STRA-14 Control equipment Fläkt Woods Functions STRA-14 Temperature control CO 2 level control Free cooling feature Occupancy detection Condensation risk detection Communication: Modbus or BACnet Mode selection (normal, boost or energy saving mode) STRA-14 is a pre-programmed room controller intended to control the temperature and the CO 2 level in rooms. It is preprogrammed with communication and is intended for use in premises with high comfort and low energy demands, e.g. offices, schools, shopping centres, airports, hotels and hospitals. The STRA-14 is able to optimise energy consumption in rooms depending on different parameters: occupancy, CO 2 level, outside conditions (free cooling feature) and timetable. The thermal actuator of the water coils (heating and cooling) are controlled by the STRA-14 through 24V PWM signal or 0 10V outputs. The linear actuator of the outlet induction system (WEGA, WEGA Power, STELLA and NOVA chilled beams equipped with Motorized Energy Control) is controlled through a 0 10V output. The room controller STRA-14 will manage the risks of condensation in the room thanks to a condensation sensor located over the piping or a windows contact. Product facts Supply voltage, 18-30 V AC, 50-60 Hz Built-in temperature sensor Display 3 or 6 positions controller for outlet induction Easy installation thanks to separate basic plate for cable connections Communication via RS485: Modbus, BACnet or EXoline Outputs for thermal actuator: 24V Ac or 0 10V Inputs: external room sensor, CO 2 sensor, occupancy sensor, condensation detector al. windows contact 5 different pre-programmed control sequences relevant for chilled beam applications Fläkt Woods 9248 GB 2014.04 1 Specifications are subject of alteration without further notice.
Applications Controller operating modes Unscheduled time mode (OFF) This mode is activated by communication or the ON/OFF button (if configured). The controller is off and no heating or cooling is performed. However, if the temperature falls below a certain point (default 8 C, configurable) the controller starts to heat to prevent freezing. The airflow is according to nozzle for Energy saving (parameter 306). is pushed. The room controller regulates the temperature around the temperature setpoint. Unoccupied mode This mode is activated from BMS, none presence when using occupancy sensor or by pushing the Function button more than 5 seconds. The heating and cooling setpoints are extended (default 19 C for heating and 27 C for cooling). The airflow is according to nozzle for Energy saving (parameter 306). If the temperature increases even though the cooling valve is fully open the airflow will increase step by step. If free cooling is available (signal from communication is adjusted with parameter 309), the airflow will increase step by step before it opens the cooling valve. If the occupancy sensor detects occupancy the controller will change to occupied mode. Standby mode This mode can be used instead of "unoccupied mode" for non presence when using occupancy sensor. If the occupancy sensor is not connected, this mode cannot be activated (e.g. in a Landscape office). When the occupancy detector does not detect anybody, the setpoints for heating and cooling are extended (configurable values, ±3 C). For the version with MEC, the airflow is according to nozzle for Energy saving (parameter 306). If the temperature increases even though the cooling valve is fully open the airflow will increase step by step. If free cooling is available (signal from communication or adjusted with parameter 309), the airflow will increase step by step before it opens the cooling valve. If the occupancy sensor detects occupancy the controller will change to occupied mode. Occupied mode The Occupied operating mode means that the room is in use and is adjusted according to comfort mode. The airflow is preset according to parameter 307. The room controller controls the temperature around the heating or cooling temperature setpoints. For the version with MEC, if the temperature still increases even though the cooling valve is fully open, the airflow will increase step by step. If free cooling is available (signal from communication or adjusted with parameter 309), the airflow will increase step by step before it opens the cooling valve. If a CO 2 -sensor is connected it will override the temperature control of the linear actuator output. Boost mode (only for MEC version) This mode is activated by the button from Normal mode. The maximum air level is set by parameter 308, boost mode, for a predefined period of time or until the button Fläkt Woods 9248 GB 2014.04 2 Specifications are subject of alteration without further notice.
