About Charging Refrigerant; To Determine The Additional Refrigerant Amount - Daikin VRV IV+ Installer And User Reference Manual

6 | Installation

6.7.2 About charging refrigerant

6.7.3 To determine the additional refrigerant amount

Installer and user reference guide
64
Once vacuum drying is finished, additional refrigerant charging can start.
There are two methods to charge additional refrigerant.
Method
Automatic charge
Manual charge
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 "6.7.4 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:
(b)
Piping length
≤30 m
"6.7.6 Step 6a: To automatically charge
refrigerant" [
"6.7.7 Step 6b: To manually charge
refrigerant" [
"6.7.5 To charge refrigerant"
×Ø19.1)×0.26+(X ×Ø15.9)×0.18+
2 3
×Ø6.4)×0.022]+A+B+C
6
Parameter A
CR
50%≤CR≤105%
105%<CR≤130%
See
4
72]
4
73]
4
[ 69]). It can be
4
chart" [ 67]).
(a)
A
8 HP 10~14 HP
0 kg
0.5 kg
RYYQ+RYMQ+RXYQ8~20U7Y1B
4P546228-1A – 2019.10
16~20 HP
0.5 kg
1.0 kg
VRV IV+ heat pump