Orcon WTU-1000-EC-E, Инструкция по установке и эксплуатации

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This function is used during the hot summer period to cool the building at
night with the colder outside air. For this, the 'Summer night ventilation'
function must be set to 'Active' in the programme menu:
Step 1 Log in as Admin (code 1111)
Step 2 Go to: 'Configuration -> 'Z/N ventilation' -> 'ZNV active: No'.
Step 3 Change 'No' to 'Yes'.
Summer night ventilation will only be activated if the following starting conditions are
met:
• Less than 4 days have passed since the WTU was last in operation.
• The outside temperature during the previous operating period was higher
than a set limit (e.g. +22 °C).
• The current time is between two adjustable times (e.g. 00:00 and 07:00).