Program Stop Function; Forced Intermittent Operation (<24 Hours); Low-Fire Shutdown - Siemens LMV36.520A1 Basic Documentation

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Infrastructure & Citiies Sector
7.5.5.7.

Program stop function

To simplify the burner settings in connection with commissioning and service work, the
program sequence of the LMV36... can be stopped at the following positions:
1) Air damper in prepurge position
2) Ignition position
3) Interval 1
4) Interval 2
The program stops are integrated in the setting sequence when the plant is
commissioned (refer to chapter Air-fuel ratio curves – settings and commissioning).
After the initial settings, program stops can be activated on the parameter level.
No. Parameter
Program stop
0 = inactive
1 = PrePurgP (Ph24)
208
2 = IgnitPos (Ph36)
3 = interval 1 (Ph44)
4 = interval 2 (Ph52)
The program stop function is maintained until manually deactivated. If the system halts
at one of the program stops, a message appears on the display of the AZL2....
Example: C:204 alternating with d:24 corresponding to program stop in prepurge
position.
Figure 41: Message in the case of program stop
7.5.5.8. Forced intermittent operation (<24 hours)
When forced intermittent operation is activated, the unit shuts down for a moment
after 23 hours and 45 minutes of uninterrupted operation, shutdown and followed by an
automatic restart.
Forced intermittent operation is a standard feature.
No. Parameter
239 Gas: Forced intermittent operation
0 = inactive
1 = active
279 Oil: Forced intermittent operation
0 = inactive
1 = active
339 Fuel 1 gas. Forced intermittent operation
0 = inactive
1 = active
379 Fuel 1 oil: Forced intermittent operation
0 = inactive
1 = active
7.5.5.9.

Low-fire shutdown

To prevent the boiler from being shut down under full or nearly full load conditions,
electronic air-fuel ratio control can run the burner to the low-fire position first when there
is no more request for heat (refer to chapter End of operating position).
Basic documentation LMV36...
7 Basic unit
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CC1P7544en
25.09.2013