Sequence Of Operations - Slant/Fin SENTRY SX-150 Installation And Operating Instructions Manual

Sentry
CIRCULATOR ENERGIZED
(IF COMBINATION AQUASTAT
CONTROL USED)
SEQUENCE OF OPERATION FOR SENTRY BOILERS EQUIPPED WITH HONEYWELL INTERMITTENT
IGNITION SYSTEM (IID) FOR DIAGRAMS SHOWN ON PAGE 15.
CIRCULATOR ENERGIZED
(IF COMBINATION AQUASTAT
CONTROL USED)
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 & S8670E)
IGNITION TRIAL CONTINUES FOR 90 SEC-
ONDS. AFTER TRIAL FOR IGNITION, SYS-
TEM SHUTS OFF. AFTER 5 MINUTES MOD-
ULE RE-INSTATES TRIAL FOR IGNITION. IF
PILOT FLAME NOT ESTABLISHED, IGNI-
TION TRIAL, SYSTEM SHUT-OFF AND 5
MINUTES WAIT SEQUENCE REPEATS
CONTINUOUSLY.
WHEN THERMOSTAT IS SATISFIED OR WHEN HIGH LIMIT OR LOW WATER CUT-OFF CONTACTS ARE OPEN, VALVE OPERA-
TORS CLOSE. PILOT & MAIN BURNERS OFF. VENT DAMPER CLOSES. CIRCULATOR OFF. SYSTEM GOES TO STANDBY.
SEQUENCE OF OPERATION FOR SENTRY BOILERS
EQUIPPED WITH CONTINUOUS BURNING PILOTS
FOR DIAGRAMS SHOWN ON PAGE 14.
LIGHTED PILOT HEATS THERMOCOUPLE AND KEEPS PILOTSTAT OPEN.
THERMOSTAT CALLS FOR HEAT
HIGH LIMIT CONTACTS CLOSED?
LOW WATER CUT-OFF (WHEN USED)
VENT DAMPER RELAY ENERGIZED.
VENT DAMPER MOTOR OPENS VENT DAMPER.
END SWITCH CLOSES.
MAIN VALVE OPERATOR OPENS.
LIGHTED PILOT IGNITES MAIN BURNERS.
IF PILOT SHOULD BLOW OUT, THERMOCOUPLE
WILL SHUT OFF MAIN BURNER.
WHEN THERMOSTAT IS SATISFIED, OR WHEN HIGH LIMIT
OR LOW WATER CUT-OFF CONTACTS ARE OPEN, MAIN
VALVE OPERATOR CLOSES.
VENT DAMPER CLOSES. CIRCULATOR OFF.
SYSTEM GOES TO STANDBY WITH LIGHTED PILOT.
THERMOSTAT CALLS FOR HEAT
HIGH LIMIT CONTACTS CLOSED?
LOW WATER CUT-OFF (WHEN USED)
VENT DAMPER RELAY ENERGIZED.
VENT DAMPER MOTOR OPENS VENT DAMPER.
IGNITION CONTROL ENERGIZED
SPARK GENERATOR MODULE POWERED.
NO
THE PILOT FLAME ESTABLISHED ?
SPARK GENERATOR OFF. MAIN VALVE
OPERATOR OPENS. MODULE MONITORS
CONTACTS CLOSED?
YES
CONTACTS CLOSED?
YES
END SWITCH CLOSES.
YES
PILOT FLAME.
NO
NO FURTHER
ACTION
NO
NO FURTHER
ACTION
NATURAL GAS (S8600F) IGNI-
NO
TION SPARK CONTINUES.
PILOT VALVE REMAINS OPEN
UNTIL SYSTEM IS RESET.
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