GAS WORKING
Fault
The burner repeats the starting
cycle without lock out
During operation, the burner
stops in lock out
Lock out when burner stops
Ignition with pulsation
Possible cause
• Mains gas pressure is near the value to which . . . . .Reduce operating pressure
the min. gas pressure switch gas is adjusted.. . . . . .of minimum gas pressure switch.
The repeated drop in pressure which follows . . . . . .Replace the gas filter cartridge
valve opening causes temporary opening of the
pressure switch itself, the valve immediately
closes and theburner comes to a halt. Pressure
increases again, the pressure switch closes again
and the firing cycle is repeated. The sequence
repeats endlessly. And so on.
• Fault on air pressure switch . . . . . . . . . . . . . . . . . . .Replace
• Max. gas pressure switch operates. . . . . . . . . . . . . .Adjust or replace
• Flame remains in combustion head or flame . . . . . .Eliminate persistence of flame
simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .or replace control box
• Poorly adjusted head . . . . . . . . . . . . . . . . . . . . . . . .Adjust
• Poorly adjusted air damper, too much air . . . . . . . . .Adjust
• Output during ignition phase is too high . . . . . . . . . .Reduce
6
CAPITOLO
Recommended remedy
Maintenance
17