Siemens RDG20 KN Series - Page 91

Functions
Control sequences
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The diagrams below show the control sequence of modulating PI control.
Heating and cooling mode (P001 = 4)
Heating mode with manual selection
(P001 = 3) or
for energy saving (P010 = 2 & P014) in
heating sequence
Cooling mode with manual selection
(P001 = 3) or
for energy saving (P010 = 2 & P015) in
cooling sequence
T[°C] Room temperature
YH Control command "Valve"
(heating)
w Room temperature setpoint
YC Control command "Valve"
(cooling)
X
dz
Dead zone (P055)
XpH Proportional band "Heating"
(P050)
XpC Proportional band "Cooling"
(P052)
The diagrams only show the PI thermostat’s proportional part.
For setting sequence and control outputs, see Application overview [➙ 43],
Sequence overview (setting via P001) [➙ 77] and Control outputs [➙ 101].
Parameter P256 (RDG264KN only), P260 & P261 (RDG26..) sets the
heating/cooling flow limitation. See Additional functions [➙ 48].
Modulating control:
3-position, PWM, or
DC 0...10 V
Note