12
6-3 Example of connection
One outdoor
unit installed
Branch with REFNET joint
Branch with REFNET joint and REFNET header
Branch with REFNET header
Outdoor unit
Outdoor unit
H3
H3
Outdoor unit
First outdoor
br
anch
H3
Outdoor unit
Multiple
outdoor units
installed
Maxim
um
allo
w
a
b
le
length
Betw
een outdoor
and indoor units
Betw
een outdoor br
anch and outdoor unit
(Only f
or m
ultiple outdoor units)
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
≤
330ft.
Example unit 8:
a + b + c + d + e + s
≤
330ft.
Example unit 8:
a + b + c + d + e +s
≤
130ft.
Equiv
alent pipe length betw
een outdoor and indoor units
≤
390ft.
(assume equiv
alent pipe length of REFNET joint to be 1.6ft., that of REFNET header to be 3.3ft., that of BSVQ36, 60 to
be 13ft.
calculation pur
poses)
Piping length from outdoor br
anch to outdoor unit
≤
33ft.
Equiv
alent length:
max 43ft.
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.
Diff
erence in height betw
een outdoor unit (main) and outdoor unit (sub) (H3)
≤
16ft.
Pipe length from first refr
iger
ant br
anch kit (either REFNET joint or REFNET header ) to indoor unit
≤
130ft.
T
otal piping length from outdoor unit* to all indoor units
≤
950ft.
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
Example unit 8:
a + o
≤
330ft.
Example unit 6:
a + b + l
≤
330ft., unit 8:
a + m + n + p
≤
330ft.
Example unit 8:
o
≤
130ft.
Example unit 6:
b + l
≤
130ft., unit 8:m + n + p
≤
130ft.
r
t
Outdoor unit
r
≤
33ft.
(Equiv
aqlent length:
max 43ft.)
t
≤
33ft.
(Equiv
aqlent length:
max 43ft.)
Refr
iger
ant br
anch kits can only be
used with R410A.
Piping from BS unit to indoor unit and piping from
refr
iger
ant br
anch kit to indoor unit used as cooling only
m
ust be composed b
y
2 pipes (Suction Gas pipe and
Liquid pipe)
*If case of m
ultiple outdoor units installed, re-read to the
first outdoor br
anch as seen from the indoor unit.
Ho
w to select the REFNET joint
•
When using REFNET joint 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.
F
or an outdoor unit m
ulti installation, 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 (lb
.)
R should be rounded off in units of 0.1(lb
.).
Piping betw
een outdoor br
anch
and outdoor unit (par
t B)
Oil-equalizing line (par
t C)
Piping betw
een outdoor units and refr
iger
ant
br
anch kit (par
t A)
REYQ96
REYQ192
KHRP25M33T
KHRP25M72TU
•
F
or REFNET joint other than the first br
anch, select the proper br
anch kit model based on the total capacity
< 72
72
≤
x< 111
111
≤
KHRP25M22T
KHRP25M33T
KHRP25M72TU
KHRP26M22T
KHRP26M33T
KHRP26M72TU
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
.
< 72
72
≤
x< 111
111
≤
KHRP25M33H
KHRP25M72H
KHRP26M22H or KHRP26M33H
KHRP26M33H
KHRP26M72H
In case of m
ultiple outdoor units installed, use outdoor br
anch kit.
2 units
BHFP26M90U
e
xample in case of REFNET joint C;
indoor units 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
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.
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
indoor capacity inde
x
Refrig
erant branc
h kit name
In case of 3 pipes
In case of 2 pipes
+
+
×
1.15
_
++
If the outdoor unit is
REYQ192 and the
piping lengths are as
at r
ight
b
a
c+d+e+f
g+h+j+k
i
26.8
NO
TE:
T
otal length (ft.)
of liquid piping
siz
e at
φ
7/8
×
0.235
T
otal length (ft.)
of liquid piping
siz
e at
φ
3/4
×
0.168
T
otal length (ft.)
of liquid piping
siz
e at
φ
5/8
×
0.114
T
otal length (ft.)
of liquid piping
siz
e at
φ
1/2
×
0.074
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
Model name
REYQ96
REYQ192
0 lb
.
6.6 lb
.
Amount of refr
iger
ant
Example f
or refr
iger
ant br
anch using REFNET joint and REFNET header f
or
REYQ192
Outdoor unit
BS unit
( ~ )
B1
B6
Indoor unit
( ~ )
1
8
Cool/Heat selection
possib
le ( ~ )
1
6
Cooling only
(
.
)
7
8
H2
H1
a
i
h
4
B4
g
f
3
B3
e
d
2
B2
c
b
1
B1
k
j
5
B5
m
l
6
B6
n
7
o
8
REFNET header
BS unit
( ~ )
B1
B6
Indoor unit
( ~ )
1
8
Cool/Heat selection
possib
le ( ~ )
1
6
Cooling only
(
.
)
7
8
H2
H1
a
i
h
4
B4
g
f
3
B3
e
d
2
B2
c
b
1
B1
k
j
5
B5
m
l
6
B6
n
7
o
8
REFNET header
Betw
een BS unit (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.
