Siemens LMV51 Series Basic Documentation page 287

Siemens Building Technologies
HVAC Products
19.12 Setting notes
(Summary of the most important rules for setting O
19.12.1 Parameter settings
•
Parameterize all truly air-influencing actuators as air-influencing actuators
If changing the parameter settings, O
19.12.2 Setting O2 ratio control
•
Set sufficient excess O2
Set the amount of excess air of the ratio curve such that, whatever the
environmental conditions (combustion chamber and fuel pressure, tem-
perature and pressure of the combustion air), the set residual oxygen
content will lie above the O
Example:
O (%)
2
1
6
5
4
3
2
1
•
Parameterized load proportional to the fuel rate
The burner load parameterized at the curvepoints must be proportional to the ac-
tual burner load. To make the setting, determine the burner load with the help of
the fuel counter.
•
Curvepoint 1
The first curvepoint should have an adequate distance below curvepoint
means that the curve for reducing the air rate is also defined below point
guide value, point
be smaller than or equal to the low-fire load.
If, in the low-fire position, no further air reduction is possible (e.g. because the air
damper has already fully closed), curvepoint 1 must be selected as the low-fire
point. In that case, O2 trim control will only be performed up to curvepoint 2.
Basic Documentation LMV5...
19 Addendum 4: LMV52... with O2 trim control and O2 module
trim control must be readjusted.
2
setpoints required by O
2
Curvepoints
4
2 3
should lie at about half the load of point
trim control)
2
trim control.
2
5
Change of O
2
due to ambient conditions
O ratio control
2
O setpoint
2
O min value
2
100 %
. Point
ratio control
Load (%)
. This
. As a
should
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CC1P7550en
13.08.2004