Daikin ATB03RA Instruction manual

Databook Modular T - October 2022 - Rev. 00 1
ASTRA WEB Version 10.1.13.1
Air Handling Unit
Technical Data
Modular T

Databook Modular T - October 2022 - Rev. 00 2
Index
1. Features..................................................................................................................................................... 4
2. Unit Description and configurations.......................................................................................................... 5
3. Standard material name –base module ................................................................................................... 6
4. Specifications............................................................................................................................................. 7
4.1. Technical Data ........................................................................................................................................ 7
4.1.1. Nominal Data................................................................................................................................... 7
4.1.2. Sectioning ........................................................................................................................................ 8
4.1.3. Nominal Air Flow ........................................................................................................................... 11
4.2. Electrical Data....................................................................................................................................... 11
4.3. Declaration EU. REG. 1253/2014.......................................................................................................... 12
4.4. Bearing structure.................................................................................................................................. 13
4.5. Insulation .............................................................................................................................................. 13
4.6. Heat Exchanger..................................................................................................................................... 13
4.7. Fans....................................................................................................................................................... 13
4.7.1. Pro Version .................................................................................................................................... 13
4.7.2. Smart Version ................................................................................................................................ 13
4.8. Filters .................................................................................................................................................... 14
4.9. Control system...................................................................................................................................... 15
4.9.1. Pro Controls ................................................................................................................................... 15
4.9.2. Smart Controls............................................................................................................................... 16
4.10. Default Values .................................................................................................................................... 17
4.10.1. Pro Version .................................................................................................................................. 17
4.10.2 Smart version................................................................................................................................ 18
4.11. Antifreeze Logic .................................................................................................................................. 19
4.11.1. Pro Version .................................................................................................................................. 19
4.11.2. Smart Version .......................................................................................................................... 20
4.12. Operating Limits ................................................................................................................................. 22
4.12.1. Pro Version .................................................................................................................................. 22
4.12.2. Smart Version .............................................................................................................................. 23
5. Accessories .............................................................................................................................................. 24
5.1. Accessories list...................................................................................................................................... 24
5.2. Accessories for Pro & Smart version .................................................................................................... 26
5.2.1. Filters ............................................................................................................................................. 26
5.2.2. Silencers......................................................................................................................................... 27

Databook Modular T - October 2022 - Rev. 00 3
5.3. Accessories only for Pro version........................................................................................................... 27
5.3.1. Useful information......................................................................................................................... 27
5.3.2. Coils ............................................................................................................................................... 28
5.3.3. Valves............................................................................................................................................. 31
5.3.4. Dampers ........................................................................................................................................ 32
5.3.5. Electrical accessories ..................................................................................................................... 32
5.4. Accessories only for Smart version....................................................................................................... 33
5.4.1. Coils ............................................................................................................................................... 33
6. Performance ............................................................................................................................................ 34
6.1. Performance data................................................................................................................................. 34
6.2. Thermal efficiency ................................................................................................................................ 37
6.3. Sound emission..................................................................................................................................... 39
6.4. Dimensional Drawings .......................................................................................................................... 44

Databook Modular T - October 2022 - Rev. 00 4
1. Features
Heat recovery unit with top connections for decentralised ventilation system
•Available in 5 sizes with an air flow from 200 m3/h up to 4200 m3/h, ErP 2018 compliant
•More than 500 Pa of external static pressure, depending on model size and conditions
•Smallest size is 550 mm wide, while the biggest size only 890 mm
•Energy saving solution thanks to the 100% automatic bypass
•Reduced energy consumption thanks to EC fan technology and IE5 motor efficiency
•Free-cooling operation and energy efficient defrost logic
•Aluminium counter flow plate heat exchanger with efficiency up to 93%
•Up to three filters on supply side, up to ePM2.5 50% (M5) + ePM1 50% (F7) + ePM1 80% (F9)
•CO2 level management thanks to optional CO2 sensor
•50 mm double skin panels, mineral wool insulated
•Modbus and BACnet compatible (accessory)
•DX, water and electric coil available as option
•Mixing damper to allow mix/recirculated air operation, available as accessory
•Ideal solution for light commercial applications as: retail shops, small and large offices, hotels, gyms,
cinemas, theatres, school, colleges, universities, etc
•Left or right hand version
•Smart (Daikin F1-F2/P1-P2 communication protocol) or Pro (Open protocol) version

