7 - detailed sequence of operation – Dunkirk Q95M-200 Modulating Condensing Boiler User Manual

Page 12

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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

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