Sequence Of Operation (Integrated Ignition Control) - Amana GUI Installation Instructions Manual

IX. Sequence of Operation
(Integrated Ignition Control)
Normal Heating Sequence
1. Thermostat calls for heat.
2. The induced draft blower is energized.
3. The ignitor is energized and is allowed to preheat for
17 seconds.
4. The gas valve is energized delivering gas to the
burners and starting combustion.
5. The control checks for a signal from the flame sensor
within seven seconds after the gas valve is ener-
gized. Gas will only continue to flow if a signal is
present.
6. The control waits 30 seconds and turns on the air
circulation blower to the speed that was selected for
heating operation.
7. The thermostat is satisfied and opens.
8. The control de-energizes the gas valve.
9. After a five or 15 second delay while flue products are
purged from the furnace heat exchanger, the in-
duced draft blower motor is de-energized.
10. The air circulation blower has an adjustable delay-off
timing of 60, 90, 120 or 180 seconds (starting from
the time the gas valve closes). This allows more heat
from the furnace to be transferred to the conditioned
space. After this time has elapsed, the blower will be
de-energized.
Abnormal Operation - Integrated Ignition Control
If the furnace operation is questionable, look through the
observation window in the blower access door and make
a note of the number of flashes in sequence between
pauses.
1 . Internal Control Failure with Integrated Ignition
Control
If, during a self test cycle, the control determines an
internal fault, the control stops and the diagnostic
light will light continuously. The control should be
replaced.
2. System Lockout
If flame is not sensed during the first 7 seconds after
the gas valve was energized, the control turns off the
gas. There will then be a 60 second delay with the
induced draft blower energized to purge the heat
exchanger. The ignitor will then be energized and
preheated for 27 seconds. The gas valve will be
energized. If flame is not sensed in 7 seconds the gas
valve will be de-energized and another purge will
occur. The control will cycle the gas valve a total of
three tries before it determines it cannot establish
measurable combustion and enters a locked out
state. If flame is sensed but lost after 10 seconds, the
control will recycle this series four more times before
locking out. The diagnostic light will indicate this
condition with one short flash followed by a longer
off. The control can be reset and brought out of
lockout mode by turning the thermostat off and then
back on. The control will automatically reset after one
hour.
3. Pressure Switch Stuck Closed
If the control senses the pressure switch is closed
when the induced draft blower is off, it waits until the
fault is corrected. The light code for this problem is
two short flashes followed by a longer pause. The
probable cause is faulty pressure switch or wiring.
4. Pressure Switch Stuck Open
If, after the induced draft blower is energized, the
pressure switch does not close, the control will keep
the blower on and wait for the switch to close. The
diagnostic light code for this problem is three short
flashes followed by a pause. The probable cause is
either: disconnected hose to the pressure switch,
faulty pressure switch or wiring, or restricted air
intake or flue piping.
5. Open Limit Control (Primary or Auxiliary)
If either limit control opens, the induced draft blower
will run for 15 seconds then turn off and the air
circulation blower will be turned on until the limit
closes. The diagnostic light code for this is four
short flashes followed by a pause. The probable
cause is either: low conditioned air flow due to dirty
filter or resistance in duct work, faulty limit, faulty
blower, or blower speed set too low.
6. Open Rollout Control
If the rollout control opens, the induced draft blower
will run for 15 seconds then turn off and the air
circulation blower will be energized all the time. The
diagnostic light code for this is five short flashes
followed by a pause. Probable cause is insufficient
combustion air, restricted flue passage or restricted
heat exchanger.
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