The outside air damper primary supplies the room with fresh outside air. It can also be used to take advantage of cooler outside air to cool the room.

The outside air damper is only opened if the fan is running. This can be based on a cooling request, dehumidification request, or fresh air request.

Ramp-up time for outside air damper

A configured limit prevents the damper from opening too quickly is the air is very cool. Closing and manual commanded are not prevented.

The ramp-up function is enabled if the outside temperature is below the switch-on point for the ramp-up damper or the outside temperature sensor is invalid.

Description

Name

Default value

Switch-on point for ramp-up function

SwiOnPtRup

5 [°C]

Ramp-up time for outside air damper

TiRupDmpOa

2 [Min]

Outside air temperature
-dependent limitation of outside air damper

The characteristic curve for the outside air damper can be limited by the outside temperature. The value can be adapted regardless of internal room load.

Description

Name

Default value

Output limitation characteristics for outside air temperature X1

X1LmOutTOa

6 [°C]

Output limitation characteristics for damper position Y1

Y1LmOutDmpPos

20 [%]

Output limitation characteristics for outside air temperature X1

X2LmOutTOa

18 [°C]

Output limitation characteristics for damper position Y2

Y2LmOutDmpPos

100 [%]

Economizer

The Economizer function can be activated if the outside air is cold enough for cooling. The temperature of the outside air is distributed via the weather station central function to all rooms or measured locally. The switch-on point for the Economizer can be defined by a parameter:

Description

Name

Default value

Minimum difference room temperature/outside air temperature for cooling

DiffTRTOaMinC

0 [K]

The Economizer is disabled and the outside damper is moved to the minimum position if dehumidification uses the application. This dehumidifies more humid air from the zone through the coiling coils.

Mixed air temperature
control

In the event a mixed air temperature sensor is configured, the mixed air temperature is controlled for room cooling to the mixed air temperature setpoint. The mixed air temperature setpoint can be defined by a parameter.

Description

Name

Default value

Mixed air temperature setpoint for cooling

SpTMxC

12 [°C]

Switch-on delay

The outside damper switch-on delay can be configured for fresh air demand and cooling demand.

Description

Name

Default value

Switch-on delay for air volume flow cooling request

DlyOnAirFlCReq

30 [s]

Switch-on delay for air volume flow ventilation request

DlyOnAflVntReq

30 [s]