To Select Refrigerant Branch Kits - Daikin RWEYQ8T9Y1B Installation And Operation Manual

In case of heat pump mode
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
In case of heat recovery mode
Indoor unit capacity Piping outer diameter size (mm)
index
Liquid pipe
<150 9.5
150≤x<200
200≤x<290
290≤x<420 12.7
420≤x<640 15.9
640≤x<920 19.1
≥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 or BS unit
and indoor unit
For heat pump mode and heat recovery mode
Pipe size for direct connection to indoor unit must be the same as
the connection size of the indoor unit.
Indoor unit capacity Piping outer diameter size (mm)
index
Gas pipe
15~50
63~140
200
250
▪ If a size-up of the piping is required, refer to the table below.
a
c
b
d
a Outdoor unit
b Main pipes
c Increase
d First refrigerant branch kit
e Indoor unit
Size up
HP class Liquid piping outer diameter size (mm)
5~8
10
12+14
16
RWEYQ8~14T9V1B+RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1A – 2017.04
Liquid pipe
15.9 9.5
19.1
22.2
28.6 12.7
15.9
34.9 19.1
41.3
Suction gas High
pipe pressure/low
pressure gas
pipe
15.9 12.7
19.1 15.9
22.2 19.1
28.6
28.6
34.9
41.3
Liquid pipe
12.7 6.4
15.9 9.5
19.1
22.2
e
9.5 → 12.7
12.7 → 15.9
Size up
HP class Liquid piping outer diameter size (mm)
18~22
24
26~34
36~42
F: Piping between refrigerant branch kit and BP
unit
Heat pump mode in case of single outdoor 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]
G: Piping between BP unit and RA DX indoor unit
Heat pump mode in case of single outdoor unit
Only in case RA DX indoor units are connected.
Indoor unit capacity Piping outer diameter size (mm)
index
Gas pipe
20, 25, 30
50
60
71
4.2.3

To select refrigerant branch kits

Refrigerant refnets
For piping example, refer to "4.2.2 To select the piping size" on
page 8.
▪ 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 2 pipes
capacity type (HP)
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 2 pipes
index
<200 KHRQ22M20T
200≤x<290 KHRQ22M29T9
290≤x<640 KHRQ22M64T
≥640 KHRQ22M75T
4 Preparation
15.9 → 19.1
19.1 → 22.2
Liquid pipe
12.7 6.4
15.9 9.5
19.1
Liquid pipe
9.5 6.4
12.7
9.5
15.9
3 pipes
KHRQ23M29T9
KHRQ23M64T
KHRQ23M75T
3 pipes
KHRQ23M20T
KHRQ23M29T9
KHRQ23M64T
KHRQ23M75T
Installation and operation manual
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