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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
19.12.3 Setting the O2 trim controller
•
Selecting the O2 min. value
The O2 min. value should be set as low as possible to ensure a high level of avail-
ability.
Above or at the O2 min. value, hazardous conditions may not
permanently occur.
Guide values: CO = 2,000 ppm, soot number 3.
The values can vary, depending on the type of plant.
•
Adequate distance between O2 setpoint and O2 min. value
The distance should be a minimum of 1...1.5 % O2. If a smaller distance is used,
the ratio curve must be set as accurately as possible, in accordance with subsec-
tion 19.12 Setting notes - «Setting O2 ratio control».
•
All O2 setpoints must be adjusted under the same environmental conditions
It is important to adjust the O2 setpoints at the same ambient temperatures. If,
later, individual setpoints are changed, all setpoints of the curvepoints must be re-
adjusted since environmental conditions will probably be different from those at the
time the initial settings were made.
19.12.4 Other notes
When firing on oil and using a VSD, the oil pump must be driven separately.
If this is not observed, the fan speed has an impact on the amount of oil delivered. This
can cause problems in connection with precontrol or O
2 trim control.
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