Slant/Fin GXH-190 - Manual (Page 20)

20 GALAXY
SEQUENCE OF OPERATION FOR GALAXY BOILERS
HIGH-LIMIT 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
CIRCULATOR IS OFF UNTIL
BOILER WATER TEMPERATURE
REACHES 120˚F
LOW LIMIT (FOR BOILERS WITH
TANKLESS COIL) CALLS
FOR HOT WATER
THE PILOT FLAME ESTABLISHED?
WHEN THERMOSTAT IS SATISFIED OR WHEN HIGH LIMIT, LOW LIMIT, OR LOW WATER CUT-OFF CONTACTS ARE OPEN,
VALVE OPERATORS CLOSE, VENT DAMPER CLOSES. CIRCULATOR OFF. SYSTEM GOES TO STANDBY.
NO FURTHER
ACTION
OR
NO
NO NO
YES
YES