15
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Unit installation
Installer and user reference guide
49
FXSN50~112A2VEB
CO₂ Conveni-Pack: indoor unit
4P602817-1A – 2020.05
Example:
Total refrigerant change in the system is 45 kg and room volume is
300 m
3
. 45/300 = 0.15, which is >RCL(0.072) and <QLAV(0.18), therefore install at
least 2 appropriate measures in the room.
A (kg)
B (m³)
0
0
100 150
50
200 250
300
350
450
550
400
500
600 650 700 750 800 850 900 950 1000
5
10
15
20
25
30
35
40
45
50
55
60
65
70
d
b
a
RCL
QLAV
QLMV
c
15‒3 Example graph for calculation
A
Refrigerant charge limit
B
Room volume
a
Installation is not allowed
b
2 appropriate measures required
c
1 appropriate measures required
d
No measure required
INFORMATION
Even if there is no refrigerating system on the lowest floor, where the largest system
charge (kg) in the building divided by total volume of the lowest floor (m
3
) exceed the
value for QLMV, provide a mechanical ventilation in accordance with EN 378-3:2016.
Space volume calculation
Take into account following requirements for the space volume calculation:
▪
The space considered is any space that contains refrigerant-containing parts or
into which refrigerant can be released.
▪
Use the room volume of the smallest, enclosed, occupied space to determine the
refrigerant quantity limits.
▪
Multiple spaces that have appropriate openings (which cannot be closed)
between the individual spaces or are connected with a common ventilation
supply, return or exhaust system not containing the evaporator or the condenser
shall be treated as a single space.
▪
Where the evaporator or condenser is located in an air supply duct system
serving multiple spaces, the volume of the smallest single space shall be used.
▪
If the airflow to a space cannot be reduced to less than 10% of the maximum
airflow using an airflow reducer, then that space shall be included in the volume
of the smallest human occupied space.
▪
For refrigerants of safety class A1, the total volume of all the rooms cooled or
heated by air from one system is used as the volume for calculation, if the air
supply to each room cannot be restricted below 25% of its full supply.
▪
For refrigerants of safety class A1, the effect of the air changes may be
considered in calculating the volume if the space has a mechanical ventilation
system which will be operating during the occupation of the space.
▪
Where the evaporator or condenser is located in an air supply duct system and
the system serves a non-partitioned multi-storey building, the occupied volume
of the smallest occupied storey of the building shall be used.
