CleaverBrooks CFC-1000 User Manual

CB FALCON
59 750-265
Fig. 24. Intermittent pilot.
Fig. 25. Direct burner ignition
Table 31. Burner Control Safety Parameters. (Continued)
Parameter Comment
Igniter on during Pilot Flame Establishing Period or First half of PFEP
This parameter is not needed and ignored if DBI (Direct Burner Ignition) is selected.
Otherwise the igniter may be on throughout the PFEP, or only during the first half of it:
• 2 seconds for a 4 second PFEP time,
• 5 seconds for a 10 second PFEP time,
• 7 seconds for a 15 second PFEP time.
When the igniter is external, it is on continuously during the defined period. However when
the igniter is selected as the internal spark generator then, during its on time as defined by
this parameter, it actually is intermittently on, then off, then on, then off, with each state
lasting 1/4 second. (This is done because flame cannot be sensed while the igniter is on, due
to hardware limitations, so flame sense and igniter spark are done alternatetly at a 1/4
second rate.)
Pilot type Interrupted, Intermittent, DBI, Direct Burner Ignition Pulsed
Preignition time hr:mm:ss
Pilot flame establishing period
(PFEP)
4, 10, or 15 seconds
This parameter is ignored if DBI is selected. Otherwise there are three choices for the
duration of PFEP: 4, 10, or 15 seconds.
Flame must be on at the end of this period or a response occurs (see “Ignite failure response”
on page 60).
STANDBY
PREPURGE
PFEP
NURS51 RO ,01 ,4
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)
STANDBY
PREPURGE
DBI
NURS4 TA DEXIF
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)

CleaverBrooks CFC-1000 Specifications

General

Brand	CleaverBrooks
Model	CFC-1000
Category	Boiler
Language	English