Sauter flexotron®800
ventilation
Functional description
P100012082
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A special analogue output signal, "Y1 Heating/Y3 Cooling", is used for Change-over
control. Switching between heating and cooling can be done in two ways. A digital
Change-over input signal is normally used. Open contact gives heating control and
closed contact gives cooling control. If the input has not been configured, change-over
is handled by the internal controller signal. The output signal will follow the two regular
output signals "Y1 Heating" and "Y3 Cooling". For heating control, the digital outputs
’’Heating Activate’’ and ’’Heat Step 1-4’’ are active. For cooling control ’’Cooling
Activate
’’ and ’’Cool Step 1-3’’ are active.
If frost protection sensor has been configured, it will function in the usual way when
heating is active. However, when cooling is active, it will only be used for indicating
temperature.
Three digital output signals, "Heat/Cool Step 1", "Heat/Cool Step 2" and "Heat/Cool
Step 3", are also connected with change-over. The signals can be used for reversing a
step controlled heating pump etc. See also section 5.1.4 Step controller Heating/ DX
cooling.
5.1.13
Extra temperature sensor
The input signals
’’Extra Sensor Temp 1’’, ’’Extra Sensor Temp 2’’, ’’...’’, ’’Extra Sensor
Temp 5
’’, can be used to add extra temperature sensors for supervision of
temperatures that are not related to any control functions. These sensors will only
generate sensor error alarms.
5.1.14
Extra flow sensors supply air and extract air
The input signals
’’Extra SAF Pressure’’ and ’’Extra EAF Pressure’’ can be used to
display the flow in the supply air and extract air ducts. The K- and X-constants for each
fan are used to calculate the flow.
5.2
Extra control circuit
An independent temperature control circuit for control of for example after-heaters. The
circuit can be configured to heating or cooling. It has an analogue input signal for
temperature sensors and an analogue output signal 0…10 V. There is also a digital
output signal which is activated when the analogue output signal is above 1 V and
deactivated when the analogue signal is below 0.1 V. The circuit can be configured to
be active all the time or to be active only when the main unit is running at normal speed.
5.3
Humidity control
General
Humidity control can be configured as Humidification, Dehumidification or both
Humidification and Dehumidification.
Two humidity sensors can be connected, a room sensor for control and an optional duct
sensor for maximum limiting. The limit sensor can be omitted.
The humidity control is handled by a PI-controller.
T
he humidity sensors must give 0…10 V DC for 0…100 % RH.
Humidification
An analogue output is used to control a humidifier. The output will increase on
decreasing humidity. A digital output can also be used to start a humidifier.
Dehumidification
An analogue output is used to control a dehumidifier. The output will increase on
increasing humidity. A digital output can also be used to start a dehumidifier.
Humidification/dehumidification
