Fan operation can be limited to be active with cooling only or heating only, or even
disabled via P350.
When fan operation is disabled, the fan symbol on the display disappears and
pressing the fan button has no impact.
This function allows for using the thermostat in universal applications such as
chilled/heated ceilings and radiator, etc. (see Chilled/heated ceiling and radiator
applications [➙ 97]).
In automatic mode, a dwelling time of 2 minutes (factory setting) is active. The fan
maintains each speed for at least 2 minutes before changing to the next speed.
The minimum on-time can be adjusted from 1…6 minutes via P362.
In automatic fan mode and with the room temperature in the dead zone, the control
valve is normally closed and the fan is disabled. With the periodic fan kick function,
the fan can be released from time to time at low speed for a minimum on-time (see
above) even if the valve is closed.
This function is used to prevent damage from moisture due to a lack of air
circulation, or to allow a return air temperature sensor to acquire the correct room
temperature.
Periodic fan kick time can be selected individually for Comfort via P363, and via
P364 for Economy.
● Fan kick value 0 means the fan runs continuously in the dead zone (only
selectable in Economy via P364)
● Fan kick value 1 and higher: Value in minutes
● Fan kick value Off means the fan does not run in the dead zone
The fan speed in the dead zone (Comfort mode) can be set via P029 (Service
level) ask per customer preferences.
To save energy, the manual fan in the dead zone is controller same as the auto fan
(P029 = 3, 4 or 5).
The following options are available:
● Auto fan does not run in the dead zone
● Auto fan runs in the dead zone at low speed during heating and cooling (P029
= 1)
● Auto fan runs in the dead zone at low speed during cooling only (P029 = 2).
During heating, the fan does not run in the dead zone.
● Auto or manual fan does not run in the dead zone (P029 = 3)
● Auto or manual fan runs in the dead zone at low speed during heating and
cooling (P029 = 4)
● Auto or manual fan runs in the dead zone at low speed during cooling only
(P029 = 5).
During heating, the fan does not run in the dead zone.
When the fan does not run in the dead zone (P029 = 0), " Periodic fan kick
Comfort" (P363) function can be enabled to periodically ventilate the room.
When the fan starts from standstill, it starts at speed 3 for 1 second to ensure safe
fan motor start by overcoming inertia and friction (selected via P361).
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