One o
u
tdoor
u
nit installed
Branch with REFNET joint
Branch with REFNET joint and REFNET header
Branch with REFNET header
a
A
B
C
D
E
F
G
A
B
C
D
E
F
G
b
c
d
e
f
g
h
i
j
k
l
m
n
1
2
3
4
5
6
7
8
H2
H1
P
O
u
tdoor
u
nit
REF
N
ET joint ( - )
Indoor
u
nits ( - )
H1
H1
H2
H2
a
a
i
b
a
i
b
c
d
e
f
g
h
1
2
3
4
5
6
O
u
tdoor
u
nit
O
u
tdoor
u
nit
REF
N
ET joint ( • )
Indoor
u
nits ( - )
c
d
e
f
g
h
1
2
3
4
5
6
Indoor
u
nits ( - )
REF
N
ET header
REF
N
ET header
k
j
7
8
k
j
7
8
H1
H2
H2
O
u
tdoor
u
nit
REF
N
ET header
Indoor
u
nits ( - )
c
d
e
f
g
h
i
i
b
1
2
3
4
5
6
7
8
8
a
b
c
d
e
f
g
8
H2
H1
H3
H3
P
Indoor
u
nits ( - )
O
u
tdoor
u
nit
REF
N
ET joint ( - )
REF
N
ET joint ( • )
h
i
j
k
l
m
n
1
2
3
4
5
6
7
First o
u
tdoor
b
ranch
H1
H3
a
O
u
tdoor
u
nit
REF
N
ET header
Indoor
u
nits ( - )
c
d
e
f
g
h
b
1
2
3
4
5
6
7
M
u
ltiple o
u
tdoor
u
nits installed
∗
In case of m
u
ltiple o
u
tdoor
u
nits installed, re-read to
the first o
u
tdoor
b
ranch as seen from the indoor
u
nit.
Maxim
u
m
allo
w
a
b
le
length
Bet
w
een o
u
tdoor
and indoor
u
nits
Bet
w
een o
u
tdoor
b
ranch and indoor
u
nit
(Only for m
u
ltiple o
u
tdoor
u
nits)
Bet
w
een o
u
tdoor and indoor
u
nits
Bet
w
een indoor and indoor
u
nits
Bet
w
een o
u
tdoor and o
u
tdoor
u
nits
Act
u
al pipe length
Act
u
al pipe length
Act
u
al pipe length
Difference in height
Difference in height
Difference in height
E
qu
i
v
alent length
Total extension length
Pipe length
b
et
w
een o
u
tdoor and indoor
u
nits
≤
492ft.
Example
u
nit
8
: a +
b
+ c + d + e + f + g + p
≤
492ft.
Example
u
nit
8
:
b
+ c + d + e + f + g + p
≤
130ft.
E
qu
i
v
alent pipe length
b
et
w
een o
u
tdoor and indoor
u
nits
≤
575ft. (ass
u
me e
qu
i
v
alent pipe length of REF
N
ET joint to
b
e 1.6ft., that of REF
N
ET header to
b
e 3.3ft. calc
u
lation p
u
rposes)
Piping length from o
u
tdoor
b
ranch to o
u
tdoor
u
nit
≤
33ft. Approximately length: max 43ft.
Difference in height
b
et
w
een o
u
tdoor and indoor
u
nits (H1)
≤
164ft. (Max 130ft. if the o
u
tdoor
u
nit is
b
elo
w
)
Difference in height
b
et
w
een adjacent indoor
u
nits (H2)
≤
49ft.
Difference in height
b
et
w
een o
u
tdoor
u
nit (main) and o
u
tdoor
u
nit (s
ub
) (H3)
≤
16ft.
Pipe length from first refrigerant
b
ranch kit (either REF
N
ET joint or REF
N
ET header ) to indoor
u
nit
≤
130ft.
Total piping length from o
u
tdoor
u
nit* to all indoor
u
nits
≤
950ft.
Allo
w
a
b
le
height
length
Allo
w
a
b
le length after the
b
ranch
Refri
g
erant branch kit selection
Pipe size selection
Example
u
nit
8
: a + i
≤
492ft.
Example
u
nit 6: a +
b
+ h
≤
330ft.,
u
nit
8
: a + i + k
≤
492ft.
Example
u
nit
8
: i
≤
130ft.
Example
u
nit 6:
b
+ h
≤
130ft.,
u
nit
8
:i + k
≤
130ft.
r
t
O
u
tdoor
u
nit
r
≤
33ft. (Approximately length: max 43ft.)
t
≤
33ft. (Approximately length: max 43ft.)
Refrigerant
b
ranch kits can only
b
e
u
sed
w
ith R-410A.
Ho
w
to select the REF
N
ET joint
•
W
hen
u
sing REF
N
ET joints at the first
b
ranch co
u
nted from the o
u
tdoor
u
nit side, choose from the follo
w
ing ta
b
le
in accordance
w
ith the capacity of the o
u
tdoor
u
nit.
Piping
b
et
w
een o
u
tdoor
u
nits and refrigerant
b
ranch kit (part A)
• Match to the size of the connection piping on the o
u
tdoor
u
nit.
O
u
tdoor
u
nit connection piping size
Piping
b
et
w
een refrigerant
b
ranch kits
• Choose from the follo
w
ing ta
b
le in accordance
w
ith the total capacity of all the
indoor
u
nits connected
b
elo
w
this.
• Do not let the connection piping exceed the refrigerant piping size chosen
b
y
general system model name.
How to calculate the additional refri
g
erant
to be char
g
ed
If a negati
v
e res
u
lt is gotten for R from the form
u
la at right, no refrigerant
needs to
b
e added.
Additional referigerant to
b
e charged R (l
b
.)
