Installation & Operating Guide

SEQUENCE OF OPERATION FOR SENTINEL BOILERS
EQUIPPED WITH CONTINUOUS BURNING PILOTS
FOR DIAGRAM SHOWN ON PAGE 13.
1
2
Sentinel
LIGHTED PILOT HEATS THERMOCOUPLE AND KEEPS PILOTSTAT OPEN.
THERMOSTAT CALLS FOR HEAT
HIGH LIMIT CONTACTS CLOSED?
LOW WATER CUT-OFF (WHEN USED)
CONTACTS CLOSED?
VENT DAMPER RELAY ENERGIZED.
VENT DAMPER MOTOR OPENS VENT DAMPER.
END SWITCH CLOSES.
MAIN VALVE OPERATOR OPENS.
LIGHTED PILOT IGNITES MAIN BURNERS.
IF PILO
T 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.
CIRCULATOR ENERGIZED
(IF COMBINATION AQUASTAT
CONTROL USED)
NO FURTHER
A
CTION
SEQUENCE OF OPERATION FOR SENTINEL BOILERS EQUIPPED WITH HONEYWELL INTERMITTENT
IGNITION SYSTEM (IID) FOR DIAGRAM SHOWN ON PAGE 13.
THERMOSTAT CALLS FOR HEAT
HIGH LIMIT CONT
ACTS CLOSED?
LO
W
WATER CUT-OFF (WHEN USED)
CONTACTS CLOSED?
VENT D
AMPER 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 OPERA-
TORS 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 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.
NA
TURAL GAS (S8600F) IGNI-
TION SPARK CONTINUES.
PILO
T VALVE REMAINS OPEN
UNTIL SYSTEM IS RESET
.
CIRCULA
TOR ENERGIZED
(IF COMBINA
TION A
QUASTAT
CONTROL USED)
NO FURTHER
ACTION
NO
YES
YES
NO
YES
NONO
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