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• With Preheating Hydronic Coil
As an alternative to the use of an electric pre-
heating resistance, a hot water pre-treatment coil
can be used to perform the antifreeze function,
mounted on the fresh air intake duct.
The hydronic coil is not available as an accessory,
however the power board is able to manage the
opening of an ON-OFF valve equipped with a solid
state relay controlled by the digital output signal,
contact "3-4"
of the ventilation unit power board
(see POWER BOARD diagram).
In this case the "HEAt" setting must be combined
with the specific configuration of the "DGTO" menu
UNITS
FITTED
WITH
ANTIFREEZE
SYSTEM
UNITS WITH-
OUT
the intake fan is brought to minimum speed for 10min every
ANTIFREEZE
SYSTEM
ALL
UNITS
When the Frost alarm is triggered, the unit switches OFF and restarts automatically when the critical climatic condition disappears.
102
Antifreeze electric resistance switch on
Setpoint:
with external resistance t
Electric resistance shutdown
Preheating water coil valve activation
or ON/OFF resistance
Valve closure or ON/OFF resistance shutdown
Speed reduction of both fans
with proportional law with t
Electric resistance malfunctioning alarm
Unit switch off with "Frost" alarm
Defrost cycles:
hour
Unit switch off with "Frost" alarm
Intake air low temperature alarm
Unit switch off with "Frost" alarm
The Frost alert remains until the next time the unit is switched off and back on.
= 4°C
4
decrease.
4
Fresh
Supply
air t
air t
1
2
<-3°C
–
–
–
>0°C
–
<-3°C
–
–
–
–
–
<-3°C
–
<-3°C
–
<-20°C
–
<-5°C
–
<-10°C
–
–
<10°C
–
<5°C
Exhaust
air t
4
<4°C
<1°C
–
<3°C
<1°C
>6°C
<3.5°C
<1°C
–
–
–
–
–
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