Honeywell S9371A - Manual (Page 13)

S9360A, S9361A, S9370A, S9371A INTEGRATED BOILER CONTROLLERS
13 69-2076—01
Fig. 10. Operating Sequence.
IGNITION
SEQUENCE
IDLE
ALL OUTPUTS OFF
CHECK LEAKAGE/
SET FLAME BIAS
WAIT LIMIT
SWITCH CLOSE
CHECK DAMPER/
PRESSURE SWITCH
OPEN
DRIVE DAMPER/
INDUCER WAIT FOR
SWITCH CLOSE
PREPURGE
SPARK
TURN PILOT VALVE ON
CHECK FLAME
PRE-TRIAL
SOFT LOCKOUT
PROVE FLAME
STOP SPARKING
FLAME STABILIZATION
TURN MAIN VALVE ON
RUN
POSTPURGE
WATER TEMPERATURE LOW AND THERMOSTAT ACTIVE
BIAS DONE
WATER TEMP.
HIGH OR CALL
FOR HEAT LOST
SWITCH OPEN
SWITCH CLOSE
SWITCH OPEN
FLAME DEB ON
FLAME DEB OFF
TIME OUT
TIME OUT OR
MANUAL RESET
LIMIT SWITCH
OPEN
TIME OUT
FLAME SENSED
FLAME PROVED
TIME OUT
WATER TEMPERATURE HIGH OR THERMOSTAT CALL FOR HEAT LOST
RETRY DELAY TIME OUT A
TIME OUT
RECYCLE DELAY
DAMPER/
PRESSURE
SWITCH OPEN
CHECK FLAME
POST-TRIAL
FLAME DEB ON
FLAME DEB OFF
FLAME LOST
A
TIME OUT
A
TIME OUT
TIME OUT
B
B
CIRCULATOR ON
CIRCULATOR OFF
THERMOSTAT CALL FOR HEAT LOST
IDLE
ALL OUTPUTS OFF
THERMOSTAT CALL FOR HEAT ACTIVE
CIRCULATOR
CONTROL
M27073
LIMIT SWITCH CLOSE