Siemens RDG100 Basic Documentation page 45

1-speed/3-speed fan
Control sequence
for DC 0...10 V fan
(ECM) and DC 0...10 V
valves (RDG160T..)
Note
Manual operation
DC 0...10 V fan
Note
2 sequences
heating/cooling
Fan operation as per
heating/cooling mode,
or disabled
Siemens
Building Technologies
The thermostat can control a 1-speed 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 is 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
Y
100%
0%
XpH
Q
100%
0%
The diagram only shows the PI control's proportional part.
Fan speed 1 I = Min. fan speed
Fan speed 2 II = half-way between min. fan speed and max. fan speed
Fan speed 3 III = Max. fan speed
Q
100%
Fan III
=
Fan II
=
Fan I
0%
By heating only with electric heater, manual fan speed 1 I cannot be selected to
guarantee the necessary minimum air flow for the electric heater and to avoid
overheating of the system.
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 4.7.9).
RDG100.., RDG110.., RDG160T.. Basic Documentation
Functions
Xdz
w
XpC T[°C]
F an_on
Fan_max
F an_min
T[°C]
Fan_max
Fan_min
w
Xdz
w Room temperature setpoint
Q Fan speed
Y Control demand "Heating"
H
Y Control demand "Cooling"
C
XpH Proportional band "Heating"
(P30)
XpC Proportional band "Cooling"
(P31)
X Dead zone (P33)
dz
Fan_max Max. fan speed (P55)
Fan_min Min. fan speed (P56)
Fan_on Fan switch-on point (P57)
Note: The control signals
"Heating" and "Cooling" are not
influenced by the manual
setting of fan speeds.
T[°C]
45/81
CE1P3181en
2015-07-29