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STRA-24 Installation and commissioning manual
STRA-24 for chilled beams
STRA-24 is the room controller for the pressure independent (Pi)
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
9585 GB 2015.12.16
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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Related Manuals for FlaktWoods STRA-24
Summary of Contents for FlaktWoods STRA-24
- Page 1 STRA-24 Installation and commissioning manual STRA-24 for chilled beams STRA-24 is the room controller for the pressure independent (Pi) 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.
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Page 2: Installation Instructions
STRA-24 Installation and commissioning manual Installation instructions Ensure that the installation complies with local safety regulations. 2 (12) Fläkt Woods 9585 GB 2015.12.16 Specifications are subject of alteration without further notice. -
Page 3: Wiring Diagrams
Function button By pressing the Function button for less than 5 seconds when the controller STRA-24 is in the preset operating mode (parameter 45, FS = 3 = Occupied), the controller changes the operating mode to Boost. If you press the... - Page 4 Wiring STRA-24 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.
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Page 5: Operating Modes
For more information , see Section Operating modes Occupancy detector, page 6. STRA-24 has five different operating modes. Through the Function button you are able to switch between three Occupied (Normal Mode) of them. These are set through the parameter menu (parameter 45) in the display. -
Page 6: Control States
STRA-24 Installation and commissioning manual Control states Function button The controllers can be configured for different control states/control sequences (Parameter 11, FS = 4 = Heating/ Cooling with VAV-control and forced ventilation): • Heating (UO1) • Heating/Heating (UO1/UO2) • Heating/Cooling •... -
Page 7: Free Cooling
Sometimes you get free cooling by air, if outside temperature is cooler than the setpoint room temperature. Then the STRA-24 can shift the sequence so that 0-50% is air cooling and 51-100% is water cooling. This is adjusted by changing the parameter 309. -
Page 8: Window Contact
Then a closing signal is sent for as long time and the exercise is finished. Condensation detector There is a special input (CI) on STRA-24 controllers. This input is intended for Fläkt Woods condensation detector, STRZ-16, and functions internally as a digital input, i.e. -
Page 9: Parameter Settings
STRA-24 Installation and commissioning manual Parameter Settings STRA-24 is delivered with a number of factory settings. To acquire the desired function, the controller must be adapted to its 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-24 Installation and commissioning manual Parameter Description Values Unit FS STRA-24 number 0 = Disabled, 1 = Window contact, Connected sensor DI1 3 = P .I.R, 4 = Change over sensor 0 = Disabled, 1 = Window Contact, Connected sensor DI2...
- Page 11 STRA-24 Installation and commissioning manual Parameter Description Values Unit FS STRA-24 number 0 = Off, 1 = Unoccupied, 2 = Standby, BMS Operating Mode 3 = Occupied, 4 = Not Used, 5 = No Remote control Minimum airflow on cooling UO2 in % of 0-10V.
- Page 12 STRA-24 Installation and commissioning manual Parameter Description Values Unit FS STRA-24 number 0 = Disable, 5 = CO AI2 Input 7 = 0-100% , 8 = Flow calculation, 9 = 0-10V Flow at 0 volt on AI2 (Not in use)