Cleaver-Brooks CBW - D. Burner Stays in Low Fire; E. Shutdown Occurs During Firing

CHAPTER6 ·
(b) Supply pump inoperative.
(c) No fuel.
(d) Main oil valve inoperative.
(e) Check oil nozzle,
gun and lines.
( 4) Insufficient
or no voltage at main fuel
valve circuit terminal.
(5) Flame detector defective, sight tube
obstructed
or lens dirty.
D. BURNER STAYS IN LOW
FIRE
(1) Pressure or temperature above
modulating control setting.
(2) Manual-automatic switch
in wrong
position.
(3) Inoperative modulating motor (see
Section F).
(4) Defective modulating control.
(5) Binding
or loose linkage, cams,
setscrews, etc.
CHAPTER 6-4
TROUBLE SHOOTING
E. SHUTDOWN OCCURS
DURING FIRING
(1) Loss or stoppage of fuel supply.
(2) Defective fuel valve; loose electrical
connection.
(3) Flame detector weak
or defective.
(4)
Lens dirty or sight tube obstructed.
(5)
If the programmer lockout switch has
not tripped, check the limit circuit for an
opened safety control.
(6) If the programmer lockout switch has
tripped:
(a) Check fuel lines and valves.
(b) Check flame detector.
(c) .Check for open circuit in running
interlock circuit.
(d) The flame failure light
is energized by
ignition failure, main flame failure, in-
adequate flame signal, or open control in
the running interlock circuit.
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