16 Charging refrigerant
Installation and operation manual
35
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P684060-1 – 2022.02
5
Make sure the field piping does not touch any compressor
components.
6
Seal the insulation ends (sealant etc.) (b, see above).
7
Wrap the field piping with vinyl tape (d, see above) to protect it
against sharp edges
8
If the outdoor unit is installed above the indoor unit, cover the
stop valves with sealing material to prevent condensed water
on the stop valves from moving to the indoor unit.
NOTICE
Any exposed piping might cause condensation.
9
Reattach the service cover and the piping intake plate.
10
Seal all gaps to prevent snow and small animals from entering
the system.
WARNING
Provide adequate measures to prevent that the unit can be
used as a shelter by small animals. Small animals that
make contact with electrical parts can cause malfunctions,
smoke or fire.
15.3.7
To check for leaks after charging
refrigerant
After charging refrigerant in the system an additional leak test must
be performed. Refer to
"16.9 To check for refrigerant leaks after
39].
16
Charging refrigerant
16.1
Precautions when charging
refrigerant
WARNING
▪ Only use R32 as refrigerant. Other substances may
cause explosions and accidents.
▪ R32 contains fluorinated greenhouse gases. Its global
warming potential (GWP) value is 675. 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.
NOTICE
Make sure all connected indoor units are recognised (see
[1‑10] and [1‑39] in
NOTICE
Before starting charging procedures, check if the
7‑segment display indication of the outdoor unit A1P PCB
is as normal (see
"18.1.4 To access mode 1 or 2"
43]).
If a malfunction code is present, see
problems based on error codes"
48].
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+BS
unit+field 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
39].
▪ 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.
16.2
About charging refrigerant
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 actual charging.
This step is included in below procedure (see
37]). 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
"16.4 To charge refrigerant: Flow
37]).
