CB FALCON
750-265 64
BURNER CONTROL
OPERATION
Safety Shutdown of Burner Control
Functions
Safety Shutdown (Lockout) occurs if any of the following occur
during the indicated period:
1. INITIATE Period:
a. A/C line power errors occurred.
b. Four minute INITIATE period has been exceeded.
2. STANDBY Period:
a. Flame signal is present after 240 seconds.
b. Preignition Interlock is open an accumulative time of
30 seconds.
c. Interlock Start check feature is enabled and the Inter-
lock String (including Airflow Switch) is closed for 120
seconds with the controller closed. (jumpered or
welded Interlock).
d. Pilot Valve Terminal is energized.
e. Main Valve Terminal is energized.
f. Internal system fault occurred.
3. PREPURGE Period:
a. Preignition Interlock opens anytime during PRE-
PURGE period.
b. Flame signal is detected for 10 seconds accumu-
lated time during PREPURGE.
c. Purge Rate Fan RPM or High Fire Switch fails to
close within four minutes and fifteen seconds after
the firing rate motor is commanded to drive to the
high fire position at the start of PREPURGE.
d. Light off Rate Fan RPM or Low Fire Switch fails to
close within four minutes and fifteen seconds after
the firing rate motor is commanded to drive to the low
fire position at the end of PREPURGE.
e. Lockout Interlock (if programmed) does not close
within 10 seconds.
f. Lockout Interlock opens during PREPURGE.
g. Pilot Valve terminal is energized.
h. Main Valve terminal is energized.
i. Internal system fault occurred.
4. PRE-IGNITION TIME
a. Lockout Interlock opens.
b. IAS Purge and Ignition enabled and the Interlock
opens.
c. Preignition Interlock opens.
d. Pilot Valve terminal is energized.
e. Main Valve terminal is energized.
5. PILOT FLAME ESTABLISHING PERIOD (PFEP)
a. Low Fire Switch opens (if enabled).
b. Lockout Interlock opens (if enabled).
c. Pilot Valve terminal is not energized.
d. No flame is present at the end of the PFEP, or after
programmed number of retry attempts.
e. Main valve terminal is energized.
f. Internal system fault occurred.
6. MAIN FLAME ESTABLISHING PERIOD (MFEP).
a. Low Fire Switch opens (if enabled).
b. Lockout Interlock opens (if enabled).
c. Pilot valve terminal is not energized.
d. Main valve terminal is not energized.
e. No flame present at the end of MFEP.
f. Internal system fault occurred.
7. RUN Period:
a. No flame is present, or flame is lost (if enabled-lock-
out).
b. Lockout Interlock opens) if enabled).
c. IAS Purge and Ignition enabled and the Interlock
opens.
d. Pilot terminal energized (if programmed as Inter-
rupted Pilot).
e. Main valve terminal is not energized.
f. Internal system fault occurred.
8. POSTPURGE Period.
a. Preignition Interlock does not close in five seconds.
b. Pilot Valve terminal is energized.
c. Main Valve terminal is energized.
d. Internal system fault occurred.
e. Flame sensed 240 seconds accumulated time after
the RUN period.
Safety Shutdown
1. If the lockout interlocks open or a sensor designated as a
safety limit are read as defective, Falcon will lockout and
the blower motor will be de-energized.
If these open during the firing period, all fuel valves will
be de-energized, the system will complete postpurge,
and will lockout indicated by an alarm.
2. If the pilot flame is not detected by the end of the last (X
number recycle attempt), pilot trial for ignition period, the
pilot valve, and ignition transformer will be de-energized,
the system will complete post purge and will lockout indi-
cated by an alarm.
3. If the main flame is not detected at the end of the last
recycle attempt of the main flame establishing period, all
fuel valves will be de-energized, the device will complete
postpurge, and will lockout indicated by an alarm.
4. If the flame sensing signal is lost during the run period (if
lockout is selected), all fuel valves will be de-energized
within 4 seconds after the loss of the flame signal, the
device will complete postpurge, and will lockout indicate
by an alarm.
5. Manual reset is required following any safety shutdown.
Manual reset may be accomplished by pressing the push
button on the device, pressing the remote reset wired
into connector J10, or through an attached display.
Interrupting power to Falcon will cause electrical resets,
but does not reset a lockout condition.
Operational Sequence
Initiate
The Falcon enters the Initiate sequence on Initial Power up or:
• Voltage fluctuations vary less than 20Vac or greater than
30Vac.
• Frequency fluctuations vary +/-5% (57 to 63 Hz).
• If Demand, LCI, or Stat interrupt (open) during the Prepurge
Period.
• After the reset button is pressed or fault is cleared at the
displays.
The Initiate sequence also delays the burner motor from being
energized and de-energized from an intermittent AC line input
or control input.
If an AC problem exists for more than 240 seconds a lockout
will occur.
To Next Page
Loading...
Need help?
General
