About Charging Refrigerant; To Determine The Additional Refrigerant Amount - Daikin VRV 5 RXYA8A7Y1B Installer And User Manual

19.2 About charging refrigerant

19.3 To determine the additional refrigerant amount

RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
NOTICE
In case of maintenance and the system (outdoor unit + SV 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
▪
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 of charging but prior to
commissioning. A follow up leak test shall be carried out prior to leaving the site.
Once vacuum drying and leak test are 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 actual charging. This step is included in below
procedure (see "19.5 To charge
charging will take longer then.
A flow chart is available which gives an overview of the possibilities and actions to
be taken (see "19.4 To charge refrigerant: Flow
WARNING
The maximum indoor capacity index which can be connected to a SV unit port is
determined based on the smallest room served by that port.
In case the system serves the lowest underground floor of a building, there is an
extra limit to the maximum allowable total refrigerant amount. This maximum
refrigerant amount is determined based on the area of the smallest room on the
lowest underground floor.
See "16 Special requirements for R32
allowable total refrigerant amount.
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19 Charging refrigerant
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Installer and user reference guide
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