STRA-04 Room controller. Installation and maintenance manual.
STRA-04 for Optivent
Fläkt Woods
6
Specifications are subject of alteration without further notice.
Operating modes
STRA-04 has five operating modes. The Function button
can be used to switch between three of them. These
operating modes can be set via the parameter menu
(parameter 45) in the display. Occupied is the preset
operating mode.
Off
Operating mode Off means that the controller is inactive
(heat and cooling are disconnected). However, the
temperature must not drop below the set minimum
temperature (parameter 6, FS=8°C). If the room
temperature drops below the minimum temperature, the
controller will start heating.
On the display, the background lighting is not lit, and
only OFF is shown.
Unoccupied
The Unoccupied operating mode is an energy-saving
mode. This means that the room controlled by the
controller is currently not in use, or is not used for long
periods, e.g. during evenings, nights, weekends or by non
presence when using occupancy sensor. Both heating and
cooling are disconnected within a temperature interval
with adjustable min./max. temperatures (Parameters 4
and 5, FS min=19°C, max=27°C).
The background lighting is not lit on the display, but the
current room temperature (or setpoint, depending on the
configuration) is shown. OFF is shown on the display in
this case too.
Stand-by
The Stand-by operating mode means that the room is in
energy save mode and not currently in use, e.g. during
nights, weekends or evenings. This mode is currently not
used by default settings from Factory but it can be used
instead of unoccupied mode by non presence when using
occupancy sensor. 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 is 22°C and the
cooling setpoint is 24°C, the controller will allow a
room temperature between 19°C and 27°C. In addition,
the setpoint values can be locally ad/- 3°C via
a setpoint knob or via the display on the room unit.
Display: background lighting is lit (dimmed) and
STANDBY, and current room temperature (or setpoint,
depending on configuration) is shown on the display. For
further information, see Occupancy Control section.
Occupied
The Occupied operating mode means that the room is
in use and is adjusted according to Comfort mode. The
controller adjusts the room temperature around a heating
setpoint and a cooling setpoint (Parameters 1 and 2,
FS heating setpoint=22°C, cooling setpoint=24°C). The
setpoint values can also be locally ad/- 3°C via the
display on the unit, or via a central command.
On the display, the background lighting is lit (dimmed)
and the occupancy indicator is lit (see Display Handling
section). The current room temperature (or setpoint
depending on the configuration) is shown.
Bypass
The Bypass operating mode means that the controller
adjusts the room temperature in the same way as in the
Occupied mode. The output for forced ventilation is also
activated (10V cooling output UO2). After a configurable
time (Parameter 12, FS=60 minutes), the controller
automatically returns to Preset mode. Bypass is normally
activated by pressing the Function button, the occupancy
detector (depending on the configuration), or via a central
command. This operating mode is useful in conference
rooms where many people are present simultaneously for
a limited period of time.
The background lighting on the display is lit (dimmed).
The occupancy detector and the symbol for forced
ventilation are lit (see Display Handling section). The
current room temperature (or setpoint, depending on the
configuration) is shown.
Activation operating modes
Preset operating mode
Occupied is the preset operating mode. The desired
operating mode is configured in the parameter menu on
the display (parameter 45). The operating mode in the
room controller is changed if the following commands/
events occur:
• When the Function button is pressed
• When the occupancy detector is activated/deactivated
• When the CO value on the
2
analogue input is exceeded
• If central control is used, e.g. central time control or
central booking system.
Function button
Bypass
(Forced ventilation)
Button/Timer
Occupied
(Preset operating mode)
Shutdown
(Unoccupied)
> 5 s
Shutdown (Off or Unoccupied)
If the Function button is pressed and held for more than
5 seconds, the controller switches to Shutdown mode,
which may be Off or Unoccupied regardless of the current
operating mode The activated operating mode, Off or
Unoccupied, is configured via the display. The factory
configuration is Unoccupied.
8790 GB 2016.03
8790 GB 2016.03
