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

18.4.3 To determine the additional refrigerant amount

RXYQQ8~20U7Y1B
VRV IV Q+ series heat pump
4P546229-1A – 2020.10
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 "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 2
(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 and C (see tables below)
▪ Parameter A:
(b)
Piping length
≤30 m
>30 m
(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
▪ Parameter C:
"To charge
chart" [
×Ø19.1)×0.26+(X ×Ø15.9)×0.18+
3
×Ø6.4)×0.022]+A+C
6
Parameter A
CR
50%≤CR≤105%
105%<CR≤130%
50%≤CR≤70%
70%<CR≤85% 0.3 kg
85%<CR≤105% 0.7 kg
105%<CR≤130% 1.2 kg
18 Piping installation
|
4
refrigerant" [ 99]). It can be
4
98]).
(a)
A
8 HP 10~14 HP
0 kg
0.5 kg
0 kg
0.5 kg
1.0 kg
1.5 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
95