Modulating boiler stage power

In all the control modes, standalone or multiple boiler control, the module always provides:

The capacities of stage 1 and the modulating stage must be defined, by parameters ST1-01 and STM-01. If the capacity of stage-1 is set to a value of “0”, the output “Stage1Cmd” will only act as a boiler-enable signal and the minimum on/ off times and blocking times for the next stages (ST1-02 – ST1-05) will be inactive.

When the power of the modulating stage STM-01 = 0, the boiler will behave as a 1 stage boiler.

If both ST1-01 = 0 and STM-01 = 0 the heat generator will never start.

Table 7.   Parameter List

Description

Value Range

Default Value

Unit

ST1-01: capacity stage 1

0...1E6

10

kW

STM-01: capacity modulating stage

0...1E6

20

kW