Example Of Connection - Daikin VRV II Series Design, Installation & Testing Instructions

Si39-303
6.3

Example of Connection

Example of connection

(Connection of 8 indoor units Heat pump system)
∗ If the system capacity is RXYQ18 or more, re-read to
the first outdoor branch as seen from the indoor unit.
Between outdoor
Maximum and indoor units
allowable
length
Between outdoor branch and indoor unit
(Only for RXYQ18 or more)
Between outdoor and indoor units
Allowable
height Between indoor and indoor units
length
Between outdoor and outdoor units
Allowable length after the branch
Refrigerant branch kit selection
Refrigerant branch kits can only be
used with R410A.
Example of downstream indoor units
Pipe size selection
For an outdoor unit multi installation (RXYQ18~48MY1B), make the
settings in accordance with the following figure.
Oil-equalizing line (part D)
Piping between outdoor branch
and indoor unit (part C)
Piping between outdoor branches (part B)
Piping between outdoor unit and refrigerant
branch kit (part A)
How to calculate the additional refrigerant
to be charged
Additional referigerant to be charged R (Kg)
R should be rounded off in units of 0.1Kg.
NOTE:
If a negative result is gotten for R from the formula at right, no refrigerant
needs to be added.
Installation Manual
Branch with refnet joint
REFNET joint (A-G)
Outdoor unit
One outdoor
unit installed a b c d e f
A B C D E F
(RXYQ5~16)
h i j k l m
1 2 3 4 5
Indoor units (1-8)
Outdoor unit
REFNET joint (A-G)
First outdoor H3
When multiple
branch
outdoor units
a b c d e f
installed A B C D E F
h i j k l
1 2 3 4 5
(RXYQ18~)
Indoor units (1-8)
Pipe length between outdoor and indoor units ≤ 150m
Actual pipe length
Example unit 8: a + b + c + d + e + f + g + p ≤ 150m
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)
Equivalent length
Total piping length from outdoor unit* to all indoor units ≤ 300m
Total extension length
Actual pipe length
Piping length from outdoor branch to outdoor unit
Difference in height between outdoor and indoor units (H1) ≤ 50m
Difference in height
Difference in height between adjacent indoor units (H2) ≤ 15m
Difference in height
Difference in height between outdoor unit (main) and outdoor unit (sub) (H3) ≤ 5m
Difference in height
Pipe length from first refrigerant branch kit (either refnet joint or refnet header ) to indoor unit ≤ 40m
Actual pipe length
Example unit 8: b + c + d + e + f + g + p ≤ 40m
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.
Outdoor unit capacity type
RXYQ5 type
RXYQ8, 10 type
RXYQ12~22 type
RXYQ24 type~
• For refnet joints other than the first branch, select the proper branch kit model based on the total capacity index.
indoor capacity index
< 200
200 ≤ x< 290
290 ≤ x< 640
640 <
example in case of refnet joint C; indoor units 3 + 4 + 5 + 6 + 7 + 8
Piping between outdoor unit and refrigerant branch kit (part A)
• Match to the size of the connection piping on the outdoor unit.
Outdoor unit connection piping size
Piping size (outer diameter x minimum thickness)
Outdoor unit capacity type
Gas pipe
φ15.9 × 0.99
RXYQ5 type
φ19.1 × 0.80
RXYQ8 type
φ22.2 × 0.80
RXYQ10 type
RXYQ12, 14, 16 type
φ28.6 × 0.99
RXYQ18~22 type
RXYQ24 type
φ34.9 × 1.21
RXYQ26~34 type
φ41.3 × 1.43
RXYQ36~48 type
  
Total length (m) Total length (m)
  
R= +
of liquid piping ×0.35 of liquid piping
  
size at φ22.2 size at φ19.1

Total length (m)

+
of liquid piping

size at φ9.5
Branch with refnet joint and refnet header
Outdoor unit
a
A
g
b
H1 H1
Refnet header
G
P
n
c d e
6 7 H2
1 2 3
8
Indoor units (1-8)
Outdoor unit
H3
a
g
H1 A
H1 b
P
G Refnet header
m n
6 7 H2
c d e
8 1 2 3
Indoor units (1-8)
Example unit 6: a + b + h ≤ 150m, unit 8: a + i + k ≤ 150m
≤ 10m
Approximately length: max 13m
(Max 40m if the outdoor unit is below)
Example unit 6: b + h ≤ 40m, unit 8:i + k ≤ 40m
Refrigerant branch kit name
KHRP26M22T
KHRP26M33T
KHRP26M72T
KHRP26M73T + KHRP73TP
Refrigerant branch kit name
KHRP26M22T
KHRP26M33T
KHRP26M72T
KHRP26M73T + KHRP73TP
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
Piping between refrigerant branch kits
• Choose from the following table in accordance with the total capacity of all the
indoor units connected below this.
(Unit:mm)
• Do not let the connection piping exceed the refrigerant piping size chosen by
general system model name.
Liquid pipe
indoor capacity index
φ9.5 × 0.80
< 200
200 ≤ x< 290
φ12.7 × 0.80
290 ≤ x< 420
φ15.9 × 0.99
420 ≤ x< 640
640 ≤ x< 920
φ19.1 × 0.80
920 <
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.
outdoor capacity index
< 22HP
24HP
26HP <
    