Databook Modular T - October 2022 - Rev. 00 5
2. Unit Description and configurations
Components:
1. Bypass damper
2. Ducts
3. Heat Exchanger
4. Return fan
5. V –Shaped feet
6. Supply fan
7. Supply filter
8. Return Filter
9. Control
10. Drain Pain
Airflow direction
A. Exhaust air
B. Fresh air
C. Return air
D. Supply air
Modular T is available in two configurations for connection side, right and left (looking to the position of
supply air flow standing in front of the installed unit).
Left version
Right version

Databook Modular T - October 2022 - Rev. 00 6
3. Standard material name –base module
Product
Components
Size
Connection
side
Model
revision
Controls
Digit
1
2
3
4
5
6
7
8
A
T
B
0
3
R
A
M
Character
A = AHU
T = Modular T
B = Base
module
03 = Size 03
04 = Size 04
…
07 = Size 07
R = Right
L = Left
A = First
release
B =
Second
release
M = Pro
solution
S = Smart
solution
Standard unit is provided with:
•Aluminium counter flow plate heat exchanger
•EC Fan with IE5 motor efficiency class
•ePM1 50% (F7) filter on supply air
•ePM10 75% (M5) filter on return air
•Double skin panel (inner Aluzinc AZ185, outer pre –painted)
•Control:
oPro version: programmable controller
oSmart version: Smart controller (VAM control)
For Pro version, the room thermostat and user interface ALC00822A is included with the main unit.
For Smart version, the BRC thermostat/remocon is not included with the main unit and has to be povided
separately.
Nomenclature:
SB. = Sales Bom: sales tool used for Make to stock products shipped in two o more sections.
Modular T
Pro
Main Unit
Right
Left
Size 03
ATB03RA
ATB03LA
Size 04
ATB04RA
ATB04LA
Size 05
SB.ATB05RA
SB.ATB05LA
Size 06
SB.ATB06RA
SB.ATB06LA
Size 07
SB.ATB07RA
SB.ATB07LA
Modular T
Smart
Main Unit
Right
Left
Size 03
ATB03RAS
ATB03LAS
Size 04
ATB04RAS
ATB04LAS
Size 05
SB.ATB05RAS
SB.ATB05LAS
Size 06
SB.ATB06RAS
SB.ATB06LAS
Size 07
SB.ATB07RAS
SB.ATB07LAS

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4. Specifications
4.1. Technical Data
4.1.1. Nominal Data
Material
Name 1
ATB03*A*
ATB04*A*
SB.ATB05*A*
SB.ATB06*A*
SB.ATB07*A*
Size
03
04
05 2
06 3
07 3
Airflow
m3/h
800
1650
2300
2700
3900
HE Thermal
efficiency 4
%
89,3
88,3
85,1
85,5
90,8
External static
pressure
Pa
100
100
100
100
100
Current
A
1,7
3,39
4,61
5,17
7,87
Power input
kW
0,39
0,78
1,06
1,19
1,81
SFPv
kW/m3/s
1,47
1,5
1,49
1,41
1,5
Electrical supply
Phase (ph)
1
Frequency
(Hz)
50 - 60
Voltage (V)
220 - 240
Main unit
Dimensions
Width (mm)
550
790
790
790
890
Heigth (mm)
6
1600
1600
1900
1850
2050
Length (mm)
1580
1650
2170
2620
2950
Circular duct flange
Diameter
(mm)
250
315
355
400
500
Unit sound
power level
dB(A)
57
52
55
55
58
Unit sound
pressure level 7
dB(A)
50
45
48
48
51
Net Weight Unit
kg
200
250
400
500
620
1. For ATB03*A* we refer to all the versione of Modular T size 03 (left or right and Smart or Pro)
2. Size 05 is provided in two sections (600mm + 1570mm).
3. Size 06 and 07 are provided in three sections (710mm + 1430mm + 480mm) and (810mm + 1560mm + 480mm).
4. Outdoor air condition: -5°C/90%, extract air condition: 25/50%
5. Height of the unit taking into account the feets, mounted on site, (100mm) and duct joints (50mm)
6. Sound pressure at 1m with in (directivity factor Q = 4) in non reverberant field. Allowances on declared values: +/- 3dB.

