Siemens RDG20 KN Series Basic Documentation page 77

Heating and cooling
A6V11545892_en--_c
Application mode (via
bus)
Auto (0)
Heat (1), (2), (8)
Cool (3), (5)
Night purge (4),
Fan only (9)
With a 4-pipe, 2-pipe with electric heater, and 2-pipe with radiator application, the
control sequence state is based on the application mode and heating/cooling
demand.
Application mode (via
bus)
Auto (0)
Heat (1), (2), (8)
Cool (3), (5)
Night purge (4),
Fan only (9)
The diagram below shows the control output value as a function of room
temperature for heating and cooling:
State
changeover/continuous
heating or cooling
Heating
Cooling
Heating
Cooling
Heating
Cooling
Heating
Cooling
Heating/cooling demand Control sequence state
Heating
No demand
Cooling
Heating
No demand
Cooling
Heating
No demand
Cooling
No temperature control
active
Wheat = Current heating
setpoint
Wcool = Current cooling setpoint
TR
Functions
4
Control sequences
Control sequence state
(ACS diagnostic value)
Heating
Cooling
Heating
Heating
Cooling
Cooling
Heating
Cooling
(ACS diagnostic value)
Heating
Heating/cooling
depending on last active
sequence
Cooling
Heating
Heating
Heating
Cooling
Cooling
Cooling
Heating/cooling based on
last active sequence
= Room temperature
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