Sequence Of Operation Flow Chart - AO Smith BTR120 Manuel D'instructions

Description of this flow chart can be found in the "SEQUENCE OF OPERATION" section found on page 25.
IDLE
(NOT POWERED)
"CALL FOR HEAT"
RECEIVED FROM
THERMOSTAT
POWER TO
MODULE AND
SELF CHECK
TRIAL FOR
IGNITION
SPARK ON
(TIMER STARTED)
FLAME
CLOSE PILOT
NO
PROVED?
GAS VALVE
(BEFORE TRIAL FOR IGNITION TIMER EXPIRES)
YES
SPARK OFF
OPEN MAIN GAS
VALVE
FLAME
STABILIZATION
(2 SECONDS)
FOR HEAT"
RUN
ENDS?
CLOSE MAIN GAS
VALVE AND PILOT
GAS VALVE

SEQUENCE OF OPERATION FLOW CHART

A
OPEN PILOT GAS
VALVE
SPARK OFF
NO
"CALL
FLAME
NO
LOST?
YES
FLOW CHART 1.
RETRY DELAY
(5 MINUTES)
RETRY
RETRY OR
LOCKOUT
MODEL?
CLOSE MAIN GAS
YES VALVE AND PILOT
GAS VALVE
26
WAIT FOR
"CALL FOR HEAT"
TO BE REMOVED
ACTIVATE ALARM
CONTACT(S)
(OPTIONAL)
LOCKOUT
A