Siemens LMV3 series, Technical Instructions, Page: 202 / 224

Technical Instructions LMV Series
Document No. LV3-1000
Appendix A Page 10 SCC Inc.
Low Fire Hold with an RWF55 (continued)
Procedure – Hot Water Boiler with an RWF55 with Analog Output
1. Do the following:
On an LMV37 only: Place a jumper between terminals X5-03.2 and X5-03.4.
On an LMV36 only: Set parameter 204 to 2. If 2 is not an option (older
LMV36s), set parameter 204 to 0.
1. Set the following parameters in the RWF55:
ConF > Inp > Inp1 > SEn1 = type of RTD being used for temperature sensor
ConF > Cntr > CtYP = 2
ConF > AF > FnCt = 7
ConF > AF > AL = temperature to enable low fire hold
ConF > AF > HYSt = deadband around low fire hold temperature
ConF > OutP > FnCt = 4
ConF > OutP > SiGn = 1
2. Wire the LMV3 and RWF55 as shown in Figure 4:
Figure 4: Low Fire Hold via Analog Output on a Hot Water Boiler
See page 19 for an example of the low fire hold operation.