4 Preparation
Installation and operation manual
8
RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543426-1 – 2018.07
Indoor unit capacity
index
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
15~50
12.7
6.4
63~140
15.9
9.5
200
19.1
250
22.2
▪ 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.
a
e
b
c
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
Liquid pipe
8
19.1 → 22.2
9.5 → 12.7
10
22.2 → 25.4
(a)
12+14
28.6
(b)
12.7 → 15.9
16
28.6 → 31.8
(a)
18~22
15.9 → 19.1
24
34.9
(b)
26~34
34.9 → 38.1
(a)
19.1 → 22.2
36~42
41.3
(b)
(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)
Minimal thickness t (mm)
6.4/9.5/12.7
0.80
15.9
0.99
19.1/22.2
0.80
28.6
0.99
34.9
1.21
41.3
1.43
▪ 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
"5.6.3 To determine the additional refrigerant
.
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
of connected indoor
units
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
20~62
12.7
6.4
63~149
15.9
9.5
150~208
19.1
Example:
Downstream capacity for F=[capacity index of unit 4]+[capacity index
of unit 5]
G: Piping between BP unit and RA DX indoor unit
Only in case RA DX indoor units are connected.
Indoor unit capacity
index
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
20, 25, 30
9.5
6.4
50
12.7
60
9.5
71
15.9
4.2.3
To select refrigerant branch kits
Refrigerant refnets
For piping example, refer to
"4.2.2 To select the piping size" on
.
▪ 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 (example: refnet joint a).
Outdoor unit capacity type
(HP)
2 pipes
8~10
KHRQ22M29T9
12~22
KHRQ22M64T
24~42
KHRQ22M75T
▪ For refnet joints other than the first branch (example refnet joint b),
select the proper branch kit model based on the total capacity
index of all indoor units connected after the refrigerant branch.
Indoor unit capacity index
2 pipes
<200
KHRQ22M20T
200≤x<290
KHRQ22M29T9
290≤x<640
KHRQ22M64T
≥640
KHRQ22M75T
▪ Concerning refnet headers, choose from the following table in
accordance with the total capacity of all the indoor units connected
below the refnet header.
Indoor unit capacity index
2 pipes
<200
KHRQ22M29H
200≤x<290
290≤x<640
KHRQ22M64H
(a)
≥640
KHRQ22M75H
(a)
If the pipe size above the refnet header is Ø34.9 or more,
KHRQ22M75H is required.
Summary of Contents for VRV IV RXMLQ8T7Y1B Series
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