CORRIGO VENTILATION 3.6 MANU

Manual Corrigo Ventilation, revision V Chapter 5 Functional description 45
Extra compensation curve
As a complement to the above outdoor compensation, there is a function called ”Extra compensation
curve pressure/flow setpoint” which can be used to set a compensation based on the room, extract air,
supply air or outdoor temperature. The curve has three parameter pairs which correspond to the value
of the compensation at three different temperatures.
Controller output-dependent extra compensation curve
The compensation is made using the control curve, one for heating demand and one for cooling
demand. It is possible to select whether the compensation (0...10000) should increase or decrease the
pressure setpoint. The 0...10000 compensation follows the current control quantity for the fans.
Regulator-
utsignal
Y1
Y2
Y3
Utsignal
0%
100%
Kompensation vid
kylbehov
Kompensation vid
värmebehov
Frequency control flow
Instead of giving a pressure setpoint value, it is possible to use an airflow volume value in m
3
/h. The
value from the pressure transmitter is recalculated to a volume flow using the formula below and the
fans will be controlled to give a constant flow.
Flow = K *∆ P
X
Where K and
X
are settable constants dependent on the fan size and ∆ P is the differential pressure,
measured in Pa, over the fan. Each fan has its own set of parameters.
X
is normally 0.5 indicating that the flow is proportional to the square root of the differential pressure.
Flow dependent filter guards
Analogue filter guards may be made air flow dependent. This means that a higher pressure drop is
permitted across a filter at a higher air flow. For this purpose, X and Y coordinates are used to set the
linear function that should be followed at a pressure drop alarm. These are found under “Alarm
settings” in E tool
©
by double clicking either in the alarm list or under “Alarm objects”. They can also
be accessed through the alarm settings in the display. FS = X1:0 m
3
/h, Y1:10 Pa : X2:2000 m
3
/h,
Y2:150 Pa.
If a constant pressure drop alarm level is wanted, Y1 and Y2 should be set to the same value. In cases
where flow control is not used, the first pressure value applies to pressure drop alarms (Y1).
Outdoor compensation
Also when running flow control, it is possible to outdoor compensate the setpoint value.
The outdoor compensation is linear and is set using two parameter pairs which give the value of the
compensation at two different outdoor temperatures. The compensation can be positive or negative.
Using E tool
©
, you can also choose to only outdoor compensate the flow of the supply air fan. In that
case, the extract air fan is controlled using constant flow, independent of the outdoor temperature.
Output signal
Cooling demand
compensation
Heating demand
compensation
Controller
output
10000
units
10000
units