Burner Flange X3-03, Pin 1 And 2; Input For External Load Controller (On / Off) X5-03, Pin 1; Inputs X5-03 Pin 2 And 3 (Open / Close Or Stage 2 / Stage 3) - Siemens LMV37.4 Series Basic Documentation

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7.3.2 Burner flange X3–03, pin 1 and 2
End switch burner flange (component of safety loop).
"L" for end switch burner flange
End switch burner flange
(component of safety loop)
Figure 14: Burner flange X3-03
For error diagnostics and parameters, refer to chapter Safety loop.
7.3.3 Input for external load controller (ON / OFF) X5–03, pin 1
When the external control loop is closed, the internal input message «Heat request» is
generated.
A heat request exists when the external load controller signal is pending and, depending
on the configuration, a load controller calls for heat (refer to chapter Connection of load
controllers).
When there are no more requests for heat, the burner shuts down. The fuel valves are
closed, either immediately when the timer has elapsed, or when the low-fire position is
reached, depending on the parameter settings (refer to chapter End of operating
position).
Note
Burner startup takes place only when this contact is closed.
"L" for controller
External load controller OPEN / stage 2
External load controller (On / Off)
Figure 15: Inputs for external load controller ON / OFF X5-03

7.3.4 Inputs X5-03 pin 2 and 3 (Open / Close or stage 2 / stage 3)

Inputs for connection of an external load controller with contact outputs (refer to chapter
External load controller via contacts X5-03, pin 2 and 3).
"L" for controller
External load controller OPEN / stage 2
External load controller (On / Off)
Figure 16: Inputs external load controller Open / Close X5-03
Note!
When the Switching back to pilot function (parameter 191) is used, the load controller
contacts are not available (refer to chapter Switching back to pilot).
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17.12.2018