35
Bentone B 30/B 40 J/K
6.2 Function LAL
2-stage expanding flame burner Modulating expanding flame burner
Legend BV... Fuel valve M... Fan or burner motor
FS Flame signal amplifier R Control thermostat or pressurestat
LK Air damper RV Modulating fuel valve
LR Load controller Z Ignition transformer
General
The following features of the LAL... afford a high level of safety:
- Detector and flame simulation test are restarted on completion of the afterburn time
«t13». Open or not fully closed fuel valves immediately initiate lockout at the end of
afterburn time «t13». The test ends on completion of the prepurge time «t1» of the
next startup sequence
- The correct functioning of the flame supervision circuit is automatically checked
during each burner startup sequence
- The control contacts for the release of fuel are checked to ensure they have not
welded postpurge time «t6»
- A built-in unit fuse protects the control contacts against overloads
Control of the burner
- Burner operation with or without postpurge
- Fan motors with a current draw of up to 4 A can be connected directly starting
current max. 20 A (for max. 20 ms)
- Separate control outputs for
– preignition from start command
– postignition until shortly before the burner startup sequence is completed
– short preignition with postignition up to the end of «TSA»
- Separate control outputs for the actuator’s positioning directions «OPEN», «CLOSE»
and «MIN»
- Checked air damper operation to ensure prepurging with the nominal air volume
- Checked positions:
- «CLOSED» or «MIN» on startup low-fire position
To Next Page
Loading...
