Dunkirk Q95M-200 Modulating Condensing Boiler - Manual (Page 12)

12
7 - DETAILED SEQUENCE OF OPERATION
POWER ON. UNIT IN STANDBY
THERMOSTAT CALLS FOR HEAT
INTERNAL MICRO CONTROLLER TEST
CIRCULATOR ENERGIZES
CONTROL CHECKS N O
AIR PRESSURE SWITCH
CONTACTS
COMBUSTION AIR
BLOWER ENERGIZES
CONTROL ENTERS
LOCKOUT ERROR CODE
DISPLAYED
CONTROL NEEDS
TO BE RESET FROM
LOCKOUT
CONTROL WAITS FOR
AIR PROVING SWITCHES
TO CLOSE INDICATING
SUFFICIENT FAN SUCTION
PRESENT
CONTROL ENTERS
LOCKOUT ERROR CODE
DISPLAYED
CONTROL NEEDS
TO BE RESET FROM
LOCKOUT
CONTROL ENTERS
PRE-PURGE
COMBUSTION AIR
BLOWER RUNS FOR 20
SECOND PRE-PURGE
SPARK IGNITER
ACTIVATES
GAS VALVE OPENS
UNIT LIGHTS AND
FLAME RECTIFICATION
UNIT TRIES FOR
IGNITION 5 TIMES
UNIT OPERATES
NORMALLY
FALSE POSITIVE PROOF
OF AIRFLOW
CONTROL ENTERS
LOCKOUT ERROR CODE
DISPLAYED
CONTROL NEEDS
TO BE RESET FROM
LOCKOUT
END CALL FOR HEAT
CONTROL ENTERS 30
SECOND POST PURGE
UNIT ENTERS
STANDBY, WAITING
FOR CALL FOR HEAT
CLOSED OPEN
CLOSED OPEN
YES NO
ATTEMPT TO LIGHT
DOES NOT LIGHT AFTER 6 TRIES