10
Sentinel
SEQUENCE OF OPERATION FOR SENTINEL BOILERS
THERMOSTAT CALLS FOR HEAT
HIGH LIMIT CONTACTS CLOSED?
LOW WATER CUT OFF
CONTACTS CLOSED?
VENT DAMPER RELAY ENERGIZED.
VENT DAMPER MOTOR OPENS VENT DAMPER.
END SWITCH CLOSES.
IGNITION CONTROL ENERGIZED
THE PILOT FLAME ESTABLISHED ?
SPARK GENERATOR OFF. MAIN VALVE
OPERATOR OPENS. MODULE MONITORS
PILOT FLAME.
WHEN THERMOSTAT IS SATISFIED OR WHEN HIGH LIMIT OR LOW WATER CUT OFF CONTACTS ARE OPEN, VALVE OPERATORS
CLOSE. PILOT and MAIN BURNERS OFF. VENT DAMPER CLOSES. CIRCULATOR OFF. SYSTEM GOES TO STANDBY.
SPARK GENERATOR MODULE POWERED.
S8600F OR S8600M: IGNITION SPARK STARTS AND PILOT VALVE OPERATOR OPENS.
S8670E: IGNITION SPARK AND PILOT VALVE OPERATOR DELAYED FOR 30 70 SECONDS.
L.P. PROPANE GAS (S8600M and
S8670E) IGNITION TRIAL CONTINUES
FOR 90 SECONDS. AFTER TRIAL FOR
IGNITION, SYSTEM SHUTS OFF. AFTER
5 MINUTES MODULE RE INSTATES
TRIAL FOR IGNITION. IF PILOT FLAME
NOT ESTABLISHED, IGNITION TRIAL,
SYSTEM SHUT OFF AND 5 MINUTES
WAIT SEQUENCE REPEATS CONTINU
OUSLY.
NATURAL GAS (S8600F) IGNI
TION SPARK CONTINUES. PILOT
VALVE REMAINS OPEN UNTIL
SYSTEM IS RESET.
CIRCULATOR ENERGIZED
NO FURTHER
ACTION
YES
NO
YES
NO
NO
