145
Installation
8.2.8.6.1
MINIMUM FLOOR AREA REQUIREMENTS
area (A
min
) required for the installation of an indoor unit
from a refrigerant system containing a certain refrigerant
charge (m
c
) of R32 (A2L refrigerant), and supposing a
total room height not lower than 2.2 m. (According to
IEC 60335-2-40:2018 and EN 378-1:2016).
For m
c
<1.84 kg, IEC 60335-2-40:2018 and EN
restriction. In that case check local regulations to ensure
that no hard restrictions may apply.
0
20
40
60
80
100
120
1.5 2 32.5
3.5
m
c
(kg)
A
min
(m
2
)
Floor mounted
Installation restrictions for indoor units using R32 refrigerant
Wall mounted Ceiling mounted
A
min
= (m
c
/(2.5*LFL^
(5/4)
* h
0
)
^2
(EQU.1)
A
min
: Minimum installation area of an Indoor unit for a given
refrigerant charge m
c
(kg) and considering the installation
height h
0
(m
2
)
.
h
0
: Installation height of the bottom side of the indoor unit +
distance from the indoor unit bottom side to the lowest part for
which a refrigerant leak may release to the indoor area.
m
c
: total system refrigerant charge that could be released to
the indoor area in case of undetected refrigerant leak.
LFL: Lower Flammability Limit for R32, 0.307 kg/m
3
as
established by EN 378-1:2016 and ISO 817.
m
c
(kg)
A
min
(m
2
) A
min
(m
2
) A
min
(m
2
)
Floor mounted Wall mounted Ceiling mounted
1.84 28.81 3.20 2.14
1.9 30.72 3.41 2.29
2.0 34.04 3.78 2.53
2.1 37.53 4.17 2.79
2.2 41.19 4.58 3.06
2.3 45.02 5.00 3.35
2.4 49.02 5.45 3.65
2.5 53.19 5.91 3.96
2.6 57.53 6.39 4.28
2.7 62.04 6.89 4.61
2.8 66.72 7.41 4.96
2.9 71.58 7.95 5.32
3.0 76.6 8.51 5.70
3.1 81.79 9.09 6.08
3.2 87.15 9.68 6.48
3.3 92.68 10.30 6.89
3.4 98.39 10.93 7.32
3.5 104.26 11.58 7.75
The A
min
in the table above is calculated according to the
formula (EQU.1) under the following conditions:
- Floor mounted: h0 = 0.6 m
- Wall mounted: h0 = 1.8 m
- Ceiling mounted: h0 = 2.2 m
For safety, the A
min
must be calculated according to the actual
installation by professionals.
and poisonous gases into the refrigerant because an explosion
can occur. It is recommended that oxygen free nitrogen be
charged for these types of tests cycle when performing a
leakage test or an air-tightness test. These types of gases are
extremely dangerous.
Check for refrigerant leakage in detail. If a large refrigerant
room.
Only use R32 as refrigerant. Other substances may cause
explosions and accidents.
R32 is uorinated greenhouse gases. Its global warming
potential (GWP) value is 675.
Do NOT vent these gases into the atmosphere.
Tonnes of CO2 equivalent of uorinated greenhouse gases
contained is calculated by GWP value of the refrigerant ×
Total refrigerant charge [kg] / 1000 in the label.
2
greenhouse gases contained on the installation.
8.3.8.7
CAUTION OF THE PRESSURE BY CHECK JOINT
When the pressure is measured, use the check joint of the
gas stop valve.
At that time, connect the pressure gauge according to
the following table because of high pressure side and low
pressure side changes by operation mode.
Check joint of the gas stop valve:
Cooling
operation
Heating
operation
Low pressure High pressure
Be careful that refrigerant and oil do not splash to the electrical parts
at removing the charge hoses.
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