Databook Modular T - October 2022 - Rev. 00 8
4.1.2. Sectioning
To ensure an easy and quick transportation and installation biggest sizes are provide in more sections.
The following table summarize the number of sections for each size.
Material Name
Size
Number of sections
ATB03*A*
03
1
ATB04*A*
04
1
ATB05*A*
05
2
ATB06*A*
06
3
ATB07*A*
07
3
For the units provided in more sections, size 05, 06 and 07, there is an easy rule to follow up, to identify the
position of the sections, valid for both right and left version of the unit.
Section 1 always refer at supply air flow while section 2 contains the heat exchanger. In this way for right
version, the section 1 is on the right of section 2, while for left version it is on the left.
For size 06 and 07, that are divided into three sections, the third one is the control section. It will be installed
on the left of section 2 for right version and on the right of the section 2 for left version.
Section and size
Length
(mm)
Width
(mm)
Height
(mm)
Net Weight
(kg)
Gross
Weight (kg)
Main unit, size 03
1580
550
1600
200
210
Main unit, size 04
1650
790
1600
250
260
Section 1, Size 05
600
790
1900
130
140
Section 2, Size 05
1570
790
1900
270
280
Section 1, Size 06
710
790
1850
140
150
Section 2, Size 06
1430
790
1850
260
270
Section 3, Size 06
480
790
1850
100
110
Section 1, Size 07
810
890
2050
180
190
Section 2, Size 07
1560
890
2050
320
330
Section 3, Size 07
580
890
2050
120
130

Databook Modular T - October 2022 - Rev. 00 9
Size 05 –Right configuration
Size 05 –Left configuration
Supply air
Return air
Fresh air
Exhaust air

Databook Modular T - October 2022 - Rev. 00 10
Size 06 & 07 –Right configuration
Supply air
Return air
Fresh air
Exhaust air
Size 06 & 07 –Left configuration

Databook Modular T - October 2022 - Rev. 00 11
4.1.3. Nominal Air Flow
For any performances out of the nominal condition here above mentioned kindly refer to the online selection software
available online at tools.daikinapplied.eu
4.2. Electrical Data
Material Name
ATB03*A*
ATB04*A*
SB.ATB05*A*
SB.ATB06*A*
SB.ATB07*A*
Size
03
04
05
06
07
Power
Supply
Phase
-
1
Frequency
Hz
50-60
Voltage
V
220-240
Full load
condition
FLA
A
1.7
3.4
4.6
5.2
7.9
FLI
W
390
780
1060
1190
1820
800
1650
2300
2700
3900
0500 1000 1500 2000 2500 3000 3500 4000 4500
Air Flow rate (m3/h)
Size 4
Size 5
Size 6
Size 3
Size 7
From 200 up to 4200 m3/h
Nominal airflow m3/h

Databook Modular T - October 2022 - Rev. 00 12
4.3. Declaration EU. REG. 1253/2014
Material Name
ATB03*A*
ATB04*A*
SB.ATB05*A*
SB.ATB06*A*
SB.ATB07*A*
Size
3
4
5
6
7
Manufacturer’s name
Daikin Applied Europe
Typology (NRVU, UVU / BVU) *
NRVU BVU
Type of drive
Inverter (included on the electronic fan)
Type of HRS
Other
Thermal efficiency of
the HR
%
76.8
75.7
73.4
76.7
78.2
Nominal NVRU
Flow rate
Supply
m3/s
0.22
0.46
0.64
0.75
1.08
Return
m3/s
0.22
0.46
0.64
0.75
1.08
Effective Electric Power
input
kW
0.39
0.78
1.06
1.19
1.81
SFP internal
W/(m3/s)
756
846
799
756
866
Face velocity at
design air flow
rate
Supply
m/s
1.29
1.71
1.75
1.68
1.87
Return
m/s
1.29
1.71
1.75
1.68
1.87
Internal
Pressure Drop
of Ventilation
Components
Supply
Pa
188
265
261
246
276
Return
Pa
193
274
270
255
286
Nominal
External
Pressure Drop
Supply
Pa
100
Return
Pa
100
Static efficiency
of fans
Supply
%
51
65
68
68
68
Return
%
51
65
68
68
68
Maximum
external Leakage
+ 400
%
3
3
3
3
3
- 400
%
2
2
2
2
2
Maximum internal Leakage
%
2.5
2.5
2.5
2.5
2.5
Summer
Outdoor
Conditions
Temp.
°C
34
RH
%
50
Winter Outdoor
Conditions
Temp.
°C
-5
RH
%
90
Filter Energy Classification
-
Filter Service Warning **
Displayed on controller
Sound Power Level
dBA
57
53
55
55
58
Pre-/Dis- assembly instructions
https://www.daikinapplied.eu/ahu-instructions-for-pre- disassembly/
* In accordance with Commission Regulation (EU) No 1253/2014 of July 2014
** Clean/replace Filter(s) when maximum pressure drop is reached or when warning is displayed on HMI controller

