Zehnder ComfoAir 70 Instructions De Montage page 11

Control characteristic
When using the Automatic
function, the fans for the unit
are controlled subject to the
concentration of the measured
variable being detected.
The PCBs of the VOC sensor
system module and the CO2
sensor system module are also
fitted with a combined humidity/
temperature sensor and each
generate two sensor signals, which
can be configured separately via
a DIP switch. If both are in the ON
position, the fans follow the control
characteristic of the automatic
function with the higher sensor
signal.
DIP switch no.
1 2 3
ON OFF OFF
ON ON OFF
OFF ON OFF
OFF ON OFF
ON ON OFF
Tab.2: Sensor system modules with various DIP switch positions
* Note: DIP switch no. 3 is used to configure the Boost ventilation function
The Bathroom function activates
the maximum fan speed from
a relative humidity of 80%. This
special control characteristic is
only executed if the HUMIDITY
control Automatic function has
been configured.
Automatic function
The four-pin DIP switch MODE
SW1 is used for the configuration
of the designated Automatic
function for the respective sensor
system module (Tab.2).
Activated Automatic function
4
VOC / CO2 control
OFF
VOC / CO2 control and HUMIDITY control
OFF
HUMIDITY control
OFF
HUMIDITY control with Bathroom function
ON
VOC / CO2, HUMIDITY control with Bathroom function
ON
Sensor system
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