Siemens LMV27.100x2 Basic Documentation page 83

Building Technologies
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 60: 2-stage operation X5-03
Load controller (LR) (OPEN)
Load controller (LR) (CLOSED)
Load controller (LR) (ON/OFF)
Figure 61: 3-stage operation X5-03
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17.12.2018