Flush-mounted room thermostat with RS485 Modbus communications RDF660MB/MM, RDF660MB For 2-pipe, 2-pipe with electric heater and 4-pipe fan coil units ● ● ● ● ● ● ● ● ● ● ● ● ● ● A6V12005486_en--_c 2021-05-17 AC 230 V operating voltage Large, backlit display On/off or 3-position control outputs Automatic or manual fan speed control ECM fan DC 0...
Use Applications Room temperature control (heating or cooling) in individual rooms and zones by means of: ● 2-pipe fan coil units ● 2-pipe fan coil units with electric heater ● 4-pipe fan coil units The room thermostat controls: ● One ECM fan ● One or two on/off valve actuators ● One on/off valve actuator and one 1-stage electric heater ● One 3-position valve actuator ● One 1-stage compressor with electric heater Used in systems with: ● Heating or cooling ● Automatic heating/cooling changeover ● Manual heat
– Electric heater enabled (DI) – Fault input (DI) – Monitor input (DI) – Monitor input (AI) – Automatic heating/cooling changeover sensor (DI) – Presence detector (DI) ● ● ● ● ● ● ● ● ● – Hotel keycard (DI) Advanced fan control function, e.g.
Equipment combinations Type of unit Cable temperature or changeover sensor, cable length 2.5 m NTC (3 kΩ at 25 °C) Product no. Data sheet *) QAH11.1 1840 Room temperature sensor NTC (3 kΩ at 25 °C) QAA32 1747 Cable temperature sensor cable length 4 m NTC (3 kΩ at 25 °C) QAP1030/UFH 1854 QXA2601 / QXA2602 / QXA2603 / AQX2604 3302 Condensation monitor / Dewpoint monitor On/Off actuators Type of unit Electromotive On/Off actuator Data sheet *) SFA21.. 4863 MVI../MXI.. A6V11251892 SUA..
*) The documents can be downloaded from http://siemens.com/bt/download. For the maximum number of actuators in parallel, refer to information in the data sheets of the selected actuators and to this list, depending on which value is lower: ● Parallel operation of max 6 SS… actuators (3-pos) is possible. ● Parallel operation of max 10 On / Off actuators is possible. ● Parallel operation of SQS35 is not possible.
Display 1. Operating mode Protection Comfort Economy 2. Displays room temperature, setpoints and control parameters Symbol indicates current room temperature 3. Fan mode Auto fan active Fan speed: low, medium, high 4. Indicates fault or reminder 5. Heating/cooling mode Cooling Heating Electrical heater active (RDF660MB only) 6. Condensation in room (dew point sensor active) 7. Additional user information, like room temperature, outdoor temperature ( from Modbus (selectable via parameters) 8.
Product documentation Title Document ID Operating instructions A6V12060783 Basic documentation A6V12114068 CE declarations A5W00156993A RCM A5W00156996A Environmental product declaration A5W00139322A Related documents such as environmental declarations, CE declarations, etc., can also be downloaded at the following Internet address: http://siemens.
Mounting and installation Mounting ● ● ● ● ● Wiring Mount the room thermostat on a recessed square conduit box with 60 mm fixing centers. Do not mount on a wall in niches or bookshelves, behind curtains, above or near heat sources, or exposed to direct solar radiation. Mount about 1.5 m above the floor. Mount the room thermostat in a clean, dry indoor place without direct airflow from a heating / cooling device, and not exposed to dripping or splash water.
Commissioning Applications The room thermostat is delivered with a fixed set of applications. Select and activate the relevant application during commissioning using one of the following tools: ● Local DIP switch and HMI ● Modbus commissioning tools Set the DIP switches before snapping the front panel onto the mounting plate, if you want to select an application via DIP switches. All DIP switches need to be set to “OFF” ("remote configuration"), if you want to select an application via commissioning tools.
