Kenmore K90-150 Owner's Manual page 27

I POWER ON I
STAND BY
I THERMOSTAT I
CALLS FOR HEAT
CIRCULATOR
ENERGIZES THRU
2K1 CONTACTS
/
IBC SELF CHECK OF /
J
INTERNAL CIRCUITRY
1-2 SEC
IF MAIN BURNER DOES NOT PROVE
FL&ME IN 3 TRIALS, CONTROL
LOCKOUT, VALVE/FLAME LIGHT BLINKS,
RESET IS REQUIRED THIS PROBLEM IS A
RESULT OF NOT ESTABLISHING A FLAME SIGNAL.
CONTROL WILL ATTEMPT 2
ADDITIONAL IGNITION SEQUENCES
STARTING WITH PREPURGE
DRAFT JNDUCER I
ENERGIZES THRU
1KICONTACTS
IBC
WAITS FOR
UP TO 5 MINUTES
FOR AIR PRESSURE
SWITCH CONTACTS TO CLOSE
INDICATING FAN
SUCTION
PRESENT
_r
I
CONTROL LOCKOUT PURGE LIGHT I
BLINKS. RESET REQUIRED. CIRCULATOR
I
REMAINS ENERGIZED AS LONG AS
THERMOSTAT CONTINUES TO GALL FOR
HEAT
PURGE LIGHT 18ON, AIRFLOW PROVED.
DRAFT INDUCER RUNS FOR 15 SEC. PREPURGE
MAIN BURNER
BURNER PROVE
FLAME WITHIN
INITIAL TRIAL
FOR IGNITION
PERIOD?
J DURING THE LAST 2 SEC OF THE 6 SEC. IGNITION
TRIAL, MAIN BURNER FLAME IS PROVED BY FLAME
RECTIFICATION. A FLAME SIGNAL TO IBC GAS VALVE
REMAINS ENERGIZED. BOILER RUNS,
2 SEC INTO THE 6 SEC IGNITION TRIAL POWER
IS TURNED OFF TO THE HOT SURFACE IGNITER,
IGNITER LIGHT IS OFF.
GAS VALVE OPENS FOR 6 BEG. TRIAL FOR
IGNITION BLUE ORANGE GLOW OF THE BURNER
CAN BE SEEN THRU OBSERVATION PORT,
GAB VALVE ENERGIZED THRU 3K1 AND 4K1
CONTACTS. VALVE LIGHT IS ON.
PURGE LIGHT GOES OUT. HOT SURFACE IGNITER
POWERED THRU 5K1 5K2 CONTACTS FOR 20
SEC, IGNITER WARMUP BRIGHT YELLOW
ORANGE GLOW OF THE HOT SURFACE IGNITER
CAN BE OBSERVED THRU THE OBSERVATION
PORT iN FRONT OF BOILER SECTION JUST
ABOVE IGNITER. IGNITER UGHT IS ON.
NORMAL ]
OPERATION