Ygnis BLU 7000.1 PR Manuel D'instructions page 10

B 420010391600 BLU 7000. 1 - 12000. 1 PR / M D
LANDIS & STAEFA, Model LFL1.622-1.333 OPERATING CYCLE
Normal operating cycle
Ciclo di funzionamento normale
t1 t2
Gas manostat
Pressostato gas
Motore ventilatore Fan motor
Pressostato aria Air Switch
Trasformatore
Ignition transformer
di accensione
Valvola gas Gas valve
Consenso
Min/max capacity
min./max. potenza
enabling device
100%
Serranda aria
min
Air damper
0
Gas damper
Farfalla gas
Rivelazione
Flame detector
di fiamma
Cut-out pilot lamp
Spia di blocco
At the same time the two gas valves open (Vs safety valve and Vl Low flame 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:
t3
t4
t5 t6
LAN D I S & STAEFA SQM 50.481A2 AI R D AM PER M O TO R
Cam VI I I
i s never us ed
Operating cycle in the event of
Ciclo di funzionamento
ignition failureNormal operating cycle
in mancanza di fiamma all'accensione
t1 t2 t3
t4
I
- High flame opening position adjusting cam (Air)
I I - Limit switch for the air damper position at burner's shut down
I I I - Min. flame opening position adjusting cam (Air).
I V - Low flame opening position adjusting cam (Air)
V
- Not used cam
VI - Not used cam
VI I - Not used cam
VI I I- Not used cam
pag.10
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.
Duration
8"
66"
2"
4"
10"
10"