Charging Refrigerant; Precautions When Charging Refrigerant; About Charging Refrigerant; To Determine The Additional Refrigerant Amount - Daikin VRV IV+ RYYQ12U7Y1B Series Installer And User Manual

6.7

Charging refrigerant

6.7.1

Precautions when charging refrigerant

WARNING
▪ Only use R410A as refrigerant. Other substances may
cause explosions and accidents.
▪ R410A contains fluorinated greenhouse gases. Its
global warming potential (GWP) value is 2087.5. Do
NOT vent these gases into the atmosphere.
▪ When charging refrigerant, always use protective
gloves and safety glasses.
NOTICE
If the power of some units is turned off, the charging
procedure cannot be finished properly.
NOTICE
In case of a multiple outdoor system, turn on the power of
all outdoor units.
NOTICE
Be sure to turn on the power 6 hours before operation in
order to have power running to the crankcase heater and
to protect the compressor.
NOTICE
If operation is performed within 12 minutes after the indoor
and outdoor units are turned on, the compressor will not
operate before the communication is established in a
correct way between outdoor unit(s) and indoor units.
NOTICE
Before starting charging
7‑segment display indication of the outdoor unit A1P PCB
is as normal (see "7.2.4 To access mode 1 or 2" on
page 38). If a malfunction code is present, see
"10.2 Solving problems based on error codes" on
page 50.
NOTICE
Make sure all connected indoor units are recognised (see
[1‑10], [1‑38] and [1‑39] in
settings" on page 39).
NOTICE
Close the front panel before any refrigerant charge
operation is executed. Without the front panel attached the
unit cannot judge correctly whether it is operating properly
or not.
NOTICE
In case of maintenance and the system (outdoor unit+field
piping+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.
There are two methods to charge additional refrigerant.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
procedures, check if the
"7.2.7 Mode 1: Monitoring
Method
Automatic charge "6.7.6 Step 6a: To automatically charge
refrigerant" on page 31
Manual charge "6.7.7 Step 6b: To manually charge
refrigerant" on page 32
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
"6.7.5 To charge refrigerant" on page
charging will take longer then.
A flow chart is available which gives an overview of the possibilities
and actions to be taken (see
chart" on page 29).
6.7.3 To determine the additional refrigerant
amount
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
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 ×Ø19.1)×0.26+(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~C (see tables below)
▪ Parameter A:
Parameter A
(b)
Piping length CR
≤30 m 50%≤CR≤105%
105%<CR≤130%
>30 m 50%≤CR≤70%
70%<CR≤85%
85%<CR≤105%
105%<CR≤130%
(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 B:
Parameter B
RYYQ8~12 RYYQ14
1.4 kg 1.7 kg
6 Installation
See
30). It can be skipped, but
"6.7.4 To charge refrigerant: Flow
outdoor system into smaller
×Ø15.9)×0.18+
3
×Ø6.4)×0.022]+A+B+C
6
(a)
A
8 HP 10~14 HP 16~20 HP
0 kg 0.5 kg
0.5 kg 1.0 kg
0 kg 0.5 kg
0.3 kg 0.5 kg 1.0 kg
0.7 kg 1.0 kg 1.5 kg
1.2 kg 1.5 kg 2.0 kg
(a)
RYYQ16 RYYQ18 +
RYYQ20
1.2 kg 2.0 kg
Installer and user reference guide
27