Total length (m) Total length (m)
    
+ +
×0.25 of liquid piping ×0.17 of liquid piping ×0.11
    
size at φ15.9 size at φ12.7
Model name
  
Total length (m)
RXYQ5~16MY1B
  
+ _
of liquid piping
×0.054 ×0.022
  
RXYQ18~32MY1B
size at φ6.4
RXYQ34~48MY1B
Branch with refnet header
Outdoor unit
REFNET joint (A • B)
i
a
B
k
j
7 8
H2
f g h b c
4 5 6 1
Outdoor unit
REFNET joint (A • B)
i
a
B
k
j
7 8
H2
g
f h
b c
4 5 6 1
Example unit 8: a + i ≤ 150m
Outdoor unit
s
r
Example unit 8: i ≤ 40m
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 header.
• Note: 250 type cannot be connected below the REFNET header.
indoor capacity index Refrigerant branch kit name
< 200 KHRP26M22H (Max. 4 kit)
KHRP26M33H (Max. 8 kit)
< 290
290 ≤ x< 640
KHRP26M72H (Max. 8 kit)
640 < KHRP26M73H (Max. 8 kit) + KHRP26M73HP
How to choose an outdoor branch kit (needed if the outdoor unit capacity type is RXYQ18 or more.)
• Choose from the following table in accordance with the number of outdoor units.
Number of outdoor units
2 unit BHFP22M90 + BHFP22M90P
3 unit
BHFP22M135 + BHFP22M135P
example in the case of refnet header; indoor units 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8
Between 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.
(Unit:mm)
indoor capacity type
Piping size (outer diameter x minimum thickness)
Gas pipe Liquid pipe
20, 25, 32, 40, 50 type
φ15.9 × 0.99
63, 80, 100, 125 type
φ9.5 × 0.80
φ22.2 × 0.80
200 type
φ12.7 × 0.80
250 type
φ28.6 × 0.99
φ15.9 × 0.99
φ34.9 × 1.21 Piping between outdoor branch and indoor unit (part C)
φ19.1 × 0.80
φ41.3 × 1.43
outdoor capacity type
RXYQ8 type
RXYQ10 type
(Unit:mm)
RXYQ12, 14, 16 type
Piping size (outer diameter x minimum thickness)
Gas pipe Liquid pipe
Oil-equalizing line (Only for RXYQ18 or more) (part D)
φ28.6 × 0.99
φ15.9 × 0.99
Piping size (outer diameter x minimum thickness)
φ34.9 × 1.21
φ19.1 × 0.80
Example for refrigerant branch using refnet joint and refnet header for RXYQ34MY1B
If the outdoor unit is
a: φ19.1 × 30m
RXYQ34MY1B and the
b: φ15.9 × 10m
piping lengths are as at
c: φ09.5 × 10m
right
Amount of refrigerant
0 kg
R= 30 0.25 + 10 0.17 + 10 0.11 + 40 0.054 + 49 0.022 - 6 =7.538
3 kg
6 kg
a b i c+d+e+f g+h+j+k
Refrigerant Piping
Refnet header
H1
g
d e f h
2 3 4 5 6 7
H2
8
Indoor units (1-8)
Refnet header
H3
H1
i
f g
d e h
2 3 4 5 6 7 H2
Indoor units (1-8) 8
r ≤ 10m (Approximately length: max 13m)
s ≤ 10m (Approximately length: max 13m)
t ≤ 10m (Approximately length: max 13m)
t
Branch kit name
(Unit:mm)
Piping size (outer diameter x minimum thickness)
Gas pipe Liquid pipe
φ12.7 × 0.80
φ6.4 × 0.80
φ15.9 × 0.99
φ19.1 × 0.80 φ9.5 × 0.80
φ22.2 × 0.80
(Unit:mm)
Piping size (outer diameter x minimum thickness)
Gas pipe Liquid pipe
φ19.1 × 0.80
φ9.5 × 0.80
φ22.2 × 0.80
φ28.6 × 0.99 φ12.7 × 0.80
φ6.4 × 0.80
(Unit:mm)
d: φ9.5 × 10m g: φ16.4 × 10m j : φ16.4 × 10m
e: φ9.5 × 10m h: φ16.4 × 20m k: φ16.4 × 19m
f : φ9.5 × 10m i : φ12.7 × 10m
7.5
173