User Manual

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 value of the control output as a function of the room temperature is illustrated
in the following diagram for a heating and cooling system:
Wheat = current heating setpoint
Wcool = current cooling setpoint
TR = room temperature
Heating and cooling