Trox Technik FSL-CONTROL II Installation And Configuration Manual page 19

Unoccupied
– This operating mode is used to protect the
building; it is required for night purge.
– Air quality control is not possible with this oper-
ating mode.
Boost
The 'Boost' mode is used for the quick ventilation of
rooms. This mode can be used, for example, to ventilate
a classroom during breaks.
The following parameters can be set:
Fan stage

The same comfort temperature range and supply air
temperature limits as for the 'Occupied' mode are
used.
You can enable 'Boost' mode using the room control
panel.
3.1.2.7 Functions
The following functions of FSL‑CONTROL II are factory
set, based on the project-specific requirements. If nec-
essary, the TROX Technical Service can change the
factory settings at a later stage.
3.1.2.7.1 Summer and winter compensation
With summer compensation and winter compensation
the comfort temperature range is automatically adjusted
based on the outdoor air temperature.
Fig. 16: Summer/winter compensation, example
Recommended
Winter compensation enabled, summer compensa-
tion disabled
Single room control system FSL‑CONTROL II
Control of ventilation units
FSL‑CONTROL II > Functional description
3.1.2.7.2 Minimum fan stages
Setting minimum fan stages allows for enforced ventila-
tion in all operating modes. The software can be used to
select the minimum fan stage (0 to 5, if any).
Recommended
– Occupied – fan stage 1
– Standby – fan stage 0
– Unoccupied – fan stage 0
3.1.2.7.3 Secondary air function
If the room air quality is good, FSL‑CONTROL II X-AIR-
CONTROL switches to secondary air mode, which is
more energy efficient. The shut-off dampers are closed
and the supply air fan remains switched on.
The control system compares the room air quality limit
value to the ACTUAL values measured by the
VOC sensor and switches automatically between out-
door air and secondary air mode. The ventilation unit
starts always in secondary air mode.
Secondary air mode is an option and only possible with
air quality measurement (integral function or central
BMS). The secondary air function is not available for all
unit variants.
Recommended
Limit value: 600 ppm
3.1.2.7.4 Frost protection
Room temperature frost protection
FSL‑CONTROL II provides frost protection for the con-
trolled rooms. Room temperature frost protection
depends on the measured room temperature. If the
room temperature falls below a set limit, the frost pro-
tection function is activated. This means that the heating
valve opens completely, the fans are switched off, and
the dampers close. The module will not return to its pre-
vious configuration until the room temperature has
increased to at least 1 K (can be configured) above the
room temperature frost protection limit.
Recommended
Room temperature limit: 8 °C
Supply air temperature frost protection
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