Assortment / System Description

Fan coil application
Outside air damper control
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17.29 Outside air damper control
The outside air damper primary supplies the room with fresh outside air. It can
also be used for 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.
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 outside air damper TiRupDmpOa 2 [Min]
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 characteristic curve for outside
temperature X1
X1LmOutTOa 6 [°C]
Output limitation characteristic curve for damper
position Y1
Y1LmOutDmpPos 20 [%]
Output limitation characteristic curve for outside
temperature X1
X2LmOutTOa 18 [°C]
Output limitation characteristic curve for damper
position Y2
Y2LmOutDmpPos 100 [%]
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. The switch-on point for the Economizer
can be defined by a parameter:
Description Name Default value
Minimum difference room temperature/outside
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.
The outside damper switch-on delay can be configured for fresh air demand
and cooling demand.
Description Name Default value
Cooling request switch-on delay DlyOnAirFlCReq 30 [s]
Ventilation request cooling delay DlyOnAflVntReq 30 [s]
Ramp-up time outside
air damper
Outside temperature-
dependent limitation of
outside air damper
Economizer
Switch-on delay