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Expanding flame burn-
ers with LOK16... or
LGK16...
Interrupted pilot burner
with LGK16...
TSA / TSA´
10/20
Siemens Building Technologies
HVAC Products
t3 Short preignition time; followed by fuel release via terminal 18.
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...:
t3n
Postignition time (provided the ignition transformer is connected to terminal 15).
t4 Interval until the fuel valve is released via terminal 19.
(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)
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 «TSA´», «t3´» and «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 pi-
lot burner, since the pilot gas valve is closed on completion of «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 air damper actua-
tor.
C
Controlled shutdown by «R»
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 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 li-
ve during the following burner off period.
D-A End of control sequence (= start position)
When, on completion of «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.
CC1N7785en
15.10.2003
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