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B LB 382 BLU 3000.1 - 4000.1 PR/MD
LANDIS & STAEFA, Model LFL1.622 OPERATING CYCLE
Ref. Description
t1
Duration Waiting time for confirmation
t2
of air pressure
t3
Preventilation time
t4
Safety time
t5
Pressurizing time
Time for enabling operation of the
main gas valve on minimum capacity
t6
Time for enabling operation of the
main gas valve on maximum capacity
The control box starts the burner
fan, to carry out the prepurging of
the combustion chamber, and
cheks the vent air pressure throu-
gh the air pressure switch. At the
end of prepurging, the ignition
transformer cuts-in and generates
a spark between the electrodes. At
the same time the two gas valves
open (Vs safety valve and Vl working valve). The total safety, in case of missed ignition or casual burner's flame-out,
is granted by a ionisation probe which cuts-in and sets the burner shutdown within the safety time. In case of gas
lack or a major pressure drop, the minimum air pressure switch shuts down the burner.
Remove cover to gain access to the adjusting cams.The cams are to be adjusted through the suitable key provided for. Description:
Duration
8"
66"
2"
Gas manostat
Pressostato gas
4"
Fan motor
Motore ventilatore
10"
Pressostato aria
Air Switch
Trasformatore
10"
Ignition transformer
di accensione
Valvola gas
Gas valve
Consenso
Min/max capacity
min./max. potenza
enabling device
100%
Serranda aria
Air damper
Gas damper
Serranda gas
Rivelazione
Flame detector
di fiamma
Cut-out pilot lamp
Spia di blocco
LANDIS & STAEFA SQM 50.481A2 AIR DAMPER MOTOR
I
II
Cam VIII
III - Low flame opening position adjusting cam (Air)
is never used
IV - Not used cam
V
VI - Not used cam
VII - Not used cam
VIII - Not used cam
Normal operating cycle
Ciclo di funzionamento normale
t2
t3
t1
t4
t5
t6
min
0
- High flame opening position adjusting cam (Air)
- Min. flame opening position adjusting cam (Air).
- Not used cam
pag.16
Operating cycle in the event of
Ciclo di funzionamento
ignition failureNormal operating cycle
in mancanza di fiamma all'accensione
t2
t3
t1
t4
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