Assortment / System Description

Fan coil application
Air quality control
17
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17.27 Air quality control
The fan coil unit application can be used for air quality control. It requires an
outside air damper capable of supplying the room with fresh air and an air
quality sensor in the room. The application automatically enabled air quality
control as soon as an air quality sensor and an outside damper is configured.
Air quality setpoints can be configured separately for each room operating
mode.
Description Name Default value
Room air quality setpoint for Comfort SpAQualRCmf 900 ppm
Room air quality setpoint for Pre-Comfort SpAQualRPcf 1100 ppm
Room air quality setpoint for Economy SpAQualREco 1500 ppm
Room air quality setpoint for Protection SpAQualRPrt 1500 ppm
The minimum outside air damper position can also be configured for each room
operating mode.
Description Name Default value
Minimum outside air damper position for Comfort DmpOaPosMinCmf 50 [%]
Minimum outside air damper position for Pre-
Comfort
DmpOaPosMinPcf 40 [%]
Minimum outside air damper position for Economy DmpOaPosMinEco 30 [%]
Minimum outside damper position Protection DmpOaPosMinPrt 20 [%]
17.28 Dehumidification control
The application function for fan coil applications lowers the relative humidity by
overriding the coiling coil valve position and setting the fan to the correct speed
for dehumidification. The integrated PID controller compares relative room
humidity with the setpoint corresponding to the active room operating mode.
The PID controller operating mode is set to 2-point (off/dehumidification) to
activate maximum output if the temperature for dehumidification must be
lowered.
The cooling coils are controlled with the command to dehumidify, while also
coordinating that state with the controller that the cooling coils are ready for
dehumidification.
A humidity sensor in the room is required for dehumidification control. The
application automatically enables dehumidification control as soon as an
humidity sensor and cooling coils are configured.
Dehumidification setpoints can be configured separately for each room
operating mode.
Description Name Default value
Relative room air humidity setpoint for Comfort SpHuRelRCmf 60 % r.h.
Relative room air humidity setpoint for Pre-Comfort SpHuRelRPcf 60 % r.h.
Relative room air humidity setpoint for Economy SpHuRelREco 70 % r.h.
Relative room air humidity setpoint for Protection SpHuRelRPrt 70 % r.h.
Setpoints
Minimum positions for
outside air damper
Setpoints