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Siemens
Room Temperature Controllers
N3057en
Building Technologies
2014-10-28
When external operating mode changeover is activated, the controller switches to
Economy (Energy saving)
mode. In this operating mode, the relevant setpoints of
heating or cooling are maintained. These setpoints can be adjusted via control
parameters P01 and P02. The default fan speed in Economy (Energy saving)
mode is
automatic fan.
When the controller is in Protection (Standby) mode , the relevant setpoints of
heating or cooling are maintained. These setpoints can be adjusted via control
parameters P03 and P04. Factory setting of both setpoints is OFF, which means that
the controller is not activated when in Protection (Standby) mode.
To avoid damage due to moisture in very warm and humid climatic zones resulting from
lack of air circulation in Economy (Energy saving)
mode, the fan can be kept running all
the time (e.g. in hotel rooms during unoccupied periods), when setting parameter P20
to “ON in dead zone”. In this case, the fan keeps running at minimum fan speed 1.
Control sequences
Used in conjunction with a valve, either for heating / cooling with changeover, heating
only or cooling only.
Used in conjunction with a 1-stage compressor for cooling only or heating only.
Heating mode
Cooling mode
T[°C]
Room temperature
SDH
Switching differential “Heating”
W
Room temperature setpoint
SDC
Switching differential “Cooling”
Y11
Control output “Valve” or “Compressor”
The valve or compressor receives the
OPEN
command via control output Y11 when
1. the acquired room temperature lies by half the switching differential below the
setpoint (heating mode) or above the setpoint (cooling mode), and
2. control output Y11 was not energized for more than the “Minimum output off time”
(factory setting 1 minute, adjustable via parameter P16)
The valve or compressor receives the
CLOSE
command via control output Y11 when
1. the acquired room temperature lies by half the switching differential above the
setpoint (heating mode) or below the setpoint (cooling mode), and
2. control output Y11 was energized for more than the “Minimum output on time”;
(factory setting 1 minute, adjustable by parameter P15)
Control output Y12 delivers a control command which is inverted to the control
command at output Y11 and which can be used for normally open valves.
With the RDF110, the changeover between cooling and heating takes place either
automatically via a heating / cooling changeover sensor or a remote changeover
switch. If the controller was set to ”Cooling only” or ”Heating only”, changeover will not
be possible (parameter P22, factory setting ”Cooling only”).
Economy (Energy
saving) mode
(only with RDF110 and
RDF110/IR)
Protection (Standby)
Avoiding damage
due to moisture
(only with RDF110
and RDF110/IR)
Water-based fan coil
application
Compressor-based
application
ON
OFF
Note:
Heating / cooling
mode
