Daikin VRV IV+ RYYQ12U7Y1B Series Installer And User Manual page 14

5 Preparation
3 BP box
4,5 RA DX indoor unit
a,b Indoor branch kit
x,y Outdoor multi connection kit
A, B, C: Piping between outdoor unit and (first)
refrigerant branch kit
Choose from the following table in accordance with the outdoor unit
total capacity type, connected downstream.
Outdoor unit Piping outer diameter size (mm)
capacity type (HP)
Gas pipe
8
10
12~16
18~22
24
26~34
36~54
D: Piping between refrigerant branch kits
Choose from the following table in accordance with the indoor unit
total capacity type, connected downstream. Do not let the
connection piping exceed the refrigerant piping size chosen by the
general system model name.
Indoor unit capacity Piping outer diameter size (mm)
index
Gas pipe
<150
150≤x<200
200≤x<290
290≤x<420
420≤x<640
640≤x<920
≥920
Example:
▪ Downstream capacity for E=capacity index of unit 1
▪ Downstream capacity for D=capacity index of unit 1+capacity
index of unit 2
E: Piping between refrigerant branch kit and
indoor unit
Pipe size for direct connection to indoor unit must be the same as
the connection size of the indoor unit (in case indoor unit is VRV DX
indoor or Hydrobox).
Indoor unit capacity Piping outer diameter size (mm)
index
Gas pipe
15~50
63~140
200
250
▪ When the equivalent pipe length between outdoor and indoor
units is 90 m or more, the size of the main pipes (both gas side
and liquid side) must be increased. Depending on the length of the
piping, the capacity may drop, but even in such a case the size of
the main pipes has to be increased. More specifications can be
found in the technical engineering data book.
Installer and user reference guide
14
Liquid pipe
19.1 9.5
22.2 9.5
28.6 12.7
28.6 15.9
34.9 15.9
34.9 19.1
41.3 19.1
Liquid pipe
15.9 9.5
19.1
22.2
28.6 12.7
15.9
34.9 19.1
41.3
Liquid pipe
12.7 6.4
15.9 9.5
19.1
22.2
a
c
b
d
a Outdoor unit
b Main pipes
c Increase if the equivalent piping length is ≥90 m
d First refrigerant branch kit
e Indoor unit
Size up
HP class Piping outer diameter size (mm)
Gas pipe
8 19.1 → 22.2
10 22.2 → 25.4
(b)
12+14 28.6
16 28.6 → 31.8
18~22
(b)
24 34.9
26~34 34.9 → 38.1
(b)
36~54 41.3
(a) If the size-up size is NOT available, you must use the
standard size. Sizes bigger than the size-up size are NOT
allowed. But even if you use the standard size, the
equivalent piping length is allowed to be more than 90 m.
(b) Pipe size-up is NOT allowed.
▪ The pipe thickness of the refrigerant piping shall comply with the
applicable legislation. The minimal pipe thickness for R410A
piping must be in accordance with the table below.
Pipe Ø (mm)
6.4/9.5/12.7
15.9
19.1/22.2
28.6
34.9
41.3
▪ In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the
following into account:
▪ Select the pipe size nearest to the required size.
▪ Use the suitable adapters for the change-over from inch to mm
pipes (field supply).
▪ The additional refrigerant calculation has to be adjusted as
mentioned in "6.7.3 To determine the additional refrigerant
amount" on page 27.
F: Piping between refrigerant branch kit and BP
unit
Pipe size for direct connection on BP unit must be based on the total
capacity of the connected indoor units (only in case RA DX indoor
units are connected).
Total capacity index Piping outer diameter size (mm)
of connected indoor
Gas pipe
units
20~62
63~149
150~208
Example:
Downstream capacity for F=[capacity index of unit 4]+[capacity index
of unit 5]
e
Liquid pipe
9.5 → 12.7
(a)
12.7 → 15.9
(a)
15.9 → 19.1
(a)
19.1 → 22.2
Minimal thickness t (mm)
0.80
0.99
0.80
0.99
1.21
1.43
Liquid pipe
12.7 6.4
15.9 9.5
19.1
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09