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HEATINGSEQUENCECONTINUED
NORMAL HEATING MODE
J PREPURGE J_15 SECONDS
l
IGNITION SEQUENCE BEGINS
(Ignition tfiatcounterinitiated.)
ABNORMAL HEATING MODE
j (s,GW'N_%_,%_0,0_',_",G%EF%%%,/
GAS VALVE OFF.COMBUSTION AIR
AND INDOOR BLOWER OFF. J-
ALTER_"%__NL%t_F_SRES/
MAIN GAS VALVE OPEN
LOWHEATONLY
(Ignitorremainsenergized,)
I
I
I
IGNITOR WARM-UP(20 SECONDS)
J-lr "_- -IF
TWO-STAGEMODE | I WETIMEDMODE I I
CALLFORIst STAGEHEATj L SINGLESTAGET'STAT j L
MAIN GAS VALVE OPEN
LOWHEATONLY
(IgNitor remains energized,|
SECONDSTAGE
TIMEONBEGINS /
4 SECONDS_
FLAME RECTIFICATION CURRENT CHECK J
I > 0.15 microamps) I
E MEPRESENT?V'--'I
(Responsetime -- 2 seconds maximum.)
INDOOR BLOWER ON DELAY BEGINS I
(45 seconds.)
I
WATCHGUARD - FLAME FAILURE.
_TAS VALVE OFF.
i COMBUSTION AIR INDUCER OFF.
INDOOR BLOWER OFF,
_. LED #1 & LED #2 ALTERNATE FLASH,
SINGLE-STAGE MODE J YES
HIGH HEAT ONLY j
CONTROL CHECKS RETRY
GAS VALVE OPEN FOR IGNmON COUNT
HIGH AND LOW HEAT
(ignitor remains energized,) HAVE FOUR E-TRIES
BEEN COMPLETED?
/
GAS VALVE JDE-ENERGIZED
........ 3__ .__ _ _.
TWO-STAGEMODE I I
CALLFOR IstSTAGEHEATJ L W'2TIMEDMOOE SINGLE-STAGEMODE I
SINGLESTAGET'STAT HIGHHEATONLY j
JL ....
-_-
INDOOR BLOWER ON LOW SPEED, INDOOR BLOWER ON HIGH HEATING I
ACC. TERM NAL ENERG ZES SPEED, ACC, TERM NAL ENERGIZES. I
I
I
1
I
I
I
GAS VALVE DE-ENERGIZED.
COMBUSTION AIR INDUCER DE-ENERGIZED.
INDOOR BLOWER ON.
LED #1 - SLOW FLASH; LED #2 - ON.
t
J HAS LIMIT CLOSED WITHINTHREE MINUTES?
I GAS VALVE DE-ENERGIZED. I
COMBUSTION AIR INDUCER DE*ENERGIZED.
INDOOR BLOWER OFF DELAY (Selected time)
LED #1 - ON
LED #2 - SLOW FLASH
FLAME PRESENT? I NO
!Continuous flame check)
I
_ LOWFLAMEB,GNAL
FLAME SIGNAL LED #1 - SLOW FLASH
( > 0.7 microamps) LED #2 - FAST FLASH
PRIMARY LIMIT SWITCH CLOSED?
ROLLOUT SWITCH CLOSED?
PRESSURE SWITCH CLOSED?
ICONTtNUED ON NEXT PAGE)
CONTINUED ON NEXT PAGE
Page 29