User Manual

Page 12 Unrestricted 0 – Siemens Smart infrastructure

(B) Desigo Room Automation

with room unit and room

sensor

Room controller DXR2..

Room unit QMX3.P74

With built-in T, CO

2, RH sensors,

connected to DXR2..

by KNX PL-Link

Optional: VOC sensor

with analog output,

AQR2547NF + AQR2530NNW

GDB181.1E/KN, or

GLB181.1E/KN

Connected to DXR2..

by KNX PL-Link

GDB181.1E/3, or

GLB181.1E/3

connected to DXR2

by DC 0/2…10 V

(not shown)

Note: control of relative humidity

via humidifier/dehumidifier

VAV control of CO

2 and VOC

• Supply and extract air control

• External flow control for VAV system with flow controller

and diff. pressure sensor

• Internal flow controller and diff. pressure sensor or velocity sensor

• Cooling coil, heating/cooling coil, heating coil

• Electric heating coil, modulating, single- or 2-stage

• Room temperature control by 2-pipe system with c/o or 4-pipe system

• Supply air temperature cascade control; air flow tracking

for under/overpressure

• Radiator and chilled/heated ceiling control

• IAQ and dehumidification control

VAV system with cooling

VAV system with heating/cooling

VAV system with electric heating coil

Note: Similar applications available for fan powered box