11.1. OVERVIEW
Lowering temperature cycle by setting frost protection during ventilation of a room by an opened
window. You can access the open window detection from the Comfort, Eco and Auto modes.
Two ways to enable the detector:
– Manual activation, the cycle of lowering temperature starts by pressing a button.
– Automatic activation, the lowering temperature cycle starts as soon as the device detects a
temperature change.
11.2. MANUAL ACTIVATION
By pressing
for more than 5 seconds, the device will switch on Frost
Protection mode.
By pressing one button, you stop the Frost Protection mode.
If a temperature rise is detected, the device may return to the
previous mode (active mode before the open window detection).
11.3. AUTOMATIC ACTIVATION (FACTORY SETTINGS)
To disable this mode,
see ‘13. User settings’
The device detects a temperature fall. An opened window, a door to the outside, can cause this
temperature fall.
The difference between the air from the inside and the outside must cause a significant tempera-
ture fall to be perceptible by the device. This temperature drop detection triggers the change to Frost
Protection mode.
11.4. FROST PROTECTION DIGITAL METER
When the device performs a lower temperature cycle due to an opened window, a meter appears on
the display to show the cycle time. The counter is automatically reset at the next time to Frost Protec-
tion by an opened window (automatic or manual activation).
12. PRIORITIES BETWEEN DIFFERENT MODES
In Comfort, Eco and Frost protection mode, only orders of the open window detection will be consi-
dered.
In Auto mode, the device can receive different orders coming from:
– 7 day and daily programming integrated (Comfort or Eco orders)
– 6-order pilot wire, if conneccted to central control unit
– Open window detection
In general, it is the lowest received order which prevails except when the pilot wire is connected to an
energy management system, in this case the orders of the pilot wire take priority.
– If an open window is detecting, switching to Frost Protection takes precedence unless a load
shedding order is present on the pilot wire.
– The Boost activation will take precedence over other orders received except when the standby
(stop) order is present on the pilot wire, the device will switch off and the Boost will not be acti-
vated.
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Summary of Contents for HEDW.094040
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