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12 Special requirements for R32 units
Installation and operation manual
18
BS4~12A14AJV1B9
VRV 5 branch selector unit
4P797565-1 – 2024.11
Ductwork The evacuation ductwork MUST vent outside the
building or to another room having the minimum
room area greater than the value mentioned in the
below graph or table.
Avoid that dirt, dust and small animals can enter
the ductwork and lead to an obstruction. Example:
Install a non-return valve, grill, filter or other
component in the evacuation duct.
Extraction fan The extraction fan must have a CE marking and
cannot act as an ignition source during normal
operation. This requirement is met if the fan motor
has an IP4X rating or better.
Replacement
air
Make sure that sufficient replacement air is
available for the extraction of a refrigerant leak.
The extraction airflow rate must be maintained for
at least 8hours. This is achieved by providing a
sufficiently large air volume around the BS unit or
by providing sufficient replacement air around the
BS unit (e.g. natural openings or a dedicated
opening in the false ceiling).
Maintenance Maintain the evacuation channel to avoid dust and
dirt from building up and obstructing the flow path.
In case of venting to another room, use the graph or table below to
determine the minimum room area limit of the space where ducting
is venting to:
0
200
400
600
800
1000
1200
1400
160
1800
2000
2200
2400
2600
2800
3000
3200
3400
3600
3800
4000
4200
50 25 30 35 40 45 50 55 60 65201510 70 75 80
m
[kg]
A
0
[m
2
]
A
0
[m²]m
[kg] A
0
[m²]m
[kg]
2 3.9
3 5.9
4
1 2.0
10.1
5 15.8
6 22.8
7 31.0
8 40.5
9 51.3
10 63.3
11 76.6
12 91.2
13 107
14 125
15 143
16 163
17 183
18 206
19 229
20 254
21 280
22 307
29 533
30 570
31
28 497
609
32 649
33 690
34 732
35 776
36 821
37 867
38 915
39 963
40 1013
45 1282
50 1583
55 1915
60 2279
65 2675
70
75
79.8
3102
3561
4032
23 335
24 365
25 396
26 428
27 462
m Total refrigerant charge in the system [kg]
A
0
Minimum room area of the space where ductwork is
venting [m²]
Note: Round up the derived values.
The graph and table are based on the bottom of the duct opening
height into another room between 1.8 m and 2.2 m. The bottom of
the duct opening height is the height of the bottom of the duct to the
lowest point of the floor.
If the bottom of the duct opening height is more than 2.2 m, lower
minimum room area limit can apply where the ventilated enclosure
ductwork is venting. To know the minimum room area in case the
bottom of the duct opening height is more than 2.2 m, refer to the
online tool (VRV Xpress).
One BS unit – one extraction fan
In the most simple configuration, each BS unit in the system has its
own evacuation channel and its own extraction fan.
a b c
a BS unit
b Ductwork
c Extraction fan
An extraction fan must be connected to the BS unit, see "15.5 To
connect the external outputs"[435].
In order to size the fan, calculate the required pressure capacity. The
total pressure drop in the evacuation channel consists of multiple
parts: the pressure drop generated by the BS unit and the pressure
drop generated by the components of the ductwork.
Select an airflow rate for the evacuation that meets the legal
requirements. This means that the airflow rate is above the legally
required minimum, and generates sufficient pressure difference
inside the BS unit when compared with the pressure of the
surroundings. The minimum required airflow rate (AFR
OUT
) is
18.8 m³/h, and the pressure drop generated by the BS unit should
lead to a pressure inside the BS unit (P
internal
) that is more than 20Pa
below the pressure of the surroundings.
a
P
internal
AFR
OUT
a BS unit
AFR
OUT
Airflow
P
internal
Internal pressure
It is advised to take a safety margin on these minimum values when
designing the evacuation channel in order to account for tolerances
on parts, dirt and dust building up in the evacuation channel over
time, etc.
Note: The internal pressure of the BS unit should not be more than
350Pa below the pressure of the surroundings.
Write down the pressure drop generated by all the components in
the evacuation channel for the selected airflow rate. For the BS unit,
use the curve that presents the pressure at the outlet (P
OUT
) in
function of the airflow rate (AFR
OUT
). See the latest version of the
technical engineering data for the pressure drop curves of the BS
unit.
a
P
OUT
AFR
OUT
a BS unit
AFR
OUT
Airflow
P
OUT
Outlet pressure
For the pressure drop caused by other components of the
evacuation channel (ducts, bends, etc.), use the curves of the
manufacturer.
Use the airflow rate and the sum of the pressure drops to select a
suitable fan.
Example
a b
d f gi he
c
a BS unit
b~h Ductwork (duct, bend, reducer, expander, non-return
valve, wall grill, etc.)
i Extraction fan
In this example we use a BS12A unit. Use the curve of the internal
pressure inside the BS unit (P
internal
) in function of the airflow rate
(AFR
OUT
). When an airflow rate of 115m³/h is selected, the pressure
inside the BS unit is 42.9Pa below the pressure of the surroundings.
So this airflow rate is above the required 18.8m³/h and the pressure
inside the BS unit is within the range of 20~350 Pa below the
pressure of the surroundings. We use this 115 m³/h airflow rate for
further calculations.
Bekijk gratis de handleiding van Daikin BS8A14AJV1B9, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Daikin |
| Model | BS8A14AJV1B9 |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 8827 MB |
