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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 8 Connection to load controllers 01.12.2009
Shifting multistage operation (OPEN ▲ terminal 3 / CLOSE ▼ terminal 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 con-
troller.
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 in-
creased by driving the burner to high-fire.
LMV...
Bild 319e /040 9
X5-03
Load controller (LR) (ON / OFF)
L
ON / OFF
Figure 36: Shifting multistage operation (OPEN ▲ terminal 3 / CLOSE ▼ terminal 2)
Parameter 205 is needed to interchange usage of the load controller contacts for multi-
stage operation. In that case, the burner switches to the third stage when input
stage 2
is active (load controller Off). This has no impact on modulating operation.
No. Parameter
205
Function load controller contacts
0 = standard
1 = stages interchanged
Modulating Standard Stages interchanged
X5-03/1 ON / OFF Low-fire Low-fire
X5-03/2 Closed Signal Closed Signal Closed
X5-03/3 Open Signal Open Signal Open
2-stage Standard Stages interchanged
X5-03/1 ON / OFF Stage 1 Stage 1
X5-03/2 Closed Stage 2 Stage 1
X5-03/3 Open Stage 2 Stage 2
3-stage Standard Stages interchanged
X5-03/1 ON / OFF Stage 1 Stage 1
X5-03/2 Closed Stage 3 Stage 2
X5-03/3 Open Stage 2 Stage 3
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