Additional Features - Siemens RDG400 Basic Manual

Output signal inversion
Min/Max air flow
Comfort or Economy mode with
Vmin >0 (P63)
Automatic
heating/cooling
changeover
Siemens
Building Technologies
4.6

Additional features

The output signal DC 0...10 V (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%.
If Vmin (P63) is set to >0, then a minimum air flow of Vmin is assured in Comfort
and Economy modes.
In Protection mode, the air flow in dead zone is 0.
Example: air flow rate signal in single duct application with electric heater:
Protection mode
with Vmin >0 (P63)
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 (82 °F) (P37), the thermostat changes over to
heating mode, and to cooling mode when below 16 °C (61 °F) (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 Operating mode
T Water temperature
w
RDG400 Basic Documentation
T
Y10
w
XpH
XpC
Vmin
Vmax
Protection mode (Vmin = 0)
Caution! No air flow when electric
heater is active
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
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