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Zehnder Eversky
16. Troubleshooting - Maintenance
16.1. Supply air filter pressure switch (fresh air) DEPFS
16.1.1. Setting the tare
The condition of the supply air filters (fresh air) is continuously monitored by an air
pressure switch which informs the controller of the pressure drop. When the filter
pressure drop exceeds the pressure switch setting, the controller informs the user by
means of a warning.
The user settings ex-works are identical to the factory settings. If the restoration of user
settings is called and no prior backup has been made, the restored settings will be the
factory settings.
16.1.2. Electrical connections
The pressure filters are of type NO (normally open). The contact is open at rest and
closes when the pressure drop of the filters (differential pressure) is higher than the
setting (200 Pa ex works).
The pressure switch must be connected between terminals (1) and (3) according to the
electrical wiring diagram.
16.1.3. Air connections
In the event of replacement or removal of the component, the air connection must be respected during re-installation as
described in the table below:
Fresh air
Filter pressure switch:
- Tube in P1(-)
- P2 (-) left free
