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Siemens RDF300…/RDF340.../RDF400… Basic Documentation CE1P3076en
Building Technologies 4BFunctions 28 Aug 2008
In automatic mode, a dwelling time of 2 minutes (factory setting) is active. The fan
maintains each speed for at least 2 minutes before it changes to the next speed.
This minimum on-time can be adjusted from 1…5 minutes via parameter P59.
In automatic fan mode and with the room temperature in the dead zone, the control
valve normally is closed and the fan is 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 sensor to measure the correct room temperature.
Y
t [h:mm]
Q1
0
10385D22en
Periodic fan kick
Minimum
on-time
Periodic fan kick Minimum
on-time
The periodic fan kick time can be selected individually for Comfort mode via
parameter P60 and for Energy Saving mode via parameter P61.
Note: Fan kick value “0” means the fan runs continuously in the dead zone.
Fan kick value “OFF” means the fan is not running in the dead zone.
When the fan starts from standstill, it starts at speed 3 for 1 second to guarantee
safe fan motor start by overcoming inertia and friction (selected via parameter
P58).
Q
Q3
Q2
Q1
0
T
1 sec
When the electrical heater is switched off, the fan overruns for 60 seconds
(parameter P54) to avoid overtemperatures of the electrical heater or prevent
thermal cutout from responding.
In case of fan failure, the controller cannot protect the electrical heater against
overtemperatures. That is why the electrical heater must feature a separate safety
device (thermal cutout).
The clean fan filter reminder function counts the fan operating hours and displays
message “FIL”
to remind the user to clean the fan filter as soon as the threshold
is reached. This does not impact controller operations, which continues to run
normally.
The clean filter reminder is reset when the operating mode is manually set to
Standby or Protection respectively
.
In Auto Timer mode, default fan mode is automatic. The fan mode can be changed
to manual by pushing the “FAN” button. The fan returns to the automatic default
mode after each switchover from Comfort to Energy Saving and vice-versa.
Fan minimum on-
time
Fan operation in
dead zone
Fan start
Fan overrun for
electric heater
Fan failure
Clean fan filter
reminder
Fan in Auto Timer
mode
(RDF400… only)
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