SIEMENS RDS120-B Smart Thermostat
Smart Thermostat
RDS120-B Submittal Sheet
Advanced cloud connected thermostat for light commercial and residential applications
- Bacnet over IP Certified
- Controls conventional HVAC systems up to 3H/2C and heat pumps up to 4H/2C
- Easy-to-read, backlit, auto-dimming 3.5-inch, color, LCD touchscreen
- Intuitive remote user control using Apple iOS and Android mobile phone applications
- One-touch green leaf button to maximize energy efficiency
- Built-in Volatile Organic Compounds (VOC) sensor enables ventilation strategies for optimum indoor air quality
- Built-in humidity sensor
- Built-in occupancy sensor enables occupancy control
- Easy-to-program user schedule
Thermostat Highlights
- Easy to understand tri-level air quality indication: “Good”, “Okay”, “Poor”
- Inputs for remote or averaging temperature and humidity sensors
- Password protected screen lock
- PID algorithm for precise control
- Advanced energy saving control with free cooling capability
- Two multifunctional inputs, optional and configurable for:
- Room temperature
- Operating mode switch
- Window / door contact
- Outside air temperature
- Room air humidity
- Presence detector
- Room air quality
- Six relay outputs for:
- Conventional systems up to 3H/2C
- Heat pumps with up to 2 compressors and 2 stages of auxiliary heat
- Humidity or ventilation control
- Guided Setup Wizard
- Green Leaf button engages occupants in maximizing system efficiency. If the scheduled setpoint is overridden, the green leaf turns red. One touch returns the system to the programmed setpoint and the leaf returns to green.
Mobile App Features
- Support iOS and Android smartphones
- Full 7-day programmable schedule with three modes:
- “Comfort”: comfort settings during occupied periods
- “Economy”: setting for transition between “Unoccupied” and “Comfort”
- “Unoccupied”: setting for periods during absence to maximize energy savings
- Duplicates thermostat HMI on smartphone screen
- User account management
- Monitor room conditions
- Data security with Siemens Cloud Computing Platform
Ordering Information
| Model Number | Orderable Part Number | Description |
| RDS120-B | RDS120-B | Room Thermostat |
Associated Equipment
| Part Number | Description |
| QAA2330.EWNN | Remote Wall Mounted Sensor – Temperature Only |
| QFA33SS.EWNN | Remote Wall Mounted Temperature and Humidity Sensor |
| QAM2030.010 | Duct Mounted Temperature Sensor |
| QFM2160U | Duct Mounted Temperature and Humidity Sensor |
| QPA2000 | Wall Mounted CO2 Sensor |
| QPA2062 | Wall Mounted Temperature + Humidity + CO2 Sensor |
| QPM2162 | Duct Mounted Temperature + Humidity + CO2 Sensor |
| QAC2030 | Outdoor Air Temperature Sensor |
| QAD2030 | Surface Mount Pipe Temperature Sensor |
Technical data
Power Supply
| Power Supply | |
| Operating voltage | 24 Vac (±20%) |
| Frequency | 48 to 63 Hz |
| Power consumption | Max. 9 VA |
| Maximum power supply current | 4A current limited |
| Radio Parameter | |
| Frequency band | 2.4 to 2.4835 GHz |
| Maximum radio-frequency power | 18 dBm |
| WLAN standard | IEEE 802.11b/g/n (HT20) |
| WLAN channel | 1-11 |
Inputs
| Connections to Multifunctional Inputs X1 – M – X2 | |
| Passive temperature sensors | |
| – Cable length max. (copper cable | 300 ft (90 m) (16 AWG wire), 230 ft (70 m) (18 AWG wire) |
| section) – NTC type | 200 ft (60 m) (18 AWG wire), 130 ft (40 m) (20 AWG wire) |
| – Ni type | NTC10K Type 2 Thermistor |
| – Pt type | Ni1000 at 32°F (0°C) RTD |
| Pt1000_375/Pt1000_385 at 32°F (0°C) RTD | |
| Connections to Multifunctional Inputs X1 – M – X2 | |
| Active DC 0 V to 10 V sensors | NOTE: min./max. configurable via parameters |
| – Room temperature range (default) | 32°F to 122°F (0 to 50°C) |
| – Outdoor temperature range (default) | -32°F to 176°F (-50 to 80°C) |
| – Humidity range (default) | 0 to 100% |
| – CO2 range (default) | 0 to 2000 ppm |
| Digital contacts | |
| – Operating action | Selectable N.O./N.C. |
| – Contact sensing | DC 14 to 40 V, 8 mA (typical) |
| – Parallel connection | Max. 20 thermostats per switch |
| – Input function | Selectable |
Outputs
| Relay Contact Capacity | |
| Voltage | 24 Vac (±20%) |
| Current | Min. 0.02 A, Max. 1A per output |
Operational Data
Setpoint Range
- 45°F to 95°F (7°C to 35°C)
| Built-in Room Temperature Sensor | ||
| Temperature range | Accuracy at 77°F (25 ℃) | Display resolution |
| 32°F to 122°F | ±0.9°F or 0.5℃ | 1°F (0.5℃) |
| Built-in Room Humidity Sensor | ||
| Humidity range | Accuracy at 77°F (25°F) | Display resolution |
| 0% to 100% | ± 5% r.h. | 1% |
Connections
| Interfaces | |
| Micro USB | A service port is provided for firmware upgrade |
| Wiring Connections | |
| Screw terminals | Solid wires or prepared stranded wires: Max. 1 × 16 to 20 AWG |
| Standards, Directives and Approvals | |
| BTL | BACnet Testing Laboratory |
| RCM conformity | A5W90002477* |
| FCC standards | FCC CFR 47 Part 15 Subpart C |
| IC standards | RSS-247 issue 1 May 2015, RSS-GEN issue 4 November 2014 |
| UL | UL916 |
| Environmental compatibility | The product environmental declaration A5W90003412* (RoHS compliance, materials composition, packaging, environmental benefit, disposal). |
* The documents can be downloaded from http://siemens.com/bt/download.
General Data
| General | ||
| Dimension | H 3.58” × W 3.58” × D 1.02” | |
| Weight | Thermostat with package, user document and accessory | 15.3 oz (435 g) |
| Thermostat | 9.5 oz (268 g) | |
Issued by
Siemens Industry, Inc. Smart Infrastructure 1000 Deerfield Pkwy Buffalo Grove IL 60089 Tel. +1 847-215-1000
© Siemens Industry, Inc., 2019
Technical specifications and availability subject to change without notice.
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