Flush-mounted room thermostat with weekly time program RDF660T For 2-pipe, 2-pipe with electric heater, and 4-pipe fan coil units ● ● ● ● ● ● ● ● ● ● ● ● ● ● A6V12048672_en--_c 2021-05-17 AC 230 V operating voltage Large, backlit display Infrared remote control receiver Auto Timer mode with 8 programmable timers On/Off or 3-position control outputs ECM fan DC 0...
Use Applications Room temperature control in individual rooms and zones: ● Heated or cooled with 2-pipe fan coil units ● Heated or cooled with 2-pipe fan coil units with electrical heater ● Heated and cooled with 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 heat
● ● ● ● User and parameter settings can be retained in case of power failure and operating mode can be returned to the previous operating mode, Comfort or Protection (depends on P27) Reload factory settings for commissioning and control parameters 7-day time program (can be disabled via P77): 8 programmable timers to switch over between Comfort and Economy Infrared remote control Type summary Product no. Stock no. Operating voltage On/Off RDF660T S55770T434 AC 230 V 1) Time proDC 0...
On/Off actuators Type of unit Electromotive On/Off actuator Data sheet *) SFA21.. 4863 MVI../MXI.. A6V11251892 SUA.. 4832 Thermal actuator (for radiator valves) STA23... 4884 Thermal actuator (for small valves 2.5 mm) STP23... 4884 Product no. Data sheet *) Electromotive On/Off valve and actuator (only available in AP, UAE, SA and IN) Zone valve actuator (only available in AP, UAE, SA and IN) 3-position actuators Product no.
Mechanical design The thermostats consist of 2 parts: ● Front panel with electronics, operating elements and built-in room temperature sensor. ● Mounting base with power electronics. The rear of the mounting base contains the screw terminals. Slide the front panel in the mounting base and snap on. Operation and settings 1. Change operating mode selector 2. Change fan operation 3. Set time of day and weekday 4. Confirm 5. Adjust setpoint, control parameters and time of day 6. Infrared receiver 7.
Display 1. Operating mode Protection Auto timer mode Comfort Economy 2. Display room temperature, setpoints and control parameters. Symbol to display the current room temperature 3. Fan mode Auto fan active Fan speed low, medium, high 4. Indicate fault or reminder 5. Heating/cooling mode Cooling Heating Electrical heater active 6. Condensation in room (dewpoint sensor active) 7. Room temperature, setpoint or current time of day 8. Key lock active 9. Weekday 1...
Product documentation Title Document ID Operating instructions A6V12064527 Basic documentation A6V12166490 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.
Notes Security 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 and installation Mounting ● ● ● Mount the room thermostat on the conduit box. 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.
Commissioning Set the thermostat application via the DIP switches before snapping the front panel onto the mounting base. After power is applied, the thermostat resets all LCD segments light up indicating that resetting was correct. After reset, which takes about 3 seconds, the thermostat is ready for commissioning by qualified HVAC staff. The control parameters of the thermostat can be set to ensure optimum performance of the entire system (see basic documentation A6V12166490).
Technical data Power supply Operating voltage AC 230 V Frequency 50/60 Hz Power consumption 9 VA External supply line protection (EU) Circuit breaker max. 10 A characteristic B, C, D as per EN 60898 or power source with current limitation of max. 10 A ● No internal fuse! External preliminary protection with max. C 10 A circuit breaker in the supply line required under all circumstances. 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.
Function input External temperature sensor, Selectable heating/cooling changeover sensor, window X1: P38 contact, dewpoint sensor, enable electrical X2: P40 heater contact, alarm contact, presence detector, hotel keycard Operational data Switching differential, adjustable Heating (P30) 2 K (0.5…6 K) Cooling (P31) 1 K (0.
Standards and directives EU conformity (CE) A5W00156993A* RCM conformity A5W00156996A* Protective 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 declaration (A5W00139322A *) contains data on environmentally compatible product design and assessments (RoHS compliance, materials composition, packaging, environmental benefit, disposal).
Diagrams Connection terminals 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 electrical heater X1, X2 Multifunctional input for temperature sensor (e.g. QAH11.1) or potential-free switch M Measuring neutral for sensor and switch Connection diagrams N1 Room thermostat M1 DC 0...10 V fan V1...
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 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 Electric heater M1 ECM
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 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 B2 E1 Electric
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 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 D3 Dewpoint sensor 16 Siemens Smart Infrastructure A6V12048672_en-
Dimensions Dimensions in mm 17 Siemens Smart Infrastructure A6V12048672_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 A6V12048672_en--_c Edition 2021-05-17 © Siemens Switzerland Ltd, 2021 Technical specifications and availability subject to change without notice.
