750-265 38
Fig. 15. Interrupted pilot.
Fig. 16. Intermittent pilot.
Fig. 17. Direct burner ignition
M28035
STANDBY
PREPURGE
PFEP
4, 10, OR 15S RUN POSTPURGE
FLAME REQUIRED.
FAILURE TO IGNITE OPTIONS:
• LOCKOUT
• COUNT RECYCLES, THEN LOCKOUT
• COUNT RECYCLES, THEN DELAY MM:SS
• RECYCLE (NO LIMIT)
FLAME REQUIRED: LOCKOUT OR RECYCLE
CLEAR THE FAILURE-TO-IGNITE
RETRY COUNTER
=
RECYCLE DUE TO
FAILURE TO IGNITE
RECYCLE DUE TO FLAME
FAILURE IN MFEP
RECYCLE DUE TO FLAME
FAILURE IN RUN
IGNITER
PILOT
MAIN
PREIGNITION
(MAY BE ZERO)
IGNITER MAY BE ON THROUGHOUT PFEP, OR ONLY DURING FIRST HALF.
MFEP
5, 10, OR 15S
RUN STABILIZATION
(MAY BE ZERO)
M28036
STANDBY
PREPURGE
PFEP
4, 10, OR 15S RUN
POSTPURGE
FLAME REQUIRED.
FAILURE TO IGNITE OPTIONS:
• LOCKOUT
• COUNT RECYCLES, THEN LOCKOUT
• COUNT RECYCLES, THEN DELAY MM:SS
• RECYCLE (NO LIMIT)
FLAME REQUIRED: LOCKOUT OR RECYCLE
CLEAR THE FAILURE-TO-IGNITE
RETRY COUNTER
=
RECYCLE DUE TO
FAILURE TO IGNITE
RECYCLE DUE TO FLAME
FAILURE IN RUN
IGNITER
PILOT
MAIN
PREIGNITION
(MAY BE ZERO)
IGNITER MAY BE ON THROUGHOUT PFEP, OR ONLY DURING FIRST HALF.
RUN STABILIZATION
(MAY BE ZERO)
M28037
STANDBY
PREPURGE
DBI
FIXED AT 4S RUN
POSTPURGE
FLAME REQUIRED.
FAILURE TO IGNITE OPTIONS:
• LOCKOUT
• COUNT RECYCLES, THEN LOCKOUT
• COUNT RECYCLES, THEN DELAY MM:SS
• RECYCLE (NO LIMIT)
FLAME REQUIRED: LOCKOUT OR RECYCLE
CLEAR THE FAILURE-TO-IGNITE
RETRY COUNTER
=
RECYCLE DUE TO
FAILURE TO IGNITE
RECYCLE DUE TO FLAME
FAILURE IN RUN
IGNITER
MAIN
PREIGNITION
(MAY BE ZERO)
RUN STABILIZATION
(MAY BE ZERO)
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