Daikin VRV 5-S Series Installation And Operation Manual page 29

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.
NOTICE
Before starting charging
7‑segment display indication of the outdoor unit A1P PCB
is as normal (see "17.1.4 To access mode 1 or 2"
If a malfunction code is present, see
problems based on error
NOTICE
Make sure all connected indoor units are recognised
(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.
NOTICE
▪ Ensure that contamination of different refrigerants does
not occur when using charging equipment.
▪ Charging hoses or lines shall be as short as possible to
minimise the amount of refrigerant contained in them.
▪ Cylinders shall be kept in an appropriate position
according to the instructions.
▪ Ensure that the refrigerating system is earthed prior to
charging the system with refrigerant. See
connect the electrical wiring to the outdoor
▪ Label the system when charging is complete.
▪ Extreme care shall be taken not to overfill the
refrigerating system.
NOTICE
Prior to charging the system, it shall be pressure tested
with the appropriate purging gas. The system shall be leak
tested on completion
commissioning. A follow up leak test shall be carried out
prior to leaving the site.
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600329-1A – 2020.01
procedures, check if the
[ 4 36]).
"19.1 Solving
codes" [ 4 39].
"15.3 To
unit" [ 4 31].
of charging but prior
14.2 To determine the additional
refrigerant amount
WARNING
The maximum allowable total refrigerant amount is
determined based on the smallest room being served by
the system.
See "2.1.2 System layout
the maximum allowable total refrigerant amount.
INFORMATION
For final charge adjustment in a test laboratory, contact
your dealer.
INFORMATION
Note down the amount of additional refrigerant that is
calculated here, for later use on the additional refrigerant
charge label. See
label" [ 4 30].
gases
Formula:
R=[(X ×Ø9.5)×0.053+(X
1
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...2
Metric piping. When using metric piping, replace the weight factors
in the formula by the ones from the following table:
Inch piping
Piping Weight factor
Ø6.4 mm
Ø9.5 mm
14.3 To charge refrigerant
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. It
can be skipped, but charging will take longer then.
Pre-charging refrigerant
Pre-charging can be done without compressor operation, by
connecting the refrigerant bottle to the service port of the liquid stop
valve.
1 Connect as shown. Make sure that all outdoor unit stop valves,
as well as valve A are closed.
p < p >
A
a
d
N2
R32
to
b c e
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R32 tank (siphon system)
e Vacuum pump
f Liquid line stop valve
g Gas line stop valve
A Valve A
B Valve B
C Valve C
2 Open valves C and B.
14 Charging refrigerant
requirements" [ 4 9] to determine
"14.5 To fix the fluorinated greenhouse
×Ø6.4)×0.020]
2
Metric piping
Piping Weight factor
0.020 Ø6 mm
0.053 Ø10 mm
B
g
f
C
Installation and operation manual
0.016
0.058
29