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▪ 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
▪ 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.
14.4
Charging refrigerant
14.4.1
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 powered on, the compressor will not
operate before the communication is established in a
correct way between outdoor unit(s) and indoor units.
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P546223-1C – 2021.11
Minimum thickness
15 mm
20 mm
14.4.2
Once vacuum drying is finished, additional refrigerant charging can
start.
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 manual charging.
This step is included in below procedure (see
refrigerant" [ 4 24]). 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
chart" [ 4 23]).
14.4.3
Formula:
R=[(X
(X
×Ø12.7)×0.12+(X
4
Parameter A:
Piping length
14 Piping installation
NOTICE
Before
starting
charging
7‑segment display indication of the outdoor unit A1P PCB
is as normal (see
"16.1.4 To access mode 1 or
If a malfunction code is present, see
codes" [ 4 33].
problems based on error
NOTICE
Make sure all connected indoor units are recognised (see
[1‑10] in
"16.1.7 Mode 1: Monitoring
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
"14.4.4 To charge refrigerant: Flow
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
outdoor
independent systems, each containing less than 95 kg
refrigerant charge. For factory charge, refer to the unit
name plate.
×Ø22.2)×0.37+(X
×Ø19.1)×0.26+(X
1
2
×Ø9.5)×0.059+(X
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
Parameter A (see below)
(a)
(b)
CR
≤30 m
50%≤CR≤105%
105%<CR≤130%
procedures,
check
if
the
2" [ 4 29]).
"19.1 Solving
settings" [ 4 30]).
"14.4.5 To charge
system
into
smaller
×Ø15.9)×0.18+
3
×Ø6.4)×0.022]+A
6
(c)
A
8 HP
10+12 HP 14+16 HP
0 kg
1 kg
0.5 kg
1.5 kg
Installation and operation manual
21
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