SIEMENS RDB160BNU Fan Coil Unit Room Thermostat with BACnet MS/TP Communication Instruction Manual
- June 9, 2024
- SIEMENS
Table of Contents
SIEMENS RDB160BNU Fan Coil Unit Room Thermostat with BACnet MS/TP
Communication
The RDB160BNU controls fan coil units with the following features:
- HVAC applications : 2-pipe, 2-pipe with electric heater, and 4-pipe
- Communication: BACnet MS/TP
- Operating voltage : AC 24 V
- Fan : 1, 2, 3-speed or DC 0…10 V (automatic or manual)
- Valve actuators : On/off, 3-position or DC…10 V
- Electric heater : On/off
- Built-in temperature sensor
- Three configurable inputs for external room/return air temperature, supply air temperature limitation, heating/cooling changeover, window contact, and occupancy sensor.
- Operating modes : Comfort, Standby (Economy), OFF, and mold protection
- Room temperature control: Based on built-in temperature sensor or room/return air temperature
- Heating/cooling changeover : manual, or automatic via water temperature sensor or digital input
- Supply air temperature limitation
- Automatic valve exercise
- Backlit LCD
Use
The RDB160BNU is suitable for commercial applications where communication to a building management system is required, such as offices, healthcare, education, retail, shopping malls or other commercial facilities.
Functions
Temperature control
- Built-in temperature sensor or
- External room/return air temperature
Operating modes
- Comfort
- Standby (Economy)
- OFF mode
- Mold protection (optional in OFF mode)
Additional functions
- Heating/cooling changeover
- Manual : via thermostat (P02) or BACnet object
- Automatic : via water temperature sensor or digital input
- Supply air temperature limitation function
Security functions
- Lock buttons
- Lock parameter menu access
- Block device during fire alarms
- Valve exercising feature
Energy efficiency functions
- Setpoint limitation
- Window state
- Occupancy
Fan operation
- Automatic and manual modes
- Fan operation in dead zone (fan kick)
- Fan over-run for electric heater
Fan blocking functions
- Block fan speed control in Auto mode
- Block fan speed control in Manual mode
BACnet MS/TP communication
- BACnet MS/TP MAC address : set from 0 to 127. Factory setting is 127.
- BACnet MS/TP device instance number : set from 0 to 4194302. Factory setting is 0.
- Baud rate: selectable between 9600, 19200, 38400 and 76800 (default setting) bps.
Applications
HVAC applications
The RDB160BNU can control fan coil units of the following types:
- 2-pipe system
- 2-pipe system with electric heater
- 4-pipe system
The applications can be configured using the local parameter menu or via BACnet objects
YHC | Heating/cooling valve actuator | M1 | Fan |
---|---|---|---|
YH | Heating valve actuator | B1 | Return air temperature sensor or external room |
temperature sensor (optional)
YC| Cooling valve actuator| B2| Changeover sensor (optional)
YE| Electric heater| |
Control applications
The RDB160BNU can control 29 different FCU control applications with up to 2
DC 0…10 V control outputs i.e., the control of a DC fan, DC cooling valve, and
DC heating valve is not possible.
2-pipe | 2-pipe with electric heater | 4-pipe | |
---|---|---|---|
Fan | 1/2/3-speed | DC 0…10 V | 1/2/3-speed |
Output #1 | On/Off, PWM, 3-position, DC 0…10 V | On/Off, PWM, DC 0…10 V | On/Off, |
PWM,
DC 0…10 V
| On/Off, PWM| DC 0…10 V
Output #2| N/A| On/Off| On/Off, PWM
Mechanical design
The RDB160BNU consists of 3 parts:
- Mounting plate with screw terminals
- Plastic housing with electronics, buttons, display, and room temperature sensor
- Frame
Buttons
- On/Off
- Up/down
- Fan
Display
- AUTO/MANˈ : Automatic or manual mode indication for the fan
- Current fan speed (Low, Medium, High)
- Up/Down buttons to adjust setpoints and parameters
- Occupancy indication
- Current room temperature or setpoint in °F or °C (one decimal point)
- Open window
- ˈCOOL/HEATˈ: Shows the current control mode
- ˈSTANDBYˈ: Economy mode indication ˈSERVICEˈ: Commissioning mode (setting parameters)
- ˈOFFˈ: OFF mode
- Indoor / outdoor temperature
- Setpoint temperature
- Fan status
Type summary
Type | Order number | Designation |
---|---|---|
RDB160BNU | S55770-T437 | RDB160BNU BACnet FCU Room Thermostat |
Equipment combinations
The thermostat can be combined with sensors and actuators with compatible
signal types as listed in chapter ‘Technical data’.
