RDF660T Flush-mounted room thermostat with weekly time program Basic Documentation A6V12166490_en--_c 2021-05-17 Smart Infrastructure
Table of Contents 1 About this document .................................................................................5 1.1 1.2 1.3 Revision history ...........................................................................................5 Reference documents..................................................................................5 Before you start ...........................................................................................5 1.3.1 Copyright ...................................
4.6.7 4.7 Setpoints and sequences ........................................................... 35 4.8 4.9 Control outputs ......................................................................................... 36 4.7.1 Overview.................................................................................... 36 Fan control ............................................................................................... 37 Multifunctional input, digital input..............................................
About this document Revision history 1 1 About this document 1.1 Revision history Edition Date Changes Section 1 January 2021 First version. All 1.1 March 2021 ● ● Update Multifunctional input info Add setpoint related info 4.9, 4.13.3 4.3.2 2 May 2021 ● Update commissioning and display info 3 May 2021 ● Add monitor input info 3.2, 3.3 2.2, 4.9, 4.13.3 1.2 Reference documents Document number Subject Ref.
1 About this document Before you start ● On the intranet (Siemens employees only) at https://wse04.siemens.com/content/P0002723/SitePages/Home.aspx ● From the Siemens branch office near you www.buildingtechnologies.siemens.com or from your system supplier ● From the support team at headquarters fieldsupport-zug.ch.sbt@siemens.
Overview Types 2 2 Overview 2.1 Types Product no. RDF660T Stock no. Operating voltage S55770T434 Control outputs On/Off 3-pos ✓ AC 230 V 1) DC 0...10 V 3speed ✓ - Time Backlit progra LCD DC 0...10 V m Fan types - ✓ ✓ Infrared receiver 1) ✓ ✓ Suitable conduit box Color Square or White round Order infrared remote control separately 2.
2 Overview Accessories ● ● ● ● ● ● ● ● – Monitor input (AI) – Automatic heating/cooling changeover sensor (DI) – Presence detector (DI) – Hotel keycard (DI) Advanced fan control function, i.e.
2 Overview Equipment combinations On/Off actuators Type of unit Electromotive On/Off actuator Electromotive On/Off valve and actuator (only available in AP, UAE, SA and IN) 3-position actuators SFA21.. Data sheet *) 4863 MVI../MXI.. A6V11251892 Zone valve actuator (only available in AP, UAE, SA and IN) SUA.. 4832 Thermal actuator (for radiator valves) STA23... 4884 Thermal actuator (for small valves 2.5 mm) STP23... 4884 Type of unit Product no.
3 Notes Mounting and installation 3 Notes 3.1 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. 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.
3 Notes Commissioning 3.2 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).
3 Notes Operation 3.3 Operation 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. 2. 3. 4. 5. 6. 7. 8.
Notes Operation 3 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...
3 Notes Disposal 3.4 Disposal The device is considered an electronic device for disposal in accordance with the European Guidelines 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. 3.
4 Functions Temperature control 4 Functions 4.1 Temperature control General note: Parameters Setting control parameters (P01, etc. mentioned throughout the document), see Control parameters [➙ 45]. Temperature control The thermostat acquires the room temperature via built-in sensor, external room temperature sensor (QAA32), external return air temperature sensor (QAH11.1/QAP1030/UFH), and maintains the setpoint by delivering actuator control commands to heating equipment, cooling equipment, or both.
4 Functions Operating modes 4.2 Operating modes The thermostat operating mode can be influenced in different ways (see Different ways to influence the operating mode [➙ 17]). Specific heating and cooling setpoints are assigned to each operating mode. The following operating modes are available: Operating mode Icon Auto Timer Description In Auto Timer mode, the thermostat automatically changes from Comfort to Economy as per 8 preprogrammed timers.
4 Functions Operating modes 4.2.1 Different ways to influence the operating mode Priority of operating mode interventions Priority Different interventions can influence the operating mode. The following table shows the priorities of different interventions. A lower number means higher priority. Description Remark ① Commissioning In the parameter setting mode, you can always command an operating mode independent of all other settings or intervention local input.
