8
Start up test at burner start
At each burner start, a function test of the servomotors
and the air pressure switch is carried out. If a deviation
from the intended programme is detected, start up is
interrupted and the burner goes to lockout.
Low gas program
The gas pressure switch monitors the min. gas pressure
between the two valve seats of the W-MF. If the gas
pressure switch has not been activated due to low gas
pressure the burner start is interrupted. After a waiting
time of 10 minutes a re-start of the burner is attempted. If
the gas pressure is still too low, a third attempt at
restarting the burner will commence after a further waiting
time of 10 minutes. After the fifth unsuccessful attempt to
start the burner, the start will only be attempted after a
waiting time of one hour.
Valve proving
Following a controlled shutdown of the burner valve
proving is automatically activated. The combustion
manager sequentially checks for incorrect pressure
increase and decrease within the gas section between the
valves seats.
If the gas pressure increase is correct and no pressure
loss is detected, the burner goes to “Standby” and the
display shows OFF.
If the burner goes to lockout or shuts down due to power
failure, valve proving is carried out at the next burner start:
• Burner shuts down during start up phase
• Valve proving
• Automatic restart
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