I
I
q
YES
HEATING SEQUENCE OF OPERATION
CONTINUED
FLAME SIGNAL ABOVE
( > 1.40 microamps)
I SINGLE-STAGE THERMOSTAT MODE
I
'L (DiP SWITCH SET AT 'SINGLE") I'
YES _
START SECOND-STAGE RECOGNITION
ON DELAY (10 OR 15 MINUTES).
STATUS LED -- HEARTBEAT
ROLLOUT SWITCHES CLOSED?
YES
I FIRST-STAGE (LOW FIRE)PRESSURE SWITCH CLOSED?
YES _l _ NO
FIRST-STAGE HEAT DEMAND SATISFIED?
YES _
GAS VALVE OFF, COMBUSTION AIR INDUCER
OFF FOLLOWING POST PURGE.
INDOOR BLOWER OFF WITH DELAY
STATUS LED -- PULSE
SECOND-STAGE 30-SECOND DELAY ON BEGINSJ
STATUS LED -- HEARTBEAT.
YES _
SECOND-STAGE COMBUSTION AIR INDUCER
ON. SECOND-STAGE GAS VALVE ON. HIGH
HEAT INDOOR BLOWER SPEED ON.
STATUS LED -- HEARTBEAT.
q SECOND-STAGE HEAT DEMAND.
SECOND-STAGE HEAT DEMAND REQUIRED?
YES _
t SECOND STAGE PRESSURE SWITCH CLOSED?
ABNORMAL FLASH CODE.
NOTE - IF SECOND-STAGE PRESSURE SWITCH
WAS ORIGINALLY FOUND CLOSED,
ABNORMAL CODE WILL FLASH.
NO _I YES _
YES
SECOND-STAGE PRESSURE SWITCH CLOSED
IN LESS THAN TEN (10) SECONDS?
STATUS LED -- HEARTBEAT
YES _
CONTINUED ON NEXT PAGE
THERMOSTAT CALLS FOR HEAT.
STATUS LED -- HEARTBEAT
SEE BOX A.
LOW FLAME SIGNAL
(Does not affect control operation)
STATUS ERROR CODE 1 + 2.
,
I
I TWO STAGE THERMOSTAT MODE I_
I. (DIP SWITCH SET AT "TWO") j
YES _
I 45-SECOND INDOOR BLOWER ON DELAY BEGINS.
STATUS LED -- HEARTBEAT.
YES _
_, PRIMARY & SECONDARY LIMIT SWITCHES
CLOSED?
GAS VALVE OFF. COMBUSTION AIR INDUCER ON.
INDOOR BLOWER ON.
STATUS ERROR CODE 5 + 1. SEQUENCE HOLDS
UNTIL ROLLOUT SWITCH IS RESET AND MAIN
POWER IS INTERRUPTED OR THERMOSTAT
IS CYCLED OFF/ON FOR 3 SECOND MINIMUM.
k-
F
I GAS VALVE OFF, COMBUSTION AIR INDUCER OFF,
INDOOR BLOWER ON.
STATUS ERROR CODE 3 + 1.
I HAS PRIMARY OR SECONDARY LIMIT
SWITCH CLOSED WITHIN 3 MINUTES?
(Indoor blower on low speed during 3-minute period
NO1,
I LIMIT SWITCH WATCHGUARD MODE. I
GAS VALVE OFF, COMBUSTION AIR INDUCER OFF,
INDOOR BLOWER OFF WITH DELAY LY..ES_
STATUS ERROR CODE 4 + 5
IS 60-MINUTE RESET PERIOD COMPLETE? |
GAS VALVE OFF. COMBUSTION AIR INDUCER ON.
INDOOR BLOWER OFF AFTER DELAY.
STATUS ERROR CODE 2 + 3. CONTROL RESTARTS
IGNITION SEQUENCE IF PRESSURE SWITCH
CLOSES WITHIN 2-1/2 MINUTES.
SECOND-STAGE PRESSURE SWITCH CLOSED
AT BEGINNING OF HEAT DEMAND?
STATUS ERROR CODE 2 + 6.
YES
._.o
I
SECOND STAGE HEAT DEMAND
STATUS LED -- HEARTBEAT.
No f
RETURNS TO FIRST-STAGE HEAT MODE WHICH
CONTINUES UNTIL SECOND-STAGE PRESSURE
SWITCH CAN BE PROVEN or HEAT DEMAND IS
SATISFIED. FIVE (5) MINUTE WAIT PERIOD
INITIATED BEFORE RETRY. WERE 5 ATTEMPTS
MADE FOR SECOND-STAGE HEAT?
YES _
CONTINUES FIRST-STAGE HEATING DEMAND.
WILL NOT REATTEMPT SECOND-STAGE
HEATING DEMAND,
STATUS ERROR CODE 2 + 5.
I
l
Page 46
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