18
CHAPTER
6
Maintenance
Fault
Possible cause
Recommended remedy
The burner repeats the starting
cycle without lock out
• 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.
During operation, the burner
stops in lock out
• Fault on air pressure switch . . . . . . . . . . . . . . . . . . .Replace
• Max. gas pressure switch operates. . . . . . . . . . . . . .Adjust or replace
Lock out when burner stops
• Flame remains in combustion head or flame . . . . . .Eliminate persistence of flame
simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .or replace control box
Ignition with pulsation
• Poorly adjusted head . . . . . . . . . . . . . . . . . . . . . . . .Adjust
• Poorly adjusted air damper, too much air . . . . . . . . .Adjust
• Output during ignition phase is too high . . . . . . . . . .Reduce
Summary of Contents for DB 4 SM BLU
Page 2: ......
Page 39: ...1...
Page 48: ...10 4 4 1 D7543 C GF HPG LPG MM PA PGM PGm RG SRV VE VPS VR VS 0 5 4 bar 500 mbar 12...
Page 49: ...11 4 4 2 DANGER WARNING MB PA PGM SM SO TA TB D7904 13...
Page 51: ...13 5 5 3 1 4 2 3 5 6 7 1 2 0 3 20 4 5 20 130 1 4 5 4 130 19 18 D1500 3 2 4 1 19 1 2 3 4 D1499...
Page 52: ...14 5 MAN 3 1 130 90 2 19 2 19 20 2 2...
Page 54: ...16 5 5 7 6 A 100 A 5 8 1 2 3 4 5 1 2 3 4 5 6 D3097 23 A...
Page 55: ...17 6 6 1 1 2 3 VR VR VS VR WARNING DANGER...
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