Slant/Fin LX-150 - Manual (Page 36)

Lynx 36
LYNX BOILER SEQUENCE OF OPERATION
THERMOSTAT CALLS FOR HEAT
CIRCULATOR(S) ON
5 SECOND PRE-PURGE PERIOD
GAS VALVE REMAINS OPEN. CONTROL
CONTINUOUSLY MONITORS
THERMOSTAT, HIGH LIMIT, WATER
SENSORS, BLOWER SPEED, FLAME
SIGNAL, AND LWCO (IF USED).
THERMOSTAT CALL FOR HEAT ENDS
GAS VALVE CLOSES
10 SECOND BLOWER 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
SPARK IGNITOR ENERGIZED
FOR 3.5 SECONDS
YES
GAS VALVE OPENS
FOR 2.5 SECONDS
SPARK CONTINUES FOR
2.5 SECONDS
SPARK IGNITOR DE-ENERGIZED
GAS VALVE REMAINS OPEN FOR
3.5 SECONDS
YES
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 WATER HIGH LIMIT
CLOSED?
BLOWER SPEED CONFIRMED?
3 TRIALS FOR
IGNITION WITH NO
FLAME SENSED?
FLAME SIGNAL SENSED?