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From
page 1
IGNITION
When low fire purge is
completed by flame
safeguard, PTFI begins
Wait for AUTO
signal from flame
safeguard
Move to LOW FIRE position
MODULATION
During modulation (AUTO or
MANUAL), if at low fire output low
fire signal (D). If at high fire output
high fire signal (8). (Indication
purposes)
Profile selected
Burner switch
closed
PCV below cut-
out?
AUTO signal
from flame
safeguard on?
Go to low fire
position. Output
low fire signal (D)
Drive servos to low fire
position
Go To STATE 01 after
NO profile select
NO
NO
NO
Digital Input or Keypad
Low Fire has priority if
AUTO signal on
State 15
State 16
State 17
NO
State 11 – State 14
reserved for future –
ignition and main light off
sequence (PTFI, PILOT,
MTFI, MFEP)
AUTO
CYCLE COMPLETE
YES
YES
YES
YES
NO
NO
Servos at LOW
FIRE
Open operating control relay
Flame safeguard begins
post purge.
