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Function (cont´d)
Expanding flame
burners with LOK16...
or LGK16...
Interrupted pilot burner
with LGK16...
14/24
Building Technologies Division
Infrastructure & Cities Sector
Short preignition time; followed by fuel release via terminal 18.
t3
TSA Safety time (part 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.
Only with LOK16...:
Postignition time (provided the ignition transformer is connected to terminal 15).
t3n
Interval until the fuel valve is released via terminal 19.
t4
(Burners using a pilot burner)
t3/t3´ Short preignition time; followed by release of fuel for the pilot burner via
terminal 17.
First safety time (ignition load)
TSA/TSA´
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
Burner operation (generation of heat)
B-C
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
Postpurge time (postpurging with fan (M2) connected to terminal 7).
t6
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
End of control sequence (= start position)
D-A
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.
(t6)
.
CC1N7785en
06.03.2012
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