9
English
6-3 Example of connection
Example of connection
(Connection of 8 indoor units Heat pump system)
One outdoor
unit installed
(RX5~16)
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
H1
H2
H2
a
a
i
b
a
i
b
cd
e
f
g
h
123456
Outdoor unit
Outdoor unit
REFNET joint (A • B)
Indoor units (1-8)
cd
e
f
g
h
123456
Indoor units (1-8)
Refnet header
Refnet header
k
j
78
k
j
78
H1
H2
H2
Outdoor unit
Refnet header
Indoor units (1-8)
cd
e
f
g
h
b
1234567
8
8
ab
c
d
e
f
g
8
H2
H1
H3
H3
P
Indoor units (1-8)
Outdoor unit
REFNET joint (A-G)
REFNET joint (A • B)
hi
j
k
l
m
n
12
34
56
7
First outdoor
br
anch
H1
H3
a
Outdoor unit
Refnet header
Indoor units (1-8)
cd
e
f
g
h
b
12345
67
When m
ultiple
outdoor units
installed
(RX18~)
∗
If the system capacity is RX18 or more
, re-read to
the first outdoor br
anch as seen from the indoor unit.
Maxim
um
allo
w
a
b
le
length
Betw
een outdoor
and indoor units
Betw
een outdoor br
anch and indoor unit
(Only f
or RX18 or more)
Betw
een outdoor and indoor units
Betw
een indoor and indoor units
Betw
een outdoor and outdoor units
Actual pipe length
Actual pipe length
Actual pipe length
Diff
erence in height
Diff
erence in height
Diff
erence in height
Equiv
alent length
T
otal e
xtension length
Pipe length betw
een outdoor and indoor units
≤
150m
Example unit 8:
a + b + c + d + e + f + g + p
≤
150m
Example unit 8:
b + c + d + e + f + g + p
≤
40m
Equiv
alent pipe length betw
een outdoor and indoor units
≤
175m (assume equiv
alent pipe length of refnet joint to be 0.5m, that of refnet header to be 1m, calculation pur
poses)
Piping length from outdoor br
anch to outdoor unit
≤
10m Appro
ximately length:
max 13m
Diff
erence in height betw
een outdoor and indoor units (H1)
≤
50m (Max 40m if the outdoor unit is belo
w)
Diff
erence in height betw
een adjacent indoor units (H2)
≤
15m
Diff
erence in height betw
een outdoor unit (main) and outdoor unit (sub) (H3)
≤
5m
Pipe length from first refr
iger
ant br
anch kit (either refnet joint or refnet header ) to indoor unit
≤
40m
T
otal piping length from outdoor unit* to all indoor units
≤
300m
Allo
w
a
b
le
height
length
Allo
w
a
b
le length after the br
anch
Refrig
erant branc
h kit selection
Pipe siz
e selection
Siz
e do
wn of Liquid Pipe
Example unit 8:
a + i
≤
150m
Example unit 6:
a + b + h
≤
150m, unit 8:
a + i + k
≤
150m
Example unit 8:
i
≤
40m
Example unit 6:
b + h
≤
40m, unit 8:i + k
≤
40m
r
t
s
Outdoor unit
r
≤
10m (Appro
ximately length:
max 13m)
s
≤
10m (Appro
ximately length:
max 13m)
t
≤
10m (Appro
ximately length:
max 13m)
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 f
ollo
wing tab
le in accordance with the capacity of the outdoor unit.
Piping betw
een outdoor unit and refr
iger
ant br
anch kit (par
t A)
•
Match to the siz
e of the connection piping on the outdoor unit.
Piping betw
een refr
iger
ant br
anch kits
•
Choose from the f
ollo
wing tab
le in accordance with the total capacity of all the
indoor units connected belo
w this
.
•
Do not let the connection piping e
xceed the refr
iger
ant piping siz
e chosen b
y
gener
al system model name
.
F
or an outdoor unit m
ulti installation (RX18~48M),
mak
e the settings in accordance with the f
ollo
wing
figure
.
