Detailed Sequence Of Operation - Dunkirk 95M-200 Control Manual And Troubleshooting Manual

7 - DETAILED SEQUENCE OF OPERATION

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