Sequence Of Operations - Slant/Fin CB-45 Installation And Operating Instructions Manual

SEQUENCE OF OPERATION
THERMOSTAT CALLS FOR HEAT
CIRCULATOR ON
HIGH
NO
LIMIT
CLOSED?
YES
AIR
PRESSURE
SWITCH
OPEN?
YES
BLOWER ON
AIR
NO
PRESSURE
SWITCH
CLOSED?
YES
BLOWER PREPURGE 10 SEC.
HOT SURFACE IGNITOR ON
IGNITOR WARM UP 10 SEC.
IGNITOR
NO
CURRENT
CHECK
OK?
YES
GAS VALVE OPEN 4 SEC.
IGNITOR OFF
NO
FLAME
DETECTED?
YES
GAS VALVE REMAINS OPEN
CIRCULATOR AND BLOWER
CONTINUE TO RUN
22
CIRCULATOR
CONTINUES TO RUN
NO
CIRCULATOR
CONTINUES TO RUN.
CIRCULATOR & BLOWER
CONTINUE TO RUN
CIRCULATOR
CONTINUES TO RUN.
BLOWER OFF
DISPLAY FAULT AND
CLOSE FAULT
CONTACTOR.
GAS VALVE CLOSES
CIRCULATOR & BLOWER
CONTINUE TO RUN
THERMOSTAT SATISFIED. GAS VALVE
CLOSED. CIRCULATOR OFF. BLOWER
POST PURGE 5 SEC. BLOWER OFF
DISPLAY LED
INDICATION
DISPLAY FAULT
AND CLOSE FAULT
NO
CONTACTS
HIGH
YES
LIMIT
OPEN OVER
1 HOUR?
DISPLAY FAULT AND CLOSE
FAULT CONTACTOR. WAIT FOR
PRESSURE SWITCH TO OPEN.
NO
COMPLETE 3
YES
TRIALS
TO CHECK
PRESSURE?
WAIT 1 HR.
CLEAR FAULT.
RE-TRY
OPERATION.
NO
COMPLETE
YES
3 TRIALS
TO DETECT
FLAME?
CIRCULATOR
CONTINUES TO RUN.
WAIT 1 HR.
BLOWER OFF
CLEAR FAULT.
DISPLAY FAULT AND
CLOSE FAULT
OPERATION.
CONTACTOR.
CIRCULATOR
CONTINUES TO RUN.
WAIT 1 HR.
BLOWER OFF
CLEAR FAULT.
DISPLAY FAULT AND
CLOSE FAULT
OPERATION.
CONTACTOR.
RE-TRY
RE-TRY