14 Piping installation
Installation and operation manual
19
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P546222-1B – 2020.10
Outdoor unit
capacity type (HP)
Piping outer diameter size (mm)
Liquid pipe
Suction gas
pipe
High
pressure/low
pressure gas
pipe
10
9.5
22.2
19.1
12
12.7
28.6
19.1
14~16
12.7
28.6
22.2
18
15.9
28.6
22.2
20~22
15.9
28.6
28.6
24
15.9
34.9
28.6
26~34
19.1
34.9
28.6
36
19.1
41.3
28.6
38~54
19.1
41.3
34.9
D: Piping between refrigerant branch kits or
refrigerant branch kit and BS unit
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
index
Piping outer diameter size (mm)
Liquid pipe
Suction gas
pipe
High
pressure/low
pressure gas
pipe
<150
9.5
15.9
12.7
150≤x<200
19.1
15.9
200≤x<290
22.2
19.1
290≤x<420
12.7
28.6
420≤x<640
15.9
28.6
640≤x<920
19.1
34.9
≥920
41.3
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 or BS unit
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
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
▪ If a size-up of the piping is required, refer to the table below.
e
d
b
c
a
a
Outdoor unit
b
Main pipes (increase size)
c
First refrigerant branch kit
d
Piping between refrigerant branch kit and indoor unit
e
Indoor unit
Size up
HP class
Liquid piping outer diameter size (mm)
5~8
9.5
→
12.7
10
12+14
12.7
→
15.9
16
18~22
15.9
→
19.1
24
26~34
19.1
→
22.2
36~54
▪ 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
"To determine the additional refrigerant
25].
14.1.3
To select refrigerant branch kits
Refrigerant refnets
▪ 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)
3 pipes
8+10
KHRQ23M29T9
12~22
KHRQ23M64T
24~54
KHRQ23M75T
▪ 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
3 pipes
<200
KHRQ23M20T
200≤x<290
KHRQ23M29T9
290≤x<640
KHRQ23M64T
≥640
KHRQ23M75T
▪ 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
3 pipes
<200
KHRQ23M29H
200≤x<290
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