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Piping installation
Installer and user reference guide
97
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
R=[(X
1
×
Ø22.2
)×0.37+(X
2
×
Ø19.1
)×0.26+(X
3
×
Ø15.9
)×0.18+
(X
4
×
Ø12.7
)×0.12+(X
5
×
Ø9.5
)×0.059+(X
6
×
Ø6.4
)×0.022]+A
R
Additional refrigerant to be charged [in kg and rounded off to 1 decimal place]
X
1...6
Total length [m] of liquid piping size at
Øa
A
Parameter A
Parameter A.
If the total indoor unit capacity connection ratio (CR)>100%, charge
an additional 0.5 kg of refrigerant per outdoor unit.
In case of heat recovery system
Formula:
R=[(X
1
×
Ø22.2
)×0.37+(X
2
×
Ø19.1
)×0.26+(X
3
×
Ø15.9
)×0.18+
(X
4
×
Ø12.7
)×0.12+(X
5
×
Ø9.5
)×0.059+(X
6
×
Ø6.4
)×0.022]×1.04+A+C
R
Additional refrigerant to be charged [in kg and rounded off to 1 decimal place]
X
1...6
Total length [m] of liquid piping size at
Øa
A
Parameter A
C
Parameter C
Parameter A.
If the total indoor unit capacity connection ratio (CR)>100%, charge
an additional 0.5 kg of refrigerant per outdoor unit.
Parameter C.
When using more than one multi BS unit, add the sum of the
individual BS unit charge factors.
Model
C
BS1Q10
0.05 kg
BS1Q16
0.1 kg
BS1Q25
0.2 kg
BS4Q
0.3 kg
BS6Q
0.4 kg
BS8Q
0.5 kg
BS10Q
0.7 kg
BS12Q
0.8 kg
BS16Q
1.1 kg
Metric piping.
When using metric piping, replace the weight factors in the formula
by the ones from the following table:
Inch piping
Metric piping
Piping
Weight factor
Piping
Weight factor
Ø6.4 mm
0.022
Ø6 mm
0.018
Ø9.5 mm
0.059
Ø10 mm
0.065
Ø12.7 mm
0.12
Ø12 mm
0.097
Ø15.9 mm
0.18
Ø15 mm
0.16
Ø16 mm
0.18
Ø19.1 mm
0.26
Ø18 mm
0.24
Ø22.2 mm
0.37
Ø22 mm
0.35
Connection ratio requirements.
When selecting indoor units, the connection ratio
must comply with the following requirements. For more information, see the
technical engineering data.
