Daikin VRV IV RYYQ10T7Y1B Series - 5.6.2 About charging refrigerant; 5.6.3 To determine the additional refrigerant amount

5 Installation
Installation and operation manual
17
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1C – 2016.07
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 procedures, check if the
7‑segment display indication of the outdoor unit A1P PCB
is as normal (see "6.1.4 To access mode 1 or 2" on
page 26). If a malfunction code is present, see
"8.1Solving problems based on error codes"on page31.
NOTICE
Make sure all connected indoor units are recognised (see
[1‑10], [1‑38] and [1‑39] in "6.1.7 Mode 1: Monitoring
settings"on page27).
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.
5.6.2 About charging refrigerant
Once vacuum drying is finished, additional refrigerant charging can
start.
There are two methods to charge additional refrigerant.
Method See
Automatic charge "5.6.6Step 6a: To automatically charge
refrigerant"on page21
Manual charge "5.6.7Step 6b: To manually charge
refrigerant"on page22
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
"5.6.5 To charge refrigerant" on page 20). 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 "5.6.4 To charge refrigerant: Flow
chart"on page18).
5.6.3 To determine the additional refrigerant
amount
INFORMATION
When using FXTQ indoor units, different requirements
apply. See "4.2.4 Requirements in case of FXTQ indoor
units"on page9.
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+B
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 10~16 HP 18~20 HP
≤30m 50%≤CR≤105% 0 0.5
105%<CR≤130% 0.5 1
>30m 50%≤CR≤70% 0 0.5
70%<CR≤85% 0.3 0.5 1.0
85%<CR≤105% 0.7 1 1.5
105%<CR≤130% 1.2 1.5 2.0
(a) CR=Connection ratio.
INFORMATION
▪ When using multi models, add the sum of individual HP
modules.
▪ Piping length is considered the distance from the
outdoor unit to the farthest indoor unit.
Model B parameter (kg)
(a)
RYYQ8+RYYQ10+RYYQ12 0.9
RYYQ14+RYYQ16 1.1
RYYQ18+RYYQ20 1.3
(a) B parameter is ONLY required for RYYQ8~20 models,
NOT for RXYQ8~54 and RYYQ22~54.
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
INFORMATION
For final charge adjustment in the test laboratory, please
contact your local dealer.