Siemens RDD100 Room Thermostat
INTRODUCTION
- Room temperature control
- Comfort, Economy, and Protection mode
- 2-position control with On/Off control output
- Adjustable commissioning and control parameters
- Mains-powered AC 230 V (RDD100) or battery-powered DC 3 V (RDD100.1)
Use
The RDD100.. is used to control the room temperature in heating systems.
Typical applications:
- Apartments
- Commercial spaces
- Schools
For the control of the following pieces of equipment: - Thermal valves or zone valves
- Gas or oil boilers
- Fans
- Pumps
Functions
- Room temperature control via a built-in sensor
- Selection of operating mode with operating mode touch key
- Display of current room temperature or set point in °C or °F
- Touch key lock (manually)
- Setpoint lock
- Reloading factory settings for commissioning and control parameters
Temperature control
The RDD100.. acquires the room temperature with its built-in sensor and maintains the set point by delivering control commands. The switching differential is 1 K.
- T Room temperature
- SD Switching differential
- W Room temperature setpoint
- Q14 Output signal for heating
Type summary
| Product No. | Stock No. | Features |
| RDD100 | S55770-T275 | Mains-powered AC 230 V |
| RDD100.1 | S55770-T276 | Battery-powered DC 3 V |
Ordering
- When ordering, please indicate product No. /Stock No. and description.
- Example:
| Product No. | Stock No. | Description |
| RDD100 | S55770-T275 | Room thermostat |
Valve actuators must be ordered separately.
Equipment combinations
| Description | Product No. | Data Sheet | |
| Electromotoric actuator |  |
SFA21.. | 4863 |
| Electrothermal actuator (for radiator valves) |  |
STA23.. | 4884 |
| Electrothermal actuator (for small valves 2.5 mm) |  |
STP23.. | 4884 |
| Damper actuator |  |
GDB.. | 4634 |
| Damper actuator |  |
GSD. | 4603 |
| Damper actuator |  |
GQD. | 4604 |
| Rotary damper actuator |  |
GXD. | 4622 |
| Description | Product No. | Mounting Instruction | |
| Adapter plate (for China 86 conduit box, BS4662 UK conduit box) |  |
ARG70.4 | A6V10563479 |
Mechanical design
The room thermostat consists of 2 parts:
- Plastic housing which accommodates the electronics, the operating elements, and the room temperature sensor
- Mounting plate with screw terminals
The housing engages in the mounting plate and is secured with a screw.
Operation and settings
- Operating mode touchkey
- Touch key for increasing a value
- Touch key for decreasing a value
Display
| # | Symbol | Description |
# |
Symbol | Description |
| 1 |  |
Indicating that batteries need to be replaced (only with the battery-powered version) | 6 |  |
Protection mode (protection mode icon can be enabled via parameter settings). |
| 2 |  |
Comfort mode | 7 |  |
Touch key lock activated |
| 3 |  |
Economy mode | 8 |  |
Room temperature in degrees Celsius |
| 4 |  |
Display of room temperature, setpoint, etc. | 9 |  |
Heating On |
| 5 | F |
Room temperature in degrees Fahrenheit | 10 |  |
Current room temperature |
Mounting and installation notes
Do not mount the thermostat in niches or bookshelves, not behind curtains, not above or near heat sources, and not exposed to direct solar radiation. Mount about 1.5 m above the floor.
Mounting
- Mount the thermostat in a clean and dry location without direct air flow from heating/cooling equipment, and not exposed to drip or splash water
Note: When RDD100.. is equipped with either China 86 conduit box or BS4662 UK conduit box, an ARG70.4 adapter plate is suggested to provide a better fitting installation.
Wiring See Mounting Instructions M1420 enclosed with the thermostat.
Ensure that wiring, protection, and earthing comply with local regulations- Correctly size the cables to the thermostat and the valve actuators
- Use only valve actuators rated for AC 24…230 V
Warning! No internal line protection for supply lines to external consumers. Risk of fire and injury due to short circuits! - Adapt the line diameters as per local regulations to the rated value of the installed overcurrent protection device.