Applications Functions 6 or 3 positions function (only for MEC version) The 6-position function works on the UO3-output (MEC linear actuator). It works in the way that a certain voltage from the controller corresponds to a certain position on the MEC linear actuator. So when the controller output is within a certain range the UO3-output sets a specified voltage. The output on the UO3 is also depending on the controller state. Each mode of the room controller is related to an air level and this is set by parameter 306, 307 and 308. Cooling sequence without free cooling When there is no free cooling available, the controller works with cooling output and linear actuator output in sequence. The cooling output works when the PID output is between 0 48% and the linear actuator output works when the PID output is between 52 100%. When there is no demand for the linear actuator output, it is controlled to its minimum position for the current controller mode. The maximum linear actuator position is a configurable parameter in the parameter list. Cooling sequence with free cooling (only for MEC version) When there is free cooling available, the controller works with linear actuator output and cooling output in sequence. The linear actuator output works when the PID output is between 0 48% and the cooling output works when the PID output is between 52 100%. When there is no demand for the linear actuator output, it is controlled to its minimum position for the current controller mode. Free cooling is used when the AHU can produce free cooling and sends a signal via the BMS or adjusted with parameter 309. The maximum linear actuator position is a configurable parameter and selected in a parameter list (Maximum Air Level Cooling). It is used in following modes: Unoccupied, Standby and Occupied mode. % Output signal Nozzle for maximum cooling, Parameter 304 100 100 % Output signal Nozzle for maximum coolin Parameter 304 Airflow level default depending on mode 0 Airflow level depending on mode Cooling 1 Cooling 2 48% 52% % Cooling demand 0 Cooling 1 Cooling 2 48% 52% % Cooling demand Fläkt Woods 9248 GB 2014.04 3 Specifications are subject of alteration without further notice.
Applications Airflow sequence depending on CO 2 (only for MEC version) If there is a CO 2 -sensor connected to the controller, the airflow linear actuator (UO3) is controlled by the CO 2 -level in the room and the cooling valve (UO2) is controlled by the temperature in the room. For the CO 2 -sequence, the maximum nozzle is selected by parameter 305 (FS is nozzle 6). When there is a CO 2 -sensor connected to the controller the air level 6 is allowed as maximum air level. Below is a graph that shows the UO3-output when a CO 2 -sensor is connected. The UO2-output is controlled as in previous sequences. Fläkt Woods 9248 GB 2014.04 4 Specifications are subject of alteration without further notice.
Application example - Temperature control Purpose Note Control the temperature in the room thanks to the thermal actuators. External sensor STRZ-05 may be used when the internal temperature sensor doesn't measure the average room temperature (because of STRA-14 location). Condensation sensor and window contact cannot be connected together. Adapter may be required, if another thermal actuator than is used. Fläkt Woods 9248 GB 2014.04 5 Specifications are subject of alteration without further notice.
Application example - Temperature control with energy saving mode SCADA Purpose Note Control the temperature in a closed room thanks to the thermal actuators and/or motorized nozzles of primary air (if free - cooling is configured). Save the energy when in unoccupied mode thanks to the occupancy detector reducing the primary air External sensor STRZ-05 may be used when the internal temperature sensor doesn't measure the average room temperature (because of STRA-14 location). Condensation sensor and window contact can't be connected together. Adapter may be required, if another thermal actuator than is used. Fläkt Woods 9248 GB 2014.04 6 Specifications are subject of alteration without further notice.
Application example - CO 2 level and temperature control with energy saving mode Purpose Note Control the CO 2 level in a landscape office or in a meeting room thanks to motorized nozzles of primary air Control the temperature in a closed room thanks to the thermal actuators and/or motorized nozzles of primary air (if free - cooling is configured). Save the energy when in unoccupied mode thanks to the occupancy detector reducing the primary air External sensor STRZ-05 may be used when the internal temperature sensor doesn't measure the average room temperature (because of STRA-14 location). Condensation sensor and window contact can't be connected together. Adapter may be required, if another thermal actuator than is used. Fläkt Woods 9248 GB 2014.04 7 Specifications are subject of alteration without further notice.
