10
English
7-6 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
ab
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
Total e
xtension length
Allo
w
ab
le
height
length
Allo
w
ab
le length after the br
anch
Ho
w to calculate the ad
ditional refrig
erant to be c
har
ged
Additional refr
iger
ant to be charged R (lb
.kg)
R should be rounded off in units of 0.1lb
.(kg)
AB
C
D
E
F
G
A
B
¢
Caution on selecting connection pipes
²
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
or 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 ≤ 230ft.(70m)
Example unit 8:
a + b + c + d + e + f + g + p ≤ 230ft.(70m)
Example unit 8:
a + i ≤230ft.(70m)
Example unit 6:
a + b + h ≤ 393ft.(120m), unit 8:
a + i + k ≤ 230ft.(70m)
Equiv
alent pipe length betw
een outdoor and indoor units ≤ 295ft.(90m) (assume equiv
alent pipe length of refnet joint to be 1.6f
t.(0.5m), that of refnet header to be 3.2ft.(1m), calculation pur
poses)
T
otal piping length from outdoor unit to all indoor units ≥33ft.(10m), ≤984ft.(300m)
Diff
erence in height betw
een outdoor and indoor units (H1) ≤ 98ft.(30m)
Diff
erence in height betw
een adjacent indoor units (H2) ≤49ft.(15m)
Example unit 8:
b + c + d + e + f + g + p
≤
131ft.
(40m)
Pipe length from first refr
iger
ant br
anch kit (either refnet joint or refnet header ) to indoor unit ≤ 131ft.(40m)
Example unit 8:
i ≤131ft.(40m)
Example unit 6:
b + h ≤131ft.(40m), unit 8:i + k ≤131ft.(40m)
Refrig
erant branc
h kit selection
Use refnet joint from the f
ollo
wing tab
le
.
RXTQ60 type
KHRP26A22T9
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.
RXTQ60 type
KHRP26M22H9(Max.
4 br
anch)
KHRP26M33H9(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.(90m) 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.)
I
7/8”
(22.2mm)
*
I
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)
I
3/8
” (9.5mm)
Liquid pipe
RXTQ60 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)
I
5/8”
(15.9mm)
I
3/8”
(9.5mm)
Gas pipe
Liquid pipe
24 · 30 · 36 ·
48 ·54 type
I
1/2”
(12.7mm)
I
1/4”
(6.4mm)
I
5/8”
(15.9mm)
I
3/8”
(9.4mm)
07 · 09 ·12 ·
15 · 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=
(lb
.)
(kg)
+
T
otal length (ft.)
of liquid piping siz
e
at
I
3/8”
×0.036
T
otal length (ft.)
of liquid piping siz
e
at
I
1/4”
×0.015
Example f
or refr
iger
ant br
anch using refnet joint and refnet header
0
b:
I
3/8” × 30ft.
d:
I
3/8” × 40ft.
e:
I
1/4” × 30ft.
1
g:
I
1/4” × 30ft.
h:
I
1/4” × 60ft.
i :
I
3/8” × 30ft.
j : 1/4” × 30ft.
Example f
or refr
iger
ant br
anch using refnet joint and refnet header
The piping
lengths are as
at right
The piping
lengths are as
at right
R= 230 × 0.036 + 210 × 0.015 = 11.07(lb.)
a+b+c+d+i
e+f+g+h+j+k
11.4
(in)
(mm)
(in)
(mm)
Refr
iger
ant br
anch kits can only be
used with R410A.
I
3/4”
(19.1mm)
o
I
7/8”
(22.2mm)
Refrig
erant branc
h kit name
*
When the siz
e is larger
R=
+
T
otal length (m)
of liquid piping siz
e
at
I
9.5
×0.054
T
otal length (m)
of liquid piping siz
e
at
I
6.4
×0.022
a:
I
9.5 × 30m
b:
I
9.5 × 9m
c:
I
9.5 × 9m
d:
I
9.5 × 12m
e:
I
6.4 × 9m
f :
I
6.4 × 9m
g:
I
6.4 × 9m
h:
I
6.4 × 18m
i :
I
9.5 × 9m
j :
I
6.4 × 9m
k:
I
6.4 ×9m
5.1
R= 69 × 0.054 + 63 × 0.022 = 5.04(kg)
a+b+c+d+i
e+f+g+h+j+k
a:
I
3/8” × 100ft.
c:
I
3/8” × 30ft.
f :
I
1/4” × 30ft.
k: 1/4” × 30ft.
01_EN_3P591321-1B.fm 10 ページ ２０１９年１２月２４日 火曜日 午後５時１９分
