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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 9 Electronic air-fuel ratio control 01.12.2009
9.4.6 Restriction of the modulation range
If the modulation range for stage 1 and stage 2, or stage 3, shall be further restricted, 2
parameters can be used to define a new low-fire and new high-fire position.
No. Parameter
545
Lower output limit
undefined = 20 %
546
Upper output limit
undefined = 100 %
9.5 End of running position
When there is no more heat request, the system switches to phase 62. Here, the burner
runs down to low-fire as long as possible before the valves are shut.
The available period of time can be set via parameter 212. If this period of time is set to
the minimum value, the burner is immediately shut down should the heat request disap-
pear. If the time exceeds 32 seconds, the burner always runs to the low-fire position.
Naturally, it is also possible to set intermediate times.
No. Parameter
212 Max. time down to low-fire
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