Krom Schroder IC 20 - IC 20, Modulating Control with Burner Control Unit BCU 370

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Application > Examples of application
1.1.3 IC 20, modulating control with
burner control unit BCU 370
This connection option can be used
on modulating forced draught
burners. The BCU 370 controls the fan
and moves the butterfly valve to pre-
purge and ignition position. After pre-
purge and burner start, the controller
enable signal is is-sued to an external
three- point step controller which
positions the butterfly valve in
accordance with the capacity
demand.
The “Close contact” (90° 0°) of the
external three -point step controller
(3PS) can be connected to terminal
26 or 27 of the BCU 370.
Terminal 26: the controller operates
be-tween the open and ignition
positions.
Terminal 27: the controller operates
be-tween the open and closed
positions.