Siemens LMV37.4 Series Basic Documentation page 93

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Multistage operation X5-03 (stage 2, pin 3 / stage 3, pin 2)
In multistage operation, 1 or 2 thermostats can be connected to activate the different
burner stages. Multistage operation is possible only when firing on oil.
If neither input «Stage 2» nor input «Stage 3» is active, the burner switches to
«Stage 1».
If input «Stage 2» becomes active, the burner switches to the second stage.
If input «Stage 3» becomes active, the burner switches to the third stage. In that case,
input «Stage 2» can be active or inactive. The third stage can only be activated with 3-
stage operation.
Load controller (LR) (OPEN)
Load controller (LR) (CLOSED)
Load controller (LR) (ON/OFF)
Figure 61: 2-stage operation X5-03
Load controller (LR) (OPEN)
Load controller (LR) (CLOSED)
Load controller (LR) (ON/OFF)
Figure 62: 3-stage operation X5-03
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20.09.2013