Additional Features - Siemens RDG400 Basic Documentation

Output signal inversion
Min / Max air flow
Comfort or Energy Saving mode
with Vmin >0 (P63)
Y
100%
H
Vmax
YV
Vmin
0%
wH
wC
Comf/Eco
Automatic heating /
cooling changeover
Siemens
Building Technologies
4.6

Additional features

The output signal DC 0...10V (Y10) can be inverted by means of DIP switch 4
(see section 4.7.3).
To ensure a minimum or maximum supply air volume, the output signal for the air
flow (DC 0...10 V or 3-position) can be limited to a minimum value via parameter
P63 and to a maximum value via parameter P64.
Both values can be set between 0% and 100%.
Changeover
Y10
XpH
H
100%
Vmax
Vmin
0%
W
If Vmin (P63) is set to >0, then a minimum air flow of Vmin is assured in Comfort
and Energy Saving modes.
In Protection mode, the air flow in dead zone is 0.
Example: air flow rate signal in single duct application with electrical heater:
Protection mode
with Vmin >0 (P63)
Y
100%
C
H
Vmax
Vmin
0%
TR [°C]
wH
Comf/Eco
The water temperature acquired by the changeover sensor (QAH11.1 + ARG86.3)
is used to change over from heating to cooling mode, or vice versa. When the
water temperature is above 28 °C (parameter P37), the thermostat changes over to
heating mode, and to cooling mode when below 16 °C (parameter P36).
If the water temperature is between the 2 changeover points immediately after
power-up, the thermostat starts in heating mode.
The water temperature is acquired at 30-second intervals and the operating state is
updated accordingly.
M
16 28
M Operating mode
T Water temperature
w
RDG400 Basic Documentation
Functions
T
Y10
XpC
C
w
XpH
XpC
Vmin
Vmax
TR [°C]
C
YV
wC TR [°C]
Prot
Prot
T [°C]
w
Cooling mode
Heating mode
Room temperature
Control output
Room temperature setpoint
Proportional band "Heating"
Proportional band "Cooling"
Minimum limitation air flow
Maximum limitation air flow
Protection mode (Vmin = 0)
Caution! No air flow when el.
heater is active
Y
100% H
Vmax
Vmin
0%
wH wC
Prot
C
YV
TR [°C]
Prot
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CE1P3182en
19 Jun 2009