Databook Modular T - October 2022 - Rev. 00 13
4.4. Bearing structure
The units feature double-skin panels that consist of two folded steel sheets. Panel thickness is 50 mm for all
unit sides. The standard versions provide Aluzinc AZ185 for the inner skin and pre-coated steel for the outer
skin. The units are constructed with removable or hinged doors allowing full maintenance access. The units
are equipped with circular flanges with gasket sealing to be connected to a circular ductwork on top.
4.5. Insulation
Insulation material used is mineral wool with a density of 120 kg/m3 (EN 1602).
Thermal conductivity is 0.036 W/m*K and mineral wool is A1 class for fire classification (EN13501-1).
4.6. Heat Exchanger
The units feature a counterflow plate heat exchanger (PHE). The PHE is able to recover up to 93% of thermal
energy in wet conditions.
They are made of aluminium alloy with a minimum content of iron and copper (to avoid corrosion issues).
PHE is Eurovent certified and protected by minimum ePM10 80% (M5) & ePM150% (F7) grade pleated filters
on extract and supply aire sides. PHE incorporates an automatic bypass with two counterrotating dampers
with actuator and a condensation drain pan with opportune slope.
4.7. Fans
4.7.1. Pro Version
The units comply with ErP 2018 rated and have IP54 EC fan/motor assemblies. EC fans are of IE5 efficiency
class. Fans provide low specific fan power (SFP) and a stepless speed control.
According to their energy balance, performances, flow and noise characteristics the rotor shall be made by
plastic (reinforced if necessary). The airflow rate shall be measured on the fan arrangement in real time.
Fans can provide a constant air volume regardless filter clogging or duct/system pressure drops (within the
fans operation limits).
They are also able to provide a fixed pressure value regardless the supplied air volume or the pressure drops’
changes in the system, while keeping the airflow information coming from the fans.
In terms of power supply, the unit must operate on 220/240 V AC, 50/60 Hz single-phase main supply.
4.7.2. Smart Version
The units comply with ErP 2018 rated and have IP54 EC fan/motor assemblies.
EC fans are of IE5 efficiency class. Fans provide low specific fan power (SFP) and a stepless speed control.
According to their energy balance, performances, flow and noise characteristics the rotor shall be made by
plastic (reinforced if necessary).
Fans can run at least at 2 speeds (to be selected among 45 different operating points).
In terms of power supply, the unit must operate on 220/240 V AC, 50/60 Hz single-phase main supply.

