Siemens RDG20 KN Series - Page 110

Functions
Fan control
4
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A6V11545892_en--_e
In applications with On/Off control:
1. The switching point for low fan speed is synchronized to the heating/cooling
output. P353 (switching point fan speed low) is not relevant.
2. The maximum switching range of the fan (XpH
Fan
/XpC
Fan
) is defined by the
switching differential (SDH/SDC) via a reference table.
Heating/cooling
1- or 3-speed fan
DC 0...10 V fan
T [°C] Room temperature
w Room temperature setpoint
Q Fan speed
Y Control command "Valve"
SDH Switching differential
"Heating" (P051)
SDC Switching differential
"Cooling" (P053)
X
dz
Dead zone (P055)
XpH
Fan
Switching range for fan
"Heating" (Table)
XpC
Fan
Switching range for fan
"Cooling" (Table)
Fan 3-speed switching point
high (P355)
Fan 3-speed switching point
med (P354)
Fan_max Max. DC 0...10 V fan
speed (P359 for heating & P360 for
cooling)
Fan_med Med. DC 0...10 V fan
speed
(P358)
Fan_min Min. DC 0...10 V fan
speed (P357)
SDH/SDC [K]
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
>4.5
XpH
Fan
/XpC
Fan
[K]
2
3
4
5
6
7
8
9
10
The thermostat can control a 1- or 3-speed fan (selected via P351). A 1-speed fan
is connected to terminal Q1, and a 3-speed fan to terminals Q1, Q2 and Q3.
Fan control with On/Off
heating/cooling control
Reference table with
On/Off control
1-speed/3-speed fan