SIEMENS RDF660MB Flush Mount Room Thermostat Instruction Manual

RDF660MB Flush Mount Room Thermostat

Specifications

• Model: RDF660MB
• Communication: RS485 Modbus
• Mounting: Flush-mounted
• Application: Room thermostat

Mounting Instructions
Ensure to carefully read all wiring diagrams before installation to prevent damage due to incorrect wiring.

Installation

1. Identify the mounting location for the thermostat.
2. Follow the provided wiring diagrams for correct installation.
3. Watch the installation video for assistance if needed.

Dismounting
Refer to the key and instructions for proper dismounting of the thermostat.

Commissioning

1. Contact your HVAC installer to configure settings as needed.
2. Enable features like Economy mode via parameter P02.

Operating Instructions

1. Use the buttons to change room temperature setpoints.
2. Adjust fan speed and mode by pressing the corresponding button.
3.  Change thermostat operating mode using the operating mode button.

Control Parameters Adjustment

1. Baud rate and parity settings can be adjusted by your HVAC installer.
2. Reset the power after making changes to baud rate or parity for them to take effect.
3. Control parameters can be modified during operation using the thermostat buttons or a commissioning tool via Modbus.

Frequently Asked Questions (FAQ)

1. Q: How do I recalibrate the displayed room temperature?
   A: After installation, let the device run for at least one hour, then recalibrate via parameter P05.

2. Q: Can I disable the Protection mode?
   A: Yes, you can set Protection setpoints to OFF, but be cautious as this deactivates protective heating or cooling functions.

3. Q: How can I clean the filters and address external faults?
   A: The device will remind you to clean filters and notify you about external faults. Follow the device’s instructions for cleaning and troubleshooting.

Mounting Instructions

Flush-mounted room thermostat with RS485 Modbus communications

Mounting location

Wiring diagrams

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.

Operating Instructions

Display

• 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 userselects:

• 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- 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.
   Repeat steps 2 to 3 to display and change additional parameters.
   

4. 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 s ymbols 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

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| 0| 0 = 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. +41 58 724 2424www.siemens.com/buildingtechnologies

© Siemens Switzerland Ltd, 2020
Technical specifications and availability subject to change without notice.

References

• Building technology - Siemens Global

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>