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Building Technologies Basic documentation LMV37.4... CC1P7546en
9 Connection to load controllers 17.12.2018
Shifting multistage operation (OPEN pin 3 / CLOSE pin 2)
Using a simple thermostat, a modulating burner can be operated in shifting 2-stage
mode. In that case, there must be a firm connection between terminal CLOSE and the
live conductor (L), and terminal OPEN must be connected to the thermostat or the load
controller.
If OPEN is inactive, the active CLOSE terminal drives the burner to low-fire.
If OPEN becomes active, priority is given over terminal CLOSE so that the output is
increased by driving the burner to high-fire.
LMV...
7546z203e/0913
X5-03
L
ON/OFF
Load controller (LR) (OPEN)
Load controller (LR) (CLOSED)
Load controller (LR) (ON/OFF)
Figure 72: Shifting multistage operation (OPEN pin 3 / CLOSE pin 2)
Parameter 205 is needed to interchange usage of the load controller contacts for
multistage operation. In that case, the burner switches to the third stage when input
Stage 2 is active (load controller OPEN). This has no impact on modulating operation.
No. Parameter
205
Function Load controller contacts multistage
0 = standard
1 = stages interchanged
Modulating Standard Stages interchanged
X5-03 pin 1 ON / OFF Low-fire Low-fire
X5-03 pin 2 Close Signal Close Signal Close
X5-03 pin 3 Open Signal Open Signal Open
2-stage Standard Stages interchanged
X5-03 pin 1 ON / OFF Stage 1 Stage 1
X5-03 pin 2 Close Stage 2 Stage 1
X5-03 pin 3 Open Stage 2 Stage 2
3-stage Standard Stages interchanged
X5-03 pin 1 ON / OFF Stage 1 Stage 1
X5-03 pin 2 Close Stage 3 Stage 2
X5-03 pin 3 Open Stage 2 Stage 3
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