Installation and operating instruction
Combustion manager W-FM 100 und W-FM 200
6 Operation
83054802 1/2018-07 La
107-228
O
2
control variable limit
The control variable can be limited to ensure that O
2
trim reacts to faults during O
2
measurement (e. g. false air in the flue gas, O
2
sensor or air regulator blocked, etc.)
and does not try to compensate for these.
Upper limit:
O2MaxManVariable
Lower limit:
O2MinManVariable
The reaction when the control variable limit is reached depends on the operating
mode set [ch. 6.10.1].
Operating mode
Reaction
O2 controller
The W-FM carries out a safety shutdown with subsequent
lockout.
conAutoDeac
The W-FM carries out a safety shutdown with subsequent
repetition and deactivated O
2
controller. The burner oper-
ates to the compound curves.
The control variable limit results from the maximum expected temperature or air
pressure fluctuations based on the conditions at the time of commissioning. If the
control variable is set too low this will lead to a safety shutdown if climatic fluctu-
ations are too great. The control variable limit can be determined using the follow-
ing diagram.
Example
3
O2MaxManVariable
Example
4
O2MinManVariable
Expected temperature fluctuation
(1
(-20 K … +30 K):
+30 K
-20 K
Expected air pressure fluctuation
(1
(-60 mbar … +40 mbar):
-60 mbar
+40 mbar
Control variable limit from diagram:
14.7 %
-11.6 %
(1
Based on the air temperature and pressure during commissioning.
10
-10
-20
-30
20
10
20
30
40
50
60
-10
-20
-30
-40
-50
-60
-100
-80
-60
-40
-20
0
+1
00
-100
-60
-40
-20
-80
0
+20
+4
0
+6
0
+8
0
+100
+20
+40
+60
+80
4
2
1
3
1
Temperature fluctuation [K]
2
Control variable limit [%]
Summary of Contents for W-FM 100
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