Ho
w to calculate the ad
ditional refrig
erant
to be c
har
g
e
d
If a negativ
e result is gotten f
or R from the f
o
rm
ula at r
ight, no refr
iger
ant
needs to be added.
Additional refr
iger
ant to be charged R (Kg)
R should be rounded off in units of 0.1Kg.
When the equiv
alent piping length is 30 m or less the siz
e of liquid piping
can be reduced as sho
wn in the tab
le on the r
ight.
Piping betw
een outdoor br
anch
and indoor unit (par
t C)
Piping betw
een outdoor br
anches (par
t B)
Piping betw
een outdoor unit and refr
iger
ant br
anch kit (par
t A)
RX5 type
RX8, 10 type
RX12~24 type
KHRJ26K17T
KHRJ26K37T
KHRKHRJ26K40TP
KHRKHRJ26K75TP
KHRKHRJ26K76TP
•
F
or refnet joints other than the first br
anch, select the proper br
anch kit model based on the total capacity inde
x.
< 100
100
≤
x< 160
160
≤
x< 330
KHRJ26K11T
KHRJ26K18T
KHRJ26K37T
KHRKHRJ26K40TP
KHRKHRJ26K75TP
KHRKHRJ26K76TP
330
≤
x< 640
640
≤
x< 900
900
≤
x
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:
250 type cannot be connected belo
w the REFNET header
.
< 100
100
≤
x < 160
160
≤
x < 330
330
≤
x < 640
KHRJ26K11H (Max.
4 kit)
KHRJ26K18H (Max.
8 kit)
KHRJ26K37H (Max.
8 kit)
KHRJ26K40H (Max.
8 kit) + KHRJ26K40HP
Ho
w to choose an outdoor br
anch kit (needed if the outdoor unit capacity type is RX18 or more
.)
•
Choose from the f
ollo
wing tab
le in accordance with the n
umber of outdoor units
.
2 unit
3 unit
BHF22M90
BHF22M135
e
xample in case of refnet joint C;
indoor units 3 + 4 + 5 + 6 + 7 + 8
e
xample in case of refnet joint B indoor units 7 + 8,
e
xample in case of refnet header
; indoor units 1 + 2 + 3 + 4 + 5 + 6
e
xample in the case of refnet header
; indoor units 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8
Example of do
wnstream indoor units
φ
12.7 × 0.8
φ
9.5 × 0.8
φ
15.9 × 1.0
φ
19.1 × 1.0
φ
22.2 × 1.0
RX5 type
RX8 type
RX10 type
RX12, 14, 16 type
RX18~22 type
RX24 type
RX26~34 type
RX36~48 type
φ
19.1 × 1.0
φ
28.6 × 1.2
φ
34.9 × 1.3
φ
41.3 × 1.7
φ
54.1 × 1.7
Gas pipe
indoor capacity inde
x
Piping siz
e (outer diameter × minim
um thic
kness)
Liquid pipe
φ
9.5
× 0.8
φ
12.7
× 0.8
φ
15.9
× 1.0
φ
19.1
× 1.0
φ
22.2
× 1.0
< 100
100
≤
x< 160
160
≤
x< 330
330
≤
x< 480
480
≤
x< 640
640
≤
x< 900
900
≤
φ
15.9
× 1.0
φ
19.1
× 1.0
φ
25.4
× 1.2
φ
34.9
× 1.3
φ
41.3
× 1.7
φ
54.1
× 1.7
Piping betw
een outdoor br
anches (par
t B)
•
Choose from the f
ollo
wing tab
le in accordance with the total capacity of all the
outdoor units connected abo
v
e
this
.
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.
