Table of Contents
Advertisement
I
:q
I
[
I
I
I
HEATING
SEQUENCE
OF OPERATION
NORMAL HEATING MODE
ABNORMAL HEATING MODE
I
POWER ON
]
CONTROL SELF-CHECK
OKAY?
YES 1
IS POLARITY CORRECT?
YES !
IS THERE A PROPER GROUND?
YES l
NO
IS VOLTAGE
ABOVE 90 VOLTS?
YES 1
ROLLOUT SWITCH CLOSED?
YESJ
BURNER OFF?
(CONTINUOUS
FLAME CHECK)
YES _
NORMAL OPERATION:
LED #1 -- SLOW FLASH
LED #2 -- SLOW FLASH
YES _
THERMOSTAT
CALLS FOR HEAT:
LED #1 -- FAST FLASH
LED #2 -- FAST FLASH
YES _l
PRIMARY AND SECONDARY
LIMIT SWITCH.
CLOSED?
YES
IS COMBUSTION
AIR
PRESSURE
SWITCH OPEN?
YES
_
IS COMBUSTION
AIR INDUCER
ENERGIZED?
YES
_
HAS COMBUSTION
AIR PRESSURE
SWITCH CLOSED IN 2.5 MINUTES?
YES _
o
NO
NO
NO
.[
GAS VALVE OFR COMBUSTION
AIR INDUCER OFF.
INDOOR BLOWER DELAY OFF.
LED #1 ON
LED #2 ON
(RESET CONTROL
BY TURNING MAIN POWER OFF.)
POLARITY
REVERSED,
LED #1 -- FAST FLASH
LED #2 -- SLOW FLASH
IMPROPER
GROUND,
LED #1 -- ALTERNATING
FAST FLASH
LED #2 -- ALTERNATING
FAST FLASH
LEDs SIGNAL FAST ALTERNATING
FLASH.
CONTROL WILL NOT RESPOND TO A CALL FOR
HEATING UNTIL VOLTAGE RISES ABOVE 95 VOLTS.
GAS VALVE OFR COMBUSTION
AIR INDUCER ON.
INDOOR BLOWER ON.
LED #1 -- ON. LED #2 -- SLOW FLASH,
SEQUENCE
HOLDS UNTIL ROLLOUT SWITCH CLOSES
AND POWER IS RESET OR T'STAT IS INTERRUPTED
FOR MINIMUM OF 1 SECOND,
GAS VALVE OFR COMBUSTION
AIR INDUCER ON.
INDOOR BLOWER ON HEATING SPEED,
LED #1 -- SLOW FLASH
LED #2 -- OFF
Jl
NO
I=[
9
COMBUSTION
AIR INDUCER OFF.
INDOOR BLOWER ON
LED #1 SLOW FLASH RATE
LED #2 -- ON
GAS VALVE OFR
COMBUSTION
AIR INDUCER OFF.
INDOOR BLOWER OFF WITH DELAY,
LED #1 OFF
LED #2 SLOW FLASH
(Sequence holds until pressure switch
opens or thermostat resets control,)
PRESSURE SWITCH IS IN WATCHGUARD
MODE.
GAS VALVE OFR COMBUSTION
AIR INDUCER OFF.
INDOOR BLOWER OFF WITH DELAY,
LED #1 -- OFR LED #2 -- SLOW FLASH,
IS 5-MINUTE RESET PERIOD COMPLETE?
_
YES
CONTINUED
NEXT PAGE
Page 29
Advertisement
Table of Contents
