GALAXY
17
SEQUENCE OF OPERATION FOR GALAXY BOILERS EQUIPPED WITH CONTINUOUS BURNING PILOT
FOR DIAGRAMS SHOWN ON PAGE 18-21.
SEQUENCE OF OPERATION FOR GALAXY BOILERS EQUIPPED WITH HONEYWELL INTERMITTENT PILOT IGNITION
SYSTEM (IID) FOR DIAGRAMS SHOWN ON PAGES 22-24.
LIGHTED PILOT HEATS THERMOCOUPLE AND KEEPS PILOTSTAT OPEN.
HIGH-LIMIT CONTACTS CLOSED?
LOW WATER CUT-OFF (WHEN USED) CONTACTS CLOSED?
PRESSURE CUT-OUT (WHEN USED) CONTACTS CLOSED?
VENT DAMPER RELAY ENERGIZED.
VENT DAMPER MOTOR MOVES OPEN (VENT DAMPER OPENS).
END SWITCH CLOSES.
MAIN VALVE OPERATOR OPENS.
LIT PILOT IGNITES MAIN BURNERS.
IF PILOT SHOULD BLOW OUT, THERMOCOUPLE WILL SHUT OFF MAIN BURNERS.
WHEN THERMOSTAT IS SATISFIED OR WHEN HIGH LIMIT, LOW LIMIT, PRESSURE CUT-OUT, OR
LOW WATER CUT-OFF CONTACTS ARE OPEN, MAIN VALVE OPERATOR CLOSES. VENT DAMPER
CLOSES. CIRCULATOR OFF. SYSTEM GOES TO STANDBY WITH LIT PILOT.
THERMOSTAT CALLS
FOR HEAT
HOT WATER BOILERS EQUIPPED
WITH COMBINATION AQUASTATS:
CIRCULATOR ENERGIZES
UNLESS LOW LIMIT (L8124 ONLY)
IS CALLING FOR HOT WATER
VENT DAMPER
(MODELS UNDER
300,000 BTU/HR.)
LOW LIMIT (FOR TANKLESS COIL)
CALLS FOR HOT WATER
NO FURTHER
ACTION
OR
NO
YES
HIGH-LIMIT CONTACTS CLOSED?
LOW WATER CUT-OFF (WHEN USED) CONTACTS CLOSED?
PRESSURE CUT-OUT (WHEN USED) CONTACTS CLOSED?
VENT DAMPER RELAY ENERGIZED.
VENT DAMPER MOTOR MOVES OPEN VENT DAMPER.
END SWITCH CLOSES.
IGNITION CONTROL ENERGIZED
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 CONTIN-
UES FOR 90 SECONDS.
AFTER TRIAL FOR IGNI-
TION, SYSTEM SHUTS OFF.
AFTER 5 MINUTES MOD-
ULE 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)
IGNITION SPARK CON-
TINUES. PILOT VALVE
REMAINS OPEN UNTIL
SYSTEM IS RESET.
SPARK GENERATOR OFF. MAIN VALVE OPERATOR OPENS. MODULE MONITORS PILOT FLAME.
THERMOSTAT CALLS
FOR HEAT
HOT WATER BOILERS EQUIPPED
WITH COMBINATION AQUASTATS:
CIRCULATOR ENERGIZES
UNLESS LOW LIMIT (L8124 ONLY)
IS CALLING FOR HOT WATER
MODELS WITH
VENT DAMPERS
LOW LIMIT (FOR TANKLESS COIL)
CALLS FOR HOT WATER
THE PILOT FLAME ESTABLISHED?
WHEN THERMOSTAT IS SATISFIED OR WHEN HIGH LIMIT, LOW LIMIT, PRESSURE CUT-OUT, OR LOW WATER CUT-OFF CON-
TACTS ARE OPEN, VALVE OPERATORS CLOSE, VENT DAMPER CLOSES. CIRCULATOR OFF. SYSTEM GOES TO STANDBY.
NO FURTHER
ACTION
OR
NO
NO
NO
YES
YES
