393870-2 Rev 0: 11.07.2018 BBV
We reserve the right to change technical data without notice.
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Page 13
4.5.1.9 Defrost
Menu for how to change defrost mode if
temperature is low and humidity is height.
From the start up menu you can see which
defrost mode the unit is set in.
The unit is set in mode
OFF
from factory.
If it is needed to change the defrost
mode to another mode then press
button 4 and scroll down to Configuration
with button 3.
Press enter button and follow procedure
as in
Menu 4.5 Setup
to continue.
Press enter button
Defrost mode
OFF
from factory.
Modus 1:
at low humidity.
Defrosting function start at -20°C.
Modus 2:
at normal humidity.
Defrosting function start at -15°C.
Modus 3:
at high humidity.
Defrosting function start at -10°C.
The function when defrosting starts is that
each hour the supply air fan stops for 6
minutes. The heater
EV
turns off. Extract air
fan reduces speed to 30% and the rotary
exchanger will run as normal.
To avoid that the rotary exchanger will stop
when the cycle goes back to normal function,
the supply air fan will start up the last minute
of the defrosting mode cycle.
(Supply air fan reacts delayed relative to the
control signals and rotary exchanger so that
the heater will not engage
until the speed of
the supply air fan has passed 250 r/min, in
normal operation).