4 Functions Operating modes Availability of Economy mode P02 Without time schedule The operating mode is selected locally via the operating mode button. The behavior of the operating mode button (user profile) can be defined via P02, factory setting is P02 = 3.
4 Functions Room temperature setpoint 4.3 Room temperature setpoint 4.3.1 Description Comfort mode The factory setting for the Comfort basic setpoint is 21 °C and can be changed in the thermostat’s EEPROM via P08. The Comfort setpoint can be adjusted via the +/- buttons. Temporary setpoint When "Temporary comfort setpoint" is enabled via P69, the Comfort setpoint adjusted via the + / - buttons is set back to the Comfort basic setpoint stored in P08 only when the operating mode is changed.
4 Functions Room temperature setpoint CAUTION If a setpoint (Economy or Protection) is set to OFF, the thermostat does not control the room temperature in the corresponding operating mode (heating or cooling). As a result, there is no protective heating or cooling function and thus risk of frost during heating or risk of overtemperature during cooling! The Economy setpoints (P11, P12) can be accessed at the Service level; Protection setpoints (P65, P66) at the Expert level. 4.3.
Functions Application overview 4 Only required for heating and cooling applications (see Setpoints and sequences [➙ 35]) 1) General notes: ● Setting the Comfort basic setpoint resets the runtime Comfort setpoint to the basic setpoint. Notes on setpoint adjustment ● The resulting (current) setpoint for heating and cooling is limited by the Protection setpoint; if the Protection setpoint is OFF, then minimum 5 °C and maximum 40 °C are used.
4 Functions Application overview 4.4.
Functions Application overview 4 4.4.
4 Functions Application overview 4.4.
4 Functions Additional functions 4.
4 Functions Additional functions 4.5.1 Sensors and changeover functions Automatic heating/cooling changeover via changeover sensor (P36, P37) If a cable temperature sensor (QAH11.1 + ARG86.3) is connected to X1, and P38 is set to 2, the water temperature acquired by the changeover sensor is used to change over from heating to cooling, or vice versa.
4 Functions Additional functions 4.5.2 Hotel keycard/Presence detector The operating mode can be changed to Comfort or Economy based on room occupancy (room occupied or unoccupied, via presence detector or hotel keycard). The presence detector or hotel keycard input switches the operating mode to Comfort when the room is occupied and switches back to the previous operating mode when the room is unoccupied.
4 Functions Additional functions 4.5.4 Monitoring and limitation functions Floor temperature limitation function (P51) The floor temperature should be limited for two reasons: Comfort and protection of the floor. The floor temperature sensor, connected to multifunctional input X1 or X2, acquires the floor temperature. If the temperature exceeds the parameterized limit (P51), the heating valve is fully closed until the floor temperature drops below the parameterized limit.
Functions Additional functions 4 4.5.5 User operation / Indication Key lock (P14) If the "Key lock" function is enabled by P14, lock or unlock all buttons by pressing the operating mode button for 5 seconds. If "Auto lock" is configured, the thermostat automatically locks the buttons 10 seconds after the last adjustment; unlock the buttons as per manual locking. P14 can be configured as following: P14 0 Unlocked 1 Lock (all lock) 2 Setpoint adjustable 4.5.
4 Functions Control sequences 4.6 Control sequences 4.6.1 Overview of sequences (setting via P01) The main control sequence (water coil sequence of the fan coil unit) can be set via P01. The following sequences can be activated in the thermostats (with or without auxiliary heating). The available sequences depend on the application (selected via DIP switches, see Application overview [➙ 21]).
4 Functions Control sequences 4.6.2 2-pipe fan coil unit In 2-pipe applications, the thermostat controls a valve in heating/cooling mode with changeover (automatically or manually), heating only, or cooling only (factory setting, P01 = 1). On/Off control Control sequence On/Off output The diagrams below show the control sequence for On/Off control.
4 Functions Control sequences 4.6.3 2-pipe fan coil unit with electric heater Heating or cooling with auxiliary heater In 2-pipe applications with electric heater, the thermostat controls a valve in heating/cooling mode with changeover, heating only, or cooling only plus an auxiliary electric heater. Cooling only is factory-set (P01 = 1) with enabled electric heater (P13).
