Zehnder EASY 5.0
20
13.2. Priorities for time periods and external controls
Where time periods overlap, the following should be considered:
■
When a reduced operation time period and a normal operation time period overlap, the normal operation time period
has priority over the reduced operation time period
■
When there is no active operation, i.e. when neither the reduced nor the normal operation is active, the ventilation unit
is switched off
■
If the ventilation unit is stopped, it can be started if the night cooling function is allowed to operate in the set operating
time range (00:00 - 07:00 factory setting)
■
The night cooling function can only operate if the ventilation unit is:
■
In reduced operation
■
Stopped via time schedules (no active time schedules).
External controls have priority over time period programming. If the ventilation unit:
■
Operates in the normal operation time schedule and the external forced operation in reduced operation is activated,
the ventilation unit will operate in reduced operation
■
Operates in the reduced operation time schedule and the external forced operation in normal operation is activated,
the ventilation unit will operate in normal operation
■
Is off (no active time schedule) and the forced running in reduced (or normal) operation is activated, the unit will
operate in reduced (or normal) operation the whole time the forced running in reduced (or normal) operation is
activated
■
Is operating in the reduced (or normal) operation time schedule and the external forced operation is activated, the
ventilation unit will be switched off.
The night cooling function will only be started if:
■
The time schedule that covers the cooling period is the reduced operation
■
Or the ventilation unit is stopped by the time schedules (no active time schedule)
■
And there is no demand for an external forced operation.
Due to the risk of internal deterioration of the fan unit and clogging of the pressure tap tubes by condensation, it is
generally not recommended to have shutdown phases, especially because:
■
These shutdown phases are short and repeated
■
The exhaust air is humid
■
The machine is installed outdoors, in a cold region, and without isolation registers.
For these reasons, it is recommended to have at least the reduced operation period permanently active (setting 00:00 -
24:00).
The diagram below summarises the operating logic for the following time schedule setting:
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
