Siemens LMV 5 Series, Technical Instructions, Page: 194 / 374

Technical Instructions LMV Series
Document No. LV5 ‐ 1000
Section 6 Page 22 SCC Inc.
barometric pressure that existed during O
2
Control Curve commissioning, the manipulated variable must
change to keep the same %O
2
in the stack. An example is done below and illustrated in Figure 6 ‐ 9:
Air temperature during O
2
Control Curve commissioning = 80°F
Barometric pressure during O
2
Control Curve commissioning = 30.0 inHg
Maximum expected air temperature = 120°F (+40°F compared to commissioning)
Minimum expected air temperature = 30°F ( ‐ 50°F compared to commissioning)
Maximum expected barometric pressure = 31.5 inHg (+1.5 inHg compared to commissioning)
Minimum expected barometric pressure = 28.0 inHg ( ‐ 2.0 inHg compared to commissioning)
Using Figure 6 ‐ 8 and the information above, the following values can be found:
O2MaxManVariable = 13
O2MinManVariable = ‐ 16
Since other small factors exist that can change (heating value of the fuel, change in draft, etc.), it is
suggested that an additional 5% are added to the max and subtracted from the min, giving the following
settings:
O2MaxManVariable = 18
O2MinManVariable = ‐ 21
Figure 6 ‐ 9: Finding the Theoretical Max and Min Manipulated Variable for Given Conditions
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