STRA-04 Room controller. Installation and maintenance manual.
STRA-04 for Optivent
Fläkt Woods
7
Specifications are subject of alteration without further notice.
If the Function button is pressed briefly when the
controller is in Shutdown or Preset mode, the controller
will switch to Bypass mode. If the button is pressed
briefly when the controller is in Bypass, the operating
mode will switch to Preset.
After a configurable time in Bypass (FS=60 minutes), the
controller automatically returns to the preset operating
mode.
For further information on using the Function button in
combination with central control, see the Central Control
section below.
Occupancy detector
A STRZ-09-1 occupancy detector can be installed for
local control of the operating mode with regard to room
occupancy. If occupancy control is installed, parameter
45 should be changed to 1 = Unoccupied and parameter
17 changed to 3. This will achieve the function illustrated
in the picture above, where the activated occupancy
detector shifts to the Occupied operating mode. When the
occupancy sensor is deactivated, the controller returns to
the Unoccupied operating mode (to save energy).
Control
STRA-04 can be configured for different control states/
control sequences (Parameter 11, FS = 4 = Heating/Cooling
with VAV control and forced supply air function):
• Heating
• Heating/Heating
• Heating/Cooling
• Heating/Cooling with VAV control and forced supply
air
• Heating/Cooling with VAV control
• Heating
• Cooling/Cooling
For the control states, UO1 is used for the left control
function and UO2 is used for the right control function. If
only one control function is active (Heating or Cooling),
only UO1 is used.
Heating/Cooling with VAV control and forced air
supply
Same control function as for Heating/Cooling, except
cooling is controlled via a supply air damper (supply
air below min. temperature). In the event of forced
ventilation, the cooling controller (10V on cooling output
UO2) is set to full cooling (full supply air flow) regardless
of the controller output signal.
8790 GB 2016.03
