Sequence Of Operation - Siemens LMV3 series Technical Instructions

LMV Series
Revert to Pilot - LMV37 only (continued)
2. Set the following parameters in the RWF55 controller. For more information, obtain
Siemens Document No. U7867 for the RWF55 at www.scccombustion.com.
ConF > Cntr > CtYP = 2
ConF > Cntr > SPL = setpoint range lower limit
ConF > Cntr > SPH = setpoint range upper limit
OPr > SP1 = normal operation setpoint
PArA > HYS1 = burner on for normal operation
PArA > HYS3 = burner off for normal operation
ConF > InP > InP1 > SEn1 = type of pressure or temperature sensor
ConF > AF > FnCt = 5
ConF > AF > AL = Revert to pilot threshold
ConF > AF > HYSt = Deadband around revert to pilot threshold
ConF > OutP > SiGn = 1
3. Set the following parameters in the LMV37 controller. For more information, see
Section 3 of this document.
Parameter 191 = 1
Parameter 192 = Minimum pilot on time
Parameter 193 - Maximum pilot on time

Sequence of Operation

1. The LMV37 is in standby.
2. Pressure or temperature falls. The contact between 6N and 6P on the RWF55 closes,
energizing terminal X5-03.2. The LMV37 is still in standby.
3. Pressure or temperature continues to fall. The contact between terminals 1N and 1P on
the RWF55 closes, energizing terminal X5-03.1.
4. The LMV37 goes through the startup sequence and lights off normally.
5. The LMV37 reaches normal operation (phase 60). Pressure or temperature rises to the
switching point for the "revert to pilot" function. The contact between terminals 6N
and 6P on the RWF55 opens, de-energizing terminal X5-03.2.
6. The LMV37 is driven to low fire (phase 62). Then the LMV37 is driven to the ignition
position P0 (phase 64).
SCC Inc. Page 25
Technical Instructions
Document No. LV3-1000
Appendix A