Siemens LMV3 series, Технические инструкции, Страница: 200 / 224

Technical Instructions LMV Series
Document No. LV3-1000
Appendix A Page 8 SCC Inc.
Low Fire Hold with an RWF55
Introduction
Low fire hold assists in preventing boiler damage from thermal shock. If an RWF55 is the load
controller with the LMV3, a low fire hold can be easily incorporated. With an RWF55, a low fire
hold is accomplished by breaking the increase load signal to the LMV3. The wiring and setup
for four cases will be described:
•
Steam boiler with an RWF55 with analog output
•
Hot water boiler with an RWF55 with analog output
•
Steam boiler with an RWF55 with 3-position output (LMV37 only)
•
Hot water boiler with an RWF55 with 3-position output (LMV37 only)
The wiring and setup of the RWF55 differs slightly depending on the mode selected as shown
on the following pages.