Installation Manual Serena Series
4.0 ERV Operational Modes Functionality
O Mode
ERV fans are o. Defrost damper is closed (if equipped) to prevent cold air from entering the unit.
Normal Mode
In Normal mode ERV fans run and the unit exchanges indoor air with outdoor air. The airflow exchange can be adjusted in four
preset airflow values. Normal Mode is intended to be requested by the user for long time ERV operation.
High Ventilation Mode
In High Ventilation Mode the ERV fans run and the unit exchanges indoor air with outdoor air, as in Normal Mode, but the airflow
level is much higher. High Ventilation Mode is intended to be requested by the user if he/she requires quick air exchange in the
house.
Energy Saving Mode
The ERV will switch to Energy Saving Mode when it is requested by the User, from the Wall Mount Unit. In Energy Saving Mode
the ERV will automatically run in Auto mode 20 minute per every 4 hours. The rest of the time the unit will stay in OFF mode.
The defrost damper is closed to prevent cold air from entering the unit and the first running will start immediately after the ERV
was set to Energy Saving mode.
Defrost Mode
The unit automatically switches to Defrost mode, when the supply air is below 5°C(41°F), and returns to the last requested mode
when the outdoor air temperature becomes above 15°C(59°F). While defrosting, the exhaust fan runs in High Ventilation Mode
with supply fan shutting o and damper closed. Supply temperature is measured by a temp. sensor located in the ERV supply air
discharge duct. The Defrost Mode is an automatic mode which cannot be enabled/disabled by the user.
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