All DXR2 application types include an electric radiator application. Each DXR2 can control two electric radiators via triac or analog outputs. For electric radiators, the controller operating modes modulating or 2-point can be configured.
Plant diagram
Figure: Example of radiator application
Key:
DXR2… | Automation station |
| R1 | Room operator unit |
Rad | Radiator-type heaters |
| D1 | Presence |
OvrT | Overtemperature protection |
| D2 | Window contact |
Sequences
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Y | Output signal |
| TR | Room temperature |
SpH | Effective heating setpoint |
| SpC | Effective cooling setpoint |
YH | Heating valve |
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Figure: Modulating heating sequence
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Y | Output signal |
| TR | Room temperature |
SpH | Effective heating setpoint |
| YH1 | 1 stage |
YH | Electric radiator |
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Figure: Example of radiator application
Actuators
The DRX2 controls electric radiator valves via triac or analog outputs, regardless of available I/Os. Single-stage and modulating electric radiators are supported. Electric radiators, controlled via an analog output on the DXR2, can receive an enable via a relay or triac on the DXR2.
Safety thermostat
A binary overtemperature (open contact) protection can be connected on the DXR2 for all versions of the electric radiator application. The application switches off the radiator at device protection priority if overtemperature protection is enabled.
Description | Name | Default value |
|---|---|---|
Enable overtemperature detector input 0:No | EnOvrTDetIn | 0:No |
WARNING
Improper installation of electric heating coils can result in fire and cause destruction of life and property.
- Install a high temperature cut-out switch on all electric heating elements.
- Ensure that all wiring and installation conform to applicable safety codes and regulations.
Downdraft compensation
The downdraft compensation function slows down sinking cold air current at large window surfaces and prevents in this manner a cold wall effect on large, cold surfaces. The function activates the radiator if the outside temperature drops below a configured value by increasing the minimum radiator control to a higher value. A linear reset function implements the downdraft compensation. The control sequence is only active in the Comfort room operating mode. The following graphic provides the factory settings for the downdraft compensation parameters.
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Y | Output signal |
| TOa | Outside air temperature |
Y1 | 100 % |
| X1 | -5 °C |
Y2 | 0 % |
| X2 | 10 °C |
Figure: Downdraft compensation characteristic curve