6 Installation
Installer and user reference guide
25
RXYTQ8~16U7YF
VRV IV+ heat pump for high ambient temperatures
4P561157-1 – 2018.09
NOTICE
The refrigerant charge of the system must be less than
100 kg. This means that in case the calculated total
refrigerant charge is equal to or more than 95 kg you must
divide your multiple outdoor system into smaller
independent systems, each containing less than 95 kg
refrigerant charge. For factory charge, refer to the unit
name plate.
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]+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
(a)
Piping length
(b)
CR
A
8 HP
10+12 HP 14+16 HP
≤30 m
50%≤CR≤105%
0 kg
1 kg
105%<CR≤130%
0.5 kg
1.5 kg
>30 m
50%≤CR≤70%
0 kg
1 kg
70%<CR≤85%
0.3 kg
0.5 kg
1.5 kg
85%<CR≤105%
0.7 kg
1 kg
2 kg
105%<CR≤130%
1.2 kg
1.5 kg
(a)
In case of a multi-outdoor-unit system, add the sum of the
individual outdoor unit charge factors.
(b)
Piping length is considered the distance from the outdoor
unit to the farthest indoor unit
CR
Total indoor unit capacity connection ratio
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.
Indoor units
CR
VRV DX
50~130%
CR
Total indoor unit capacity connection ratio
Содержание VRV IV+ RXYTQ8U7YF
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