1 or 2 stage boiler control

In all the control modes, standalone or multiple boiler control, the module always provides staged control of the outputs “ST1Cmd” and “ST2Cmd”.

For 1-stage operation the capacity of stage 1 must be defined in parameter ST1-01 and parameter ST2-01 must be “0”. In this case the minimum on/ off times and blocking times for the next stages (ST2-02 – ST2-05) will be inactive.

If a 2-stage boiler control is used, both parameters ST1-01 and ST2-01 with their respective capacity value must be defined.

If ST1-01 = 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

ST2-01: capacity stage 2

0...1E6

10

kW