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.
