Siemens LMV5 Quick Start Manual page 68

Setting Special Positions and Burner Light off
After actuators are addressed and coupled, the special positions can be set. These must be set
before attempting to light the burner. The special positions are:
1) Home Position – sets the actuator positions when the LMV5 is in standby, Phase 12.
2) Prepurge Position – sets the actuator positions for prepurge, other than fuel actuators.
3) Ignition Position – sets the ignition position for actuators, can be different than low fire.
4) Postpurge Position – sets the postpurge position for all actuators, including fuel actuators.
Angular positions of all activated actuators and % for VSD are adjustable for each special position,
except for the fuel actuator at the pre-purge position. The angular position of the fuel actuator
remains unchanged from the home position during pre-purge. Please consult the parameter
worksheet (section 4-2) for specific information about setting each one of these special positions.
The service level password will be necessary to access these special positions.
After the special positions are set, the burner can be lit-off. Please see below for the recommended
light off procedure.
The LMV5 can hold the burner in the pilot phase (Interval 1, phase 44) as well as a number of
other phases with the "Program Stop" function. See parameter worksheet under Params & Display
> Ratio Control > ProgramStop
IMPORTANT
: Before lighting off a new burner for the first time it is recommended to shut the
main gas (oil) manual shutoff valve. Next, set the program stop to Phase 44 so
that the pilot can be adjusted and made to burn properly when the LMV5 stops its
sequence in Phase 44. The air damper can also be adjusted when the LMV5 is
stopped at ignition position in Phase 44.
After the pilot is tuned with the manual gas (oil) valve still shut, it is recommended
to change the program stop to Phase 52. The LMV5 will open the automatic main
gas (oil) valves and remove the pilot according to the start-up timings that were
set. A flame failure should result. This procedure will verify that the main valves
open when they should, and that the flame failure is recognized by the LMV5.
After the pilot is tuned and safety checks are done, the manual main gas (oil) valve can be opened
and the program stop can be left at Phase 52. This program stop will hold the LMV5 at the ignition
position and will enable the main fuel at the ignition position to be tuned the next time the LMV5 is
started. Phase 52 program stop can also be used for boil-out if desired.
Note: Once the program stop is deactivated, the LMV5 is released to modulate if a Fuel-Air Ratio
Curve is defined. Typically, a fuel air ratio curve is not defined by the burner / boiler OEM,
and the LMV5 will sit at ignition position until the fuel air ratio curve is set up.
To remove the possibility that the LMV5 will modulate the burner on a fuel air ratio curve
that was left in the LMV5, it is highly recommended that the LMV5 is put into manual load
control. This is done by placing the LMV5 in "Burner ON" mode under: Manual Operation>
Auto / Manual / Off and setting the load is set as low as possible under Manual Operation>
SetLoad. This must be done before the program stop is deactivated in order to stop
possible unwanted modulation.
LMV5 QSG Rev 4 Sec 4 Pg 12 www.scccombustion.com