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Piping installation
Installer and user reference guide
67
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
In case of heat pump system
Indoor unit capacity index
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
<150
15.9
9.5
150≤x<200
19.1
200≤x<290
22.2
290≤x<420
28.6
12.7
420≤x<640
15.9
640≤x<920
34.9
19.1
≥920
41.3
In case of heat recovery system
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
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
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
c
Increase
d
First refrigerant branch kit
e
Indoor unit