- The AC 230 V mains supply line must have a circuit breaker with a rated current of no more than 10 A
- Disconnect from the power supply before removing the unit from its mounting plate
Commissioning notes
- Commissioning
After power is applied, the thermostat carries out a reset during which all LCD segments flash, indicating that the reset was made correctly. After the reset, the thermostat is ready for commissioning by qualified HVAC personnel. The control parameters of the thermostat can be set to ensure the optimum performance of the entire system. Please refer to Operating Instructions CB1B1420, section “Do you want to change parameters?”. - Sensor calibration
If the temperature on the display does not agree with the room temperature effectively measured, the temperature sensor can be recalibrated. For that purpose, adjust parameter P04. - Setpoint and setpoint lock
We recommend reviewing the setpoint range and setpoint lock (for public areas) using parameters P05…P08 and changing them as needed to achieve maximum comfort and energy savings. - Touchpad scanning rate
Since the thermostat uses touch technology and to minimize battery power consumption, a parameter P21 (adjustable from 0.25 to 1.5 seconds) is implemented for the user to adjust. This function is only valid for the battery-powered version and the default value is 1 second. This means that when, for a certain time, the user does not touch the touchpad, the unit operates in power saving mode and the touchpad is running at a scanning rate of 1 second. (From the calculation – assuming 4 operations per day on the thermostat, the estimated 1-second scanning rate results in a battery life of 1 year. If the user increases the scanning rate, the battery’s life is extended.) - Change of batteries (only with battery-powered version)
If the battery symbol appears, the batteries are almost exhausted and should be replaced. Use alkaline batteries type AAA.
Operating notes
The RDD100.. provides Comfort, Economy, and Protection mode. The difference between Comfort and Economy modes is only the room temperature setpoint. The changeover between Comfort, Economy and Protection modes is made by pressing the touch key 
.
- Comfort mode
When Comfort mode is activated, a symbolappears on the display. The setpoint (20 ºC) can be readjusted by pressing the touch keys + and –. - Economy mode
When Economy mode is activated, a symbol appears on the display. The setpoint (16 ºC) can be readjusted by pressing touch keys + and –. - Protection mode
If the temperature falls below 5 ºC, the unit automatically activates the heating output. The symbolappears only, if the icon is enabled via parameter settings.
Maintenance notes
The thermostats are maintenance-free.
Disposal
The device is considered an electronic device for disposal in terms of the European Directive 2012/19/EU and may not be disposed of as domestic garbage.
- Dispose of the device through channels provided for this purpose.
- Comply with all local and currently applicable laws and regulations.
- Dispose of empty batteries in designated collection points.
WARNING Risk of explosion due to fire or short-circuit, even if the batteries are empty Risk of injuries from by flying parts
- Do not allow the batteries to come into contact with water.
- Do not charge the batteries.
- Do not damage or destroy the batteries.
- Do not heat the batteries to more than 85 °C.
WARNING
Electrolyte leakage Chemical burns
- Only grasp damaged batteries using suitable protective gloves.
- If electrolyte comes into contact with the eyes, immediately rinse the eyes with plenty of water. Consult a doctor.
Observe the following:
- Only replace batteries with batteries of the same type and from the same manufacturer.
- Observe the polarities (+/-).
- The batteries must be new and free from damage.
- Do not mix new batteries with used batteries.
- Store, transport, and dispose of the batteries in accordance with local regulations, guidelines, and laws. Also observe information from the battery manufacturer.
Technical data
The documents can be downloaded from http://siemens.com/bt/download.
Connection diagrams
Application examples
Dimensions
All dimensions in mm
Remarks
Heating: Because of the unavoidable self-heating effects of the electrical current, loads of more than 3 Amperes connected to the unit can influence the control behavior and temperature accuracy in a negative way.
Issued by
Siemens Switzerland Ltd.
Building Technologies Division International Headquarters
Theilerstrasse 1a CH-6300 Zug
Tel. +41 58 724 2424
www.siemens.com/buildingtechnologies
Siemens Switzerland Ltd, 2013 – 2018
Technical specifications and availability are subject to change without notice.
REFERENCE:
DOWNLOAD MANUALS:
Siemens RDD100 Room Thermostat Product Specifications Guide
OTHER MANUALS:
Siemens RDD100 Room Thermostat Operating Instruction
