Bentone B40 - Page 37

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Bentone B 30/B 40 J/K
Startup sequence
A Start command by «R»
«R» closes the start control loop between terminals 4 and 5
- The sequence switch starts to run
- Only prepurging, fan motor at terminal 6 receives power
- Pre- and postpurging, fan motor or flue gas fan at terminal 7 receives power on
completion of «t7»
- On completion of «t16», the control command for opening the air damper is
delivered via terminal 9
- Terminal 8 receives no power during the positioning time
- The sequence switch continues to run only after the air damper has fully closed
t1 Prepurge time with air damper fully open
- The correct functioning of the flame supervision circuit is checked during «t1»
- The burner control will initiate lockout if correct functioning is not ensured
With LAL2... / LAL3...:
Shortly after the beginning of «t1», the air pressure switch must change over from
terminal 13 to terminal 14
 otherwise, the burner control will initiate lockout
 start of the air pressure check
t3 Short preignition time
«Z» must be connected to terminal 16, release of fuel via terminal 18.
t3´ Long preignition time
«Z» connected to terminal 15.
With LAL1...
«Z» is switched on when start command is given.
With LAL2... / LAL3...
«Z» is switched on when «LP» changes over.
 no later than at the end of «t10»
- On completion of «t1», the LAL... drives the air damper to the low-fire position via
terminal 10
 the low-fire position is defined by the changeover point of auxiliary switch «m» in
the actuator
- During the positioning time, the sequence switch maintains its position
 until terminal 8 receives power via «m»
- The motor of the sequence switch is switched to the control section of the LAL...
 positioning signals delivered to terminals 8 now have no impact on the further
startup sequence and on subsequent burner operation
TSA Ignition safety time
On completion of «TSA», a flame signal must be present at terminal 22. It must be
available until controlled shutdown occurs
 otherwise, the burner control will initiate lockout and lock itself in the lockout
position