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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 19 Addendum 4: LMV52... with O2 trim control and O2 module 13.08.2004
P o i n t
S t o r e - > E N T E R
C a n c e l - > E S C
At curvepoint 2 and at the highest curvepoint, the system adapts itself when storing.
This is accomplished by measuring the delay time (τ) of the boiler plant. Based on
these values, the PI control parameters, the controller locking time after load readjust-
ment and the min. value delay for the O
2 monitor will be calculated. To measure the
time constant (τ), the burner will be driven back to the ratio curve. With the other curve-
points, the system returns to the ratio curve without adaption after setting the O
2 set-
point. After setting all points, O
2 trim control can be activated.
19.11.6 Checking and changing the controller parameters
The adapted controller parameters and the measured time constant (τ) of the boiler can
be viewed on the «Controller parameters» menu, and changed, if required.
The O2 setpoint must lay at least 0.5 % above the O2 min. value and 1 % below the O2
ratio value.
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