Siemens RDG20 KN Series Basic Documentation page 87

Modulating control:
PWM or DC 0...10 V
Note
Note
A6V11545892_en--_c
The diagrams below show the control sequence for modulating PI control.
Heating and cooling mode (P001 = 4)
Heating mode with manual selection
(P001 = 3) or
to save energy (P010 = 2 & P014) in the
heating sequence
T[° C] Room temperature
w Room temperature setpoint
X Dead zone (P055)
dz
w Setpoint differential (P056)
D
The diagrams only show the PI thermostat's proportional part.
For setting sequence and control outputs, see Application overview [➙ 42],
Sequence overview (setting via P001) [➙ 75] and Control outputs [➙ 99].
●
For applications with different signals, On/Off (1
heating/cooling P-band modulating (P050, P052), a small switching differential
SDH / SDC (P051, P053) is suggested to start 1
/ cooling demand is requested.
●
Set the heating flow limitation function with parameter P256 (RDG26..KN)
when using a PICV in this application. See Additional functions [➙ 47].
Functions
Control sequences
Cooling mode with manual selection
(P001 = 3) or
to save energy (P010 = 2 & P015) in the
cooling sequence
YH1, YC1 Control command "Valve"
stage 1
YH2, YC2 Control command "Valve"
stage 2
XpH Proportional band "Heating"
(P050)
XpC Proportional band "Cooling"
(P052)
st stage) and DC (2
st
sequence as soon as heating
4
nd stage),
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