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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
19.11.3 Direct entry of O
2
min. values
If the limit values of a plant are known, and if the CO limit need not be remeasured, the
O2 min. values can be entered directly.
P
o
i
n
t
:
2
O 2 - M i n V a l u e : 1 . 2
P - A i r M a n : 0 . 0
On the first line, «Point», select the point number to be changed and confirm with
Enter
(point 1 can be adjusted). With the second line, «O2 Min Value», the O2 min. value can
be directly parameterized. The points will only be approached if, previously, setting
choice «P-Air Man» has been used.
19.11.4 Measuring the O
2
min. values by lowering the air rate
On the first line, select the point number and confirm with
Enter
. Now, select line «P-Air
Man» and confirm. After confirmation with
Enter
, the ratio control system approaches
this point on the parameterized ratio curve, that is, air rate reduction «P-Air Man» will
be set to «0». The display on the second line changes to «Actual O
2
Value», which will
then be displayed.
P
o
i
n
t
:
3
A c t O 2 V a l u e : 1 . 4
P - A i r M a n : 2 1 . 3
By readjusting the air rate «P-Air Man», the amount of combustion air and thus the O2
value can be reduced. «P-Air Man» corresponds to the relative air rate reduction. Dur-
ing the readjustment, all actuators on the curve parameterized as air-influencing will
travel to the relevant positions. When the O
2
min. value is found, the measured «Actual
O
2
Value» will be entered as the «O
2
Min Value» by pressing
Enter
.
