Hot Standby With A Temperature Switch; Introduction - Siemens LMV5 Series Technical Instructions
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Technical Instructions
Document No. LV5-8000
Hot Standby with a Temperature Switch
Introduction
Hot standby is recommended on multi-boiler systems to maintain one or more backup boilers
close to operating temperature. A simple hot standby with an LMV5 is accomplished through
the use of a temperature switch. A temperature switch closes a contact which allows the
burner to release to modulation and exit hot standby mode. With proper wiring and parameter
setup, this simple device will create an effective hot standby with an LMV5 controller.
Table 3 describes the six different load controller operating modes in the LMV5.
Table 3: Description of LMV5 Load Controller Operating Modes
Label
ExtLC X5-03
IntLC
IntLC Bus
IntLC X62
ExtLC X62
ExtLC Bus
If any operating mode other than "IntLC" is used, a contact closure between terminals X62.1
and X62.2 will cause the LMV5 to revert back to operating mode "IntLC". This concept is
necessary to achieve a hot standby with a temperature switch.
Appendix A
Description
External load control,
firing rate from
3-position input
Internal load control,
setpoint set locally on
LMV5
Internal load control,
setpoint from Modbus
command
Internal load control,
setpoint from analog
signal on terminal X62
External load control,
firing rate from analog
signal on terminal X62
External load control,
firing rate from Modbus
command
Page 12
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Upon X62.1 – X62.2
Setpoint
Contact Closure
Change to "IntLC",
N/A
setpoint W1
Remain in "IntLC",
W1
setpoint W2
W3
Remote
setpoint
Change to "IntLC",
setpoint W1
N/A
N/A
LMV Series
SCC Inc.
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