Zehnder Option Box V2 Manuel De L'installateur page 29

Operation
The ventilation unit will control the 6b (power)
connector with the information received from the
6a (temperature sensor) connector.
The first two minutes after powerup of the
ventilation unit the sensor has not reached
the actual temperature yet to know if the sub-
soil heat exchanger valve needs to be opened.
Therefore the sub-soil heat exchanger valve will
remain closed for at least the first two minutes
after powerup of the ventilation unit.
When the ventilation unit is able to reach the
requested supply air without the assistance of the
sub-soil heat exchanger valve the sub-soil heat
exchanger valve will remain closed. If the sub-soil
heat exchanger valve gives a poor result on the
outdoor air temperature at the ventilation unit,
the ventilation unit will close the sub-soil heat
exchanger valve.
If the connection with the sensor of the sub-
soil heat exchanger valve is lost the ventilation
unit will close the sub-soil heat exchanger valve
and give the error GROUND_HEAT_CONNECT_
ERROR on the display of the ventilation unit.
12 Main power connector
If none of the 230 V accessories
are used, it is not necessary to
connect the device to the mains
voltage.
The following 230V ancillaries are powered by the
device:5
2
■ ComfoHood
■ ComfoFond-L pump;
■ Sub-soil heat exchanger valve.
1 Only available in Switzerland
valve;
All other functions are powered through the
ComfoNet of the ventilation unit with a maximum
of 150mA. The device is limited to deliver a
maximum of 10A to the powered 230V ancillaries
connections. Ensure all the connected devices do
not exceed these maximums.
13 ComfoNet connector
Each ComfoNet connector can be
connected to any ComfoNet device.
When you would like to connect more
ComfoNet devices than there are
available ComfoNet connectors,
install a ComfoSplitter.
The complete ComfoNet system is
limited to deliver a maximum of 150mA. If all
connected devices need more than 150mA you
need to install a powered ComfoSplitter.
Wiring diagram ComfoNet
14 Malfunction procedures
The device does not have a digital control system
that indicates malfunction codes.
The ventilation unit has a display that indicates
malfunction codes. The service manual of the
ventilation unit states what the malfunction codes
mean and how to rectify these malfunctions.
EN - 29