flakt woods STRA-07 R Manuel
STRA-07 Room Controller. Installation and maintenance manual.
Fläkt Woods 8713 GB 2014.04 1 Specifications are subject of alteration without further notice.
Content STRA-07 for Fancoils
Installation preparations................................2
Controller/Display handling.........................5
Technical data..................................................5
Installation.......................................................6
Configuration..................................................6
Operating modes............................................7
Activation operating modes.........................7
Control states..................................................8
Actuators.........................................................9
Fan control.......................................................9
Forced ventilation/Condensation detector/
Frost protection..............................................10
Parameter settings.........................................10
STRA-07 Room Controller. Installation and maintenance manual.
Fläkt Woods 8713 GB 2014.04 2 Specifications are subject of alteration without further notice.
STRA-07 for Fancoils
Installation instruction
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.
1.
2.
3.
alt.
4.
5.
Dimensions
Dimensions in mm
STRA-07 Room Controller. Installation and maintenance manual.
STRA-07 for Fancoils
Fläkt Woods 8713 GB 2014.04 3 Specifications are subject of alteration without further notice.
Wiring
STRA-07 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.
All units that share the same transformer and
communication loop must use the same transformer-
pole for G (terminal 10) and G0 (terminal 11). On the
communication loop the A-terminal (terminal 42) should
only be connected to another A-terminal and the B-
terminal (terminal 43) to another B-terminal. Otherwise,
there is great danger of short-circuit with damaged
components as a result.
Inputs
AI PT1000-sensor, 0...50°C, accuracy +/- 0.1°C
UI AI: PT1000-sensor, 0...100°C, accuracy +/- 0.2°C or
DI: see DI below
CI Fläkt Woods’s condensation detector, STRZ-16
DI Closing potential-free contact connected to +C in
one end
Outputs
DO 24 V AC, max 0,5 A
UO DO:24 V AC, max 2.0 A or AO:0.5...10 V DC, max
5 mA +C, power output for DI only...24 V DC,
max 10mA, short circuit protected
STRA-07 Room Controller. Installation and maintenance manual.
Fläkt Woods 8713 GB 2014.04 4 Specifications are subject of alteration without further notice.
Terminal Designation Operation
10 G Supply voltage 24 V AC
11 G0 Supply voltage 0 V
12 D01 For forced ventilation, low speed. 24 V AC output, max 0,5 A. 24 V AC actuator is connected between terminal 12
and terminal 20, GDO.
13 DO2 For forced ventilation, average speed. 24 V AC output, max 0,5 A. 24 V AC actuator is connected between terminal
13 and terminal 20, GDO.
14 D03 For forced ventilation, high speed. 24 V AC output, max 0,5 A. 24 V AC actuator is connected between terminal 13
and terminal 20, GDO
20 GDO 24 V AC out common for DO. Internally connected to terminal 10, G.
21 G0 0 V common for UO. Internally connected to terminal 11, G0.
22 D04 For forced ventilation, 24 V AC output, max 0,5 A. 24 V AC actuator is connected between terminal 22 and terminal
20, GDO
23 UO1 Control of heating (FS) or cooling via change-over.
For 0...10 V DC valve actuator, max 5 mA (FS). The valve actuator’s 0…10 V control signal terminal is connected to
terminal 23 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to
the correct terminal on the actuator.
alternative
For 24 V AC thermal actuator, max 2,0 A. The thermal actuator is connected between terminals 23 and 20, GDO.
On the display, go into the parameter menu and change parameter 20 to thermal actuator.
24 UO2 Control output heating or cooling (FS).
For 0...10 V DC valve actuator, max 5 mA (FS). The valve actuator’s 0…10 V control signal terminal is connected to
terminal 24 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to
the correct terminal on the actuator.
alternative
For 24 V AC thermal actuator, max 2,0 A. The thermal actuator is connected between terminals 24 and 20, GDO.
On the display, go into the parameter menu and change parameter 20 to thermal actuator.
30 AI1 For external room sensor, PT1000. Measuring range 0...50°C. Sensor is connected between terminals 30 and 41,
AGnd.
