Daikin VRV IV W+ Series Installer And User Reference Manual page 67

E: Piping between refrigerant branch kit or BS unit and indoor unit
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
In case of heat pump system
Indoor unit capacity index
<150
150≤x<200
200≤x<290
290≤x<420
420≤x<640
640≤x<920
≥920
In case of heat recovery system
Indoor unit capacity index
<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]
For heat pump and heat recovery system
Pipe size for direct connection to indoor unit must be the same as the connection
size of the indoor unit.
15~50 12.7
63~140 15.9
200 19.1
250 22.2
▪ If a size-up of the piping is required, refer to the table below.
a
b
a Outdoor unit
b Main pipes
c Increase
d First refrigerant branch kit
e Indoor unit
Piping outer diameter size (mm)
Gas pipe
15.9
19.1
22.2
28.6
34.9
41.3
Piping outer diameter size (mm)
Liquid pipe Suction gas pipe High pressure/
9.5
12.7
15.9
19.1
e
d
c
18 Piping installation
|
Liquid pipe
9.5
12.7
15.9
19.1
low pressure gas
pipe
15.9 12.7
19.1 15.9
22.2 19.1
28.6
28.6
34.9
41.3
6.4
9.5
Installer and user reference guide
67