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STRA-14 Room controller. Installation and maintenance manual.
STRA-14 for chilled beams
STRA-14 is the room controller for the motorised energy control
(MEC) and constant air volume chilled beams
It is possible to set different parameter values in a parameter menu
in the display, using the buttons on the controller. You change
parameter values with the INCREASE and DECREASE buttons and
confirm changes with the Function button.
Technical data
Supply voltage
Internal consumption
Ambient temperature
Storage temperature
Ambient humidity
Protection class
Communication
Modbus - Bacnet - MSTP
Communication speed
Built-in temperature sensor
Material, casing
Weight
This product conforms with the requirements of European EMC standards CENELEC EN 61000-6-1 and EN
61000-6-3, and the requirements of European LVD standard IEC 60 730-1. It carries the CE mark.
Inputs
External room sensor
Occupancy detector
Condensation detector alt.
window contact
CO
sensor
2
Outputs
Forced ventilation
Valve actuator alt. thermal
actuator
Valve actuator
Thermal actuator
Control
Actuator exercise
Terminal blocks
Fläkt Woods
8710 GB 2016.09.08
18...30 V AC, 50...60 Hz
2.5 VA
0...50°C
-20...+70°C
Max 90% RH
IP20
RS485 (EXOline or Modbus) with automatic detection/change-over
8 bits, 1 or 2 stop bits. Odd, even (FS) or no parity.
9600 bps (not changeable)
NTC type, measuring range 0...50°C, accuracy +/-0.5°C at 15...30°C
Polycarbonate, PC
110 g
PT1000-sensor, 0...50°C. Suitable sensor is Fläkt Woods STRZ-05
Closing potential-free contact. Suitable occupancy detector is Fläkt Woods STRZ-09.
Fläkt Woods condensation detector STRZ-16 alt. window contact STRZ-38 resp.
potential-free contact
STRZ-18 (0-10V).
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 mm2
1 (12)
Specifications are subject of alteration without further notice.
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Summary of Contents for FlaktWoods STRA-14
- Page 1 STRA-14 Room controller. Installation and maintenance manual. STRA-14 for chilled beams STRA-14 is the room controller for the motorised energy control (MEC) and constant air volume chilled beams It is possible to set different parameter values in a parameter menu in the display, using the buttons on the controller.
- Page 2 STRA-14 Room controller. Installation and maintenance manual. Installation instructions Ensure that the installation complies with local safety regulations. Information about commissioning of the product can be found in the manual ”STRA Manual”, which is available for download from www.flaktwoods.com. 2 (12) Fläkt Woods 8710 GB 2016.09.08...
- Page 3 Function button By pressing the Function button for less than 5 seconds when the controller STRA-14 is in the preset operating mode (parameter 45, F5 = 3 = Occupied), the controller changes the operating mode to Boost. If you press the...
- Page 4 Wiring STRA-14 has been constructed to be as compact as possible. Therefore, the controller’s communication input is not galvanically separated from the supply voltage. This means that it is important to keep G and G0 in order, as well as the communication input’s A and B.
- Page 5 STRA-14 Room controller. Installation and maintenance manual. setpoint value depending on the configuration) are shown Operating modes in the display. Learn more in section Occupancy detector. STRA-14 has five different operating modes. Through the Function button you are able to switch between three Occupied (Normal Mode) of them.
- Page 6 STRA-14 Room controller. Installation and maintenance manual. Control states Function button The controllers can be configured for different control states/control sequences (Parameter 11, FI = 4 = Heating/ Cooling with VAV-control with forced ventilation): • Heating (UO1) • Heating/Heating (UO1/UO2) •...
- Page 7 Free cooling can also be turned on and off through modbus communication. Actuators STRA-14 can be used with two types of actuators: control • Analogue 0…10 V actuators • Thermal actuators Fläkt Woods STRZ-18-1-1 is an active CO detector (0-10V).
- Page 8 STRA-14 Room controller. Installation and maintenance manual. Frost protection STRA-14 has built-in frost protection, which is activated when the controller is not in use. The frost protection prevents the temperature from dropping below 8°C. Return to normal fan speed and control occurs automatically when the room temperature exceeds 8°C.
- Page 9 STRA-14 Room controller. Installation and maintenance manual. Parameter Settings STRA-14 is delivered with a number of factory settings. To acquire the desired function, the controller must be adapted to it’s specific application. This is done through the parameter menu in the display. Applications may vary and incorrectly set parameters can effect the controller and application negatively.
- Page 10 STRA-14 Room controller. Installation and maintenance manual. Parameter Description Values Unit FS STRA-14 number 0=Heat, 1=Heat/Heat, 2=Heat or Cool via changeover, 3=Heat/Cool, 4=Heat/Cool with VAV and forced Heating/Cooling Functions ventilation, 5=Heat/Cool with VAV, 6=Cool, 7=Cool/Cool, 8=Heat/ Cool with UO3, 9=Heat/Cool with...
- Page 11 STRA-14 Room controller. Installation and maintenance manual. Parameter Description Values Unit FS STRA-14 number Maximum airflow on cooling UO2 in % of 0-10V. Parameter is in use when heating/cooling mode with VAV is selected 0=No Control, 1=Heating, Fan Control (Not in use)
- Page 12 STRA-14 Room controller. Installation and maintenance manual. Parameter Description Values Unit FS STRA-14 number Com bus speed 0=9600, Com Speed 1=19200, 2=38400, 3=76800 (BACnet) Reset com to factory default (Modbus 9K6, 8, N, 1) The lowest output the fan will need to start (Not in...