Charging Refrigerant; Precautions When Charging Refrigerant; About Charging Refrigerant; To Determine The Additional Refrigerant Amount - Daikin RYYQ8T7Y1B Installer And User Reference Manual

6 Installation
▪ Make sure to insulate the connection piping and refrigerant branch
kits entirely.
▪ Be sure to insulate the liquid and gas piping (for all units).
▪ Use heat resistant polyethylene foam which can withstand a
temperature of 70°C for liquid piping and polyethylene foam which
can withstand a temperature of 120°C for gas piping.
▪ Reinforce the insulation on the refrigerant piping according to the
installation environment.
Ambient Humidity
temperature
≤30°C 75% to 80% RH
>30°C ≥80% RH
Condensation might form on the surface of the insulation.
▪ If there is a possibility that condensation on the stop valve might
drip down into the indoor unit through gaps in the insulation and
piping because the outdoor unit is located higher than the indoor
unit, this must be prevented by sealing up the connections. See
below figure.
b
a
a Insulation material
b Caulking etc.
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.
Installer and user reference guide
28
Minimum thickness
15 mm
20 mm
6.7.2
Once vacuum drying is finished, additional refrigerant charging can
start.
There are two methods to charge additional refrigerant.
Automatic charge
Manual charge
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
6.7.3
NOTICE
Before starting charging procedures,
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 40). If a malfunction code is present, see
"10.2 Solving problems based on error codes" on
page 52.
NOTICE
Make sure all connected indoor units are recognised (see
[1‑10], [1‑38] and [1‑39] in "7.2.7 Mode 1: Monitoring
settings" on page 41).
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.

About charging refrigerant

Method
"6.7.6 Step 6a: To automatically charge
refrigerant" on page 33
"6.7.7 Step 6b: To manually charge
refrigerant" on page 34
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.
"6.7.4 To charge refrigerant: Flow
page 30).
To determine the additional refrigerant
amount
INFORMATION
When using FXTQ indoor units, different requirements
apply. See "5.3.8 Requirements in case of FXTQ indoor
units" on page 18.
INFORMATION
For final charge adjustment in the test laboratory, please
contact your local dealer.
RYYQ+RYMQ+RXYQ8~20T7Y1B
check if the
See
32). It can be skipped, but
VRV IV system air conditioner
4P370475-1C – 2016.11