Technical data

The thermostat can control a 1- or 3-speed fan (selected via control parameter
P53). A 1-speed fan is connected to terminal Q1, a 3-speed fan to terminals Q1,
Q2 and Q3.
When DC 0...10 V Fan and DC 0...10 V valve output control are selected, the fan
switching points can be set via the following parameters:
– P55: ECM fan max. output
– P56: ECM fan min. output
– P57: Switching point fan
Xdz
3
1
9
1
Z
1
1
4
_
0
1
T[°C]
Y
100%
0%
w
T[°C]
Q
XpH
XpC
Fan_min
Fan_max
Fan_on
100%
0%
w Room temperature setpoint
Q Fan speed
Y
H
Control demand "Heating"
Y
C
Control demand "Cooling"
XpH Proportional band "Heating" (P30)
XpC Proportional band "Cooling" (P31)
X
dz
Dead zone (P33)
Fan_max Max. fan speed (P55)
Fan_min Min. fan speed (P56)
Fan_on Fan switch-on point (P57)
The diagram only shows the PI control’s proportional part.
Fan speed 1 = Min. fan speed
Fan speed 2 = half-way between Min. fan speed and
Max. fan speed
Fan speed 3 = Max. fan speed
Xdz
w
T[°C]
Q
3191Z115_01
Fan_min
Fan_max
100%
0%
Fan III
Fan II
Fan I
=
=
Note: The control signals
"Heating" and "Cooling" are not
influenced by the manual setting
of fan speeds.
For heating or cooling with 2 sequences (e.g. heating with a heating coil and an
electric heater, or 2-stage cooling), the fan is always synchronized with the first
sequence.
Fan operation can be limited to be active with cooling only or heating only, or even
be totally disabled via control parameter "Fan operation" P52.
When fan operation is disabled, the fan symbol on the display disappears and
pressing the fan button has no impact.
This function allows you to use the thermostat on universal applications such as
chilled / heated ceilings and radiator, etc. (see section 3.6.9).
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.
his minimum on-time can be adjusted from 1…6 minutes via parameter P59.
1-speed / 3-speed fan
Control sequence
for DC 0...10 V fan
(ECM) and DC 0...10 V
valves (RDG160KN)
Note
Manual operation
DC 0...10 V fan
2 sequences heating /
cooling
Fan operation as per
heating / cooling mode,
or disabled
Fan minimum
on- time
55 / 102
Siemens RDG100KN, RDG160KN Basic documentation CE1P3191en
Building Technologies Functions 2014-05-23