Product documentation
Topic | Document ID: |
---|---|
Installation instructions | A6V12045441 |
Commissioning instructions | A6V12045450 |
The Installation instructions document is available in English, Spanish, and French. It is included with the thermostat in the same packaging box. Related documents such as environmental declarations, CE declarations, etc., can also be downloaded at the following Internet address: www.siemens.com/bt/download The BTL listing can be found at https://www.bacnetinternational.net/btl/.
Safety
CAUTION
National safety regulations
Failure to comply with national safety regulations may result in personal injury and property damage. Observe national provisions and comply with the appropriate safety regulations.
Mounting
- The thermostat is suitable for mounting directly on the wall or on a 4” x 4” conduit box (using the ARG70 adapter plate).
- Recommended height: 1.5 m above the floor.
- Do not mount the devices in recesses, shelves, behind curtains or doors, or above or near heat sources.
- Avoid direct solar radiation and drafts.
- Seal the conduit box or the installation tube if any, as air currents can affect sensor readings.
- Adhere to allowed ambient conditions.
Installation
WARNING
No internal line protection for supply lines to external consumers Risk of
fire and injury due to short-circuits
- The AC 24 V mains supply line must have an external circuit breaker with a rated current of no more than 10 A.
- Adapt the supply line cable diameters as per local regulations to the rated value of the installed over-current protection device.
- Disconnect the thermostat from the power supply before removing it from the mounting plate.
WARNING
Relay outputs (DO1, DO2, DO3, DO4 or UO1) connected to mains voltage Injuries
caused by electric shock when touching the device
- Adapt the relay cable diameters as per local regulations to the rated value of the installed over-current protection device.
- Use only valve actuators rated for AC 24 V.
Commissioning
The RDB160BNU thermostat is delivered with pre-programmed control sequences.
The relevant application and its parameters can be selected using the buttons
on the thermostat. This can be done through:
- Setup Wizard : Only appears the first time the thermostat is powered on. It enables rapid system configuration of the most important parameters. For a list of these parameters, please refer to the installation instructions. See chapter ‘Product documentation [▶ 6]’.
- Parameter Menu : Available anytime. Used to access and change the complete parameter set. For a list of these parameters, please refer to the commissioning instructions. See chapter ‘Product documentation
Disposal
The symbol with the crossed-out waste container means that electrical and
electronic products and batteries may not be disposed of in normal household
waste. They must be placed in separate collection and recycling containers
according to the applicable laws. Please also refer to any applicable national
labelling requirements. Proper disposal helps save valuable resources and
prevents potentially harmful effects to people and the environment. Spent
batteries and accumulators that can be removed from old devices for disposal,
must be removed and placed in the indicated disposal channels. You are
responsible for deleting any personal data from old devices for disposal. The
registered manufacturers or distributors of electrical and electronic devices
have established a common system for returning old devices. Suppliers of
electrical devices must accept the returned devices at no charge. You can
return old devices to the original sales location or to recycling or
collection centers for old electrical devices. Please contact your regional or
municipal offices/authorities for information on recycling centers or
collection centers for old electrical devices
Warranty
Technical data on specific applications are valid only together with Siemens products listed under “Equipment combinations”. Siemens rejects any and all warranties in the event that third-party products are used.
Technical data
General
Operating voltage| AC 18…30 V
Frequency| 50…60 Hz
Power consumption| 2.5 VA
No internal fuse!
External preliminary protection with max. C 10 circuit breaker required in all cases.
Ambient conditions, environmental conditions
Ambient temperature| 32…122 °F (0…50 °C)
Storage temperature| -4…+158 °F (-20…+70 °C)
Ambient humidity| Max. 90%
Communication
Communication| BACnet MS/TP
Communication speed| 9600, 19200, 38400 or 76800 bps
Inputs
Analog input (AI1)| PT1000-sensor, 32…122 °F (0…50 °C)
Universal input (UI1)| ● Analog input: PT1000 sensor, 32…212 °F (0…100 °C)
● Digital input: potential-free contact
Digital input (DI1)| Potential free contact
Common (‘C’) power output (for UI1 and DI1 only)| DC 24 V, max. 10 mA, short
circuit-protected
Outputs
Digital outputs (Dox)| AC 24 V, max. 0.5 A
Do NOT connect fans in parallel.
