17/28
Building Technologies Division
CC1N7785en
20.11.2017
Startup program (cont’d)
Interrupted pilot burner with
LGK16
(burners using a pilot burner)
t3
t3‘
Short preignition time
; followed by release of fuel for the pilot burner via terminal 17.
Note! (Only for LGK)
For use in applications in dual-fuel burners or oil burners, the oil supply must be equipped with two
shutoff valves connected in series.
Observe the following:
EN 298:2012, Section 7.101.3.3
Prepurge time for oil burner control systems and the corresponding
application standards
.
TSA
TSA‘
First safety time
(ignition load)
On completion of the safety time latest, a flame signal must be present at the input of the flame signal
amplifier, or else the burner control will initiate lockout.
t4
t4‘
Interval
until the fuel valve at terminal 19 is released (start load of the main burner).Times safety time
(TSA´), short preignition time (t3´) and interval (t4´) are only programmed by burner controls type
LGK16.335...
and
LGK16.635...
t9
Second safety time
On completion of the safety time, the main burner must have been ignited by the pilot burner, since the pilot
gas valve is closed on completion of second safety time (t9).
B
Operating position of the burner
B - C
Burner operation
(generation of heat)
During burner operation, the load controller drives the air damper to the nominal load or low-fire position,
depending on heat demand. Here, the nominal load is released by auxiliary switch (v) in the actuator.
C
Controlled shutdown by control thermostat or pressurestat
In the case of controlled shutdown, the fuel valves are immediately closed and, at the same time, the
sequence switch starts again to program the postpurge time
(t6).
t6 Postpurge
time
(postpurging with fan (M2) connected to terminal 7).
Shortly after the start of the postpurge time, voltage at terminal 10 is reinstated, so that the air damper is
driven into the MIN position. The full closing of the air damper starts only shortly before the completion of the
postpurge time initiated by the control signal on terminal 11, which also remains live during the following
burner off period.
t13
Permissible afterburn time
During permissible afterburn time (t13), the flame signal input may still receive a flame signal
No lockout
D - A
End of control sequence
(= start position)
When, on completion of postpurge time (t6), the sequence switch has reset the control contacts to their start
positions, thereby switching itself off, the detector and flame simulation test is started again. However, during
the burner off period, lockout can occur only if the faulty flame signal lasts a few seconds. Hence, short
ignition pulses of the UV detector caused by cosmic radiation do not initiate lockout.
