Siemens RDG20 KN Series Basic Documentation page 70

Functions
4
Additional functions
Error display
IAQ – CO control (P450,
2
P023)
a) Fan coil with integrated
damper
Fresh air from ventilation
system
YH Heating valve actuator
YC Cooling valve actuator
YHC Heating/cooling valve actuator
M1 1-speed or 3-speed fan, DC 0...10 V fan
B1 Return air temperature sensor or external room temperature
sensor (optional)
70 | 180
IAQ CO concentration, level indication:
2
EN DE FR
GOOD GUT BON
POOR OKAY OK
BAD POOR BAS
CZ DK NO
GOOD GOOD GOD
OKAY OKAY OK
POOR POOR DLIG
●
The thermostat displays "---", if the received value is ≥5000 ppm.
●
The thermostat displays "ER6", if sensor is broken.
The function shall improve the indoor air quality by increasing the volumetric air
flow.
IAQ control is only available when the thermostat is in Comfort mode. In other
operating modes, this function is disabled.
When P450 is set as 2 (T + IAQ) or 3 (T + r.h. + IAQ), IAQ control is enabled. This
function adjusts indoor air quality via damper when the measured IAQ - CO
higher than the setpoint (P023). The factory setting is 1000 ppm.
When the damper is open, the fresh air symbol
Supported use cases with IAQ control:
b) Fan coil with integrated
damper
Fresh air from outside
●
Use case a): IAQ - CO
damper
The fresh air is provided via an external ventilation system, e.g. an air handling
unit (AHU)
IT ES NL
GOOD BIEN GOED
OKAY OKAY OK
POOR BAJA LAAG
PL RO SK
GOOD BUN GOOD
OKAY OKAY OKAY
POOR SLAB POOR
c) Fan coil system
RDG2..4KN for CO
2
monitoring.
Optional: Ventilation system
for CO control
2
AHU Air handling unit
Y Damper for IAQ control
IAQ
B2 External air temperature sensor (bus)
YR Radiator valve
B3 Changeover sensor
D1 Dewpoint sensor
control in fan coil systems with integrated fresh air
2
FI HU
HYVA JO
OK OK
HEIK. GYEN
TR
IYI
ORTA
KOTU
is shown on the display.
d) Universal heating/cooling
systems.
RDG2..4KN for CO
2
monitoring.
Optional: Ventilation system
for CO control
2
A6V11545892_en--_c
is
2