Siemens RDF660MB Series User manual

Siemens Smart Infrastructure A6V12060783_en--_c A5W00123793A_AC 2022-11-24 1/2
Mounting Instructions RDF660MB..
Flush-mounted room thermostat
with RS485 Modbus
communications
Installation video Datasheet
Mounting location
Factory setting
RDF660MB
X1 3 = Window contact (DI)
X2 1 = External temperature sensor (AI)
RDF660MB/MM
B1 9 = H/C changeover (DI)
S1 3 = Window contact (DI)
Wiring diagrams
Application
2-pipe fan coil, on/off valve output with DC fan
2-pipe fan coil, on/off valve, and electric heater outputs with DC
fan
4-pipe fan coil, on/off valve outputs with DC fan
Key
N1 RDF660MB/MM, RDF660MB
M1 ECM fan
V1, V2 Valve
C1, C2 Compressor
S2 Operating mode switch-over
contact (e.g. key card)
B2 External room / return air
temperature sensor
E1 Electrical heater
2-pipe fan coil, 3-pos valve outputs with DC fan
No function
DIP
switches
Dimensions (mm)
Mounting
Carefully read all wiring diagrams
prior to installation to avoid
damage to the device caused by
incorrect wiring of high or low
voltages.
Dismounting

2/2 A6V12060783_en--_c A5W00123793A_AC 2022-11-24 Siemens Smart Infrastructure
Operating Instructions RDF660MB..
Display
Protection mode
Comfort mode
Economy 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
* Needs to be configured by your HVAC installer
** Needs to be enabled via parameter P02
Change room temperature setpoint
Press +or –buttons to increase or decrease the current room temperature setpoint for Comfort
mode. The thermostat changes to Comfort .
The setting range is 5...35 °C, unless limited by parameters P09 and P10.
Adjust fan speed/fan mode
Press the button to adjust the fan mode and fan speed.
In Auto mode , the thermostat automatically selects the fan speed based on setpoint and actual
room temperature.
In manual mode, the fan always runs at the speed that user selects:
Low fan speed
Medium fan speed
High fan speed
Change thermostat operating mode
Press operating mode button to change the operating mode display.
In Comfort mode , the thermostat maintains the room temperature at the setpoint which can be
readjusted using the + and –buttons.
In Economy mode , the room temperature is maintained at a lower or higher fixed setpoint (factory-
set: 15 °C, 30 °C) to save energy. Adjust parameters P11 and P12 to change the preselected
setpoints. The availability of Economy mode depends on parameter P02 or via an external signal
(switch or Modbus command) such as keycard or presence detector.
In Protection mode , the thermostat stops operating. However, it will operate if the room
temperature is below 8 °C (heating application) against frost (P65) and the value is adjustable.
In Protection mode, press any button to activate the screen, then press the mode button to change to
another operating mode.
Important: User can set Protection setpoints to OFF; the thermostat then is inactive, i.e. no
protective heating or cooling function. Risk of frost!
Key lock
The key symbol indicates buttons are locked.
Key lock can be configured via parameter P14.
Reminder to clean filters and for external faults
FIL *This message reminds user to clean HVAC equipment filters.
Recalibrating the sensor
After installation for at least one hour, the displayed room temperature
can be recalibrated via parameter P05.
Commissioning
User can adjust several different control parameters to adapt the
thermostat to your system and optimize control performance. User
can do this during operation either via the buttons on the thermostat
or using a commissioning tool via Modbus.
Baud rate and parity
The Baud rate can be adjusted to 9600 bps, 19200 bps (factory
setting), 38400 bps or 57600 bps. The Parity can be set to none, odd or
even (factory setting). Your HVAC installer can set them through
additional parameters.
Important:Once making any changes on the baud rate or parity,
user must reset the power before the changes take effect.
Control parameters
Proceed as follows to change the most important control parameters
1. Press the –and +buttons simultaneously for more than 6
seconds.
Release, and within 2 seconds, press +again for more than 3
seconds. "P01" is displayed.
2. Repeatedly press the +or –button to select the required
parameter.
3. Press + and – simultaneously once to enter EDIT mode. Then press
+or –button to change the value of the selected parameter and
press + and –simultaneously to save the change.
4. Repeat steps 2 to 3 to display and change additional parameters.
5. Press + or – until “End” is displayed, and then press + and –
simultaneously to exit parameter entry mode.
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).
Meaning of cooling and heating symbols when displaying on LCD:
For automatic changeover or heating only/cooling only:
-Heating valve is open
-Cooling valve is open
For manual changeover only:
-Thermostat is in heating mode
-Thermostat is in cooling mode
Parameter Description Factory setting Setting range
P01 Control sequence 2-pipe = 1 [selection: 0…3]
4-pipe = 4 [selection: 2, 4]
0 = Heating only; 1 = Cooling only; 2 = H/C changeover manual
3 = H/C Changeover auto; 4 = Heating and cooling
P02 Mode selection by user via operating mode button 3 3 = Comfort – Protection; 4 = Comfort - Economy - Protection
P04 Unit 0 0 = °C (Celsius); 1 = °F (Fahrenheit)
P05 Measured value correction (for built-in/external
sensor) 0-5 K...5 K
P06 Standard display 0 0 = Room temperature; 1 = Setpoint; 2 = Temperature value via bus
P07 Additional display information 0 0 = No display; 1 = Room temperature °C or °F; 2 = Outside temperature (via bus)
3 = Time of day (12 h) via bus; 4 = Time of day (24 h) via bus
P08 Comfort basic setpoint 21 °C 5...40 °C
P09 Minimum Comfort setpoint 5°C 5...40 °C
P10 Maximum Comfort setpoint 35 °C 5...40 °C
P11 Economy heating setpoint (WheatEco)15 °C OFF, 5 °C…WcoolEco
P12 Economy cooling setpoint (WcoolEco)30 °C OFF, WheatEco…40 °C
P13 *** Electrical heater in cooling mode 1 0 = Disabled; 1 = Enabled
P14 Key lock 00 = Unlock; 1 = Lock (all lock); 2 = Setpoint adjustable; 3 = Setpoint lock; 4 = Fan lock;
5 = Operating mode lock
All temperature settings are in increments of 0.5 °C. *** Parameter P13 is only displayed for application "2-pipe with electric heater".
Issued by
Siemens Switzerland Ltd
Smart Infrastructure
Global Headquarters
Theilerstrasse 1a
CH-6300 Zug
Tel. [phone]
www.siemens.com/buildingtechnologies
© Siemens Switzerland Ltd, 2020
Technical specifications and availability subject to change without notice.