LMV Series Technical Instructions
Document No. LV5-80
00
SCC Inc. Page 9 Appendix A
Hot Standby on a Steam Boiler with an RWF50 or RWF55 (continued)
Operation
1. When the hot sta
ndby switch is open, the LMV5 system is in hot standby mode. The
burner will turn on and off based on the limits set in the RWF5x controller. The contact
between X62.1 and X62.2 will be open. The LMV5 will be in operating mode “ExtLC X5-
03” and looking for a 3-position input for its firing rate command. Since line power from
terminal X5-03.4 has been directly connected to the terminal that decreases the firing
rate (X5-03.2), the LMV5 will stay at low fire until the burner turns off based on the
burner off point set in the RWF5x (PArA > HYS3).
2. When the hot standby switch is closed, the system is in normal operation and not in hot
standby. The contact between X62.1 and X62.2 will close, causing the LMV5 to change
to operating mode “IntLC”. The burner will be controlled based on the limits set in the
LMV5.
Important Notes
1. Any RWF5x controller model will suffice for this hot standby option.
2. The RWF5x is operating only during hot standby mode.
3. The internal load controller of the LMV5 is used during normal operation.
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