6 Installation
Installer and user reference guide
24
RXYTQ8~16T7YF
VRV IV system air conditioner
4P388989-1B – 2016.02
NOTICE
In case of maintenance and the system (outdoor unit+field
indoor units) does not contain any refrigerant any
more (e.g., after refrigerant reclaim operation), the unit has
to be charged with its original amount of refrigerant (refer
to the nameplate on the unit) by pre-charging before the
automatic charging function can be started.
6.7.2
About charging refrigerant
Once vacuum drying is finished, additional refrigerant charging can
start.
To speed up the refrigerant charging process, it is in case of larger
systems recommended to first pre-charge a portion of refrigerant
through the liquid line before proceeding with the manual charging.
This step is included in below procedure (see
"6.7.5 To charge
refrigerant" on page 26
). It can be skipped, but charging will take
longer then.
A flow chart is available which gives an overview of the possibilities
and actions to be taken (see
"6.7.4 To charge refrigerant: Flow
chart" on page 24
).
6.7.3
To determine the additional refrigerant
amount
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.
Additional refrigerant to be charged=R (kg). R should be rounded off
in units of 0.1 kg.
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
X
1...6
=Total length (m) of liquid piping size at
Øa
Piping length Total indoor unit
capacity CR
(a)
A parameter (kg)
8 HP
10+12 HP 14+16 HP
≤30 m
50%≤CR≤105%
0
1
105%<CR≤130%
0.5
1.5
Piping length Total indoor unit
capacity CR
(a)
A parameter (kg)
8 HP
10+12 HP 14+16 HP
>30 m
50%≤CR≤70%
0
1
70%<CR≤85%
0.3
0.5
1.5
85%<CR≤105%
0.7
1
2
105%<CR≤130%
1.2
1.5
(a)
CR=Connection ratio.
INFORMATION
▪ When using multi combinations, add the sum of
individual HP modules.
▪ Piping length is considered the distance from the
outdoor unit to the farthest indoor unit.
When using metric piping, please take into account following table
concerning the weight factor to be allocated. It should be substituted
in the formula for R.
Inch piping
Metric piping
Size (Ø) (mm)
Weight factor
Size (Ø) (mm)
Weight factor
6.4
0.022
6
0.018
9.5
0.059
10
0.065
12.7
0.12
12
0.097
15.9
0.18
15
0.16
—
—
16
0.18
19.1
0.26
18
0.24
22.2
0.37
22
0.35
When selecting indoor unit, following table with connection ratio
limitation has to be respected. More detailed information can be
found in technical engineering data.
Used indoor units
Total capacity
CR
(a)
Allowable capacity
connection ratio
VRV DX
VRV DX
50~130%
50~130%
(a)
CR=Connection ratio.
INFORMATION
For final charge adjustment in the test laboratory, please
contact your local dealer.
6.7.4
To charge refrigerant: Flow chart
For more information, see
"6.7.5 To charge refrigerant" on page 26
.
Summary of Contents for RXYTQ8T7YF
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