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Siemens RDG400 Basic Documentation CE1P3182en
Building Technologies 2015-05-20
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%.
T Room temperature
Y10 Control output
w Room temperature setpoint
XpH Proportional band "Heating"
XpC Proportional band "Cooling"
Vmin Minimum limitation air flow
Vmax Maximum limitation air flow
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:
Comfort or Economy mode with
Vmin >0 (P63)
Protection mode
with Vmin >0 (P63)
Protection mode (Vmin = 0)
Caution! No air flow when electric
heater is active
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 Cooling mode
T
w
Water temperature Heating mode
Min/Max air flow
Automatic
heating/cooling
changeover
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