Databook Modular T - October 2022 - Rev. 00
27
5.2.2. Silencers
Silencers for supply and or return ducts are available for each size. The length of silencer is 600mm. They are
circular, in this way no duct transitions are needed. In the next table, there are attenuation data for each
frequency:
Material
Name
Size
Diameter
(mm)
Frequency [Hz]
63
125
250
500
1000 2000 4000 8000
Avg
dB(A)
ATS0360A
03
250
-
2
8
14
25
12
6
7
25
ATS0460A
04
315
-
2
6
12
14
9
5
5
17
ATS0560A
05
355
-
2
6
7
12
6
3
4
14
ATS0660A
06
400
-
2
4
5
10
4
3
2
12
ATS0760A
07
500
-
1
1
4
2
1
1
1
8
5.3. Accessories only for Pro version
5.3.1. Useful information
•
Both pre ATD**HEFA and post ATD**HESA electric heaters must be equipped with an additional
temperature probe (ALP00TEA) fitted in the duct and wired to the dedicated terminals.
•
Each size can be equipped with two different electric heaters: ATD0*HESAU (low capacity) or
ATD0*HEFAU (high capacity). Both of them can be installed as pre and post heating coil. Only
difference between the two coil is the maximum reachable power. Astra Web selection software,
based on specific
project’s conditions
, will automatically select the most suitable coil.
•
Post heating (ATD**HWFAU / ATD**HWSA*) and main water coil (ATD**UWSA*) do not require
additional temperature probes. In addition, either a 2- or 3-ways regulating valves (ATV**HW2A,
ATV**HW3A, ATV**CW2A, ATV**CW3A) can be ordered along with modulating actuators for water
valve (mandatory option ATE00AMVA), supplied loose for site fitting.
•
On Astra Web selection software for Modular T Pro version, the temperature probe is automatically
added (if needed) when a coil is selected.
•
On Astra Web selection software for Modular T Pro version, the modulating actuators is
automatically added when a water valve is selected.
•
The accessory compatibility might be limited on the basis of the control features and/or for the
position of the accessories. Kindly refer to your sales representative in case of doubts. Main
incompatibilities are summarised below:
-
DX coil and main Water Coil
-
Electric pre heating and water pre heating
-
Electric post heating and water post heating
-
Third filtration stage and water post heating
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