Krom Schroder IC 20 - IC 40, Staged Control with Pre-Purge

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Application > Examples of application
1.1.7 IC 40, staged control with pre-purge
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.
To activate the high -fire rate, DI 2 is actuated via the air
valve output on terminal 26 of the BCU.
The butterfly valve moves cyclically between the high-fire
rate position and the low-fire rate position (see Operating
mode 11, 2-step operation with two digital inputs).
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
middle
High-fire rate
Off
On
high
Pre-purge