CleaverBrooks CFC-500 Operation, Service And Parts Manual page 184

CB FALCON
Parameter
Main flame establishing period
(MFEP)
Ignite failure response
Ignite failure retries
Ignite failure delay
MFEP flame failure response
Run flame failure response
Fan speed error response
Pilot test hold
Ignition source
Run stabilization time
750-265
Table 31. Burner Control Safety Parameters. (Continued)
5, 10, or 15 Seconds
This parameter only appears if Pilot type is Interrupted. Three choices of the MFEP time are
provided: 5, 10, or 15 seconds.
Flame must remain on throughout the MFEP, otherwise a response occurs (see "MFEP flame
failure response" on page 60).
Lockout, Recycle & Hold After Retries, Recycle & Lockout After Retries, Continuous Recycle
If a failure to ignite is detected at the end of the Ignition period, then there are four possible
responses:
• Lockout
• Recycle & hold after retries—the burner control recycles to the beginning of purge and
counts how many times this has occurred. If the retry count has been reached, a hold
occurs with the system purging. After the hold, the retry count is cleared and the burner
tries (and retries) again.
• Recycle & lockout after retries—the burner control recycles to the beginning of purge and
counts how many times this has occurred. If the retry count has been reached, a lockout
occurs.
• Continuous recycle—the burner control recycles without limit.
The retry counter is cleared during Standby (no demand), during the hold imposed by the
retry counter, or if flame is achieved.
3, 5
This parameter provides the number of retries, either 3 or 5.
MM:SS
When Recycle & hold after retries is selected, this parameter provides the delay time for the
hold.
Lockout, Recycle
During the MFEP state, if the flame fails there is a choice for the response. If lockout is
selected, a flame failure during MFEP causes a lockout. However, if recycle is selected, the
burner control shuts off the fuel and recycles back to the beginning of prepurge, then
continues with the normal burner startup process (prepurge, ignition, then run) to attempt to
light the burner again.
Lockout, Recycle
During the Run state if flame fails then there is a choice for the response. If lockout is
selected for flame failure during Run. However, if recycle is selected, the burner control shuts
off the fuel and recycles back to the beginning of prepurge, then continues with the normal
burner startup process (prepurge, ignition, then run) to light the burner again.
Lockout, Recycle
If fan fails in Run and recycle is selected then the burner control recycles back to the
beginning of Prepurge, then continues with the normal burner startup process to attempt to
bring the fan up to speed again.
Enable, Disable
This parameter is provided to support the pilot turndown test required by burner standards for
Intermittent and Interrupted pilots. It is ignored if Pilot Type is DBI.
If the Pilot type is Interrupted or Intermittent and this parameter is enabled, the burner control
sequence will hold (forever) at 1 second into the Ignition state.
During Pilot Test Hold, a flame-out timer always starts at zero when the Ignition state is
entered, then counts up toward 15 seconds while flame is off and down toward zero when
flame is on. This timer has a possible effect only during the pilot test: if it ever reaches 15
seconds of accumulated flame out time then a lockout occurs.
The pilot test hold should be enabled prior to entering Ignition, since changes to parameters
may require some seconds to take effect. Similarly, when the hold is disabled the burner
control may remain in the hold condition for a short time.
Internal, External, Hot Surface Ignitor
The Falcon can use either an internal spark generator, an external ignition source driven via
relay contacts that are interlocked with the main valve and powered through the ILK input
terminal or Hot Surface Ignitor using connector J5 (terminal 6 and 7).
MM:SS
During run stabilization the modulation rate is held at the light-off rate and is released for
modulation only after the hold time given by this parameter has expired. If this parameter is
zero then there is no stabilization time.
Comment
60