Siemens LMV5 Series Technical Instructions page 144
Linkageless burner management system
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Technical Instructions
Document No. LV5‐1000
d. Temperature / Time‐based Stepping Start Combination
This method combines methods b and c and if set correctly, is the fastest way to safely
warm the boiler. The settings are similar to method b, but now parameter
MaxTmeMod is set to have an effect (10 minutes for example). When this is done, the
maximum time that a step‐up in load will take is 10 minutes, regardless of the
temperature change. If the temperature change defined by StageSetp_Mod happens
before the 10 minutes elapses, then the temperature change will trigger the step‐up in
load.
When this mode is used, time usually triggers the load steps at the start of boiler
warming and temperature change usually triggers the load steps closer to the
ThresholdOff temperature. This is due to the more rapid rise in boiler temperature at
higher firing rates.
After parameters are set for one of the methods above, set parameter ColdStartOn to activated.
5.
The next time the burner is started and the water temperature is below the ThresholdOn
temperature, cold start should engage.
Below are typical settings for each of the four ways cold start can be set up.
Example: Steam Boiler with an Additional Temperature Sensor
Parameter
ColdStartOn
ThresholdOn
StageLoad
StageSetp_Mod
StageSetp_Stage
MaxTmeMod
MaxTmeStage
ThresholdOff
AdditionalSens
Temp. ColdStart
Setp AddSensor
Release Stages
The following page shows an example of a time‐based stepping start.
Section 4
Low Fire Hold
Temp‐based
0%
N/A
N/A
63 min
Figure 4‐8: Typical Cold Start Parameter Settings
Page 26
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Time‐based
Activated
50% (= 150°F)
5%
5%
5%
100%
Staged Operation Only
5 min
Staged Operation Only
80% (= 240°F)
Pt1000
Read Only
300°F
Staged Operation Only
LMV Series
Temp/time‐based
5%
10%
10 min
SCC Inc.
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