Siemens LMV3 series - Low Fire Hold: Hot Water Boiler with 3-position Output

Technical Instructions LMV Series
Document No. LV3-1000
Appendix A Page 12 SCC Inc.
Low Fire Hold with an RWF55 (continued)
Procedure – Hot Water Boiler with an RWF55 with 3-position Output (LMV37 only)
1. Set the following parameters in the RWF55:
ConF > Inp > Inp1 > SEn1 = type of RTD being used for temperature sensor
ConF > Cntr > CtYP = 1
ConF > AF > FnCt = 7
ConF > AF > AL = temperature to enable low fire hold
ConF > AF > HYSt = deadband around low fire hold temperature
2. Wire the LMV37 and RWF55 as shown in Figure 6:
Figure 6: Low Fire Hold via 3-position Output on a Hot Water Boiler
See page 19 for an example of the low fire hold operation.