R sho
u
ld
b
e ro
u
nded off in
u
nits of 0.1 (l
b
.).
Piping
b
et
w
een o
u
tdoor
b
ranch and o
u
tdoor
u
nit (part B)
Oil-e
qu
alizing line (part C)
Piping
b
et
w
een o
u
tdoor
u
nits and refrigerant
b
ranch kit (part A)
RXYQ72/96
RXYQ144/16
8
/192
KHRP26M22T, KHRP26M33T
KHRP26M22T, KHRP26M33T, KHRP26M72TU
• For REF
N
ET joints other than the first
b
ranch, select the proper
b
ranch kit model
b
ased on the total capacity
index.
< 72
72
≤
x < 111
111
≤
KHRP26M22T
KHRP26M33T
KHRP26M72TU
Ho
w
to select the REF
N
ET header
• Choose from the follo
w
ing ta
b
le in accordance
w
ith the total capacity of all the indoor
u
nits connected
b
elo
w
the REF
N
ET
header.
< 72
< 111
111
≤
KHRP26M22H (Max. 4 kit)
KHRP26M33H (Max.
8
kit)
KHRP26M72H (Max.
8
kit)
In case of m
u
ltiple o
u
tdoor
u
nits installed,
u
se o
u
tdoor
b
ranch kit.
2
u
nits
BHFP22M90U
example in case of REF
N
ET joint C; indoor
u
nits 3 + 4 + 5 + 6 + 7 +
8
example in case of REF
N
ET joint B indoor
u
nits 7 +
8
,
example in case of REF
N
ET header; indoor
u
nits 1 + 2 + 3 + 4 + 5 + 6
example in case of REF
N
ET header; indoor
u
nits 1 + 2 + 3 + 4 + 5 + 6 + 7 +
8
Example of do
w
nstream indoor
u
nits
RXYQ72
RXYQ96
RXYQ144/16
8
/192
φ
3/4
φ
7/
8
φ
1-1/
8
φ
3/
8
φ
3/
8
φ
5/
8
Gas pipe
indoor capacity index
Pipin
g
size
Li
q
uid pipe
φ
3/
8
φ
1/2
φ
5/
8
< 72
72
≤
x < 111
111
≤
x < 156
156
≤
φ
5/
8
φ
7/
8
φ
1-1/
8
Bet
w
een refrigerant
b
ranch kit and indoor
u
nit
• Pipe size for direct connection to indoor
u
nit m
u
st
b
e the same as the
connection size of indoor
u
nit.
φ
1/4
φ
3/
8
07, 09, 12, 1
8
type
24, 30, 36, 4
8
type
φ
1/2
φ
5/
8
Piping
b
et
w
een o
u
tdoor
b
ranch and o
u
tdoor
u
nit (part B)
Gas pipe
outdoor capacity type
Pipin
g
size
Li
q
uid pipe
φ
3/
8
φ
3/
8
RXYQ72
RXYQ96
φ
3/4
φ
7/
8
a:
φ
3/4 × 100ft.
b
:
φ
5/
8
× 30ft.
c:
φ
3/
8
× 30ft.
d:
φ
3/
8
× 30ft.
e:
φ
3/
8
× 30ft.
f :
φ
3/
8
× 30ft.
g:
φ
1/4 × 30ft.
h:
φ
1/4 × 70ft.
i :
φ
1/2 × 30ft.
j :
φ
1/4 × 30ft.
k:
φ
1/4 × 25ft.
Oil-e
qu
alizing line (Only for m
u
ltiple o
u
tdoor
u
nits installed) (part C)
φ
1/4
Piping size
(Unit: in.)
(Unit: in.)
(Unit: in.)
(Unit: in.)
(Unit: in.)
R=
+
indoor capacity index
Refri
g
erant branch kit name
Number of outdoor units
Branch kit name
Outdoor unit capacity type
Refri
g
erant branch kit name
indoor capacity index
Refri
g
erant branch kit name
Gas pipe
Outdoor unit capacity type
Pipin
g
size
Li
q
uid pipe
Gas pipe
indoor capacity type
Pipin
g
size
Li
q
uid pipe
+
+
+
+
_
If the o
u
tdoor
u
nit is
RXYQ192
u
nits and the
piping lengths are as at
right
R= 100 0.16
8
+ 30 0.014 + 30 0.074 + 120 0.036 + 155 0.015 - 6.6 =22.4
8
5
b
a
c+d+e+f
g+h+j+k
i
22.5
N
OTE:
Total length (ft.)
of li
qu
id piping
size at
φ
7/
8
×0.235
Total length (ft.)
of li
qu
id piping
size at
φ
3/4
×0.16
8
Total length (ft.)
of li
qu
id piping
size at
φ
5/
8
×0.114
Total length (ft.)
of li
qu
id piping
size at
φ
1/2
×0.074
Total length (ft.)
of li
qu
id piping
size at
φ
3/
8
×0.036
Total length (ft.)
of li
qu
id piping
size at
φ
1/4
×0.015
Model name
RXYQ72/96
RXYQ144/16
8
/192
0 l
b
.
6.6 l
b
.
Amo
u
nt of refrigerant
Example for refrigerant
b
ranch
u
sing REF
N
ET joint and REF
N
ET header for
RXYQ192
A
B
A
B
Caution
The thickness and material shall
b
e selected in accordance
w
ith local code.
For an o
u
tdoor
u
nit m
u
lti installation, make the settings in accordance
w
ith the
follo
w
ing fig
u
re.
A
G
1
8
1
8
1
8
A
B
A
B
1
8
indoor
u
nit
REF
N
ET joint
REF
N
ET header
1
A
A
G
1
8
1
8