4 Functions Control sequences 4.6.4 4-pipe fan coil unit Heating and cooling In 4-pipe applications, the thermostat controls 2 valves in heating and cooling mode, heating/cooling by manual selection, or heating and cooling mode with changeover. Heating and cooling (P01 = 4) is factory-set. 4-pipe application with manual changeover The heating or cooling output can be released via operating mode button if P01 is set to Manual (P01 = 2).
4 Functions Control sequences 4.6.5 Chilled/heated ceiling and radiator applications For chilled/heated ceiling and radiator applications ● Set the corresponding basic application see Application overview [➙ 21].
4 Functions Control sequences 4.6.7 Setpoints and sequences 2-pipe applications In changeover applications, the Comfort setpoints for the heating and cooling sequences are identical (w). In 2-pipe applications with electric heater, the Comfort setpoint is either at the first heating sequence (in heating) or at the cooling sequence (in cooling). The setpoints for Economy and Protection are below the Comfort setpoints (for heating) and above the Comfort setpoints (for cooling).
4 Functions Control outputs 4.7 Control outputs 4.7.1 Overview Overview of control outputs Different control output signals are available and defined during commissioning (see below). Control output 2-position 3-position Y1, Y2 (2 x SPST) Y1, Y2 * (1 x / Product No. RDF660T *) ) Only on 2-pipe application On/Off control signal (2-position) The valve receives the Open/On command via control output Y1 or Y2, if 1.
4 Functions Fan control 4.8 Fan control The fan is in automatic mode or runs at the selected speed in manual mode. In automatic mode, the fan speed is based on the setpoint and the current room temperature. When the room temperature reaches the setpoint, the control valve closes and the fan switches off or remains at fan speed 1 (parameter P15, factory setting: 0 = disabled). Fan control with On/Off heating/cooling control In applications with On/Off (2-position) control: 1.
4 Functions Fan control Note When heating with the electric heater only, manual fan speed I is unavailable to ensure the required minimum air flow for the electric heater and to avoid overheating of the system. Fan operation as per Fan operation can be limited to be active with cooling only or heating only, or even heating/cooling mode, or be totally disabled via control parameter “Fan control” P52.
4 Functions Fan control WARNING Fan failure In the event of fan failure, the thermostat cannot protect the electric heater against over-temperature. Thus, the electric heater must feature a separate safety device (thermal cutout). Clean fan filter reminder The "Clean fan filter reminder" function counts the fan operating hours and displays message "FIL " to remind users to change/clean the fan filter as soon as the threshold is reached.
4 Functions Multifunctional input, digital input 4.9 Multifunctional input, digital input The thermostat has 2 multifunctional inputs X1 and X2. An NTC type sensor such as NTC 3k (AI, analog input) or a switch (DI, digital input) can be connected to the input terminals. The functionality of the inputs can be configured via P38 + P39 for X1, P40 + P41 for X2.
Functions Multifunctional input, digital input # Function of input Description 10 Presence detector The presence detector input switches the operating DI mode to Comfort when the room is occupied and returns to the previous operating mode when the room is unoccupied.
4 Functions Auto Timer 4.10 Auto Timer The thermostat provides an Auto Timer mode with 8 programmable timers. Each timer can be assigned to one or several days. In this mode, the thermostat automatically changes over between Comfort and Economy as per the preprogrammed timers. Auto Timer for Comfort Set timers Auto Timer for Economy Each timer has a Comfort start and end time that can be applied to one or several weekdays.
4 Functions Auto Timer Proceed as follows for each Auto Timer: 1. The and symbols are displayed. Press + or - button to adjust the Comfort start time and confirm by pressing 2. The and . symbols are displayed. Press + or - button to adjust the Comfort end time or Economy start time and confirm by pressing 3. Symbol . flashes. Press + or - button to select or clear each day and go to the next day. Confirm the actual timer settings by pressing and go to the next timer.
