Sauter flexotron®800
ventilation
Starting and stopping the unit
P100012082
54
6
Starting and stopping the unit
6.1
Start conditions
The unit will be started and will run when any one of the following conditions is met:
1. Timer output for normal speed or timer output for reduced speed is ON
2. The unit is started manually using the flexotron®800 front panel
3. Digital input for extended running is activated
4. Support control is activated and the present room temperature is higher/lower
than the preset starting value (Support heating/cooling)
5. Demand controlled ventilation is activated and the value at the CO2 sensor is
higher than the preset start condition.
6. Recirculation control has been configured and the conditions for recirculation
control are fulfilled.
Possibility to block automatic restart at power-up
The function
’’Automatic restart at power-up’’ makes it possible to block automatic
restart of the unit at power-up. At power-up, the B-alarm
’’Restart blocked after power
on
’’ is generated. Once this alarm has been acknowledged, the unit will start.
6.2
Stop conditions
The unit will be stopped when any of the following conditions are met:
1. Timer output for normal speed or timer output for reduced speed are OFF, and
the signal for extended running is OFF.
2. Activated frost protection alarm. The unit will restart on resetting of the alarm.
3. Activated fire detector if the function has been configured. The unit will restart
on resetting of the alarm.
4. If the unit has electric heating and the supply fan flow switch alarm or the high
temperature limit alarm is activated.
5. Activation of external switch.
6. The unit is stopped manually using the flexotron®800 front panel.
7. Support control is activated and the present room temperature is higher/lower
than the pre-set stop value (support heating/cooling)
8. Demand controlled ventilation is activated and the value at the CO
2
sensor falls
below the pre-set start condition less the set differential.
9. Recirculation control is active and the conditions for recirculation control are no
longer fulfilled.
10. At an activated alarm configured with the extra function of stopping the unit on
activation. The unit will restart on resetting of the alarm.
6.3
Start sequence
Start of the unit will run according to the following sequence:
1. If the controller is configured for water heating and has an outdoor temperature
sensor and the outdoor temperature is below +3ºC the heating valve is opened
and the heating circulation pump is started.
2. If the controller is configured with a heat exchanger and has an outdoor
temperature sensor and the outdoor temperature is below +15ºC the heat
exchanger will be run at 100% capacity for a pre-set time.
3. Signals for outdoor air and exhaust air dampers are activated.
4. The supply air fan or the control of the supply air pressure will be started after a
preset time.
5. The extract air fan or the control of the extract air pressure will be started after
a preset time.
6. Thereafter temperature control according to the configured control mode is
started. Electric heating, if configured, is not started until a run signal from the
