Swegon WISE - Flow Balance

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WISE User Manual
Flow balance
Why regulate the ow balance?
In order to avoid negative or positive pressure and the problems
that these can cause such as noise and diculties to open/close
doors and windows.
How is ow balance regulated?
Within a room, the sum of the total supply air ow is always
calculated minus the total extract air ow. The dierence is the
ow that needs to be created to create balance in the room. The
ow balance is created with the help of one or more extract air
dampers in the room. It is possible to add a positive or negative
oset to the ow balance to create a little positive or negative
pressure.
The ow balance is regulated through the extract air damp-
ers that are not a constant ow damper that automatically
becomes a balancing damper. However, the damper with
constant ow is included in the balancing calculation.
The extract ow is distributed to balance the extract air damp-
ers in proportion to their air ow capacity. Extract air dampers
are used as balancing dampers. A damper’s share of the total
extract air ow is determined by its ow range (max-min). A
damper’s air ow cannot be lower than its minimum air ow
setting.
Balance with external air ow (not
controlled by WISE)
On a room level even external air ows can be balanced against
the WISE system, for example, from fume hoods or kitchen
hoods.
Balancing can be performed in two dierent ways, either via
ow measurement with WISE Measure or via a digital indication
to the WISE system. It is also possible to set whether the air ow
is to be balanced by changing the supply air or extract air ows.
As standard the system is set to balance with extract air ows,
which means that the reported external air ow will be applied
to the extract air in the balance calculations. If the user sets
balancing to occur with supply air ow, the equivalent ows
will be applied to the supply air instead. This mode is primarily
intended for products in rooms where there are no extract air
products.
For ow measurement using WISE Measure the measured air
is balanced continuously against other extract air dampers in
the room, if these are installed and balancing with extract air
is selected. If balancing with supply air is chosen instead, the
measured air ow will instead be continuously balanced through
the supply air products increasing the ow corresponding to the
measured ow.
For digital indication, the ow is balanced as a xed oset
against other extract air or supply air in the room, depending on
which is selected.
The function for balancing external air ow is enabled from
the Super WISE interface, where Oset balancing mode is also
adjustable under Air ow to Extract air or Supply air.
Formulas to calculate the extract air ow to
balance are:
“Extract air ow total” = “Sum Supply air ow” – “Non-bal-
ancing extract air ow” + “Oset”
“Extract air ow to balance” = “Extract air ow total” – “Sum
min-air ow for balancing air ow”
Oset is specied in l/s or as a percentage.
Adjustable room parameters in SuperWISE
Section Description Standard value Min. Max. Unit
Lowest user level
(read/write)
Function
Air ow Oset* 0 l/s Local/Installation
Settings for positive or negative oset to create a little
positive or negative pressure.
Air ow Oset* 0 -100 100 % Local/Installation
Settings for positive or negative oset to create a little
positive or negative pressure.
Air ow** Oset boosted air ow* 0 -9999 9999 l/s Local/Installation Set oset ow.
Air ow Air ow, max - 0 9999 l/s Local/Installation
Specify max ow for the room. The max ow is
automatically distributed across the products in the room.
*Only works if there are extract air products in the room.
**On each product with an oset function.