57/213
Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 6 Basic unit 01.12.2009
6.5.3.10. Continuous fan
For burners that can be damaged by heat (e.g. several burners using the same combus-
tion chamber), continuous purging may be required. In that case, the fan operates in all
phases.
For that purpose, the fan motor contactor is to be connected to X3-05, terminal 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 motor contactor X3-05, terminal 1. When output X3-05, terminal 1, is activated,
the relief valve diverts the fan pressure to the air pressure switch and, when deacti-
vated, ensures that no pressure is fed to the switch.
Example:
LMV...
Bild 296e /04 0 9
X3-05
X3-02
Figure 28: Continuous fan
To Next Page
Loading...