Databook Modular T - October 2022 - Rev. 00 14
4.8. Filters
Filter types are plane (compact) made with fibreglass material.
All the filters - regardless of their type –are mounted in opportune rails equipped with a mechanical frame
that maintains the filters in pressure a high sealing along the full perimiter.
The available filter grades are: ISO Coarse 55% (G4), ePM10 80% (M5), ePM150% (F7) and ePM180% (F9). They
can be combined to meet any kind of requirement.
The units come standard with ePM10 80% (M5) and ePM150% (F7) filters respectively for extract and supply air
side. In accordance with ISO 16890, the unit can reach SUP (supply air categories) 1 level from ODA (outdoor
air categories) 3 level.
The recommended minimum efficiencies depending on ODA and SUP categories are summarised in the
following table.
Supply air class
Outdoor Air Quality
SUP 1 (High)
SUP 2 (Medium)
SUP 3
(Moderate)
SUP 4 (Low)
ODA 1
(Pure Air)
ePM1 70%
ePM1 50%
ePM2.5 50%
ePM10 50%
ODA 2
(Dust)
ePM1 80%
ePM1 70%
ePM2.5 70%
ePM10 80%
ODA 3
(Very high concentration of dust)
ePM1 90%
ePM1 80%
ePM2.5 80%
ePM10 90%
The recommended filter combination depending on ODA and SUP categories are summarised in the following
table.
Supply air class
Outdoor Air Quality
SUP 1 (High)
SUP 2 (Medium)
SUP 3
(Moderate)
SUP 4 (Low)
ODA 1
(Pure Air)
F9
F7
F7
F7
ODA 2
(Dust)
F9
F9
F9
F7
ODA 3
(Very high concentration of dust)
F7 + F9
F9
F9
F9
For easy reference, the EN779:2012 has been replaced by the ISO 16890. The new naming is included in the
following table.
Filter name (EN 779)
Filter name (ISO 16890)
ePM1
ePM2,5
ePM10
G4
ISO Coarse 55%
N/A
M5
ePM10 75%
40%
50%
75%
F7
ePM150%
50%
60%
80%
F9
ePM180%
80%
85%
90%

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.

Databook Modular T - October 2022 - Rev. 00 16
Modular T Control
Control platform
Programmable controller
Remote controller
Room controller: ALC00822A
Commissioning tool: ALC00895A
Co2 control
Yes, ALP00COA (mandatory accessory)
RH% control
Yes, ALP00HUA (mandatory accessory)
BMS Connectivity
BACnet/IP: ALC00908A (accessory)
Modbus –RS485: ALC00902A (accessory)
Ethernet connection
WEB –Human Machine Interface (web server)
Cloud connection
Daikin on Site
4.9.2. Smart Controls
Modular T Smart can be directly integrated into DIII-net ecosystem and controlled through any Daikin local,
centralised controllers (iTAB, iTM, iTC) or Cloud controllers (Daikin Cloud Service).
This communication, based on the common F1-F2 and P1-P2 protocol, guarantees also fully compatibility
with SkyAir and VRV systems.
The remote controller BRC1[E/H] is not provided with the main module and has to be provided separately.
Modular T Smart comes standard with 2 sensors fitted on the fresh and return air side.
The temperature control done by the unit is to compare outside temperature with inside temperature, to
decide whether to operate in “heat exchange” or in “bypass mode” in case the user selects “auto mode”
(please refer to the table below).
Mode
Description
Auto mode
Using information from the air conditioner
(cooling, heating, fan and set temperature) and
heat reclaim ventilation unit (indoor and
outdoor temperatures), this mode
automatically changes between Energy Reclaim
Ventilation and Bypass mode
Energy Reclaim Ventilation mode
The outdoor air is supplied to the room after
passing through a heat exchanger element,
where heat is exchanged with the return air
Bypass mode
The outdoor air bypasses the heat exchanger
element. This means that outdoor air is
supplied to the room without exchanging heat
with the return air
The unit is connectable to a Cloud monitoring system (optional).
BACnet or Modbus integration is possible through interfaces (optional).
The unit is able to control the indoor air quality by controlling and monitoring the CO2 level (CO2 sensor is
optional).

Databook Modular T - October 2022 - Rev. 00 17
Modular T Control
Control platform
Daikin Control PCB
Remote controller
Room controller: Optional BRC 1 [E/H]
Co2 control
Optional, BRYMA2000 sensor
BACnet or Modbus integration
Through interfaces (optional)
Cloud connection
Daikin Cloud Service
4.10. Default Values
4.10.1. Pro Version
All the unit are pre factory set at nominal value summarize in the table below. All the values can be
changed using the Commissioning Module (ALC00895A).
Modular T
Material
Name
ATB03*A
ATB04*A
ATB05*A
ATB06*A
ATB07*A
Costant air
volume (CAV) 1
Auto (m3/h)
800
1650
2300
2700
3900
Eco (m3/h)
400
825
1150
1300
1950
Variable air
volume (VAV) 2
Auto (Pa)
100
100
100
100
100
Eco (Pa)
50
50
50
50
50
Supply air
Temperature
Winter
22 °C
Summer
22 °C
CO2Control 3
Trigger
value (PPM)
1000
1000
1000
1000
1000
Max forcing
%
25% of the maximum fan speed
Schedule 1
Time
08:00 –18:00
Day
Monday –Friday
Filter
Replacement 4
M5 (Pa)
250
F7 (Pa)
250
1. Pre-set values (Default)
2. Values fixed but not enabled (VAV kit required)
3. Values fixed but not enabled (ALP00COA CO2 probe accessory mandatory)
4. Trigger value for filters’ replacement. In case of non – standard filters, the installer needs to change manually the
differential pressure value in accordance with the filter class. The recommended values are mentioned in the filter
accessory section.

