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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 8 Commissioning instructions for the LMV5... system 13.08.2004
Modulating burner with pressure control
For the output step, any output value in % can be predefined. 100 % divided by the
output step gives the number of possible steps.
Parameters: Shock protection on / off
ColdStartOn
activated
Shock protection activation level
ThresholdOn
40 % of setpoint
Output step (only for modulating opera-
tion)
StageLoad
10 % of burner output
Setpoint step modulating
StageStep_Mod
10 % of setpoint
Max. time modulating per step
MaxTmeMod
5 minutes
Shock protection deactivation level
ThresholdOff
80 % of setpoint
Spacing of temperature lines
corresponds to the setpoint steps
from the actual setpoint, e.g. 10 % = 1 bar
Manipulated
variable
Actual value
Setpoint
Threshold OFF
Threshold ON
Load steps
e.g. 15 %
7550d30E/0502
10 bar = 100 %
8 bar = 80 %
7 bar
6 bar
5 bar
4 bar = 40 %
Load 85 %
Load 70 %
Load 55 %
Load 40 %
Burner start at
low-fire, e.g. 25 %
1. 2.
Burner off,
actual value
below
threshold ON.
Burner will be
switched on
Setpoint step not reached,
but max. time exceeded.
Therefore, increase of
manipulated variable by
load step,
e.g. MaxTmeMod = 5 min.
Setpoint step is reached
before max. time has elapsed.
Increase of manipulated variable
by load step.
⇒
Actual value reached.
Threshold OFF
Change to control
Menu level 1 Menu level 2 Menu level 3 Menu level 4 Menu level 5 Menu level 6
Params & Display
LoadController
ColdStart
ColdStartOn
ThresholdOn
StageLoad
StageStep_Mod
StageStep_Stage
MaxTmeMod
MaxTmeStage
ThresholdOff
Example
Example (cont’d)
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