Daikin ATB03RA, Technical Data Manual

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Databook Modular T - October 2022 - Rev. 00 15
The units, in fact, can accommodate on supply air stream up to three filters at the same time (M5+F7+F9).
In order to avoid the fast clogging of the fine filter from gross particles, units can also provide a class G4 pre
– filter on supply side.
According to the hygienic requirements of the VDI 6022, filter frames are designed in such a way so they can
be easily extracted and cleaned.
The filter replacement is carried out from the front side opening the removable or hinged door.
The filters replacement trigger is activated through pressure differential transducers, following the provision
of EU 1253/2014. Replacement filters are available as a standard accessory.
4.9. Control system
4.9.1. Pro Controls
Unit control system is provided on the basis of a programmable direct digital controller (DDC). Its software
allows user configuration setting based on original manufacturer logics.
The unit controls are factory mounted and fully operational at site.
A web server (HMI) is also provided as a standard feature.
The unit offers the possibility to be integrated into BACnet/IP or Modbus-RS485 based BMS through
dedicated accessories. The unit is connectable to a Cloud monitoring system (optional).
The unit is able to operate either in CAV or VAV systems. For the constant air volume (CAV) logic the unit
provides a constant airflow regardless of system pressure drops. For the variable air volume (VAV) logic the
unit guarantees a constant static pressure in a specific point of the system, through dedicated accessory
(Digital PCB for exernal accessories: ATE00PDUA), while the airflow measurement remains available for
reading.
The unit is able to control the indoor air quality by controlling and monitoring the CO2 level (CO2 sensor is
optional). In fact, when the threshold value is overcome, the control forces the fan to increase the extracted
and supplied air volume in order to decrease the CO2 level faster.
When signals are received, the units vary its fan speed proportionally until the desired set points are met.
An optional humidity sensor is available for the control of the humidity condition when a cooling coil is
present. If temperature control is also needed, a post heating coil has to be present too.
The automatic operation of the bypass, instead, is determined by an algorithm that varies output based on
temperature evaluations. Bypass control provides free cooling operation based on dry bulb temperatures
and enthalpies (optional) through additional humidity probes (accessories). Defrost operation together with
a modulating internal water heating coil (if available) is also possible, in order to give the best solution in
terms of energy efficiency and cost reduction.
Units fit four temperature probes to measure: Supply air temperature, Return Air temperature, Fresh air and
Exhaust Air Temperature.