User Manual

Functions
Control sequences
4
A6V11545892_en--_a 63 | 146
T[°C] Room temperature
w Room temperature setpoint
YHC1 Control command "Stage 1"
YHC2 Control command "Stage 2"
SDH Switching differential "Heating"
(P051)
SDC Switching differential "Cooling"
(P053)
w
D
Setpoint differential (P056)
The diagrams below show the control sequence for modulating PI control.
Heating mode (P001 = 0) Cooling mode (P001 = 1)
Changeover (P001 = 2 or P001 = 3,
P254 = 0)
Changeover (P001 = 2 or P001 = 3,
P254 = 1) (swap function)
T[°C] Room temperature
w Room temperature setpoint
YHC1 Control command "Stage 1"
YHC2 Control command "Stage 2"
XpH Proportional band "Heating"
(P050)
XpC Proportional band "Cooling"
(P052)
w
D
Setpoint differential (P056)
The diagrams only show the PI thermostat’s proportional part.
For setting sequence and control outputs, see Applications overview [➙ 36],
Sequence overview (setting via P001) [➙ 54] and Control outputs [➙ 75].
● For applications with different signals, On/Off (1
st
stage) and DC (2
nd
stage),
heating/cooling P-band modulating (P050, P052), small switching differential
SDH / SDC (P051, P053) is suggested to start 1
st
sequence as soon as heating
/ cooling demand is requested.
● Set the heating flow limitation function with parameter P256 (RDG260KN)
when using a PICV on this application. See Additional functions [➙ 41].
Modulating control:
3-position, PWM or
DC 0…10 V
Note
Note