User Manual

Application Sheet FCU032
Fan coil unit with variable fan, heating/cooling coil (2 pipe) on triac
output and electric reheater
DXR2..09T-101A
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Technical information in this document are subject to change. Drawings serve illustration purposes only.
Siemens is not responsible for content and any manual modifications.
2019-02-21
A6V10662233_en--_d_--_02
∂ Heating with LTHW and cooling with CHW changeover
∂ Modulating control of heating and cooling valve (2 pipe) on triac output and electric reheater
∂ Automatic or manual variable fan speed control DC 0...10 V
∂ Room temperature and fan speed operation via KNX PL-Link room operator unit with temperature
measurement
Plant diagram
DXR2… Room automation station Q1 Variable speed fan
B1 Extract air temperature sensor R Room
B3 Supply air temperature sensor R1 Room operator unit with
D1 Window contact temperature sensor
D2 Presence detector YHC Heating/cooling coil valve
D4 Over-temperature detector YR Electric reheater
Function diagrams Heating/cooling valves DC 0...10 V fan
Electric reheater, 1-stage
Chovr Changeover SpH Effective heating setpoint
C Cooling sequence TR Room temperature
H Heating sequence Y Output signal
Q Fan output signal YHC Heating/cooling valve
SpC Effective cooling setpoint YR Electric reheater
SpC
0
100
Y [%] Q [%]
TR [°C]
YH
SpH
YC
100
Chovr
SpC
TR [°C]
YHC YHC
0
SpH
Y [%]
H C