Daikin RWEYQ8T9Y1B Installer And User Manual page 14

5 Preparation
In case of heat recovery mode
A
a x
D E
3 4
b
E
1 2
1,2 VRV DX indoor unit
3 BS unit
4 Cooling only VRV indoor unit
A~E Piping
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.
In case of heat pump mode
Outdoor unit Piping outer diameter size (mm)
capacity type (HP)
Gas pipe
8
10
12~16
18~22
24
26~34
36~42
In case of heat recovery mode
Outdoor unit Piping outer diameter size (mm)
capacity type (HP)
Liquid pipe
5~8 9.5
10
12 12.7
14~16
18 15.9
20~22
24
26~34 19.1
36
38~42
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.
Installer and user reference guide
14
B B B
C y
Liquid pipe
19.1 9.5
22.2
28.6 12.7
15.9
34.9
19.1
41.3
Suction gas High
pipe pressure/low
pressure gas
pipe
19.1 15.9
22.2 19.1
28.6
22.2
28.6
34.9
41.3
34.9
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
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
4P452191-1 – 2017.04