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Bobcat Models B-120A and B-200A
36
THERMOSTAT CALLS FOR HEAT
CIRCULATOR(S) ON
5 SECOND PRE-PURGE
PERIOD
BOBCAT BOILER MODELS B-120 and B-200 SEQUENCE OF OPERATION
BLOWER SPEED CONFIRMED?
GAS VALVE OPENS
GAS VALVE REMAINS OPEN. CONTROL
CONTINUOUSLY MONITORS
THERMOST
A
T
, HIGH LIMIT, WATER
SENSORS, BLOWER SPEED, FLAME
SIGNAL, AND LWCO (IF USED).
THERMOST
A
T
CALL FOR HEAT ENDS
GAS
V
AL
VE
CLOSES
10 SECOND
BLO
WER
POST PURGE.
15 SECOND
CIRCULATOR POST PURGE.
CONTROL LOCKOUT
DISPLAY SHOWS
ERROR “A 33”
YES
NO
NO
COMBUSTION BLOWER ON
(AT MEDIUM SPEED)
TRIAL FOR IGNITION - 6 SECONDS
SPARK IGNITOR ENERGIZED
WATER HIGH LIMIT CLOSED?
YES
GAS VALVE REMAINS OPEN
FOR 4 SECONDS
SPARK IGNITOR DE-ENERGIZED
FLAME SIGNAL SENSED?
YES
3 TRIALS FOR
IGNITION
WITH NO FLAME SENSED?
2 TIMES RETRIALS
FOR IGNITION
GAS VALVE CLOSED.
BLOWER POST PURGE
10 SECONDS.
NO
CONTROL LOCKOUT
DISPLAY SHOWS
ERROR “A 01”
YES
CONTROL LOCKOUT
DISPLAY SHOWS
ERROR “A 03”
NO