Slant/Fin GXHA-200 - Manual (Page 15)

GALAXY STEAM BOILER 15
SEQUENCE OF OPERATION FOR GALAXY STEAM BOILERS
LOW WATER CUT-OFF CONTACTS CLOSED?
PRESSURE CUT-OUT 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 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, IGNI-
TION TRIAL, SYS-
TEM SHUT-OFF AND
5 MINUTES WAIT
SEQUENCE
REPEATS
CONTINUOUSLY.
NATURAL GAS
(S8600F) IGNI-
TION SPARK
CONTINUES.
PILOT VALVE
REMAINS OPEN
UNTIL SYSTEM
IS RESET.
SPARK GENERATOR OFF. MAIN VALVE OPERATOR OPENS. MODULE MONITORS PILOT FLAME.
THERMOSTAT CALLS
FOR HEAT
MODELS WITH
VENT DAMPERS
LOW LIMIT (FOR TANKLESS COIL)
CALLS FOR HOT WATER
THE PILOT FLAME ESTABLISHED?
WHEN THERMOSTAT IS SATISFIED OR WHEN LOW LIMIT, PRESSURE CUT-OUT, OR LOW WATER CUT-OFF CONTACTS ARE
OPEN, VALVE OPERATORS CLOSE, VENT DAMPER CLOSES. SYSTEM GOES TO STANDBY.
NO FURTHER
ACTION
OR
NO
NO NO
YES
YES