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Siemens
RDG400KN,RGD405KN Basic documentation
CE1P3192en
Building Technologies
2017-02-17
The state (heating or cooling) of the thermostat can be monitored with the ACS tool
(diagnostic value "Control sequence"). The last active mode is displayed when the
thermostat is in the dead zone or temperature control is disabled.
On single-duct applications, the control sequence state is determined by the
application mode (see section 3.6.2) and by the state of the heating/cooling
changeover signal (via local sensor or bus), or fixed according to the selected
control sequence (P01 = heating (0)/cooling (1)).
Application
mode (via bus)
State changeover/conti-
nuous heating or cooling
Control sequence state
(ACS diagnostic value)
Auto (0)
Heating
Heating
Cooling
Cooling
Heat (1), (2), (8)
Heating
Heating
Cooling
Heating
Cool (3), (5)
Heating
Cooling
Cooling
Cooling
Night purge (4),
Fan only (9)
Heating
Heating
Cooling
Cooling
On applications "Single-duct with electric heater/radiator/heating/cooling coil", the
control sequence state depends on the application mode and the heating/cooling
demand.
Application
mode (via bus)
Heating/cooling demand
Control sequence state
(ACS diagnostic value)
Auto (0)
Heating
Heating
No demand
Heating/cooling depending
on last active sequence
Cooling
Cooling
Heat (1), (2), (8)
Heating
Heating
No demand
Heating
Cooling
Heating
Cool (3), (5)
Heating
Cooling
No demand
Cooling
Cooling
Cooling
Night purge (4),
Fan only (9)
No temperature control active Heating/cooling depending
on last active sequence
3.6.4 Minimum and maximum air volume
The factory setting for minimum and maximum air volume is 0/100% respectively.
These values can be changed via P63/P64. Alternatively, Vmin and Vmax can be
set directly on the VAV compact controller (G..B181.E/KN).
If Vmin is greater than 0, a minimum air flow Vmin is ensured in both Comfort and
Economy mode.
In Protection mode (or Economy with setpoint = OFF), Vmin is fixed to 0.
Comfort or Economy mode
Protection mode: Vmin always = 0
ACS
Heating OR cooling
Heating AND cooling
KNX
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