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
AB
C
D
E
F
G
A
B
Pipe length betw
een outdoor and indoor units ≤ 100ft.(30.5m)
Example unit 8:
a + b + c + d + e + f + g + p ≤ 100ft.(30.5m)
Example unit 8:
a + i ≤100ft.(30.5m)
Example unit 6:
a + b + h ≤ 100ft.(30.5m), unit 8:
a + i + k ≤ 100ft.(30.5m)
Equiv
alent pipe length betw
een outdoor and indoor units ≤ 125ft.(38m) (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 ≤492ft.(150m)
Diff
erence in height betw
een outdoor and indoor units (H1) ≤ 98ft.(30m) In case of outdoor unit abo
ve ID unit, ther
mal insulati
on is required as it is possib
le
that condensation occurs on liquid pipe
. In case of the tank is installed, should restr
ict maxim
um allo
w
ab
le height diff
erence
. See figure 29 if this is installed.
Diff
erence in height betw
een adjacent indoor units (H2) ≤49ft.(15m)
Example unit 8:
b + c + d + e + f + g + p
≤
100ft.
(30.5m)
Pipe length from first refr
iger
ant br
anch kit (either refnet joint or refnet header ) to indoor unit ≤ 100ft.(30.5m)
Example unit 8:
i ≤100ft.(30.5m)
Example unit 6:
b + h ≤131ft.(40m), unit 8:i + k ≤100ft.(30.5m)
Refrig
erant branc
h kit selection
Use refnet joint from the f
ollo
wing tab
le
.
RXSQ60 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.
RXSQ60 type
KHRP26M22H9(Max.
4 br
anch)
KHRP26M33H9(Max.
8 br
anch)
Outdoor unit capacity type
Connection pipe siz
e
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)
5/8”
(15.9mm)
3/8”
(9.5mm)
Gas pipe
Liquid pipe
24 · 30 · 36 ·
48 ·54 type
1/2”
(12.7mm)
1/4”
(6.4mm)
5/8”
(15.9mm)
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
Refr
iger
ant br
anch kits can only be
used with R410A.
Refrig
erant branc
h kit name
(Unit:
in.)
5/8
(15.9mm)
3/4
(19.1mm)
7/8
(22.2mm)
1-1/8
(28.6mm)
Use f
or m
ulti connection
Gas pipe
Outdoor unit
capacity type
3/8
(9.5mm)
Liquid pipe
RXSQ60 type
(Unit:
in.)
5/8
(15.9mm)
3/4
(19.1mm)
7/8
(22.2mm)
1-1/8
(28.6mm)
Use f
or pair connection
Gas pipe
Outdoor unit
capacity type
3/8
(9.5mm)
Liquid pipe
RXSQ60 type
: Standard siz
e
: A
v
ailab
le
: Not a
v
ailab
le
Pipe siz
e selection
<Coution on selecting connection pipes>
Usab
le e
xisting gas pipe
CXTQ**
24 type
36 type
48 type
60 type
3/4”
(19.1mm)
7/8”
(22.2mm)
1-1/8”
(28.6mm)
1-1/8”
(28.6mm)
01_EN_3P591321-3B.fm Page 10 Tuesday, December 24, 2019 10:28 AM
