Siemens LMV5 Quick Start Manual page 117
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8) If gas valve proving is performed on startup (immediately after phase 30) the actuators will be in prepurge position. If gas valve proving is
performed on shutdown (immediately after phase 62), the actuators will be in the same position as they were in phase 62. The actuators
will not move during valve proving.
9) Shortly after post purge is complete, the air pressure switch must open causing input (terminal X3-02.1) to de-energize. The LMV5 will
wait about 30 seconds in phase 10 (driving to home position) for the switch to open before the LMV5 goes into alarm. This done to check
for welded contacts in the air pressure switch. If air pressure switch alarms are encountered in phase 10, Increasing the setpoint of the air
pressure switch typically cures this problem.
10) The LMV5 can be configured for different reactions to extraneous light (a flame signal when there should not be one). Depending on how
parameters ReacExtranLight and ExtranLightTest are configured, the LMV5 can lockout, block the start, or ignore extraneous light
altogether.
11) If direct start is enabled and there is a call for heat after phase 62, the LMV5... will omit phase 78 and will go to phase 79. In Phase 79,
the LMV5... will check the blower air pressure switch with the blower still running by using a three-way solenoid valve (APS checking).
If the switch checks out the LMV5... will then proceed directly to Phase 24, driving to prepurge.
12) Safety Time 1 is defined as the overlap of the ignition spark and pilot valve. Safety Time 2 is defined as the overlap of the pilot valve and
the main fuel valves. Interval 1 and Interval 2 are stabilization times for the pilot and main flames, respectively.
13) Continuous purge can be used for multiple burner applications where return heat may be a problem.
14) Actuator position is checked by using one of three methods. The method depends upon the phase of the sequence. Position Required
to Proceed means that the actuators must achieve and hold a certain position for the sequence to proceed. Dynamic Position Checking
means that the actuator is evaluated by a "time and distance from target" algorithm. The further the actuator is away from its target, the
less time the actuator is permitted to be in that position. Run -Time Position Checking means that the actuator is expected to be at a
certain point in a certain amount of time (based off of the run-time of the actuator).
15) For direct spark oil fuel trains, spark (ignition) can occur during prepurge if IgnOilPumpStart is set to Phase 22.
IMPORTANT: The Extraneous Light Test should ALWAYS be enabled for gas / oil fired boilers.
The only time parameter ExtranLightTest should be set to deactivated are for applications such as waste incineration.
LMV5 QSG Rev 4
Sec 4
Pg 61
www.scccombustion.com
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