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1. General Description
The constant duct pressure function on the Smart venti-
lation unit attempts to regulate the fan speeds to main-
tain the duct pressure at the set value. Individual setting
values for the duct pressure should be determined for
each operating mode (away, home, boost). The operat-
ing mode can be switched as normal when the constant
duct pressure function is used.
2. Planning
Select the position of the measurement tapping point
in the duct with care, so that as far as possible it repre-
sents the pressure in the entire duct system. For exam-
ple, a suitable location is close to the ventilation unit,
yet so the airflow is still uniform in the measurement
point. The measurement is based on the pressure differ-
ence, and therefore the other measurement sensor must
be positioned so it represents the air that surrounds the
duct, and where the air is stable.
3. Installation
3.1. Installation of the sensor in the duct
system
Install the pressure sensor close to the measurement
point. When measuring the (positive) pressure on the
supply air duct, connect the measuring tube to the tap-
ping on the pressure sensor (+). When measuring the
(negative) pressure on the extract air duct, connect the
measuring tube to the tapping on the pressure sensor (-).
3.2. Electric and control cables
Connect the 3-wire cable from the pressure sensor to
the ventilation unit's I/O connection according to the
wiring diagram.
NOTE! Make sure that the strain relief is arranged
for the connections according to the electrical
safety directives.
!
Important
Only a qualified electrician may make the
electrical connections.
2
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4. Commissioning
The commissioning of regulation for constant air pres-
sure is performed with a Smart control panel. Main
menu/Settings/(1234)/IO controls
IO controls
IO 1
IO 2
IO 3 (ext.)
IO 4 (ext.)
IO 5 (ext.)
Select connections that correspond to the IO-points Pa
Supply - AI / Pa Extract - AI. Example: "Pa Supply - AI"
as a function for IO 1 and "Pa Extract - AI" as a function
for IO 2.
5. Settings
The pressure setting values and airflows must be adjust-
ed for all operating modes (Home, Away, Boost), so that
the ventilation unit functions in all conditions.
NOTE! The constant duct pressure function is not
activated until you have set the values for all oper-
ating modes.
The control type for the ventilation unit is selected and
the airflow is set from the menu Main menu/settings/
(1234)/Airflow adjustments.
Airflow adjustments
Commissioning mode
Control type
Home (supply)
Home (exhaust)
Away (supply)
Away (exhaust)
Boost (supply)
Boost (exhaust)
Travelling (supply)
Max Smart boost (supply)
!
Select "Pa" as the control type of both ducts that are to
be regulated for a constant duct pressure. If the control
type is set to "Pa Supply" or "Pa Extract", the selected
duct is solely regulated for constant duct pressure and
PTH.191017
Pa Supply - AI
Pa Extract - AI
Away - DI
Emg.Stop_NO - DI
DDC control - AI
Pa
48 Pa
50 Pa
35 Pa
38 Pa
90 Pa
92 Pa
35 Pa
82 Pa
Swegon reserves the right to make changes.
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