Connect one fan directly.
For additional fans, install one relay for each speed.
Universal outputs (UOx)| ● Digital output (DO): AC 24 V, max. 2.0 A
● Analog output (AO): DC 0…10 V, max. 5 mA
Operational data
Built-in temperature sensor
Technology| NTC linearized 15 kΏ
Measuring range| 32…122 °F (0…50 °C)
Accuracy| ±0.9 °F (±0.5 °C) at 59…86 °F (15…30 °C)
Setpoint range| 41…95 °F (5…35 °C)
Standards and directives
UL certificates| UL916 )
BACnet BTL Listing| BACnet Application Specific Controller (B-ASC)
EU conformity (CE)| See EU declaration of conformity )
UK conformity (UKCA)| See UK declaration of conformity )
The product environmental declaration contains data on environmentally
compatible product design and assessments (RoHS compliance, materials
composition, packaging, environmental benefit, disposal)| See product
environmental declaration )
General
Mounting| Indoor, wall (directly, or on a 4” x 4” conduit box using the ARG70
adapter plate).
Terminal blocks| Lift type for max. cable cross-section:
2.1 mm2
Display| Backlit LCD
Casing material| Polycarbonate, PC
Color| Signal white RAL 9003
Safety class| IP20
Net weight| 3.88 ounces (110 g)
The documents can be downloaded at http://siemens.com/bt/download
Connection terminals
No. | Label | Description |
---|---|---|
10 | G | Supply voltage (AC 24 V~) |
11 | G0 | Supply voltage (AC 24 V⏊) |
12 | DO1 | D igital O utput 1 (AC 24 V⏊, max. 0.5 A): Fan speed low |
13 | DO2 | D igital O utput 2 (AC 24 V⏊, max. 0.5 A): Fan speed medium |
14 | DO3 | D igital O utput 3 (AC 24 V⏊, max. 0.5 A): Fan speed high |
20 | CDO | C ommon (AC 24 V~) for D igital O utputs: for DOs or UO1 |
(when configured as DO)
21| MUO| M easuring ground for U niversal O utputs (-DC 0…10 V):
for UOs (when configured as AOs)
22| DO4| D igital O utput 4 (AC 24 V⏊, max. 0.5 A):
● Electric heater (2-pipe FCU with electric heater)
● Cooling valve (4-pipe FCU)
23| UO1| U niversal O utput 1 (AC 24 V⏊, max. 2.0 A or +DC 0…10 V, max. 5 mA):
● Heating or cooling valve (2-pipe FCU and 2-pipe FCU with electric heater)
● Heating valve (4-pipe FCU)
24| UO2| U niversal O utput 2 (+DC 0…10 V):
● Fan (all applications with DC fan)
● Cooling valve (4-pipe FCU with 3-speed fan)
| |
30| AI1| A nalog I nput 1 (PT1000 sensor, 32…122 °F (0…50 °C)):
● External room temperature sensor
● Supply air temperature sensor
31| UI1| U niversal I nput 1 (PT1000 sensor, 32…212 °F (0…100 °C) or contact):
● Change-over temperature sensor or contact
● Window contact
32| DI1| D igital I nput 1 (Contact):
● Presence detector
● Window contact
33| M| M easuring ground: for AI1 or UI1 (when configured as AI)
| |
40| C| C ommon (DC 24 V): for DI1 and UI1 (when configured as DI)
---|---|---
41| REF| BACnet MS/TP Reference
42| –| BACnet MS/TP –
43| +| BACnet MS/TP +
Inputs
BACnet MS/TP
Outputs
DIMENSIONS
Issued by Siemens Switzerland Ltd Smart Infrastructure Global
Headquarters Theilerstrasse 1a CH-6300 Zug
+41 58 724 2424
www.siemens.com/buildingtechnologies
© Siemens Switzerland Ltd, 2022 Technical specifications and availability subject to change without notice
- Document ID A6V12045445_en–_a
- Edition 2022-04-26
References
- Smart Information Delivery
- Smart Information Delivery
- Building technology - Siemens Global
- BTL Listing of Tested Products – BACnet Testing Laboratories
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