Siemens RDF800KN Series Manual page 48

Fan operation in dead
zone (fan kick)
Notes:
Fan operation in dead
zone P15, Comfort
mode
Fan start kick
Fan overrun for electric
heater
CAUTION
Fan failure
48 / 94
Siemens
Smart Infrastructure
In automatic fan mode and with the room temperature in the dead zone, the control
valve is normally closed and the fan disabled. With the "Fan kick" function, the fan
can be released from time to time at low speed for minimum on-time (see above)
even if the valve is closed.
This function can be used to avoid damage from moisture due to a lack of air circu-
lation, or to allow a return air temperature sensor to acquire the correct room
temperature.
Y
Q1
0
Periodic fan kick
The periodic fan kick time can be selected individually for Comfort mode via P60,
and for Economy mode via P61.
· A fan kick value of 0 means the fan runs continuously in the dead zone.
· A fan kick value OFF means the fan does not run in the dead zone.
Using P15 at the Service level, the fan speed in the dead zone (in Comfort mode)
can be set according to customer preference.
The following options are available:
· Fan does not run in the dead zone (P15=0).
· Fan runs at low speed in heating and cooling mode (P15=1).
· Fan runs at low speed in cooling mode only (P15=2).
The functions "Fan in dead zone" (P15) and "Fan kick" (P60) are combined as
follows:
· P60 = 0
Fan runs continuously in the dead zone, P15 has no influence.
· P60 = OFF Fan operation in dead zone according to P15.
The fan first starts at speed 3 for 1 second to ensure safe fan motor start by
overcoming inertia and friction (selected using P58).
Q
1 sec
Q3
Q2
Q1
0
When the electric heater is switched off, the fan overruns for 60 seconds (P54) to
either avoid overtemperature of the electric heater or to prevent the thermal cutout
from responding.
In case of fan failure, the thermostat cannot protect the electric heater against
overtemperature. For this reason, the electric heater must be equipped with a
separate safety device (thermal cutout).
RDF800KN.., RDF800KN/VB, RDD810KN/NF
Minimum Periodic fan kick
on-time
T
Basic documentation
10385D22en
t [h:mm]
Minimum
on-time
CE1P3174en
2020-02-21