Krom Schroder IC 20 - IC 40, Continuous Control with Defined Ignition Position

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Application > Examples of application
1.1.8 IC 40, continuous control with defined ignition
position
The central control system starts the pre-purge. Input DI 2
is actuated via the air valve output of the BCU and moves
the butterfly valve BVA to the pre-purge position.
In the event of a temperature demand, the burner control
unit BCU actuates input DI 1 via the valve output V1 and
moves the butterfly valve to the ignition position.
(Precondition: the IC 40 must have reached the ignition
position on the instant of ignition.) The burner starts.
The BCU actuates DI 2 via the air valve output. This enables
the analogue input AI on the actuator IC 40. Depending
on the capacity demand of the temperature controller,
the butterfly valve BVA moves steplessly to the position
between the low-fire rate and the high-fire rate as
specified by the analogue input AI (see Operating mode
27, 2-step operation with two digital inputs and variable
adjustment angle).
DI 1/
DI 2/
IC 40
Valve position
V1
air valve
position
Off
Off
closed
Closed
On
Off
low
Ignition position/low-fire rate
On
On
AI
Any position between ignition
position and pre-purge
Off
On
high
Pre-purge/high-fire rate