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4 Design and Functions
should be checked, as the UV tube is subject to a natural ageing process and towards the end
of its life span (ca. >10.000 h at an ambient temperature of <50 °C) it is prone to malfunction.
To check that the flame detector is sound, we recommend the following procedures be fol-
lowed:-:
• When starting the burner sequencer, the flame scanner must be shaded - after ending of
the safety time the burner sequencer must run to fault condition!
• When starting the burner sequencer, the flame scanner must be lighted up by an external
UV radiation e.g. pocket lighter or gas flame (ambient light/room illumination is not suffi-
cient) – the burner sequencer must run to fault condition during pre-purge period!
• In BURNER OPERATION the flame scanner must be shaded – depending on the burner
sequencer’s type, the burner sequencer must run to fault condition either after restarting
at the end of the safety time or directly after shading the flame scanner.
Disposal Instructions
The flame detector is equipped with electrical and electronic components and must be dis-
posed separately from household waste. Follow the local authority regulations for electrical
component waste disposal.
4.4 Process Sequence Charts
Key to process sequence charts
Any condition
t1 Waiting for safety interlock chain gas, scan of air pressure monitor min. any
t2 Time for pressure build-up in the gas test line (available with activated leakage test) 2,4 s
t3 Actuator running time 30 s - 60 s
t4 Delay of the recirculation damper 0 - t5
t5 Pre-purge period adjustable
t6 Pre-ignition time adjustable
t7 1
st
safety period 3 s gas/5 s oil
t8 Stabilisation period adjustable
t9’ 2
nd
safety period 3 s gas/5 s oil
t10 Operating phase any
t11 Control mode any
t12 Time for pressure relief in the gas test line 3 s
t13 Post-purge period
If a post-purge time after a flame fault (regulation in China) is set with parameter 339,
the BT300 cannot perform a fault reset during this time.
adjustable
t14 Control elements at base load/firing rate
t15 After burning time adjustable
t16 Checking flame extinction 5 s
t17 Leakage test, gas valve 2 30 s
** Recirculation is released as soon as the flue gas threshold P322 is reached and the
delay time in P331 has expired after reaching operation position (base firing-rate/
control).
CPI Close Position Indicator (UK/AU)
Limit switch on gas valve 2 which indicates that gas valve 2 is closed.
POC Prove Of Closure (US)
Limit switch on gas valve 2 which indicates that gas valve 2 is closed.
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