CE1B3
076.2
en / 2
5 Feb
20
10
Subject to change
Siemens Building Technologies
s
Operating Instructions
RDF400...
RDF400... – the room thermostat that allows you to set the ideal room temperature.
The thermostat provides Comfort, Energy Saving, and Protection mode and can operate in Auto timer mode using
8 programmable time schedules.
The fan operates either in Auto mode or at a speed selected in Manual mode.
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
Actual room temperature
Fault indicator *
Condensation in the room *
Cooling demand / mode
Heating demand / mode
Electrical heater active
Automatic
fan
Low fan speed
Medium fan speed
High fan speed
Buttons are locked
Weekday 1…7
(1 = Monday / 7 = Sunday)
Operation
an
d settin
gs
Operating mode button
**
**
View and set
Auto-Timer-Programm
Protection mode / system ON
Colder / Warmer
Fan mode button
– Automatic fan (
)
– Manual fan (
)
Set time of day and weekday
Confirm settings
* 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.
Adjust fan speed / fan mode
Press the button until you reach the desired fan mode.
In Auto mode, the thermostat automatically selects the fan speed based on set-
point and actual room temperature. The fan continues to run at low speed
(factory setting) after the room temperature reaches the setpoint .
In manual mode, the fan always runs at the speed that you select:
Low fan speed
Medium fan speed
High fan speed
For a
single-speed fan
, you can change the mode between
and
.
Change thermostat operating
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 set-
point 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.
Adjust parameters P11 and P12 to change the preselected setpoints.
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) such
as window contact, keycard or presence detector.
In Auto timer mode, the thermostat automatically switches between Comfort
and Energy Saving mode according to the time schedule.
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
manual
by
pressing the 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
