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A
Startup
B
Operating position
Control signals delivered by the burner control
Permissible input signals
Required input signals:
If these signals are not present at the points in time marked by symbols or during the shaded periods of
time, the burner control will interrupt the startup sequence or initiate lockout
•
Valid for expanding flame burners
••
Valid for burners with a pilot burner which is shut down after the main burner has ignited
1)
When used with QRA53... / QRA55..., earthing of terminal 22 is mandatory
2)
Do not press EK for more than 10 seconds
Lockout indication positions when there is no input signal (refer to «Control sequence in the event of
faults»):
No start
Abortion of startup sequence
Abortion of startup sequence
Lockout (fault in the flame supervision circuit)
1
Lockout (no flame)
2
Lockout (no flame)
P
Lockout (no air pressure)
Time table
t1
Prepurge time with air damper fully open
TSA
Safety time or first safety time with burners using t8
a pilot burner
TSA´
Safety time or first safety time with burners using t9
a pilot burner
t3
Preignition time
t3´
Preignition time
t3n
Post-ignition time (ignition transformer
connected to terminal 15)
t4
Interval from the start of «TSA» or «TSA´» to the t12
valve connected to terminal 19
t4´
Interval from the start of «TSA» or «TSA´» to the t13
release of the valve connected to terminal 19
t5
Interval from the end of «t4» or «t4´» to the
release of the load controller or valve at
terminal 20
t6
Postpurge time (identical with the permissible
afterburn time «t13»)
*
Times TSA´, t3´ and t4´ are only programmed by burner controls LGK16.335... and LGK16.635...
14/20
Siemens Building Technologies
HVAC Products
C
Controlled shutdown
D
End of control sequence
t7
Switch-on delay for fan motor M2
Duration of startup sequence excluding «t11»
and «t12»
Second safety time with burners using a pilot
burner
t10
Interval from the start to the beginning of the
air pressure check
t11
Running time of air damper into the fully open
position
Running time of air damper into the low-fire
position
Permissible afterburn time
t16
Interval from the start to the OPEN
command for the air damper
t20
Interval to the self-shutdown of the sequence
switch
max.
Safety time in the event of loss of flame
during operation
CC1N7785en
15.10.2003
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