4 Functions Auto Timer Default timer setting Reload default timer setting Timers A1…A4 have the following default settings (residential use): Day Timer when thermostat is in Comfort mode Mo (1) – Fr (5) 06:30 – 08:30 (A1) 17:30 – 22:30 (A2) Sa (6) 08:00 – 23:00 (A3) Su (7) 08:00 – 22:30 (A4) ● For the remainder, the controller is in Economy ● . Timers A5…A8 are open, no default setting. The setting of timers can be changed to individual needs. The default setting can be reloaded any time: 1.
4 Functions Handling system faults 4.11 Handling system faults Temperature out of range If the room temperature exceeds or drops below the measuring range, i.e. above 49 °C or below 0 °C, the limiting temperatures blink, e.g., 0 °C or 49 °C. In addition, the heating output is activated if the current setpoint is not set to Off, the thermostat is in heating mode and the temperature is below 0 °C. For all other cases, no output is activated.
4 Functions Control parameters 4.13.1 Parameter setting via local HMI Enter only Service level 1. Press + and - buttons simultaneously for more than 6 seconds. Release and within 2 seconds, press + button again for more than 3 seconds until P01 is displayed. Continue with step 2. Enter Expert level with Diagnostics and test 1. Press + and - buttons simultaneously for more than 6 seconds. Release and within 2 seconds, press - button again for more than 3 seconds until P01 and service are displayed.
Functions Control parameters 4 4.13.
4 Functions Control parameters 4.13.3 Expert level parameters with diagnostics and test Parameter Name Factory setting Range Service level P30 Heat P-band Xp/switching differential 2K 0.5…6 K P31 Cool P-band Xp/switching differential 1K 0.5…6 K P32 Integral time (fan) 0 min 0 …20 min P33 Dead zone Comfort mode 2K 0.5…5 K P34 Setpoint differential 2K 0.5…5 K P35 Integral action time Tn 45 min 0...
Functions Control parameters Parameter Name Factory setting 4 Range Service level 3 = Cooling only P54 Fan overrun time 60 s 0...360 s P55 ECM fan max. output 80 % ECM fan min…100 % P56 ECM fan min. output 30 % 1%... ECM fan max. P59 Fan minimum ON time 2 min 1...
4 Functions Control parameters Diagnostics and test Parameter Name Factory setting Range - NONE = (No application) Service level d01 Application number 2P = 2-pipe 2P3P = 2-pipe 3-position 2PEH = 2-pipe with electric heater 4P = 4-pipe d02 X1 status - "---" = Function not selected 0 = Not activated (for DI) 1 = Activated (DI) 0…49 = Current temp.
5 Connection Connection terminals 5 Connection 5.1 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 potentialfree switch M Measuring neutral for sensor and switch 5.2 Connection diagrams N1 Room thermostat M1 DC 0...10 V fan V1...
6 Technical data 6 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.
6 Technical data Operational data Switching differential, adjustable Heating (P30) 2 K (0.5…6 K) Cooling (P31) 1 K (0.5…6 K) Comfort (P08) 21 °C (5…40 °C) Economy (P11-P12) 15 °C/30 °C (OFF, 5…40 °C) Protection (P65-P66) 8 °C/OFF (OFF, 5…40 °C) Setpoint setting and range Multifunctional inputs X1/X2 Selectable (0…11) Input X1 3 (P38) Window contact (DI) Input X2 1 (P40) External temperature sensor Built-in room temperature sensor Measuring range 0…49 °C Accuracy at 25 °C < ±0.
6 Technical data General Connection terminals Solid wires or prepared stranded wires 1 x 0.4…1.5 mm2 Housing front color RAL 9003 white Weight without/with packaging 147.6 g/255.4 g *) 1) 54 | 58 The documents can be downloaded from http://siemens.com/bt/download. No condensation is allowed.
Dimensions 7 7 Dimensions Dimensions in mm Dimensions in mm A6V12166490_en--_c 55 | 58
Index Index 1 12-hour and 24-hour format .............................. 44 3 3-position control signal.................................... 36 A Auto Timer ......................................................... 42 Automatic heating/cooling changeover ....... 26, 30 B Basic application ............................................... 34 C Changeover switch ............................................ 26 Chilled/heated ceiling applications ................... 34 Clean fan filter reminder ...........
Index W Window contact ............................................
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