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CE1B3172en / 26 Nov 2009 Subject to change Siemens Building Technologies
s
Operating Instructions
RDU341
RDU341 –the room thermostat with KNX communications allows you to set the ideal room temperature. The thermostat
provides Comfort, Energy Saving, and Protection modes and can operate in Auto timer mode using a schedule provided via
bus.
You can either take advantage of the thermostat's factory settings or adjust it as needed.
Display
Protection mode
Auto Timer mode
Comfort mode **
Energy Saving mode **
Measured room temperature,
setpoints and parameters
Current time of day or additional
user information
Actual room temperature
Outdoor temperature
Fault indicator *
Condensation in the room *
Cooling demand / mode
Heating demand / mode
Electrical heater active
Extended Comfort mode *
Buttons are locked
Weekday 1…7
(1 = Monday / 7 = Sunday)
Operation and settings
Operating mode button
– Protection mode
( )
– Auto Timer mode (
)
– Comfort mode
( )**
– Energy saving mode (
) **
Colder / Warmer
Notes:
The thermostat goes back to Auto
Timer mode if a time schedule via
bus changes the operating mode.
User operations are ignored if a
time schedule via bus sets the
operating mode to protection.
When you press a button, "OFF"
flashes on the LCD.
Auto mode is not available if there
is no time schedule via bus.
* Needs to be configured by your HVAC installer
** Needs to be enabled via parameter P02
Change room temperature
+ / –
Press + or to increase or decrease the current room temperature setpoint for
Comfort mode. The thermostat changes to Comfort
. The setting range is
5...40 °C, unless limited by parameters P09 and P10.
Change thermostat operating mode
Press operating mode button
to change the operating mode display.
In protection mode, the plant stops operating. However, if the room temperature
drops below 8 °C, heating is switched on to protect the room against frost.
Your HVAC installer can change the frost protection limit and set a heat pro-
tection limit as needed:
Changes made by installer: Frost protection: ........... ˚C
Heat protection: ........... ˚C
In Comfort mode, the thermostat maintains the room temperature on the
setpoint which can be readjusted using the + and – buttons.
In Energy Saving mode, the room temperature is maintained at a lower or higher
setpoint, thus saving energy and money.
The thermostat can be set to Energy Saving mode either by pressing the ope-
rating mode button if enabled (P02 = 2), or via an external signal (switch or KNX
bus command) such as window contact, keycard or presence detector.
The energy saving setpoints are factory-set to 15 °C for heating and 30 °C for
cooling. Use parameters P11 and P12 to adjust the values.
Important: These setpoints can be set to OFF; which means that the thermostat
is not active., i.e. no protective heating or cooling function.
Risk of frost!
In Auto timer mode, the thermostat automatically switches between Comfort
and Energy Saving mode according to the scheduler via KNX bus.
Change from heating to cooling mode
/
Changeover between cooling and heating is either automatic using a heating /
cooling changeover sensor or a remote changeover switch or via instruction from
the central management station via KNX bus, or manual by pressing operating
mode button
. No changeover is possible if the thermostat is configured for
cooling only or heating only, (see parameter P01).
Display for automatic changeover or heating only / cooling only:
Heating valve is open
Cooling valve is open
Display for manual changeover:
Thermostat is in heating mode
Thermostat is in cooling mode
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