Slant/Fin Galaxy GXH-300H Installation And Operating Instructions Manual page 19

GALAXY
EQUIPPED WITH WHITE RODGERS INTERMITTENT IGNITION SYSTEM
CIRCULATOR ENERGIZED WHEN
USED WITH COMBINATION AQUA-
STAT CONTROL ON HOT WATER
BOILERS ONLY
PILOT SOLENOID (IN GAS VALVE) ENERGIZED (OPENS). GAS FLOWS TO PILOT AND GAS CLOSES PRESSURE SWITCH.
5059 RELIGHT CONTROL SPARKS AT PILOT, LIGHTS PILOT AND STOPS SPARKING WHEN 5059 SENSES PILOT FLAME
FLAME SENSOR SWITCH CLOSES CIRCUIT TO MAIN VALVE AND MAIN BURNERS ARE IGNITED BY PILOT FLAME. PILOT STAYS LIT. SYSTEM IN FULL OPERATION
IF PILOT SHOULD BLOW OUT—FLAME SENSOR WILL SHUT-OFF MAIN BURNER, AND SPARK WILL START AT PILOT BURNER AGAIN.
WHEN EITHER HIGH LIMIT, PRESSURE CUT-OUT OR LOW WATER CUT-OFF ARE OPEN OR WHEN LOW LIMIT
IS SATISFIED AND THERMOSTAT IS NOT CALLING FOR HEAT, VALVE CLOSES, PILOT AND MAIN BURNERS GO OFF.
VENT DAMPER*
If included
SEQUENCE OF OPERATION FOR SLANT/FIN BOILERS
THERMOSTAT CALLS FOR
HEAT
VENT DAMPER MOTOR ENERGIZED
VENT DAMPER OPEN
SEND SWITCH CLOSES
HIGH LIMIT OR PRESSURE CUT-OUT CLOSED (NORMAL OPERATING POSITION)
LOW WATER CUT-OFF (WHEN USED) CLOSED (NORMAL OPERATING POSITION)
PILOT HEATS UP MERCURY FLAME SENSOR
RELAY DE-ENERGIZES
VENT DAMPER MOTOR ENERGIZED
END SWITCH OPENS, VENT DAMPER CLOSES
IF BOILER SHUTS DOWN ON HIGH LIMIT OR OTHER LINE VOLTAGE SAFETY
CONTROLS, THE DAMPER WILL REMAIN OPEN.
The ceramic combustion chamber in the burner
box contains crystalline silica.
Wear proper dust mask and gloves when servicing
combustion chamber of burners.
Crystalline silica has been identified as a
carcinogenic or possibly carcinogenic to humans.
LOW LIMIT (FOR TANKLESS COIL)
OR
CALLS FOR HOT WATER
RELAY ENERGIZES
WARNING:
VENT DAMPER
IF INCLUDED
*All models under 88,000 W (300,000 Btuh)
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