Siemens RDG20 KN Series - Page 79

Functions
Control sequences
4
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Application mode (via
bus)
State
changeover/continuous
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
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)
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 based on
last active sequence
The diagram below shows the control output value as a function of room
temperature for heating and cooling:
Wheat = Current heating
setpoint
Wcool = Current cooling setpoint
TR = Room temperature
Heating and cooling