26M33H (Max.
8 br
anch)
Outdoor unit capacity type
•
When the equiv
alent piping length betw
een the outdoor unit and the
indoor unit is 295ft.
or more
, mak
e sure to use a thic
ker pipe as the
main pipe on the gas side
.
When the air conditioning ability is reduced due to the refr
iger
ant
piping distance
, a thic
ker pipe ma
y be used also as the main pipe
.
(Unit:
in.)
φ
5/8”
(15.9mm)
φ
3/4”
(19.1mm)
Outdoor unit connection pipe siz
e
Connection pipe siz
e
Gas pipe
Outdoor unit
capacity type
Piping siz
e (outer diameter)
φ
3/8 (9.5mm)
Liquid pipe
RXYMQ36,48
type
Piping betw
een outdoor unit and refr
iger
ant br
anch kit
•
Match to the siz
e of the connection piping on the outdoor unit.
(Unit:
in.)
(Unit:
in.)
Piping betw
een refr
iger
ant br
anch kits
•
Use the pipe siz
e from the f
ollo
wing tab
le
.
Piping siz
e (outer diameter)
φ
5/8”
(15.9mm)
φ
3/8”
(9.5mm)
Gas pipe
Liquid pipe
24 · 30 · 36 ·
48 type
φ
1/2”
(12.7mm)
φ
1/4”
(6.4mm)
φ
5/8”
(15.9mm)
φ
3/8”
(9.4mm)
07 · 09 ·12 ·
18 type
Piping siz
e
(outer diameter)
Indoor unit
capacity type
Gas pipe
Liquid pipe
Betw
een refr
iger
ant br
anch kit and indoor unit
•
Pipe siz
e f
or direct connection to indoor unit m
ust be the
same as the connection siz
e of indoor unit.
Indoor unit connection pipe siz
e
R=
+
T
otal length (ft.)
of liquid piping
siz
e
at
φ
3/8”
⎛ ⎜ ⎝
⎞ ⎟ ⎠
×0.036
T
otal length (ft.)
of liquid piping
siz
e
at
φ
1/4”
⎛ ⎜ ⎝
⎞ ⎟ ⎠
×0.015
Example f
o
r refr
iger
ant br
anch using REFNET joint and REFNET header
a:
×
100ft.
b:
×
30ft.
c:
0
3/8”
3/8”
3/8”
× 30ft.
d:
3/8”
×
40ft.
e:
1/4”
1/4”
× 30ft.
f :
× 30ft.
g:
1
1/4” ×
30ft.
h:
1
1/4” ×
60ft.
i :
3/8”
× 30ft.
j :
1
1/4” ×
30ft.
k:
1
1/4” ×
30ft.
The piping
lengths are as
at r
ight
R= 220 0.036 + 210 0.015 = 11.07
a+b+c+d+i
e+f+g+h+j+k
11.1
Refr
iger
ant br
anch kits can only be
used with R-410A.
φ
5/8”
(15.9mm)
→ φ
3/4”
(19.1mm)
Refrig
erant branc
h kit name
*
When the siz
e is larger
Summary of Contents for VRV III-S RXYMQ36 48PVJU
Page 1: ...RXYMQ36 48PVJU R 410A Heat Pump 60Hz SiUS34 907...
Page 9: ...SiUS34 907 Safety Considerations viii...
Page 237: ...Wiring Diagrams SiUS34 907 228 Appendix 2 2 Field Wiring RXYMQ36 48PVJU 3D065370...
Page 238: ...SiUS34 907 Wiring Diagrams Appendix 229 2 3 Indoor Unit FXFQ12M 18M 24M 30M 36MVJU 3D042620C...
Page 239: ...Wiring Diagrams SiUS34 907 230 Appendix FXZQ07M 09M 12M 18MVJU 3D059263...
Page 240: ...SiUS34 907 Wiring Diagrams Appendix 231 FXDQ07M 09M 12M 18M 24MVJU 3D050501A...
Page 241: ...Wiring Diagrams SiUS34 907 232 Appendix FXMQ07P 09P 12P 18P 24P 30P 36P 48PVJU 3D065984A...
Page 242: ...SiUS34 907 Wiring Diagrams Appendix 233 FXHQ12M 24M 36MVJU 3D048116A...
Page 243: ...Wiring Diagrams SiUS34 907 234 Appendix FXAQ07M 09M 12M 18M 24MVJU 3D046039D...
Page 244: ...SiUS34 907 Wiring Diagrams Appendix 235 FXLQ12M 18M 24MVJU FXNQ12M 18M 24MVJU 3D045644A...
Page 247: ...Option List SiUS34 907 238 Appendix...
Page 249: ...Example of Connection 240...
Page 263: ...Precautions for New Refrigerant R 410A SiUS34 907 254 Precautions for New Refrigerant R 410A...
