CE1B3079en / June 14, 2011 Subject to change Siemens Building Technologies
s
Operating Instructions
RDF302
RDF302 – the room thermostat with RS 485 communications, using Modbus protocol, allows you to set the ideal room
temperature you want.
The thermostat provides Comfort, Energy Saving, and Protection mode.
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
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
Automatic fan
Low fan speed
Medium fan speed
High fan speed
Buttons are locked
Operation and settings
Operating mode button
- Protection
- Comfort
- Economy
**
or in a system with manual
changeover
:
- Protection
- Comfort heating
- Comfort cooling
Colder / Warmer
Fan mode button
– Automatic fan (
)
– Manual fan (
)
* 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
setpoint 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
protection 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. Adjust parameters P11 and P12 to
change the preselected setpoints.
The thermostat can be set to Energy Saving mode either by pressing the
operating mode button if enabled (P02 = 2), or via an external signal (switch or
Modbus command) such as window contact, keycard or presence detector.
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 Modbus, 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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