Databook Modular T - October 2022 - Rev. 00 18
4.10.2 Smart version
Factory set values for nominal operating airflow and corresponding setting for the BRC1[E/H].
Please refer to the IOM, in order to determine new operating points and new unit setting for various speeds.
Size 03
Supply
Exhaust
Volume Flow rate
ESP
Volume Flow rate
ESP
800
100
800
100
RPM
RPM
2310
2276
Fan speed (High –Ultra High)
17(27)-4-01
Fan Curve Supply
Fan Curve Return
19(29)-2-09
19(29)-3-05
Size 04
Supply
Exhaust
Volume Flow rate
ESP
Volume Flow rate
ESP
1650
100
1650
100
RPM
RPM
2835
2873
Fan speed (High –Ultra High)
17(27)-4-02
Fan Curve Supply
Fan Curve Return
19(29)-2-09
19(29)-3-10
Size 05
Supply
Exhaust
Volume Flow rate
ESP
Volume Flow rate
ESP
2300
100
2300
100
RPM
RPM
2743
2692
Fan speed (High –Ultra High)
17(27)-4-02
Fan Curve Supply
Fan Curve Return
19(29)-2-11
19(29)-3-08

Databook Modular T - October 2022 - Rev. 00 19
Size 06
Supply
Exhaust
Volume Flow rate
ESP
Volume Flow rate
ESP
2700
100
2700
100
RPM
RPM
2280
2284
Fan speed (High –Ultra High)
17(27)-4-02
Fan Curve Supply
Fan Curve Return
19(29)-2-12
19(29)-3-10
Size 07
Supply
Exhaust
Volume Flow rate
ESP
Volume Flow rate
ESP
3900
100
3900
100
RPM
RPM
2143
2155
Fan speed (High –Ultra High)
17(27)-4-02
Fan Curve Supply
Fan Curve Return
19(29)-2-10
19(29)-3-08
4.11. Antifreeze Logic
4.11.1. Pro Version
This function is used to avoid plate heat exchanger freezing as it activates a sequence of actions to counteract
the risk of frost formation.
The antifreeze logic is activated whenever outdoor and exhaust temperatures fall below pre-set values and
pressure drop across the heat exchanger, monitored thanks to a pressure transducer, exceeds a pre-set
threshold for a specific time duration. Once the logic is active, the actions performed are the following:
Antifreeze
disabled
No action
Antifreeze
enabled
1) Bypass damper is gradually open up to 100% (only if heating coil present)
2) Supply airflow is gradually reduced and return airflow is gradually increased up to a
20% variation
3) Pre-heating coil is activated (if present)
4) Unit goes in alarm if the last action performed is not effective to exit freeze condition
in less than 30 min.
An auto-reset is performed after 1 hour, after which the unit starts again
automatically.

Databook Modular T - October 2022 - Rev. 00 20
4.11.2. Smart Version
In accordance with the image here below showed, adding a pre-electrical heater (ATD**HEFBU) is mandatory
for outdoor temperature lower than -5°C for either tackling or preventing frost issue.
The unit has been equipped with a differential pressure switch to prevent a possible risk of icing at heat
exchanger level. Depending on the working condition, the installer must adjust the setting according the
charts below.
Temp
Limit
Main Module
ATB*S / SB.ATB*S
10
0
-10
-5
-15
45
…
-20
Main Module
ATB*S
SB.ATB*S
Preheating electric coil
ATD*HEFBU
Outdoor Temperature (°C)