User Manual

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Siemens Room Temperature Controllers CE1N3048en
Building Technologies 2017-11-14
The RCU15 provides control depending on the temperature acquired either by its
integrated sensor, external room sensor or return air temperature sensor
in the fan coil unit. Changeover is automatic if a QAH11.1 cable temperature sensor or
external room temperature sensor QAA32 is connected to the device.
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:
Normal operation is activated when the external operating mode changeover switch is
not activated. In normal operation, the controller maintains the adjusted setpoint.
Frost protection mode can be activated using the external operating mode changeover
switch, provided DIP switch no. 1 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 room temperature is
maintained at a setpoint of 8 °C. The setpoint adjusted by the user will be ignored.
Energy saving mode can be activated using the external operating mode changeover
switch, provided DIP switch no. 1 is set to ON
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.
A changeover switch can be connected to status input D1–GND. When the switch acti-
vates (caused by an open window, for instance), the operating mode will change from
normal operation or standby to energy saving mode (provided DIP switch no. 1 is set to
ON), or from normal operation or energy saving mode to standby (provided DIP switch
no. 1 is set to OFF).
The operating action of the switch (N.C. or N.O.) can be selected.
Ordering
When ordering, please give name and type reference, e.g. room temperature controller
RCU15.
Valve and air damper actuators 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 (not suitable for PWM mode)
SFA71...
4863
Thermal actuator (radiator valve)
STA71...
4877
Thermal actuator (small valve 2,5 mm)
STP71...
4878
Air damper actuators
GCA12…1
4613
*) The documents can be downloaded from http://siemens.com/bt/download.
Return air tem-
perature or external
room temperature
Energy saver
Normal operation
Frost protection mode
Energy saving mode
Operating mode
changeover switch