Direct Heating Circuit - Promatic WDC10B Manual

temperature - parameter P5.3, the mixing valve will gradually begin to close. If the heat accu-
mulator temperature exceeds the maximum heat accumulator temperature - parameter
S5.13, the heat accumulator overheating protection is activated, which opens the mixing
valve up to the maximum stand-pipe temperature - parameters S2.6 and S3.6. The protec-
tion is deactivated, when the heat accumulator temperature drops below the maximum tem-
perature.
Limitation of ΔT or heating power in first circuit
If you wish to limit the maximum power of the heating circuit, connect the return-pipe temper-
ature sensor. Set the parameter S1.4=2 (for sensor T1) or S1.5=4 (for sensor T8), then set
the maximum permissible difference between stand-pipe and return-pipe temperatures with
parameter S2.14.
Limitation of ΔT or heating power in second circuit
If you wish to limit the maximum power of the heating circuit, connect the return-pipe temper-
ature sensor. Set the parameter S1.4=2 (for sensor T1) or S1.5=4 (for sensor T8), then set
the maximum permissible difference between stand-pipe and return-pipe temperatures with
parameter S2.14.
Limitation of return temperature into the boiler
Install T1 sensor into the return-pipe into the boiler and set parameter S1.4=11. If return-pipe
temperature drops below the minimum temperature - parameter S5.14, the mixing valve will
gradually close. This measure relieves the boiler and prevents condensation in boiler fire-
place. In order to enable proper functioning, the hydraulic connection must provide primary
circulation of boiler water.

DIRECT HEATING CIRCUIT

By controlling the boiler, the required temperature supply for the direct heating circuit is pro-
vided.
Stand-pipe temperature calculation
The upper limit of stand-pipe temperature calculation is set with maximum stand-pipe
temperature - parameter S3.6. Parameter S3.1 used to set the influence of room tempera-
ture deviation for the calculation of the stand-pipe temperature, and with the parameter P3.2
you can adjust the parallel shifting of the heating curve.
Heating switch off
If the calculated temperature of the stand-pipe isn't at least a few °C higher than the room
temperature, the heating is automatically switched off. If the room temperature is not
measured and when the outdoor temperature approaches the required temperature, then
the heating is automatically switched off. The temperature difference at which the boiler will
switch off can be increased or decreased with parameter S3.13.
At automatic switch off of the heating, a temperature of 4 °C is set for the temperature of
the stand-pipe and the circulation pump is turned off with delay - parameter S3.16. With pa-
rameter S3.4, pump operation mode can be selected.
Intensive - BOOST heating
With parameters P3.3 and P3.4 you can define time and intensity of intensive (BOOST)
heating, which is activated at transition of time program from night to day heating interval.
53 Service setting manual