31 UI1 For switching between heating and cooling on a two-pipe system (Change-over). PT1000-sensor is connected
between terminals 31 and 41, AGnd. Measuring range: 0...100°C. alternatively For potential-free contact. A potential-
free contact is connected between terminals 31 and 40, +C.
32 DI1 Occupancy detector. A potential-free contact is connected between terminals 32 and 40, +C. Closed contact
corresponds to occupancy.
See also section Occupancy detector in the section Operating modes.
33 DI2/CI Fläkt Woods’s condensation detector, STRZ-16 (FS). The sensor is connected between terminals 33 and 41, AGnd.
alternative
Window contact (DI). A potential-free contact is connected between terminals 33 and 40, +C. Closed contact
indicates closed window.
40 +C 24 V DC out common for DI and UI (with digital function)
41 AGnd Analogue ground, reference for AI and UI (with analogue function)
42 A RS-485-Communication
43 B RS-485-Communication
STRA-07 Room Controller. Installation and maintenance manual.
STRA-07 for Fancoils
Fläkt Woods 8713 GB 2014.04 5 Specifications are subject of alteration without further notice.
Plug-in of relay-box STRZ-14 to fan coil unit
QFDK, mounted in ceiling
Plug-in of condensation detector
Plug-in of relay-box STRZ-14 to STRA-07
STRA-07 Room Controller. Installation and maintenance manual.
STRA-07 for Fancoils
Fläkt Woods 8713 GB 2014.04 6 Specifications are subject of alteration without further notice.
Display handling
The display has the following indications:
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 Occupancy button.
Set point
In Occupied mode, the controller operates from a heating
setpoint (FS = 22°C), or a cooling setpoint (FS = 24°C) that
can be changed using the INCREASE and DECREASE
buttons.
Pressing on INCREASE increases the current setpoint by
0.5°C with each press up to the max. limit (FS = +3°C).
Pressing on DECREASE decreases the current setpoint by
0.5°C with each press down to the min. limit (FS = -3°C).
Switching between heating and cooling setpoints is done
automatically in the controller depending on the heating
and cooling requirement.
Fan control
Fan control STRA-07 has a fan button. When you press
the button, a symbol is shown in the display for 10
seconds. During this time, it is possible to change the fan
speed using the INCREASE/DECREASE buttons. The
controller has the following positions:
Auto Automatic control of the fan
speed to maintain desired
room temperature.
0Fan Off.
IManual position with low
speed.
II Manual position with
medium speed.
III Manual position with high
speed.
In operating modes Off and Unoccupied, the fan is
stopped, regardless of the setting in the display.
STRA-07 Room Controller. Installation and maintenance manual.
Fläkt Woods 8713 GB 2014.04 7 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
Material, casing Polycarbonate, PC
Weight 110 g
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 PT1000-sensor, 0…50°C. Suitable sensor is Fläkt Woods STRZ-05
Occupancy detector Closing potential-free contact. Suitable occupancy detector is Fläkt Woods STRZ-09.
Condensation detector alt. window contact Fläkt Woods condensation detector STRZ-16 alt. window contact STRZ-38 resp. potential-free contact
CO2 sensor STRZ-18, CO2 sensor with built-in relay. Active sensor is also possible to use.
Outputs
Fan control 3 outputs for speed I, II and III respectively, 24 V AC, max 0.5 A
Forced ventilation 24 V AC actuator, max 0.5 A
Valve actuator alt. thermal actuator 2 outputs
Valve actuator 0…10 V DC, max 5 mA
Thermal actuator 24 V AC, max 2.0 A
Control Heating or cooling
Actuator exercise FS = 23 hours interval
Terminal blocks So-called lift type for cable cross-section 2.1 mm2
STRA-07 Room Controller. Installation and maintenance manual.
STRA-07 for Fancoils
Fläkt Woods 8713 GB 2014.04 8 Specifications are subject of alteration without further notice.
Configuration
The controllers are configured via the display through
setting the required parameters. See section Display
handling/Parameter menu. Different applications require
different parameters to be set.
Operating modes
STRA-07 has five different operating modes. Through the
occupancy button you are able to switch between three of
them. Occupied is the preset mode.
