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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 4 Burner control 13.08.2004
4.1.1 Digital inputs
This input serves for including the safety loop. The special feature of this input is that all
signal source contacts connected in series here directly switch off the power supply to the
fuel valves and ignition.
Typically, the following contacts are included in the safety loop:
− External burner switch ON / OFF
− Safety limit thermostat / safety pressure limiter (SLT / SPL)
− External temperature limiter / pressure switch, if required
− Water shortage switch
− End switch burner flange (component of safety loop)
For the diagnosis, the signal source contacts are combined for delivering the «Safety
loop» message. If no signal is received, the burner will at least be shut down. What fol-
lows is a number of repetitions that can be parameterized.
Parameter: SafetyLoop
When the external control loop is closed, the signal from the integrated controller (if
present) is used to deliver the internal «Heat demand» information to the input.
− There is a demand for heat when this external controller signal is present and – if
present and configured – there is a demand for heat from the internal load controller
or the building automation system
When there is no more demand for heat, the burner will be shut down. Depending on
the parameterization, the fuel valves will either be shut the moment the period of time is
completed by the timer, or after the MIN load is reached → Part load shutdown. In op-
eration with the internal load controller or with load control, the input can be deactivated
via a building automation and control system. This means that a wire link at this control-
ler input is not required. In operating mode 1 (ExtLR X5-03), the input is always active,
deactivation is not active → Operating modes with load controller.
Parameter: InputController (activated / deactivated)
1)
1)
(Parameter text) in Italics = text displayed on the AZL5...
The input is also valued with manual operation burner ON / OFF!
SAFETY LOOP
X3–04
FLANGE
X3–03
Inputs for external
controller
(ON/OFF)
X5–03
Note
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