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NORMAL HEATING MODE
15-SECOND COMBUSTION AIR INDUCER PREPURGE 9
N T ATED BY CLOSED PRESSURE SW TCH.
YES _
I IGNITOR WARM-UP -- 20 SECONDS.
YES
I 4-SECOND TRIAL FOR IGNITION.
GAS VALVE OPENS, IGNITOR ENERGIZED FOR
UP TO 4 SECONDS,
YES
I FLAME STABILIZATION PERIOD.
4 SECONDS
FLAME RECTIFICATION CURRENT
CHECK. CAN FLAME BE PROVEN WITHIN
4 SECONDS AFTER GAS VALVE OPENS?
( > 0.24 microamps)
YES _
ABNORMAL HEATING MODE
FLAME PRESENT?
YES _
I FLAME SIGNAL ABOVE 0.31 MICROAMPS?
YES _
I INDOOR BLOWER ON DELAY BEGINS
(45 seconds,)
YES _1
PRIMARY AND SECONDARY LIMITSWITCHES CLOSED?
YES
÷1
I
I
I ROLLOUT SWITCH CLOSED?
q
YES _
COMBUSTION AIR PRESSURE
SWITCH CLOSED?
YES _
THERMOSTAT DEMAND SATISFIED.
YES
LED #1 & #2 SIMULTANEOUS SLOW FLASHES.
YES _
COMB. AIR INDUCER CONTINUES 5-SECOND
POST PURGE AFTER T'STAT DEMAND IS SATISFIED,
INDOOR AIR BLOWER COMPLETES SELECTED "OFF"
DELAY BEFORE SHUTTING OFF.
-_O S VOLTAGE ABOVE 75 VOLTS?
YES_ . NO I
_IIW ISTHERE A PROPER GROUND? I--=-_l
YES_t INOI
ISIGNITOR INTACT AND CONNECTED?I_"I
LEDS SIGNAL
ALTERNATING
FAST FLASH
I GAS VALVE OFF. COMBUSTION AIR INDUCER ON.
INDOOR BLOWER OFF. I
HAS CONTROL FA LED TO SENSE FLAME FOR NO
FIVE CONSECUTIVE TRIES DURING A SINGLE
I HEAT DEMAND?
t
I_ IGNITION WATCHGUARD MODE. GAS VALVE OFF. I YES
COMBUSTION AIR INDUCER OFF. |
INDOOR BLOWER OFF WITH DELAY
LED 1 ALT. SLOW FLASH LED 2 ALT SLOW FLASH I I
IS 60-MINUTE RESET PERIOD COMPLETE? I,.__ I
_,Z_._I
HASCONTROLRESET,GN,T,ON
I I SEQUENCE FOUR TIMES? /
NO
- I
I
F-
LOW FLAME SIGNAL
(Does not affect operation of control)
LED #1 -- SLOW FLASH
LED #2 -- FAST FLASH
GAS VALVE DE-ENERGIZED
COMBUSTION AIR INDUCER
DE-ENERGIZED.INDOOR BLOWER
ON UNTIL SWITCH CLOSES.LED #1
-- SLOW FLASH, LED #2 -- ON.
IS LIMIT SWITCH CLOSED?
YES
HAS PRIMARY/SECONDARY LIMIT
RESET (CLOSED) WITHIN 3
MINUTES?
YESl
LIMIT SWITCH WATCH-
GUARD MODE. GAS
VALVE OFF. COMB. AIR
INDUCER OFF. INDOOR
BLOWER OFF WITH
DELAY, LED#I-SLOW
FLASH LED#2 - ON. IS
60MINUTE RESET
PERIOD COMPLETE?
YES
NO
I
I
GAS VALVE POWER OFR
COMBUSTION AIR INDUCER POWER OFF.
INDOOR BLOWER OFF WITH DELAY
LED #1 -- ON. LED #2 -- SLOW FLASH,
SEQUENCE HOLDS UNTIL ROLLOUT SWITCH IS RESET
I GAS VALVE DE-ENERGIZED
COMBUSTION AIR INDUCER ON.
INDOOR BLOWER OFF WITH DELAY
LED #1 -- OFF. LED #2 -- SLOW FLASH,
HAS CAB SWITCH CLOSED IN 2.5 MINUTES?
NO_
I 5-MINUTE PRESSURE SWITCH
WATCHGUARD MODE,
YES
YES
]
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