∗
mar
k indicates the BS unit (BSVQ36MVJU) por
t and connection pipe are
diff
er
nt siz
es
. Use the reducing joints included with the BS unit.
φ
1/4
φ
3/8
∗
12, 18 type
24, 30, 36, 48 type
φ
1/2
φ
5/8
(Unit:in.)
Gas pipe
indoor capacity inde
x
Piping siz
e
Liquid pipe
Betw
een tw
o immediately adjacent refr
iger
ant br
anch kits and BS unit
•
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
.
•
When tw
o lines are connected betw
een tw
o adjacent refr
iger
ant br
anch kits
, select the proper
gas line siz
e based on data mentioned under
“suction gas line
” column in the tab
le abo
v
e
.
Suction
Gas pipe
indoor capacity
inde
x
Piping siz
e
Disc
har
g
e
Liquid pipe
φ
1/4
φ
3/8
φ
1/2
< 24
24
≤
x< 72
72
≤
x< 111
111
≤
φ
1/2
φ
5/8
φ
7/8
φ
1-1/8
φ
3/8
φ
1/2
φ
3/4
(Unit:in.)
Oil-equalizing line (Only f
or m
ultiple outdoor units installed) (par
t C)
φ
1/4
Piping siz
e
(Unit:in.)
Piping betw
een outdoor br
anch and outdoor unit (par
t B)
Gas pipe
Suction
Disc
har
g
e
outdoor capacity
type
Piping siz
e
Liquid pipe
φ
3/4
φ
3/8
REYQ96
φ
7/8
(Unit:in.)
Piping betw
een outdoor units and refr
iger
ant br
anch kit (par
t A)
•
Match to the siz
e of the connection piping on the outdoor unit.
φ
3/8
φ
7/8
φ
1-1/8
φ
7/8
φ
5/8
φ
3/4
REYQ96
REYQ192
(Unit:in.)
Gas pipe
Suction
Disc
har
g
e
Outdoor unit
capacity type
Piping siz
e
Liquid pipe
Pipe siz
e
, when o
verall equiv
alent pipe length is 295ft.
or more
.
•
When o
v
er
all equiv
alent pipe length is 295ft.
or more
, the siz
e of the main
liquid pipe (outdoor unit-br
anch sections) m
ust be increased.
(Only main liquid
pipe)
φ
3/8
φ
5/8
φ
1/2
φ
3/4
REYQ96
REYQ192
(Unit:in.)
Main liquid pipe siz
e
Outdoor unit
capacity type
Piping siz
e
Normal siz
e
Siz
e up
∗
In case of 3 pipes
In case of 2 pipes
indoor unit
REFNET joint
REFNET header
Outdoor unit side
Indoor unit side
Discharge gas pipe
(3 pipes)
(2 pipes)
Suction gas pipe
Liquid pipe
Gas pipe
Liquid pipe
BS
unit
1
A
REFNET joint
( ~ )
A
A
G
F
B1
BS unit
( ~ )
B1
B4
Indoor unit
( ~ )
1
8
Cool/Heat selection
possib
le ( ~ )
1
6
Cooling only
(
.
)
7
8
1
h
f
gi
k
b
m
a
l
c
G
2
j
3
4
B
B2
o
n
5
B3
q
p
6
B4
C
D
r
H2
H1
s
7
8
E
d
e
REFNET joint
( ~ )
A
A
G
F
B1
BS unit
( ~ )
B1
B4
Indoor unit
( ~ )
1
8
Cool/Heat selection
possib
le ( ~ )
1
6
Cooling only
(
.
)
7
8
1
h
f
gi
k
b
m
a
l
c
G
2
j
3
4
B
B2
o
n
5
B3
q
p
6
B4
C
D
r
H2
H1
s
7
8
E
d
e
Outdoor unit
BS unit
( ~ )
A
REFNET joint
(
.
)
A
B
B5
B1
B5
Indoor unit
( ~ )
1
8
Cool/Heat selection
possib
le ( ~ ,
.
)
1
4
7
8
Cooling only
(
.
)
56
d
c
1
B1
H2
H1
am
b
f
e
2
B2
h
g
3
B3
j
i
4
B4
k
5
l
o
n
p
6
7
8
B
REFNET header
BS unit
( ~ )
A
REFNET joint
(
.
)
A
B
B5
B1
B5
Indoor unit
( ~ )
1
8
Cool/Heat selection
possib
le ( ~ ,
.
)
1
4
7
8
Cooling only
(
.
)
56
d
c
1
B1
H2
H1
a
m
b
f
e
2
B2
h
g
3
B3
j
i
4
B4
k
5
l
o
n
p
6
7
8
B
REFNET header
R= 100
×
0.168 + 30
×
0.014 + 30
×
0.74 + 120
×
0.036 + 155
×
0.015
×
1.15- 6.6 =26.848
01_EN_3P114261-10Y.fm Page 12 Thursday, June 16, 2005 3:14 PM