Application example - Miscellaneous STRA-14-00-0-01 CHILLED BEAM and valve STRA-14-00-0-01 CHILLED BEAM and valve Occupancy detector STRZ-09-1 Condensation detector STRZ-16-1 24 VAC 24 VAC 230 VAC Transformer STRZ-24-1 230 VAC Transformer STRZ-24-1 and valve RADIATOR STRA-14-00-0-01 CHILLED BEAM WITH HEATING AND COOLING STRA-14-00-0-01 UP TO EIGHT CHILLED BEAMS Eight thermal actuators and valves 2 x thermal actuator and valve Condensation detector STRZ-16-1 Condensation detector STRZ-16-1 24 VAC 24 VAC 230 VAC Transformer STRZ-24-1 230 VAC Transformer STRZ-24-1 Eight thermal actuators and valves EIGHT RADIATORS STRA-14-00-0-01 CHILLED BEAM and valve Condensation detector STRZ-16-1 24 VAC 230 VAC Transformer STRZ-24-1 and valve RADIATOR Fläkt Woods 9248 GB 2014.04 8 Specifications are subject of alteration without further notice.
Technical data Supply voltage 18 30 V AC, 50 60 Hz Internal consumption 2.5 VA Ambient temperature 0 50 C Storage temperature -20 +70 C Ambient humidity Max 90% RH Protection class IP20 Communication RS485 (EXOline or Modbus) with automatic detection/change-over Modbus 8 bits, 1 or 2 stop bits. Odd, even (FS) or no parity. Communication speed 9600 bps (not changeable) Built-in temperature sensor NTC type, measuring range 0 50 C, accuracy +/-0.5 C at 15 30 C Inputs External room sensor CO 2 sensor Occupancy detector Condensation detector alt. window contact PT1000-sensor, 0 50 C. Suitable sensor is Fläkt Woods STRZ-05 STRZ-18-1 Closing potential-free contact. Suitable detector is Fläkt Woods STRZ-09 Fläkt Woods condensation detector STRZ-16 alt. Window contact STRZ-38 resp. potential-free contact Wiring diagrams STRA-14 with: Window contact STRZ-38 External temperature sensor STRZ-05 Actuator for nozzles IQAZ-23 Actuator for cooling valve Transformer STRZ-24 Outputs Forced ventilation Valve actuator alt. thermal actuator Control Actuator exercise Terminal blocks 24 V AC actuator, max 0.5 A 2 outputs 0 10 V DC, max 5 ma 24 V AC, max 2.0 A Heating or cooling FS = 23 hours interval So-called lift type for cable cross-section 2.1 mm 2 Communication STRA-14 is equipped with BACnet and Modbus communication as standard. It can act as a stand-alone unit or be connected to a central SCADA-system via RS485 (BACnet, Modbus or Exoline). STRA-14 with: CO 2 sensor, STRZ-18 Occupancy sensor STRZ-09 Actuator for nozzles IQAZ-23 Actuator for cooling and heating valve Transformer STRZ-24 Fläkt Woods 9248 GB 2014.04 9 Specifications are subject of alteration without further notice.
Technical data Display functions Dimensions Thanks to the parameter 42, you can display the following information: 0 = Room temp (default value) 1 = Heating setpoint 2 = Cooling setpoint 3 = Average cooling/heating setpoint 4 = Only setpoint offset 5 = CO 2 level 6 = Heating setpoint plus setpoint offset 7 = Cooling setpoint plus setpoint offset 8 = Average cooling/heating setpoint plus setpoint offset The product fulfils the requirements for valid European EMC-standard CENELEC EN 61000-6-1 and EN 61000-6-3, as well as valid European LVD-standard IEC 60 730-1, and is CE-marked. Fläkt Woods 9248 GB 2014.04 10 Specifications are subject of alteration without further notice.
