Technical Instructions LMV Series
Document No. LV3-1000
Appendix A Page 6 SCC Inc.
Hot Standby on a Steam Boiler with an RWF55
Introduction
Hot standby is recommended on multi-boiler systems to maintain one or more backup boilers
close to operating temperature. Hot standby can be accomplished on an LMV3 with an RWF55
controller. The RWF55 has two functions:
• Control the load of the boiler based on steam pressure
• Control the hot standby based on shell temperature
The procedure and operation for using the RWF55 for both load control and hot standby is
described below.
Procedure
1. Wire the RWF55 to the LMV3 as shown in Figure 2.
Figure 2: LMV3 Hot Standby Wiring
2. 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.
These steps will ensure that when the boiler turns on in hot standby mode, it will always
operate at low fire.
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