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4. REFRIGERANT AND WATER PIPING
4.1 General notes appliance with R32 refrigerant
This symbol displayed on the unit indicates that
this appliance is filled with R32, an odourless
flammable refrigerant gas with low burning
velocity (A2L class pursuant to ISO 817). If the
A2L
refrigerant is leaked, there is a possibility of
ignition if it enters in contact with an external ignition
source.
Do not use means to accelerate the defrosting process
or to clean, other than those recommended by the
manufacturer.
The appliance shall be stored in a room without continu-
ously operating ignition sources (for example: open flames,
an operating gas appliance or an operating electric heater).
Do not pierce or burn.
Be aware that refrigerants may not contain an odour.
RISK OF EXPLOSION
The compressor must be stopped before removing the
refrigerant pipes.
All service valves must be fully closed after pumping
down operation.
This symbol displayed on the unit indicates that
this appliance shall be handled by authorized
service personnel only, referring to the
Installation Manual.
This symbol displayed on the unit indicates that
there is relevant information included in the
Operation Manual and/or Installation Manual.
For more information, see the Installation and
Operation Manual.
Make sure that unit installation and refrigerant piping
installation comply with applicable legislation in each
country. Also, in Europe, EN378 must be complied, as it is
the applicable standard.
4.2 R410A Refrigerant circuit
‹ Precautions in the event of gas refrigerant leaks
The installers and those responsible for drafting the
specifications are obliged to comply with local safety
codes and regulations in the case of refrigerant leakage.
!
CAUTION
• Check for refrigerant leakage in detail. If a large refrigerant
leakage occurred, it would cause difficulty with breathing or
harmful gases would occur if a fire were in the room.
• If the flare nut is tightened too hard, it may crack over time and
cause refrigerant leakage.
‹ Maximum permitted concentration of HFCs
The refrigerant R410A (charged in the outdoor unit) is
an incombustible and non-toxic gas. However, if leakage
occurs and gas fills a room, it may cause suffocation.
The maximum permissible concentration of HFC gas
according to EN378-1 is:
Refrigerant
R410A
EN
PMML0666 rev.0 - 09/2024 - 1000017439
Maximum permissible
concentration (kg/m
)
3
0.44
The minimum volume of a closed room where the system
is installed to avoid suffocation in case of leakage is:
System combination
8 HP
10 HP
The formula used for the calculation of the maximum
allowed refrigerant concentration in case of refrigerant
leakage is the following:
R
R: Total quantity of refrigerant charged (kg)
— = C
V: Room volume (m³)
C: Refrigerant concentration
V
If the room volume is below the minimum value, some
effective measure must be taken account after installing
to prevent suffocation in case of leakage.
4.3 Refrigerant piping and refrigerant charge
4.3.1 Refrigerant piping length between indoor
unit and outdoor unit (R32 units)
The unit installation and refrigerant piping should comply
with the relevant local and national regulations for the
designed refrigerant.
Due to R32 refrigerant and depending on final refrigerant
charge amount, a minimum floor area for installation
must be considered.
• If total refrigerant charge amount <1.84kg, there are
no minimum floor area requirements.
• If total refrigerant charge amount ≥1.84kg, there are
minimum floor area requirements to be checked.
5. ELECTRICAL AND CONTROL SETTINGS
5.1 General check
• Make sure that the following conditions related to
power supply installation are satisfied:
9 The power capacity of the electrical installation
is large enough to support the power demand of
the YUTAKI system (outdoor unit + indoor unit +
DHW tank (if apply)).
9 The power supply voltage is within ±10% of the
rated voltage.
9 The impedance of the power supply line is low
enough to avoid any voltage drop of more than
15% of the rated voltage.
• Following the Council Directive 2014/30/EU, relating
to electromagnetic compatibility, the table below
indicates the Maximum permitted system impedance
at the interface point of the user's supply, in
Z
max
accordance with EN 61000-3-11.
Minimum volume (m
)
3
11.4
12.1
4
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