16
Sentry
SEQUENCE OF OPERATION FOR SENTRY 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 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 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 CONTINUOUSLY.
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
Summary of Contents for S-34
Page 10: ...10 Sentry Figure 9 Single zone with indirect water heater DHW Priority using R882A B relay...
Page 18: ...18 Sentry Figure 11 Zoning with circulators optional indirect DHW tank...
Page 19: ...19 Sentry Figure 12 Zoning with zone valves optional indirect DHW tank...
Page 27: ...27 Sentry...
