| 4.7.5 | Single duct with electrical heater |
|
| |
Single duct with electrical | In single duct applications with electrical heater, the thermostat controls a valve | |
heater | plus an auxiliary electrical heater. Parameter P01 is not available. | |
| The output signal for the air flow can be limited to a minimum and maximum value | |
| if required (see section 4.6 "additional features"). | |
Electrical heating, | The air flow starts to rise when the acquired room temperature is above "setpoint" | |
active in cooling mode | + "dead zone". | |
| The electrical heater receives an ON command when the acquired room | |
| temperature drops below “setpoint” – “dead zone” (= “setpoint for electrical | |
| heater”). |
|
Digital input “Enable | Remote enabling/disabling of the electrical heater is possible via input X1, X2, or | |
electrical heater” | D1 for overheat protection, tariff regulations, energy saving etc. | |
| Input X1, X2, or D1 must be commissioned accordingly (parameter P38, P40, P42). | |
| See section 4.9 “Multifunctional input”. | |
Caution | In case of insufficient air flow, the thermostat cannot protect the electrical heater | |
| against overtemperature. That is why the electrical heater must feature a separate | |
| safety device (thermal cutout). | |
Sequences | ON/OFF electrical heater |
Y |
|
XpC | C |
100% |
|
Vmax | max |
| |
YV |
|
Vmin |
|
min |
|
0% |
|
TR [°C]
Y
SDH
ON
YE
Modulating electrical heater
Y | XpC |
| |
100% | C | ||
| |||
|
| ||
Vmax |
| max | |
|
| ||
Vmin | YV |
| |
min |
| ||
|
| ||
0% | TR [°C] | ||
| |||
Y
XpH |
100% |
YE |
OFF
W
dz | TR [°C] |
|
0% |
|
| W |
|
|
|
| dz |
| TR [°C] |
Y | Output signal |
TR | Room temperature |
WEffective setpoint Comfort
H Heating sequence
C Cooling sequence
YV | Volume flow rate |
YE | Electrical heater |
XpH | Proportional band heating |
XpC | Proportional band cooling |
Vmin | Minimum volume output |
Vmax | Maximum volume output |
Note: The diagrams show the PI controller's proportional part only.
Setting the sequence and the control outputs
Refer to sections 4.5 (applications), 4.7.1 (sequences) and 4.7.3 (outputs).
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Siemens | RDG100…/RDG110…/RDG140.../RDG160… Basic Documentation | CE1P3182en |
Building Technologies | Functions | 28 May 2009 |
