Siemens RDF302 - Page 24

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Siemens RDF302 Basic documentation CE1P3079en
Building Technologies 07 Dec 2011
ON/OFF control
The diagrams below show the control sequence for 2-position.
Heating mode
(automatic changeover = heating or heating only)
Cooling mode
(man. / auto. changeover = cooling or cooling only)
Y
½ SDH
1
0
½ SDH
w
3191D06
T[°C]
YHC
½ SDH
½ SDH
YE
w
D
Y
½ SDC
1
0
½ SDC
w
3191D05
T[°C]
YHC
½ SDH
½ SDH
YE
x
dz
Heating mode with manual changeover (P01 = 2)
(manual changeover = heating)
T[°C] Room temperature
W Room temperature setpoint
YHC Control command “Valve” or “Compressor”
YE Control command “Electric heater”
SDH Switching differential “Heating” (P30)
SDC Switching differential “Cooling” (P31)
X
dz
Dead zone (P33)
½ SDH
1
0
½ SDH
w
Y
3076D07
T[°C]
YE
w
D
Setpoint differential (P34)
The diagrams only show the PI thermostat’s proportional part.
Setting the sequence and the control outputs
Refer to sections 3.4 "Applications", 3.6.1 "Sequences", and 3.7 "Outputs".
Control se
quence
ON/OFF output
Note: