3.6.8 2-pipe / 2-stage heating or cooling
On 2-stage applications, the thermostat controls 2 valves or compressors in
heating or cooling mode or changeover (automatically or manually).
"Cooling only" is factory-set (P01 = 1).
In heating mode, the 1st stage is activated if the acquired temperature is below the
setpoint.
The 2nd stage is activated if the acquired room temperature drops below "setpoint"
minus "setpoint differential".
In cooling mode, the 1st stage is activated if the acquired temperature is above the
setpoint.
The 2nd stage is activated if the acquired room temperature rises above "setpoint"
plus "setpoint differential".
The diagrams below show the control sequence for 2-position control.
Y
TR [°C]
1
0
w
SDH
SDH
w
D
YHC2
YHC1
318 1D15
Y
TR [°C]
SDCSDC
YHC1
Y
HC2
3
181D15
w
w
D
1
0
Changeover (P01 = 2 or P01 = 3)
Y
TR [°C]
SDHSDH
SDC
SDC
Changeover
YHC2
YHC1
YHC2
318 1D17
w
D
w
D
1
0
Room temperature setpoint
Control command "Stage 1"
Control command "Stage 2"
Switching differential "Heating" (P30)
Switching differential "Cooling" (P31)
D
Setpoint differential (P34)
-stage heating
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Siemens RDG100KN, RDG160KN Basic documentation CE1P3191en
Building Technologies Functions 2014-05-23
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