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?
Creating ow balance in a zone (consisting of several WISE
Damper) is an important part of a WISE system that is solved
with the help of so-called Ventilation groups. A zone is always
a ventilation group. Within a ventilation group, the sum of the
total supply air ow is calculated minus the total extract air
ow. The dierence is the ow that needs to be created so there
is balance in the zone. Flow balance is created with the help of
one or more extract air duct dampers (FE). 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 or constant pressure
damper that automatically becomes balancing dampers. The
ow oset is set on each product or on the zone.
The extract ow is distributed to balance the extract air damp-
ers in proportion to their air ow capacity. Extract air dampers
(FE) 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.
Conguring the damper as a constant ow damper will not take
any part of the balancing part of the extract air. However, the
damper’s ow is included in the balancing calculation.
A room can point out a specic zone damper to manage the
selected room’s extract air.
The zone damper’s extract air setpoint value is then set based
on the underlying room’s supply air, before balancing in the
zone is calculated with the help of the balancing function. These
selected dampers are not used as balancing dampers for the
balancing function.
Constant pressure damper for the extract air (PE), Optimization
extract air (OE) and Reverse Pressure regulation damper extract
air (PED*) are included in the sum of extract air, but cannot be
used to balance the ow in the zone.
Formulas to calculate the extract air ow for
balancing are:
“Extract air ow total” = “Sum Supply air ow” –
“Non-balancing extract air ow” + “Oset”
“Extract air ow to balance” = “Extract air ow total” – “Sum
min-air ow for balancing air ow”
Extract air to dedicated dampers are a part of the “Non balanc-
ing extra air ow”.
Oset is specied in l/s and/or as a percentage.
Adjustable product parameters in SuperWISE
Section Description Standard value Min. Max. Unit
Lowest user level
(read/write)
Function
Air ow Flow oset 0 l/s Local/Installation
Settings for positive or negative oset to create a little positive
or negative pressure.
Air ow Flow oset 0 -100 100 % Local/Installation
Settings for positive or negative oset to create a little positive
or negative pressure.
WISE Measure
( MS)
WISE Damper
( FS CAV)
WISE Damper
( FE CAV)
WISE Damper
( PE)
RJ12
WISE
DPS
WISE Damper
( FE )
BALANCING
CAV / VAV
ZONE
CAV / VAV
CAV / VAV
WISE Damper
(OS)
WISE Damper
(OE)
WISE Comfort Modules,
WISE Air Diffusers and
WISE Dampers
WISE Damper
( PS)
RJ12
WISE
DPS
Basic circuit diagram, Flow balancing