To Insulate The Refrigerant Piping; Charging Refrigerant; About Charging Refrigerant; Precautions When Charging Refrigerant - Daikin VRV IV-S Installer And User Manual

4 Depending on whether you want to immediately charge
refrigerant through the refrigerant charge port or first pre-charge
a portion of refrigerant through the liquid line, either open the
outdoor unit stop valves, or keep them closed. See
charge refrigerant" on page 24
INFORMATION
After opening the stop valve, it is possible that the pressure
in the refrigerant piping does NOT increase. This might be
caused by e.g. the closed state of the expansion valve in
the outdoor unit circuit, but does NOT present any problem
for correct operation of the unit.
6.6

To insulate the refrigerant piping

After finishing the leak test and vacuum drying, the piping must be
insulated. Take into account the following points:
▪ 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

About charging refrigerant

The outdoor unit is factory charged with refrigerant, but depending
on the field piping you have to charge additional refrigerant.
Before charging refrigerant
Make sure the outdoor unit's external refrigerant piping is checked
(leak test, vacuum drying).
Typical workflow
Charging additional refrigerant typically consists of the following
stages:
1 Determining how much you have to charge additionally.
2 Charging additional refrigerant (pre-charging and/or charging).
3 Filling in the fluorinated greenhouse gases label, and fixing it to
the inside of the outdoor unit.
RXYSQ8~12TMY1B
VRV IV-S system air conditioner
4P404225-1B – 2016.03
"6.7.4 To
for more information.
Minimum thickness
15 mm
20 mm
6.7.2

Precautions when charging refrigerant

INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
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
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:
▪ In case of RXYSQ8: Check if the 7‑LEDs display is as
normal (see "7.2.4 To access mode 1 or 2" on
page 30), and there is no malfunction code on the
user interface of the indoor unit. If a malfunction code is
present, see "11.3 Solving problems based on error
codes" on page 42.
▪ In case of RXYSQ10+12: Check if the 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 30). If a malfunction code is present, see
"11.3 Solving problems based on error codes" on
page 42.
NOTICE
Make sure all connected indoor units are recognised (in
case of RXYSQ8: setting [1‑5]; in case of RXYSQ10+12:
setting [1‑10]).
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) and the determined additional
refrigerant amount.
6 Installation
Installer and user reference guide
23