Daikin LREN8A7Y1B - Page 63

14 | Unit installation
Installer and user reference guide
63
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
To determine the minimum number of appropriate measures
For occupancies other than on the lowest underground floor of the building
If the total refrigerant charge (kg)
divided by the room volume
(a)
(m
3
) is…
…the number of appropriate measures
must be at least…
<QLMV 0
>QLMV and <QLAV 1
>QLAV 2
(a)
For occupied spaces with a floor area exceeding 250m
2
, use 250m
2
as the floor area for
determination of the room volume (Example: even if the room area is 300m
2
and the
room height is 2.5m, calculate the room volume as 250m
2
×2.5m=625m
3
)
Example: Total refrigerant charge in the system is 45 kg and room volume is
300m
3
. 45/300=0.15, which is >QLMV (0.074) and <QLAV (0.18), therefore install
at least 1 appropriate measure in the room.
A (kg)
B (m³)
0
0
100 15050 200 250 300 350 450 550400 500 600 650 700 750 800 850 900 950 1000
5
10
15
20
25
30
35
40
45
50
55
60
65
70
c
b
a
QLMVQLAV
14‒1 Example graph for calculation
A Refrigerant charge
B Room volume
a 2 appropriate measures required
b 1 appropriate measure required
c No measure required
For occupancies on the lowest underground floor of the building
If the total refrigerant charge (kg)
divided by the room volume
(a)
(m
3
) is…
…the number of appropriate measures
must be at least…
<RCL 0
>RCL and ≤QLMV 1
>QLMV and <QLAV 2
>QLAV Value CANNOT be exceeded!
(a)
For occupied spaces with a floor area exceeding 250m
2
, use 250m
2
as the floor area for
determination of the room volume (Example: even if the room area is 300m
2
and the
room height is 2.5m, calculate the room volume as 250m
2
×2.5m=625m
3
)
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.