Off
Operating mode Off means that the controller is not
heating or cooling, and the fans are stopped. However,
the temperature must not drop below the set minimum
temperature (FS=8°C). If it does, the controller will start
heating, and (if a fan is used) start the fan whether it has
been manually stopped or not.
Display: The background lighting is not lit, and only OFF
is shown in the display.
Unoccupied
Operating mode Unoccupied means that the room where
the controller is placed is not used for an extended
period of time, for example during holidays or long
weekends. Both heating and cooling are disconnected
and the fans are stopped within a temperature interval
with configurable min/max temperatures (FS min=15°C,
max=30°C).
Display: The background lighting is not lit, but the
current room temperature (or setpoint depending on the
configuration) is shown in the display. OFF is also shown
in the display.
Stand-by
Operating mode Stand-by means that the room is in
an energy save mode and is not used at the moment.
This can be during nights, weekends, evenings etc.
The controller is prepared to change operating mode
to Occupied (comfort) if someone enters the room
(presence). The room temperature is controlled around
the applicable heating and cooling setpoints, with
an extended temperature interval (FS=+/-3°C). For
example, if the heating setpoint=22°C and the cooling
setpoint=24°C, the controller will allow the temperature in
the room to be between 19°C and 27°C. The setpoints can
also be adjusted +/- 3°C via the display.
Display: the background lighting is lit (dimmed).
STANDBY and the current room temperature (or setpoint
depending on the configuration) are shown in the display.
Occupied
Operating mode Occupied means that the room is in
use and is therefore in a comfort mode. The controller
regulates the room temperature around a heating setpoint
and a cooling setpoint (FS heating setpoint=22°C, cooling
setpoint=24°C). The setpoints can also be adjusted +/- 3°C
locally via the display, or via a central command.
Display: the background lighting is lit (dimmed), and the
occupancy indication is shown (see the chapter Display
handling). The current room temperature (or setpoint
depending on the configuration) is also shown in the
display.
Bypass
Operating mode Bypass means that the controller controls
the room temperature in the same way as in operating
mode Occupied. The output for forced ventilation is
also active. After a configurable time (FS=2 hours) in
Bypass, the controller automatically returns to the preset
operating mode.
Bypass is normally activated when the Occupancy
button is pressed, via an occupancy detector or a central
command. The operating mode is useful for example in
conference rooms, where many people are present at the
same time for a certain period of time.
Display: the background lighting is lit (dimmed).
The occupancy indication and the symbol for forced
ventilation are shown (see the chapter Display handling).
The current room temperature (or setpoint depending on
the configuration) is shown in the display.
Activation of the different operating modes
Preset operating mode
Occupied is the preset operating mode. On models
without display the preset mode can be changed to Stand-
by using dipswitch SW3. OFF (FS): Occupied, ON: Stand-
by. This is configured in the parameter menu in the
display, parameter 45. The operating mode is changed at
the following events:
• When the Occupancy button is pressed (if the controller
has an Occupancy button).
• Activation/deactivation of an occupancy detector on the
digital input.
• CO2 value exceeded.
• Via central control, for example central time control,
central booking system etc.
Occupancy button
STRA-07 Room Controller. Installation and maintenance manual.
STRA-07 for Fancoils
Fläkt Woods 8713 GB 2014.04 9 Specifications are subject of alteration without further notice.
Shutdown
When the Occupancy button is held depressed for more
than 5 seconds, the controller changes operating mode to
”Shutdown” (Off/Unoccupied), regardless of the current
operating mode. Via the display , you can configure
which operating mode, Off or Unoccupied, should be
activated on ”Shutdown”. The factory setting is that
Unoccupied is activated.
If you press the Occupancy button for less than 5 seconds
when the controller is in operating mode Shutdown
or the preset operating mode, the controller changes
to operating mode Bypass. If you press the button for
less than 5 seconds when the controller is in Bypass, it
changes operating mode to the Preset operating mode.
After a configurable time in Bypass (FS=2 hours), the
controller returns to the preset operating mode.
