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Boost
The boost mode can be used to force the supply and extract
airflow to a higher setpoint, when specific conditions are met.
The boost mode can be activated with a contact connected to
the digital input IN9 or by an analogue 0...10V control signal
connected to input K3. The boost setpoint is preset in (l/s,
m³/h).
Setting
Settings
Factory
range
setting
Supply / Extract airflow
0...max
Boost activation on
Contact
Contact
RH
RH on / off
0...100%
60% / 40%
Vmin/max RH on K3
0...10V
2,0V / 9,5V
RH ~Vmin/max
0...100%
2% / 95%
Post ventilation
The post ventilation function is used to keep the fans running
during a specified laps of time. This function is activated au-
tomatically when an electrical heating coil is activated.
Setting
Settings
Factory
range
setting
Activation
No
No
Yes
Time
0...9999sec
90sec
24
ADVANCED SETUP
DEACTIVATE SOFTSTOP
TEMPERATURE
BOOST
POST VENTILATION
EXTERNAL COILS
ADVANCED SETUP
TEMPERATURE
BOOST
POST VENTILATION
INTERNAL COILS
EXTERNAL COILS
Operation and maintenance
instructions – CLASS UNIT TAC5
Internal coils
Electrical postheating coil
The electrical postheating coil is installed and configured
in factory. The electrical postheating coil will always have
its separate power supply and main switch. The capacity of
the coil will be controlled proportionally in order to keep a
temperature as defined by the selected operating mode.
Setting
Settings
Factory
range
setting
Control mode
Exhaust
Supply
Supply
Setpoint
-9,9...99,9°C
21,0°C
PID - Proportional Band
0...100
5
PID - Integral
0...100
30
PID - Derivate
0...100
11
Frost protection
Frost protection plate heat exchangers
In environments where the extract air can occasion-
ally be humid, the defrosting function can be activated
to protect the heat exchanger from frosting. There are
four strategies: down control of the supply air volume,
modulating by-pass control, modulation of capacity of
a pre-heating coil, differential pressure measurement
(cold climate option). If non of these measures are effec-
tive, the air handling unit can be stopped by limting the
minimal supply air temperature. When the Frost protec-
tion cycle is active, it will be indicated on the HMI. The
configurable temperatures are exhaust temperatures.
Frost protection cycle active
Frost protection alarm
Setting
Settings
Factory
range
setting
T° Low
1...3°C
+1,0°C
T° High
1...5°C
+5,0°C
Stop supply airflow
No
Yes
Yes
Operation and maintenance
instructions – CLASS UNIT TAC5
ADVANCED SETUP
BOOST
POST VENTILATION
INTERNAL COILS
EXTERNAL COILS
INTERNAL COILS
25
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