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Building Technologies Basic documentation LMV37.4... CC1P7546en
10 Electronic ratio control 17.12.2018
10.4.6 Limitation of 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 high-fire position.
No. Parameter
545
Lower output limit
undefined = 20 %
546
Upper output limit
undefined = 100 %
10.5 End of operating position
When there is no more heat request, the LMV37.4 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 time is set to the
minimum value, the burner is immediately shut down if there are no more requests for
heat. If the time exceeds 32 seconds, the burner always runs to low-fire. Naturally, it is
also possible to set intermediate times.
No. Parameter
212 Maximum time down to low-fire
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