φ
6.4 × 0.8
φ
9.5 × 0.8
φ
12.7 × 0.8
20, 25, 32, 40 type
50, 63, 80 type
100
, 125
type
200 type
250 type
φ
12.7 × 0.8
φ
15.9 × 1.0
φ
19.1 × 1.0
φ
25.4 × 1.2
φ
28.6 × 1.2
Piping betw
een outdoor br
anch and outdoor unit (par
t C)
Gas pipe
outdoor capacity type
Piping siz
e (outer diameter × minim
um thic
kness)
Liquid pipe
φ
15.9 × 1.0
φ
12.7 × 0.8
RX8 type
RX10 type
RX12, 14 type
RX16 type
φ
28.6 × 1.2
φ
34.9 × 1.3
a:
φ
19.1 × 30m
b:
φ
15.9 × 10m
c:
φ
0
9.5 × 10m
d:
φ
9.5 × 10m
e:
φ
9.5 × 10m
f :
φ
9.5 × 10m
g:
φ
1
6.4 × 10m
h:
φ
1
6.4 × 20m
i :
φ
12.7 × 10m
j :
φ
1
6.4 × 10m
k:
φ
1
6.4 ×
1
9m
Oil-equalizing line (Only f
or RX18 or more) (par
t D)
φ
6.4 × 0.8
Piping siz
e (outer diameter × minim
um thic
kness)
φ
19.1 × 1.0
φ
22.2 × 1.0
< 22HP
24HP
26HP <
φ
34.9 × 1.3
φ
41.3 × 1.7
(Unit:mm)
(Unit:mm)
(Unit:mm)
(Unit:mm)
(Unit:mm)
(Unit:mm)
R=
+
indoor capacity inde
x
Refrig
erant branc
h kit name
Number of outdoor units
Branc
h kit name
Outdoor unit
capacity type
Refrig
erant branc
h
kit name
RX26~34 type
RX36 type~
Outdoor unit
capacity type
Refrig
erant branc
h
kit name
indoor capacity
inde
x
indoor capacity
inde
x
Refrig
erant branc
h
kit name
Refrig
erant branc
h
kit name
Gas pipe
Outdoor unit capacity type
Piping siz
e (outer diameter × minim
um thic
kness)
Liquid pipe
Gas pipe
outdoor capacity inde
x
Piping siz
e (outer diameter × minim
um thic
kness)
Liquid pipe
Gas pipe
indoor capacity type
Piping siz
e (outer diameter × minim
um thic
kness)
Liquid pipe
+
+
++
_
If the outdoor unit is
RX34M and the
piping lengths are as at
right
R= 30 0.27 + 10 0.17 + 10 0.10 + 40 0.05 + 49 0.025
-
6 =8.025
b
a
c+d+e+f
g+h+j+k
i
8.0
NO
TE:
T
otal length (m)
of liquid piping
siz
e at
φ
22.2
×0.36
T
otal length (m)
of liquid piping
siz
e at
φ
19.1
×0.27
T
otal length (m)
of liquid piping
siz
e at
φ
15.9
×0.17
T
otal length (m)
of liquid piping
siz
e at
φ
12.7
×0.10
T
otal length (m)
of liquid piping
siz
e at
φ
9.5
×
0.05
T
otal length (m)
of liquid piping
siz
e at
φ
6.4
×
0.025
Model name
RX5~16M
RX18~32M
RX34~48M
0 kg
3 kg
6 kg
Amount of refr
iger
ant
Example f
or refr
iger
ant br
anch using refnet joint and refnet header f
or RX
34M
AB
C
D
E
F
G
AB
C
D
E
F
G
A
B
A
B
Oil-equalizing line (par
t D)
φ
9.5 (No need of siz
e do
wn)
φ
9.5
φ
12.7
φ
15.9
φ
19.1
RX5 type
RX8, 10 type
RX12, 14, 16 type
RX18~24 type
RX26~48 type
φ
9.5
φ
12.7
φ
15.9
φ
19.1
φ
22.2
(Unit:mm)
Siz
e do
wn of Liquid Pipe (Ref
er to the left)
Standar
d siz
e
Outdoor unit capacity type
Liquid Pipes (Outer diameter)
In case of siz
e do
wn
01_3P114261-9L-EN.fm Page 9 Thursday, August 28, 2003 3:33 PM
