Siemens LMS14 User Manual page 422

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Building Technologies Division
Status output K35
The status output is activated:

When, from standby, a request from the controller to the burner control is active

When startup is initiated in the phase

In the operation phase

When a request from the controller is pending
When one of the above mentioned preconditions is fulfilled, the status output is set,
even if start prevention – caused by an open gas pressure switch – is demanded.
In all other cases, the status output is deactivated.
The status output is also used if power supply for an additional gas valve (e.g. for
liquefied gas in an external tank) is required.
With these types of application, output K35 remains activated if an open gas pressure
switch causes start prevention, and the burner control quits start prevention again when
gas pressure returns (gas pressure switch closes) and a heat request is pending.
If the gas pressure switch switches off during operation, output K35 is only deactivated
during postpurging. If the request for heat continues to exist and the burner control
goes to start prevention, output K35 is activated again and remains activated.
Status information K36
The output is switched when the Operation phase (modulation) is active and when the
status output is selected for use with one of the relay outputs QX1...3.
Fan shutdown K38
Function Fan shutdown to turn off power when the fan is not needed.
dT controller 1 K21 ¦ dT controller 2 K22
Relays K21 and K22 are used for the delta-T controller function.
User Manual LMS14...
6 The settings in detail
CC1U7471en
28.01.2015