Quick installation STRA-14 STRA-14 is a room controller for multiple beams. Each chilled beam has unique settings, configured in STRA-14. This quick installation guide will guide you through these settings. 1. Press the INCREASE and DECREASE buttons simultaneously for about 5 seconds until Service indication lights up in the display. 2. Double click the INCREASE button to enter the parameter list in which all parameters of the regulator are set. Adjust chilled beam type related parameters The room controller has factory settings for WEGA/ NOVA (IQFH). If you are using a WEGA/NOVA you can jump to 11. The room controller STRA-14 is working with six position control of the nozzles of the chilled beam. Each nozzle corresponds to DC voltage between 0-10 V on the linier motor. The following steps guide you how to enter the voltage in to the room controller for each nozzle. Nozzle 1 is fixed to 0 V and nozzle 6 fixed to 10V and does not need to be adjusted. 3. Press INCREASE or DECREASE button to parameter 300 and the 4. Enter the voltage (Voltage x 10) for nozzle 2 and confirm with FUNCTION button. STELLA 23 WEGA/NOVA 21 (Default value) WEGA Power 23 5. Press INCREASE once to parameter 301 and then press the FUNCTION button. 6. Enter the voltage (Voltage x 10) for nozzle 3 and confirm with FUNCTION button. STELLA 40 WEGA/NOVA 38 (Default value) WEGA Power 23 7. Press INCREASE once to parameter 302 and then press the FUNCTION button. 8. Enter the voltage (Voltage x 10) for nozzle 4 and confirm with FUNCTION button. STELLA 59 WEGA/NOVA 56 (Default value) WEGA Power 23 9. Press INCREASE once to parameter 303 and then press the FUNCTION button. 10. Enter the voltage (Voltage x 10) for nozzle 5 and confirm with FUNCTION button. STELLA 75 WEGA/NOVA 73 (Default value) WEGA Power 23 Presence sensor If you do not have a presence sensor jump to 15. 11. Press INCREASE or DECREASE to parameter 45 and 12. Change value to 1 (Unoccupied). Confirm with FUNCTION button. 13. Press INCREASE or DECREASE to parameter 17 and 14. Change value to "3". Confirm with FUNCTION button External temperature sensor If you do not have a external presence sensor jump to 17. 15. Press INCREASE or DECREASE to parameter 15 and 16. Change value to 1 (External room sensor). Confirm with FUNCTION button. Window sensor If you do not have a Window sensor jump to 19. 17. Press INCREASE or DECREASE to parameter 18 and 18. Change value to 1 (Window sensor). Confirm with FUNCTION button. CO 2 -sensor If you don't have a CO 2 sensor jump to 21. 19. Press INCREASE or DECREASE to parameter 81 press FUNCTION button. 20. Change value to "5". Confirm with FUNCTION button. Condensate sensor If you don't have condensate sensor jump to 23. 21. Press INCREASE or DECREASE buttons to parameter 18 and 22. Change value to "2". Confirm with FUNCTION button. Lighting via occupancy sensor 23. Press INCREASE or DECREASE button to parameter 60 and 24. Change value to 1. Confirm with FUNCTION button. Set points Following steps are to adjust set point values for the room controller. Room controller has factory settings which are recommended by Fläkt Woods and they do not need to be adjusted. Set point value Heating (default 22 C) 25. Press INCREASE or DECREASE to parameter 1 and Fläkt Woods 9248 GB 2014.04 11 Specifications are subject of alteration without further notice.
Quick installation STRA-14 26. Change value to set point temperature. Confirm with FUNCTION button. Set point value Cooling (default 24 C) 27. Press INCREASE or DECREASE to parameter 2 and 28. Change value to set point temperature. Confirm with FUNCTION button. Nozzle for Energy Saving (default nozzle 1) 29. Press INCREASE or DECREASE to parameter 306 and press the FUNCTION button 30. Change value for nozzle at Energy Saving (1-4). Confirm with FUNCTION button. Nozzle for Normal mode (default nozzle 2) 31. Press INCREASE or DECREASE to parameter 307 and 32. Change value for nozzle at Normal mode (2-5). Confirm with FUNCTION button. Nozzle for Boost mode (Function button) (Default nozzle 6) 33. Press INCREASE or DECREASE to parameter 308 and 34. Change value for nozzle at Boost mode - Function button (3-6). Confirm with FUNCTION button. Nozzle for Boost mode (at Maximum cooling request) (Default nozzle 5) 35. Press INCREASE or DECREASE to parameter 304 and 36. Change value for nozzle at Boost mode at Maximum cooling request (3-6). Confirm with FUNCTION button. Nozzle for Boost mode (at high CO 2 -level) (Default nozzle 6) 37. Press INCREASE or DECREASE to parameter 305 and 38. Change value for nozzle at Boost mode high CO 2 - level (3-6). Confirm with FUNCTION button. For more detailed information please see the maintenance instruction. Fläkt Woods 9248 GB 2014.04 12 Specifications are subject of alteration without further notice.