Daikin EKEXVA350 handleiding
Handleiding
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12 Special requirements for R32 units
Installation and operation manual
20
EKEACBVE + EKEXVA50~500
Option kit for combination of Daikin outdoor units with field-
supplied air handling units
4P724517-1B – 2024.03
Clarification figure of the smallest room area, the total conditioned
space area, and the area of installation location.
A1
B
A2
A3
C
A1 Floor area of conditioned room 1 and smallest room area
A2 Floor area of conditioned room 2
A3 Floor area of conditioned room 3
A
tot
= A1 +A2 + A3
B Floor area of the installation location
C Air handling unit (AHU)
For R32 applications requiring a minimum airflow (Q
min
) as a safety
measure, the AHU manufacturer must ensure that the AHU supply
air flow rate is set in such a way that its potential fluctuation during
normal operation cannot make its value go below Q
min
, triggering the
air flow rate malfunction error on the EKEA.
Example: Q
min_set
= Q
min
+ 10% Q
min
Q
t
Q
min
Q
min set
a
Q
min
Minimum required supply airflow rate
Q
min_set
Minimum air flow rate set on the AHU
a Actual air flow rate
12.2.1 Example 1
Installation of 6 HP R32 system:
▪ Total conditioned space area: 100m²
▪ Smallest room area: 35m²
▪ Release height (h
0
): 2.2m
▪ Total refrigerant charge: 6.6kg
▪ Outdoor installation of air handling unit
0
2
4
6
8
10
12
14
16
m
c
[kg]
0 40 80 100 120
[m
2
]
16020 60 140
h
0
=1.8 m
h
0
=2.2 m
h
0
=2.5 m
1: Requirements for spaces served by AHU (m
c
≤16 kg)
Measures must be provided
following figures 2 and 3
No R32 safety requirements
35=A
room
27.6=A
min_room
6.6
Based on figure 1, no R32 safety measures are required
(A
room
>A
min_room
).
12.2.2 Example 2
Installation of 8 HP R32 system:
▪ Total conditioned space area: 140m²
▪ Smallest room area: 50m²
▪ Release height (h
0
): 2.2m
▪ Total refrigerant charge: 14.4kg
▪ Outdoor installation of air handling unit
Based on the smallest room area, "Figure 1"[42] indicates to follow
the requirements in figures 2 and 3.
0
10000
12000
14000
16000
8000
6000
Q [m³/h]
100 20 30 40 50 60 70 80
m
c
[kg]
Zone 1:
Q>Q
min
Zone 2:
Actions required
2: Minimum circulation airflow
0
30
40
50
60
70
80
m
c
[kg]
0 50 100 125 150
[m
2
]
200 25025 75 175 225
3b: Requirements for spaces
served by AHU
Zone 3: Out of scope standard
Zone 2:
Circulation airflow
+
Mechanical extraction
Zone 1:
Only circulation
airflow required
A
min
=43 140=A
tot
14.4
14.4
2814
▪ Based on figure 3b, only circulation airflow is required (A
tot
>A
min
).
▪ Based on figure 2, the minimum circulation airflow needs to
remain above 2814m³/h.
Conclusion: As long as the supplied airflow rate is above the
minimum legal requirement (2814 m³/h), no additional limitations
apply to this VRV R32 system.
12.2.3 Example 3
Installation of 8 HP R32 system:
▪ Total conditioned space area: 140m²
▪ Smallest room area: 50m²
▪ Release height (h
0
): 2.2m
▪ Total refrigerant charge: 14.4kg
▪ Indoor installation of air handling unit in a space of 20m²
Based on the smallest room area, "Figure 1"[42] indicates to follow
the requirements in figures 2 and 3.
0
10000
12000
14000
16000
8000
6000
Q [m³/h]
100 20 30 40 50 60 70 80
m
c
[kg]
Zone 1:
Q>Q
min
Zone 2:
Actions required
2: Minimum circulation airflow
0
30
40
50
60
70
80
m
c
[kg]
0 50 100 125 150
[m
2
]
200 25025 75 175 225
3b: Requirements for spaces
served by AHU
Zone 3: Out of scope standard
Zone 2:
Circulation airflow
+
Mechanical extraction
Zone 1:
Only circulation
airflow required
A
min
=43 140=A
tot
14.4
14.4
2814
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Productinformatie
| Merk | Daikin |
| Model | EKEXVA350 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 5939 MB |
