Sauter flexotron®800
ventilation
Functional description
P100012082
40
In- and outputs
Heating Cooling Heating/Cooling
Change-over
DO
DO
DO
Step controller, step 1 (optional)
DO
DO
DO
Step controller, step 2 (optional)
DO
DO
DO
Step controller, step 3 (optional)
DO
Step controller, step 4 (optional)
Override of reduced speed for DX cooling
Override to normal quantity of air for DX cooling when the unit runs on reduced quantity
of air. The fans can be set to normal operation when cooling is required at high outdoor
temperatures (e.g. >14°C, the same temperature limit as for blocking of DX cooling).
5.1.5
Support control
Support control is normally used when room temperature control or extract air control
has been configured. When extract air control is configured a room sensor must be
installed.
‘‘Support control Heating’’ or ‘‘Support control Cooling’’ will run if Support
control is configured, the running mode is in Off-state (timer control OFF and not in
extended running) and if conditions call for support control (see below). Minimum run
time is settable 0 to 720 minutes (FS= 20 minutes).
Support control can also be configured when supply air temperature control is used, if a
room sensor is installed. The controller uses the configured min. (FS=15°C) and max.
(FS=30°C) limitation values as support control setpoints. However, in this case the min.
and max. limitation values cannot be changed. To change the values, temporarily
configure room control, change the min. and max. values and then change back to
supply air control.
Support control can also be configured to start only with the supply air fan. In this mode,
the extract air fan is not active. This requires a digital output to be configured, which
controls the recirculation damper to open completely so the supply air fan can circulate
the air to and from the room. The digital output is called
’’recirculation damper’’.
Support control heating
Demand for support control heating is when the room temperature is lower than the
start value which is settable 0 to 30°C. The fans will run at the preset speed, the heater
and the heat exchanger are controlled by the supply air temperature controller with the
configured max limitation for the supply air (FS=30°C) as setpoint and the cooling is
shut off (0%). Support control heating stops when the room temperature rises to the
stop value and the minimum run time has been exceeded or the running mode changes
to
’’On’’.
Support control cooling
Demand for support control cooling is when the room temperature is higher than the
start value which is settable 20 to 50°C. The fans will run at the preset speed, the
heater and the heat exchanger are shut down (0 %) and the cooling is controlled by the
supply air temperature controller with the configured minimum limitation (FS=15°C) as
setpoint. Support control cooling stops when the temperature falls below the stop value
and the minimum run time has been exceeded or the running mode changes to
’’On’’.
