104
9 Appendix
Key to process sequence charts
Any condition
t1 Wait for gas safety interlock circuit air pressure monitor min. scan any
t2 Time for pressure build-up in the gas test line (only with valve leakage test activated) 2 sec.
t3 Servo drive running time 30-60 sec.
t4 Re-circulation damper delay 0-t5
t5 Aeration time 1-999 sec. adjustable
t6 Transformer pre-energise time 3 sec.
t7 1
st
safety period 4 sec.
t8 Stabilisation period 3 sec.
t9’ 2
nd
safety period 5 sec.
t9’’ 2
nd
safety period 3 sec.
t9’’’ Safety period 3 sec.
t9’’’’ Safety period 4 sec.
t10 Operating phase any
t11 Control mode any
t12 Time for pressure relief in the gas test line 3 sec.
t13 Post-purge time 0-999 s adjustable
t14 Control elements at base firing rate
t15 Post-combustion time 0-20 s** adjustable
t16 Flame extinguishing check 5 sec.
t17 Valve leakage test, gas valve 2 30 sec.
t18 Triac selftest
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