Zehnder Rittling ComfoAir 70 User Manual page 11

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Standby mode
Extract air mode
LED1 flashes in
alternation with the
current fan speed
Supply air mode
LED4 flashes in
alternation with the
current fan speed
Frost protection
mode
LEDs1-3 flash
Flashing of most
recently active fan
speed when supply
air fan is switched
off
(Display of LED1-3
as example)
Indication of
locked modes
Fault LED flashes
Description
The unit can be switched from FS1 to Standby mode by touching the (-)
button. The fans then come to a stop.
NOTE
The shutters are closed automatically.
Standby mode is excited by touching the (+) button. The unit will start
with fan speed 1.
NOTE
The shutters are opened automatically.
There is no indication of the Standby mode from the LEDs of the control
panel.
Touching the (-) key for 5 seconds in operating modes FS1 to FS4
activates or deactivates the Extract air mode. The supply air fan is
switched off; the extract air fan continues to run with the current fan
speed.
The display for the current fan speed alternates every 2 seconds with the
flashing LED1.
Touching the (+) key for 5 seconds in operating modes FS1 to FS4
activates or deactivates the Supply air mode. The extract air fan is
switched off; the supply air fan continues to run with the current fan
speed.
If the outdoor temperature falls below 13 °C, the extract air fan will be
activated.
The display for the current fan speed alternates every 2 seconds with the
flashing LED4.
From an outside air temperature of -4°C, the frost protection function is
automatically activated.
In frost protection operating mode, the ratio between the supply air and
extract air volume flow is automatically adjusted depending on the
outside air temperature, and the unit is shut down if the outside air
temperature is lower than -15°C. A check is made regularly as to whether
the temperature conditions in regard of frost protection have changed,
and the respective operating mode (requiring frost protection) is
activated automatically according to the result of that check.
After the unit is switched off, a flashing in those LEDs (by touching the
(+) or (-) key) which denoted the most recently active fan speed will be
signalled. The fan speed cannot be changed and is signalled with the
flashing of Fault LED
NOTE
Changing from a higher to a lower fan speed may not be possible
depending on the currently active frost protection routine.
The shutters are closed or opened automatically depending on the
currently active frost protection routine.
If an inaccessible operating mode is selected, it will be signalled by the
flashing of Fault LED.
These operating modes are the locked standby, locked supply and
extract air mode and complete switch-off due to frost protection.
Explanation
9