OPERATION
Settings
34
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P3 : Passive cooling operating mode
Effect
0
Passive cooling is permanently disabled. Air flows through the heat ex-
changer.
1
Passive cooling is enabled. The appliance checks whether a window con-
tact is connected and activated at X18
2
Passive cooling operates with summer day detection. This option is set in
the delivered condition.
3
Passive cooling operates subject to the extract air temperature.
Passive cooling is only activated when an opened window is de-
tected.
Note
The qualified contractor can set the parameters men-
tioned in the description of this parameter.
P24 : Passive cooling release temperature
P25 : Passive cooling blocking temperature
P26 : Passive cooling hysteresis
P27 : Temperature differential for enabling passive cooling
P3 = 2 : Passive cooling with summer day detection
In order for passive cooling to be enabled, the following must
apply for 2 hours: Outdoor air temperature > Set room temper-
ature + P27
If all of the following conditions are met, passive cooling switches
the appliance to extract air mode.
- Outdoor air temperature < Extract air temp. - P26
- Extract air temp. > Set room temperature
If one of the following conditions is met, passive cooling termi-
nates extract air mode.
- Outdoor air temperature < P25
- Outdoor air temperature > Extract air temp. - P26
- Extract air temp. < Set room temperature
P3 = 3 : Passive cooling subject to extract air temperature
In order for passive cooling to be enabled, the following must
apply for 2 hours: Extract air temp. > Set room temperature + P27
This delayed activation is intended to prevent cooling down in
spring and autumn.
If all of the following conditions are met, passive cooling switches
the appliance to extract air mode.
- Outdoor air temperature < Extract air temp. - P26
- Extract air temp. > Set room temperature
If one of the following conditions is met, passive cooling termi-
nates extract air mode.
- Outdoor air temperature < P25
- Outdoor air temperature > Extract air temp. - P26
- Extract air temp. < Set room temperature
P4 : Reset filter
f
f
Set this parameter to 1 after changing the filters. The appli-
ance resets the filter runtime to 0. This parameter is auto-
matically reset to 0.
P28 : Enable fan
You can switch off the fans at any time via the programming unit
menu, e.g. to deactivate ventilation if there is a fire.
Effect
OFF The fans are deactivated. "OFF" and the fan icon flash on the display.
On The fans are enabled.
P80 : Day
1
Monday
2
Tuesday
3
Wednesday
4
Thursday
5
Friday
6
Saturday
7
Sunday
P83 : Mode of backlighting
Effect
On
Backlighting switched on
OFF Backlighting switched off
Auto
If no user action occurs within the time selected in the illumination du-
ration parameter, the display backlighting switches off and the standard
display appears.
P84 : Illumination duration
If no user action occurs within the time selected in the illumination
duration parameter, the display backlighting switches off and the
standard display appears.
P85 : Lower standard display
Use this parameter to define what is displayed in the lower section
of the standard display. If the appliance detects a fault, the fault is
indicated in the lower section of the standard display.
4.5.2 Actual values
Description
Unit
I1
Passive cooling status
I2
Extract air temperature
°C
I3
Relative humidity of extract air
%
I4
Filter service life
h
I5
Appliance software version
I6
Unit software patch
I7
Terminal device serial number
I8
Programming unit software version
I70-79 Fault memory
Faults detected by the appliance are stored in actual values I70
to I79.
The latest fault is stored in I70; the oldest in I79. If no faults are
entered, dashes are shown. The latest fault is also shown in the
lower section of the standard display. Possible faults are listed for
qualified contractors in the "Troubleshooting" chapter.
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