Continuous Fan - Siemens LMV36.520A1 Basic Documentation

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7.5.5.10. Continuous fan

With burners that can be damaged by heat (e.g. several burners using the same
combustion chamber), continuous purging may be required. In that case, the fan
operates continuously in all phases.
For that purpose, the fan motor contactor is to be connected to X3-05, pin 3, tapped
after the unit fuse and the safety loop.
For checking the air pressure switch, a pressure switch relief valve must be connected
to fan output X3-05, pin 1. When output X3-05, pin 1, is activated, the relief valve diverts
the fan pressure to the air pressure switch and, when deactivated, ensures that no
pressure is fed to the switch.
Example:
Figure 42: Continuous fan
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25.09.2013