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Domestic ventilation unit M Flex Air (Plus)
9
Operating functions
9.1 Internal air quality sensors
The air quality sensor is only active in Automatic mode (for
function, see cap. 8.2 Operating modes - Automatic mode).
9.2 Preheating register (optional)
The optional electric heating register can be used for preheat-
ing the outside air.
HINWEIS
NOTE
A preheating register must be used if:
- a fireplace is installed in the ventilated residential unit
- the ventilation unit is installed in a passive
house.
Preheating the outside air in extremely cold temperatures pre-
vents the heat exchanger from icing up and therefore also
avoids defrost mode. The ventilation unit works continuously in
heat recovery mode and is therefore efficient.
9.3 Post-heating register (optional)
The optional electric supply air heating register can be used for
post-heating the supply air.
This provides greater comfort at low outside air temperatures in
the supply air areas.
9.4 Filter monitoring
The filter monitoring is time-controlled. A filter signal provides a
filter maintenance reminder as a text notification and flashing in
the display after the set interval time has elapsed. The filter sig-
nal is configured in the user menu under 20 - Settings / 21 Filter
time.
The filter time can be set in a range of 2 - 6 months. The factory
setting is 6 months.
Filter monitoring is also carried out by monitoring of the volume
flows. If the actual volume flow varies from the set volume flow
by a predefined amount, filter maintenance is indicated by a
text notification and flashing in the display. The characteristic
curve for filter pressure monitoring is taught in using the user
menu under 30 Parameter - 31 Status signal - 315 Filter signal
by resetting the filter time (press OK for approx. 2 seconds).
"Filter Calib." appears in the basic display.
Filter reset with active filter signal
Acknowledge / reset the signal by pressing the OK key in the
basic display and restart the interval time.
Filter reset without filter signal
Restart the interval time in the user menu under 30 - Parameter
/ 31 - Status signal in the display 315 - Filter signal by pressing
the OK key.
HINWEIS
NOTE
In the event of a power failure or if the ventilation unit is
switched off, the filter time is not reset.
HINWEIS
NOTE
Acknowledge / reset the signal by pressing the OK key in the
basic display.
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9.5 Switch off limit
It is possible to limit the time for which the ventilation unit is
switched off (without completely blocking the switch off func-
tion). The setting is made in the service menu under 20 - Set-
tings / ? 28 Filter mon.
This enables the ventilation unit to be temporarily shut down
(e.g. if there are odours in the outside air) but basic ventilation
for moisture protection is still assured.
When the set time has elapsed, the ventilation unit automati-
cally starts at speed 1 (reduced ventilation) of in automatic
mode if an air quality sensor is connected.
In the factory settings, the switch off limit is deactivated (set-
ting 0 h), i.e. the ventilation unit can be switched off for an un-
limited time.
9.6 Bypass control
The bypass directs the outside air past the heat exchanger and
directly into the building. Heat recovery is deactivated. In sum-
mer, this function can be used to direct cool outside air (e.g. at
night) into the rooms.
The bypass can be controlled automatically and/or manually.
The bypass control is configured in the user menu under Set-
tings /
Automatic bypass control
If automatic bypass is activated in menu item 22, bypass con-
trol is carried out automatically depending on the outside air
and exhaust air temperature.
The target temperature corresponds to the defined comforta-
ble temperature (set in the heating menu (to be rewritten)).
Above the set temperature, the outside air is fed directly into
the building. Standard values are from 15 °C (bring cold into the
building as much as possible) to 25 °C (keep heat in the building
as much as possible).
The factory setting is +22 °C. If the ventilation unit is connected
to a System M or M Flex heat pump via an RS 485 Modbus con-
nection, whether the heat pump is in summer or winter mode is
taken into account.
The bypass opens (heat recovery is inactive) if all of the follow-
ing conditions are met:
Heat pump cooling operation is detected, or the ventilation
unit detects summer operation
Exhaust air temperature above comfortable temperature
Outside air temperature below comfortable temperature
The bypass also opens for heating operation (heat recovery is
inactive) if all of the following conditions are met:
Comfortable temperature above exhaust air temperature
Heat pump heating operation detected, or the ventilation
unit detects winter operation
Exhaust air temperature 2 °C below switching temperature
Outside air temperature 1 °C above switching temperature
DOK4SVxxDEN · FD 9912
22
Bypass.
English
31
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