Daikin REYQ20M7W1B [30/32] Refnet pipe selection
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Daikin REYQ20M7W1B [30/32] Refnet pipe selection

Daikin REYQ16M7W1B [30/32] Refnet pipe selection
4
• Systems • Selection procedure
29
• Selection procedure
5 REFNET pipe selection
5-2 REYQ8~48
One outdoor
unit installed
(REYQ8~16)
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
branch
H3
Outdoor unit
When multiple
outdoor units
are installed
(REYQ18~)
Maximum
allowable
length
Between outdoor
and indoor units
Between outdoor branch and indoor unit
(Only for REYQ18 or more)
Between outdoor and indoor units
Between indoor and indoor units
Between outdoor and outdoor units
Actual pipe length
Actual pipe length
Actual pipe length
Difference in height
Difference in height
Difference in height
Equivalent length
Total extension length
Pipe length between 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
Equivalent pipe length between outdoor and indoor units ≤ 175m (assume equivalent pipe length of REFNET joint to be 0.5m, that of REFNET header to be 1m, calculation purposes)
Piping length from outdoor branch to outdoor unit ≤ 10m (Approximate length: max 13m)
Difference in height between outdoor and indoor units (H1) ≤ 50m (Max 40m if the outdoor unit is below)
Difference in height between adjacent indoor units (H2) ≤ 15m
Difference in height between outdoor unit (main) and outdoor unit (sub) (H3)
≤ 5m
Pipe length from first refrigerant branch kit (either REFNET joint or REFNET header ) to indoor unit
≤ 40m
Total piping length from outdoor unit* to all indoor units ≤ 300m
Allowable
height length
Allowable length after the branch
Refrigerant branch kit selection
Pipe size selection
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 (Equivalent length: max 13m)
s ≤ 10m (Equivalent length: max 13m)
t ≤ 10m (Equivalent length: max 13m)
How to select the REFNET joint
• When using REFNET joints at the first branch counted from the outdoor unit side.
Choose from the following table in accordance with the capacity of the outdoor unit.
Piping between outdoor unit and refrigerant branch kit (part A)
• Match to the size of the connection piping on the outdoor unit.
For an outdoor unit multi installation (REYQ18~48MY1B), make the
settings in accordance with the following figure.
How to calculate the additional refrigerant
to be charged
If a negative result is gotten for R from the formula at right, no refrigerant
needs to be added.
Additional refrigerant to be charged R (Kg)
R should be rounded off in units of 0.1Kg.
Piping between outdoor branch
and outdoor unit (part C)
Oil-equalizing line (part D)
Piping between outdoor branches (part B)
Piping between outdoor unit and refrigerant
branch kit (part A)
REYQ8, 10 type
REYQ12~22 type
REYQ24 type ~
KHRQ23M29T7
KHRQ23M64T7
KHRQ23M75T7
• For REFNET joints other than the first branch, select the proper branch kit model based on the total capacity index.
< 200
200 ≤ x < 290
290 ≤ x < 640
640 <
KHRQ23M20T7
KHRQ23M29T7
KHRQ23M64T7
KHRQ23M75T7
KHRQ22M20T7
KHRQ22M29T7
KHRQ22M64T7
-
How to select the refnet header
• Choose from the following table in accordance with the total capacity of all the indoor units connected below the REFNET head
er.
• Note: 250 type cannot be connected below the REFNET header.
< 200
200 ≤ x < 290
290 ≤ x < 640
640 <
KHRQ23M29H7
KHRQ23M64H7
KHRQ23M75H7
KHRQ22M29H7
KHRQ22M64H7
-
How to choose an outdoor branch kit (needed if the outdoor unit capacity type is REYQ18 or more.)
• Choose from the following table in accordance with the number of outdoor units.
2 units
3 units
BHFQ23M907
BHFQ23M1357
example in case of REFNET joint C; indoor units 3 + 4 + 5 + 6 + 7 + 8
example in case of REFNET joint B indoor units 7 + 8,
example in case of REFNET header; indoor units 1 + 2 + 3 + 4 + 5 + 6
example in case of REFNET header; indoor units 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8
Example of downstream indoor units
ø 9.5
ø 12.7
ø 15.9
ø 19.1
ø 19.1
ø 22.2
ø 28.6
ø 34.9
ø 41.3
ø 15.9
ø 19.1
ø 22.2
ø 28.6
ø 34.9
REYQ8
REYQ10
REYQ12
REYQ14, 16
REYQ18, 20
REYQ24
REYQ22
REYQ26~34
REYQ36
REYQ38~48
a: ø 19.1 x 30m
b: ø 15.9 x 10m
c: ø 9.5 x 10m
d: ø 9.5 x 10m
e: ø 9.5 x 10m
f: ø 9.5 x 10m
g: ø 6.4 x 10m
h: ø 6.4 x 20m
i: ø 12.7 x 10m
j: ø 6.4 x 10m
k: ø 6.4 x 9m 1
(Unit:mm)
R=
indoor capacity index
REFNET header
Number of outdoor units
Outdoor unit capacity type
REFNET joint
indoor capacity index
REFNET joint
Gas pipe
Suction
In case of 3 pipes In case of 2 pipes
Discharge
Outdoor unit
capacity type
Liquid pipe
+
x 1.15
_
+
+
+
+
If the outdoor unit is
REYQ34MY1B and the
piping lengths are as at
right
R= 30 x 0.25 + 10 x 0.17 + 10 x 0.11 + 40 x 0.054 + 49 x 0.022 x 1.15 - 6 = 9.569
ba c+d+e+f g+h+j+ki
9.6
Total length (m)
of liquid piping
size at ø22.2
x 0.35
Total length (m)
of liquid piping
size at ø19.1
x 0.25
Total length (m)
of liquid piping
size at ø15.9
x 0.17
Total length (m)
of liquid piping
size at ø12.7
x 0.11
Total length (m)
of liquid piping
size at ø9.5
x 0.054
Total length (m)
of liquid piping
size at ø6.4
x 0.022
Model name
REYQ8~16MY1B
REYQ18~32MY1B
REYQ34~48MY1B
0 kg
3 kg
6 kg
Amount of refrigerant
Example for refrigerant branch using refnet joint and REFNET header for REYQ34MY1B
Outdoor unit
BS unit
)
Indoor unit
)
Cool/Heat selection possible )
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
78
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
)
Indoor unit )
Cool/Heat selection possible
)
Cooling only
(
.
