13
Icon
Description
Explanation
LED1 and the
current LS flash
alternately
Exhaust air
operating mode
Touching the (-) button for 5 seconds while in operating modes LS1 to LS4 activates
or deactivates the Exhaust air operating mode. The supply air fan is switched off; the
exhaust air fan continues to run with the current LS.
The display for the current LS changes every 2 seconds with the flashing LED1.
To avoid condensation appearing on the outer panel, the unit automatically changes
to the Frost protection operating mode when the frost protection temperature is
reached. The supply air fan is operated for several minutes every hour in order to
record the correct outside air temperature.
LED4 and the
current LS flash
alternately
Supply air
operating mode
Touching the (+) button for 5 seconds while in operating modes LS1 to LS4 activates
or deactivates the Supply air operating mode. The exhaust air fan is switched off; the
supply air fan continues to run with the current LS.
If an outdoor temperature of < 55°F (13°C) is not reached, the exhaust air fan will
begin operation.
The display for the current LS changes every 2 seconds with the flashing LED4.
LEDs1-3 flash
Flashing of most
recently active
fan speed when
supply air fan
is switched off
(display of LED1-3
as example)
Frost protection
operating mode
A temperature threshold, which activates the Frost protection operating mode, if
not reached, is stored for each fan speed. Here, the fan speed for the supply air fan
is linearly regulated between the maximum and minimum set point, depending on
the outdoor temperature. The fan speed can continue to be changed in the Frost
protection mode.
The supply air fan is switched off if a second temperature threshold is not reached
within a specific duration.
This status is indicated by the flashing of the LEDs that are indicative of the most
recently active fan speed.
If the outdoor temperature falls below a further temperature threshold, then the
exhaust air fan will also be deactivated, and the unit will have a status of complete
shut-down.
The LEDs for the most recently active fan speed will stop flashing.
The supply and exhaust dampers are closed automatically!
During complete shut-down, the fan speed cannot be changed. Touching the (-) or (+)
button leads to rapid flashing (5x) in LED1-4.
LED1-4 flash
Indication of
disabled states
If, by touching a button, a status is entered that is not available, then this will be
signaled by rapid flashing (5x) in LED1-4.
These states are: disabled standby, disabled supply air or exhaust air mode, and
complete shut-down by Frost protection.