Siemens LMV3 series User Manual

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.

Siemens LMV3 series Specifications

General

Brand	Siemens
Model	LMV3 series
Category	Control Unit
Language	English