)
H2
H1
REFNET header
Between BS unit (refrigerant branch kit) and indoor unit
• Pipe size for direct connection to indoor unit must be the same as the
connection size of indoor unit.
The BS unit (BSVQ100MV1) port and connection pipe are different sizes.
Use the reducing joints included with the BS unit.
When the indoor capacity is 160 ≤ x < 200.
Use the reducing joints included with the BS unit.
ø 6.4
ø 9.5
20, 25, 32, 40, 50
63, 80, 100, 125
200
250
ø 12.7
ø 15.9
ø 19.1
ø 22.2
(Unit:mm)
Gas pipe
indoor capacity index
Liquid pipe
Between two immediately adjacent refrigerant branch kits and BS unit
• Choose from the following table in accordance with the total capacity of all the
indoor units connected below this.
• Do not let the connection piping exceed the refrigerant piping size chosen by
general system model name.
Suction
Gas pipe
indoor capacity
index
Discharge
Liquid pipe
ø 6.4
ø 9.5
ø 15.9
ø 12.7
ø 19.1
< 63
63 ≤ x < 200
200 ≤ x < 290
290 ≤ x < 420
420 ≤ x < 640
640 ≤ x < 920
920 ≤
ø 12.7
ø 15.9
ø 22.2
ø 28.6
ø 34.9
ø 41.3
ø 9.5
ø 28.6
ø 12.7
ø 19.1
(Unit:mm)
Piping between outdoor branch and outdoor unit (part C)
Gas pipe
Suction Discharge
outdoor capacity
type
Liquid pipe
ø 15.9
ø 19.1
ø 22.2
ø 9.5
ø 12.7
REYQ8
REYQ10
REYQ12
REYQ14, 16
ø 28.6
ø 19.1
ø 22.2
Oil-equalizing line (Only for REYQ18 or more) (part D)
ø 6.4
Piping size (outer diameter minimum thickness)
(Unit:mm)
(Unit:mm)
Piping between outdoor branches (part B)
• Choose from the following table in accordance with the total capacity of all the
outdoor units connected above this.
ø 28.6
ø 34.9
ø 22.2
ø 28.6
ø 15.9
ø 19.1
REYQ18
REYQ20, 22
REYQ24
REYQ26 <
(Unit:mm)
outdoor capacity
index
Liquid pipe
Gas pipe
Suction Discharge
Maximum piping stretch > 90m equivalent:
Increase diameter of the MAIN liquid pipe AND gas pipe for the whole range
ø 9.5
ø 12.7
ø 15.9
ø 19.1
ø 12.7
ø 15.9
ø 19.1
ø 22.2
REYQ8, 10
REYQ12, 14, 16
REYQ18~24
REYQ26~48
(Unit:mm)
Main liquid pipe size
Outdoor unit
capacity type
Piping size
Piping size
Piping size
Piping size
Piping size
Piping size
Nomal size Size up
In case of 3 pipes In case of 2 pipes
indoor unit
REFNET joint
REFNET header
Outdoor
unit
Indoor
unit
Discharge gas pipe
(3 pipes) (2 pipes)
Suction gas pipe
Liquid pipe
Gas pipe
Liquid pipe
BS
unit
1
A
REFNET joint )
A
G
F
B1
BS unit
)
B1 ~ B4
Indoor unit
)
1 ~ 8
1
~ 8
1
~ 6
1 ~ 6
Cool/Heat selection possible
Cool/Heat selection possible
)
Cooling only
(
.
)
7
8
1
h
f
gik
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 ~
A ~
G
F
B1
BS unit )
B1 ~ B4
Indoor unit )
)
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
ABAB
B5
Indoor unit )
Cool/Heat selection possible
,
.
)
1 ~ 4 7 8
1
~ 478
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 (
.
)
B5
B1 B5
Indoor unit
)
Cool/Heat selection possible
,
.
)
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
NOTE
B1 ~ B5
1 ~ 8
1
~ 8
AB
1 ~ 6
1
~ 6
B1 ~ B6
1 ~ 8
B1 ~ B6
1 ~ 8
First branch after the outdoor unit has to be selected
from "Outdoor unit capacity type" table. Even if it is
contradictory to the "indoor capacity index" table.
Refrigerant branch kits can only be
used with R-410A.
NOTE
Please note that connectable indoor unit for BSVQ250M is from size 50 onwards. This means that indoor size 20 to 40 should NOT
be connected to BSVQ250M. The explanation of possible trouble is that there is mainly a problem with the refrigerant side: if o
nly this BSVQ is in heating, and all the other BSVQ are in cooling ,
there is a high risk of liquid back to the suction side (by insufficient evaporation of liquid used for extra subcool). If such
operation of BSVQ250M runs for a while with an indoor thermostat-on of index 40 or less, it can result in compressor failure.
The communication itself will work as the BSVQ does not know its size, so it
can not check if indoor index is correct or not.

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