Siemens LMV5 Series Technical Instructions page 106

LMV Series
6) If parameter OilPumpCoupling is set to Magnetcoupl, the output for the oil pump can be energized in Phase 22 or in Phase
38, depending upon how parameter IgnOilPumpStart is set. If parameter OilPumpCoupling is set to DirectCoupl, the output
will energize with the blower and de‐energize 15 seconds after the blower de‐energizes.
7) 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.
8) If parameter AirPressureTest is set to activated, the air pressure switch must open after postpurge is complete, 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 is 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. If
AirPressureTest is set to deactInStby, the air pressure switch is not checked in phase 10 or 12, but the switch must be open
or the LMV5 will not start when it receives a call for heat.
9) 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
startup sequence, or ignore it altogether. The extraneous light test should always be enabled for gas / oil fired boilers. The
only time parameter ExtranLightTest should be set to deactivated is for applications such as waste incineration.
10) 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 position).
11) 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.
12) If parameter ContinuousPurge is set to activated, fan output X3‐01.1 will be energized in all phases. Typically this is used in
burner applications where return heat may be a problem.
SCC Inc. Page 48
Technical Instructions
LV5‐1000
Section 3