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Siemens Room temperature controller CE1N3023en
Building Technologies 2017-11-14
The room temperature setpoint can be limited in increments of 1 K by making use of
the minimum and maximum limitation facility. Arbitrary setpoint readjustments can thus
be prevented.
Operating modes
The following operating modes are available:
Heating or cooling mode with automatic changeover and with manually selected fan
speed III, II or I. In normal operation, the controller maintains the adjusted setpoint in
heating mode and, in cooling mode, a temperature level represented by the setpoint
plus the dead zone.
The frost protection function is activated only when DIP switch no.4 is set to OFF.
Frost protection mode can be activated either
∂ by manually switching to standby
∂ by activating the external operating mode changeover switch, provided DIP switch
no.2 is set to OFF
If the room temperature falls below 8 °C, the controller will automatically switch to frost
protection mode. In that case, the heating valve opens and the fan operates at the se-
lected speed. If the operating mode selector is in position standby , the fan will oper-
ate at speed I. The room temperature is maintained at a setpoint of 8 °C and the set-
point adjusted by the user will be ignored.
If frost protection mode is locked (DIP switch no.4 in position ON), standby is locked
also, which means that the controller will not switch to standby but to OFF.
In energy saving mode, the setpoint of heating is 16 °C and the setpoint of cooling
28 °C, independent of the position of the setpoint knob. This operating mode will be
activated when input D1 for operating mode changeover is active and DIP switch no.2
is set to ON.
A changeover switch can be connected to status input D1-GND. When the switch
closes its contact (caused by an open window, for instance), the operating mode will
change from normal operation to energy saving mode (provided DIP switch no.2 is set
to ON), or from normal operation to standby (provided DIP switch no.2 is set to OFF). If
the room temperature falls below 8 °C and if DIP switch no.4 is set to OFF, frost protec-
tion mode will become active.
The operating action of the switch (N.C. or N.O.) can be selected.
Ordering
When ordering, please give name and type reference.
The QAH11.1 temperature sensor (used as a return air temperature sensor) and zone
valves are to be ordered as separate items.
Equipment combinations
Type of unit Type reference Data sheet
*)
Temperature sensor
QAH11.1
1840
Room sensor
QAA32
1747
Motoric on/off actuator
SFA21...
4863
Thermal actuator (for radiator valve)
STA21...
4893
Thermal actuator (for small valve 2,5 mm)
STP21...
4878
*) The documents can be downloaded from http://siemens.com/bt/download.
Energy saver
Normal operation
Frost protection mode
Energy saving mode
Operating mode
changeover switch
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