To Determine The Additional Refrigerant Amount - Daikin VRV IV+ RYYQ8U7Y1B Series Installer And User Manual

17.4.3 To determine the additional refrigerant amount

RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
INFORMATION
Adding refrigerant using the automatic refrigerant charging function is not possible
when Hydrobox units or RA DX indoor units are connected to the system.
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 actual automatic or manual charging. This step is
included in below procedure (see
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 "17.4.4 To charge refrigerant: Flow
INFORMATION
For final charge adjustment in the test laboratory, please contact your local dealer.
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 ×Ø22.2)×0.37+(X
1
(X ×Ø12.7)×0.12+(X ×Ø9.5)×0.059+(X
4 5
R Additional refrigerant to be charged [in kg and rounded off to 1 decimal place]
X Total length [m] of liquid piping size at Øa
1...6
A~C Parameters A~C (see tables below)
▪ Parameter A:
(a)
Piping length
≤30 m
>30 m
(a)
Piping length is considered the distance from the outdoor unit to the farthest indoor unit.
(b)
Total CR = Total indoor unit capacity connection ratio
▪ Parameter B:
Model
RYYQ8~12
RYYQ14
RYYQ16
RYYQ18 + RYYQ20
"17.4.5 To charge
×Ø19.1)×0.26+(X ×Ø15.9)×0.18+
2 3
×Ø6.4)×0.022]+A+B+C
6
(b)
CR
50%≤CR≤105%
105%<CR≤130%
50%≤CR≤70%
70%<CR≤85%
85%<CR≤105%
105%<CR≤130%
(a)
17 Piping installation
|
4
refrigerant" [ 102]). It can be
4
chart" [ 100]).
Parameter A
8 HP 10~14 HP
0 kg
0.5 kg
0 kg
0.3 kg 0.5 kg
0.7 kg 1.0 kg
1.2 kg 1.5 kg
Parameter B
1.4 kg
1.7 kg
1.2 kg
2.0 kg
Installer and user reference guide
16~20 HP
0.5 kg
1.0 kg
0.5 kg
1.0 kg
1.5 kg
2.0 kg
97