5 Preparation
Installer and user reference guide
14
RWEYQ8~1 RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1 – 2017.04
In case of heat recovery mode
A
B
B
B
C
D
E
E
x
y
b
a
4
3
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
capacity type (HP)
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
8
19.1
9.5
10
22.2
12~16
28.6
12.7
18~22
15.9
24
34.9
26~34
19.1
36~42
41.3
In case of heat recovery mode
Outdoor unit
capacity type (HP)
Piping outer diameter size (mm)
Liquid pipe
Suction gas
pipe
High
pressure/low
pressure gas
pipe
5~8
9.5
19.1
15.9
10
22.2
19.1
12
12.7
28.6
14~16
22.2
18
15.9
20~22
28.6
24
34.9
26~34
19.1
36
41.3
38~42
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.
In case of heat pump mode
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 mode
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 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
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.
a
e
b
c
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
9.5 → 12.7
10
12+14
12.7 → 15.9
16