Open Source Software (OSS) All open source software components used within the product (including their copyright holders and the license conditions) can be found from the website https://www.siemens.com/download?A6V11893104. 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 Power supply Operating voltage AC 230 V +10/-15 % Frequency 50/60 Hz Power consumption 9 VA ● No internal fuse! External preliminary protection with max. C 10 A circuit breaker required in all cases. Outputs DC fan control DC 0…10 V; Y50 SELV DC 0…10 V, max. 5 mA Control output Y1-N / Y2-N (N.O.) Rating AC 230 V Max. 5(2) A Multifunctional inputs S1 (X2)-M/B1 (X1)-M Temperature sensor input Type NTC (3 kΩ at 25 °C) Temperature range 0…49 °C Cable length Max.
Modbus Interface type RS485 Modbus RTU Wire (ref.): 16 AWG, 1 pair, shielded serial line with 1.5 mm2 and length < 1200 m Bus current Max. 50 mA Bus topology: See Modbus manual (Modbus over serial line specification and implementation guide from http://www.modbus.org) Operational data Switching differential, adjustable Heating (P30) 2 K (0.5…6 K) Cooling (P31) 1 K (0.
Environmental conditions Storage Climatic conditions Transport Climatic conditions Operation Climatic conditions IEC 60721-3-1 Class 1K3 IEC 60721-3-2 Class 2K3 IEC 60721-3-3 Class 3K5 1) Standards and directives EU conformity (CE) A5W00156993A* RCM conformity A5W00156996A* Safety class II as per EN 60730-1 Pollution class Class 2 Degree of protection of housing IP30 as per EN 60529 Housing flammability class according to UL94 V-0 Environmental compatibility The product environmental declarat
Diagrams Connection terminals RDF660MB/MM RDF660MB L, N Operating voltage AC 230 V Y50 DC 0...10 V fan output M Reference for DC fan Y1, Y2 Control output “Valve” AC 230 V (N.O., for normally closed valves), output for compressor or output for electric heater B1, S1 (RDF660MB/MM only) Multifunctional input for temperature sensor (e.g. QAH11.
Connection diagrams Application 2-pipe, 2-position 2-pipe, 3-position 4-pipe 1-stage compressor (heating and/or cooling) 1-stage compressor with electric heater (RDF660MB only) N1 Room thermostat RDF660MB/MM, RDF660MB C1, C2 1-stage compressor V1 Valve actuator, 2- or 3-position V1, V2 Valve actuator, 2-position S2 Switch (keycard, window contact, presence detector, etc.) B2 Temperature sensor (return air temperature, external room temperature, changeover sensor, etc.
Applications for fan coil systems Application and output signal, DIP switches, diagram 2-pipe fan coil unit On/Off (heating or cooling) 2-pipe fan coil unit with electric heater (heating or cooling) On/Off (RDF660MB only) 2-pipe fan coil unit modulating, 3-position (heating or cooling) 4-pipe fan coil unit On/Off (heating and cooling) V1 Heating or heating/cooling valve actuator B1 Return air temperature sensor or external room temperature sensor (optional) V2 Cooling valve actuator B2 E1 Electri
Applications for universal systems Application and output signal, DIP switches, diagram Chilled/heated ceiling On/Off (heating or cooling) Chilled/heated ceiling with electric heater (heating or cooling) On/Off (RDF660MB only) Chilled/heated ceiling modulating, 3-position (heating or cooling) Chilled ceiling and radiator On/Off (heating and cooling) V1 Heating or heating/cooling valve actuator B1 Return air temperature sensor or external room temperature sensor (optional) V2 Cooling valve actuator
Application for heat pump systems Application and output signal, DIP switches, diagram 1-stage compressor (heating or cooling) On/Off 1-stage compressor with electric heater (heating or cooling) On/Off (RDF660MB only) 1-stage compressor On/Off (heating and cooling) N1 Thermostat Terminal Y1: Heating (H&C) or Heating/Cooling Terminal Y2: Cooling (H&C) B1 Return air temperature sensor or external room temperature sensor (optional) E1 Electric heaters (RDF660MB only) D3 Dewpoint sensor 18 Siemens Smart
Dimensions Dimensions in mm 19 Siemens Smart Infrastructure A6V12005486_en--_c 2021-05-17
Issued by Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug +41 58 724 2424 www.siemens.com/buildingtechnologies Document ID A6V12005486_en--_c Edition 2021-05-17 © Siemens Switzerland Ltd, 2021 Technical specifications and availability subject to change without notice.
