Trox Technik FSL-CONTROL II Installation And Configuration Manual page 21

Recommended
Select free heating for the following operating
modes:
– Unoccupied
– Standby
– Occupied
3.1.2.7.8 Night purge
In the summer months (can be configured; factory set-
ting: May to September), the night purge function allows
for the building to be cooled during the nights, which is
energy efficient. This function requires that the optional
real time clock (RTC) is used. If no RTC is used, oper-
ating modes must be changed by the central BMS.
Saving energy
Night purge provides a high energy savings potential
since rooms can be 'pre-cooled' at night without
using a cooling coil.
Recommended
Highest fan stage
3.1.2.7.9 Filter change alert
The 'Monitoring filter replacement interval' function (i.e.
filter change alert) alerts users in each of the following
cases that a filter change is due:
The number of operating hours exceeds the preset

value (factory set to 2500 h, adjustable)
The differential pressure at the outdoor air filter

exceeds the preset value (only for unit variants *-HE
and *-HV)
Type of alarm:
Analogue control panel - LED double blinking
Digital control panel -
FSL-CONNECT - 'Next filter replacement in 0 h'
Note: If the differential pressure at the outdoor air filter
exceeds the maximum pressure, the 'Next filter change'
counter is reset to 0 h.
symbol
message
Single room control system FSL‑CONTROL II
Control of ventilation units
FSL‑CONTROL II > Functional description
Differential pressure monitoring
The ventilation units (master) variants *-HE and *-HV
come with a differential pressure monitoring function.
This function monitors the differential pressure of the
outdoor air filter up to the nominal air volume (usually
stage 3) If the differential pressure exceeds the preset
value for at least 30 minutes, the filter change alert is
activated (see above).
Differential pressure monitoring is not active in operating
modes 'boost' and 'night purge' in order to avoid unnec-
essary filter changes.
Filter checks
Differential pressure monitoring is not supposed to
replace any regular checks of the outdoor air filter or
checks due to hygiene reasons.
Resetting the filter change alert
You have to reset the number of operating hours after
each filter change. To do so, either keep the occupancy
push button on the room control panel pressed for at
least 10 s or use the FSL-CONNECT software
Ä 33).
(
3.1.2.7.10 Enforced fan activation
Fan activation is enforced by a signal sent to a digital
input. Outdoor air flow rate and exhaust flow rate can be
configured separately.
Fume hoods or fume cupboards can extract high air
volumes in classrooms and similar rooms. Enforced
fan activation can help to achieve balanced volume
flow rates.
21