Daikin EKEXVA350 handleiding
Handleiding
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11 About the system
Installation and operation manual
15
EKEACBVE + EKEXVA50~500
Option kit for combination of Daikin outdoor units with field-
supplied air handling units
4P724517-1B – 2024.03
11.6.3 VRV outdoor units
The control box can be connected to some types of VRV outdoor
units (see the Engineering Data Book for outdoor units that are in
scope) with a maximum number of 3 connectable control boxes to
one outdoor system in case of X,Y,W control. In case of Z and Z'-
control, the number of boxes depends on connection ratio and
capacity of the outdoor unit. A single control box can only be
combined with one expansion valve kit.
11.7 Air handling unit
NOTICE
▪ For R410A: The design pressure of the connected air
handling unit MUST be minimum 4.0MPa (40bar).
▪ For R32: The design pressure of the connected air
handling unit MUST be minimum 4.17MPa (41.7bar).
NOTICE
The connected air handling unit MUST comply with the
requirements of the International Standard
IEC60335-2-40:2022.
NOTICE
EKEA and EKEXVA are only parts of an air handling unit
system, complying with partial unit requirements of the
International Standard IEC 60335-2-40:2022. As such,
they must ONLY be connected to other units that have
been confirmed as complying to corresponding partial unit
requirements of this International Standard.
For installation of the air handling unit, see the air handling unit
installation manual.
The connected air handling unit must be designed for R410A or R32
applications.
In case of R32 systems that require safety measures, take the
following safety requirements into account:
▪ The air handling unit must be capable of supplying a minimum
airflow rate (Q
min
) for R32 safety. See "Figure 2" [4 3]. Based on
the conditioned space and the refrigerant amount, the air handling
unit should make sure it operates only in the circulation airflow
region (zone 1 in "Figure 2" [4 3]). Continuous monitoring of the
supply air flow rate is essential to ensure the safety of conditioned
spaces, and preventing the potential dangers associated with high
refrigerant concentrations
▪ The air handling unit must be equipped with supply and return air
isolation dampers.
AHU
c
b
g
f
d
a
e
AHU Air handling unit
a Conditioned space
b Outdoor air
c Exhaust air
d Supply air
e Extract air
f Supply damper
g Return damper
▪ The presence of dampers will allow to:
▪ Block the mixture of air and refrigerant going inside the building,
in the case of a leak;
▪ Establish a safe situation even though the compressor of the
VRV system would continue operating (e.g. defrost operation)
▪ The air handling unit should be able to output an additional signal
to T5T6 (R32 safety related), in case the airflow rate supplied by
the air handling unit would drop below legal requirements. The air
handling unit must be able to check the current airflow rate and
compare it to the minimum airflow rate (Q
min
). See T5T6
specifications in "11.3Operation signals"[413].
▪ When the fans of the air handling unit are stopped, the supply and
return isolation dampers need to close.
11.8 Connection ratio and heat
exchanger volume limitations
Connection ratio and heat exchanger volume limitations for pair
and multi AHU layouts
The connection ratio limit depends on the AHU layout.
For pair and multi AHU layouts, the lower limit of the connection ratio
is 75% in general. However, if more strict requirements for the heat
exchanger volume are satisfied, the lower limit of the connection
ratio is 65%.
See the manual of the outdoor unit for more detailed information.
For ERQ, these connection ratio limitations are NOT applicable.
Follow the combination table in "11.6.2 ERQ outdoor units" [4 14]
instead.
Heat exchanger volume limitations
The limitations for the volume of the AHU heat exchanger are shown
in the table below. In case of pair and multi AHU layouts, for
connection ratios between 65% and 75%, more strict limitations are
applicable.
In case of ERQ, follow the general limits in the table below to get the
minimum heat exchanger volume.
Capacity
class
Minimum heat exchanger volume [dm³]
General limits (65%≤CR<75%)
Only for pair and multi
AHU layouts
50 0.95 1.09
63 1.02 1.18
80 1.42 1.64
100 1.51 1.74
125 1.98 2.29
140 2.54 2.94
200 3.02 3.49
250 3.97 4.58
300 4.53 5.23
350 5.48 6.32
400 6.04 6.97
450 6.99 8.07
500 7.55 8.72
CR Connection ratio
11.9 Master-slave configuration
In case of interlaced heat exchanger applications, a master-slave
configuration of EKEA can be used to reduce the number of cables
installed in the field. This is achieved by having a unique master
control box, which has all the external inputs/outputs (I/O), and
several slaves with a limited number of external I/O.
Bekijk gratis de handleiding van Daikin EKEXVA350, 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 | EKEXVA350 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 5939 MB |
