Auxiliary Heating Controller
The auxiliary heating controller is a two-channel controller that regulates status and flow rate of the boiler and the status of a further component based on tank temperatures in two layers.
The controller has 2 analogic inputs.
The controller has 1 (plus 1 optional) digital output.
A switch is turned on based on the temperature of a given point and turned back off based on the temperature of (another potential) point.
Block Diagram
The block diagram shows the employed measuring and controlling values
Controller Input Mask
With this setting the auxiliary heating cuts in as soon as layer temperature 11 in the tank drops below 53°C.
Input Values
Layer Temperature Sensor on [°C]
The value refers to the tank layer in which the temperature is measured to switch on the heating. Select the relevant tank layer.
Layer Temperature Sensor off [°C]
The value refers to the tank layer in which the temperature is measured to switch off the heating. Select the relevant tank layer.
Description of Control Parameters
Description
The “description” value enables the user to assign controllers any name of number. Polysun assigns a consecutive number as a standard feature as different controllers are added chronologically in the hydraulic system.
Sign of Output
The term “Normal“ means that digital output signals are controlled as intended in the switching logics. (Example: if X1< cut-in tank temperature the output of pump 1 is positive)
The term “Inverted” that output signals are multiplied -1.
Cut-in Tank Temperature [°C]
Enter the temperature at which the heating should be turned on.
Cut-off Tank Temperature [°C]
Enter the temperature at which the heating should be turned off.
Output Values
Heating Status
This digital output refers to the heating to be controlled. Select the relevant boiler from the list.
Switch Status (Optional)
This digital output enables, if required, to control one further component, for example a second heating, pump or a switching valve. Select the relevant component from the list. This will only allow you to control the status of a given component.
Overview of Control-Dependencies
Table: Control-dependencies
| Outputs | Parameter | Tip | Inputs | Function |
| Y1: heating status Y1 = Y2 Y2: switch status | — | Adjust heating to: – Fixed power – controlled power – controlled temperature | X1: Layer temperature sensor on [°C] | Y1=1 if X1 < Cut-in tank temperature [°C] Y1=0 if X2 > Cut-off tank temperature [°C] |
| X2: Layer temperature sensor off [°C] |