For handling of the Occupancy button in combination
with central control, see the section Central control below.
Occupancy detector
For local control of the operating mode between the
preset operating mode and Bypass, an occupancy detector
is connected.
When occupancy is indicated, the controller changes
operating mode to Bypass. If you want to be able to
enter the room temporarily without activating Bypass,
for example to pick something up, you can configure a
powerup delay. This means that Bypass is not activated
until the power-up delay has expired. The Bypass delay
can be set to a value between 0 and 60 minutes (FS=0
min).
In Bypass on presence, there is a switch-off timer, which
means that if there is no occupancy indication during this
time (FS=10 min), the controller will return to the preset
operating mode.
Control states
The controllers can be configured for different control
states/control sequences:
• Heating
• Heating or cooling via the change-over function
• Heating/Heating
• Heating/Cooling
• Heating/Cooling with VAV-control and forced supply
air function
• Heating/Cooling with VAV-control
• Cooling
• Cooling/Cooling
For the control states, UO1 is used for the left control
function and UO2 is used for the right control function.
For control states where only one control function is
active (Heating, Heating or cooling via the change-over
function, and Cooling), only UO1 is used.
Heating
In control state Heating, the unit is always a heating
controller and controls according to the heating setpoint
plus/minus the setpoint displacement. The setpoint can be
adjusted in the display.
Heating or cooling via the change-over function
Like control state Heating but with change-over function,
i. e. when the change-over input is active, the controller
becomes a cooling controller and regulates according
to the basic cooling setpoint plus/minus the setpoint
displacement. See more in the section Change-over.
Heating/Heating
Split output signal
In control state Heating/Heating, the controller is always
a heating controller and controls according to the basic
heating setpoint plus the setpoint displacement. When
the controller output signal reaches 50%, it is divided
between two actuators. 0…48% of the signal is sent to
actuator 1 and 52…100% of the signal is sent to actuator 2.
See the figure below.
Heating/Cooling
In control state Heating/Cooling, the controller functions
as a heating controller when the room temperature
is lower than the basic heating setpoint plus half the
neutral zone. The neutral zone is the difference in
temperature between the heating setpoint and the cooling
setpoint. When the room temperature exceeds this limit,
the controller becomes a cooling controller. There is a
hysteresis of 0.1°C when the controller changes from
heating to cooling controller and vice versa. When the
controller is heating, it regulates according to the basic
heating setpoint plus the setpoint displacement, and
when it is cooling according to the basic cooling setpoint
plus the setpoint adjustment.
STRA-07 Room Controller. Installation and maintenance manual.
STRA-07 for Fancoils
Fläkt Woods 8713 GB 2014.04 10 Specifications are subject of alteration without further notice.
Cooling
In control state Cooling, the unit is always a cooling
controller and controls according to the basic cooling
setpoint plus the setpoint displacement.
Cooling/Cooling
Split output signal
In control mode Cooling/Cooling, the controller always
functions as a cooling controller and controls according to
the basic cooling setpoint plus the setpoint displacement.
When the controller output signal reaches 50%, it is
divided between two actuators. 0…48% of the signal is
sent to actuator 1 and 52…100% of the signal is sent to
actuator 2. See the figure below.
Actuators
STRA-07 can be used with two types of actuators:
• Analogue 0…10 V actuators
• Thermal actuators
The actuator type is set via the parameter menu in the
display.
Analogue actuators
The following output signals can be set for analogue
actuators:
• 0…10 V (FS)
• 2…10 V
• 10…2 V
• 10…0 V
Thermal actuators
When thermal actuator control has been selected, this
is controlled digitally with time proportional pulses
via output UO…. By pulsing, the opening degree of the
actuator (and its valve) is varied. The period time (in
seconds) is the sum of the on and off output times on the
output. The period time is FS=60s. The controller varies
the on and off output times proportionally depending on
the output signal demand to the actuator.
Actuator exercise
All actuators are exercised. The exercise takes place at
set intervals in hours (FS=23 hours interval). An opening
signal is sent to the actuator for as long time as the run
time has been configured. Then a closing signal is sent for
as long time and the exercise is finished.
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