Operation; Example - Siemens LMV5 Series Technical Instructions

LMV Series
Low Fire Hold with an RWF55 (continued)

Operation

1. When the boiler temperature falls below the low fire hold temperature threshold
(AL - 1/2 HYSt), contact K6 opens and prevents the LMV5 from increasing the firing rate.
This is the case for either analog or 3-position output from the RWF55.
2. Once the boiler warms up above the low fire hold threshold (AL + 1/2 HYSt), contact K6
closes and the burner modulates according to the PID settings of the RWF55.

Example

Low fire hold threshold settings:
AL = 180
HYSt = 10
Figure 8: Behavior of Contact K6 when Using an RWF55 for Low Fire Hold
SCC Inc. Page 19
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Technical Instructions
Document No. LV5-8000
Appendix A