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ACS Operating
Heating OR cooling
Heating AND cooling
Siemens
Building Technologies
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.
With a single-duct application, 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
State changeover / conti-
mode (via bus)
nuous heating or cooling
Heating
Auto (0)
Cooling
Heat (1), (2), (8)
Heating
Cooling
Heating
Cool (3), (5)
Cooling
Night purge (4),
Heating
Fan only (9)
Cooling
With applications "Single duct with electric heater / radiator / heating / cooling coil",
the control sequence state depends on the application mode and on the heating /
cooling demand.
Application
Heating / cooling demand
Mode (via bus)
Heating
No demand
Auto (0)
Cooling
Heating
Heat (1), (2), (8)
No demand
Cooling
Heating
Cool (3), (5)
No demand
Cooling
Night purge (4),
No temperature control active
Fan only (9)
The value of the output as a function of the room temperature is shown in the
following diagram in case of a heating and cooling system:
1 = Heat
0 = Cool
100%
0
Wheat
RDU341 Basic Documentation
Wheat = current heating setpoint
TR
Wcool = current cooling setpoint
Wcool
Control sequence state
Heating
Cooling
Heating
Heating
Cooling
Cooling
Heating
Cooling
Control sequence state
Heating
Heating / cooling depending
on last active sequence
Cooling
Heating
Heating
Heating
Cooling
Cooling
Cooling
Heating / cooling depending
on last active sequence
CE1P3172en
2015-06-08
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