Siemens LMV3 series, Технические инструкции

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Technical Instructions LMV Series
Document No. LV3-1000
Appendix A Page 28 SCC Inc.
Revert to Pilot - LMV37 only (continued)
Important Notes
1. When the “revert to pilot” function is enabled, float / bump load control via terminal
X5-03 is no longer possible. Input X5-03.3 is no longer used and input X5-03.2 is re-
purposed as the input signal for the “revert to pilot” function.
2. The primary purpose of the maximum pilot on time is so that a burner cannot operate in
the “revert in pilot” mode indefinitely.
3. The secondary purpose of the maximum pilot on time is to protect pilot burners that
may not be rated for continuous operation.
4. The purpose of the minimum pilot on time is to provide a deadband so that the burner
does not constantly revert to pilot and then light off the main burner again repeatedly.
5. Once a “revert to pilot” sequence is initiated, the entire “revert to pilot” sequence must
be followed through, including the minimum pilot on time.
6. It is necessary to have the ignition transformer and the pilot valve energized when the
main valves (V1 and V2) are closed since the main flame extinguishing typically causes a
small pressure pulse that could blow out a pilot that is not supported by an ignition
transformer spark.
7. The flame signal is checked at all times during the “revert to pilot” sequence.