PRODUCT DESIGN
77
NORMAL SEQUENCE OF OPERATION
Amana® Bramd Single-Stage
80% or 90% Furnaces
White-Rodgers 50A65 Integrated Ignition Control
POWER UP
1. 115 VAC power applied to furnace.
2. Integrated ignition control performs internal checks.
3. Integrated ignition control module LED will light.
4. Integrated ignition control monitors safety circuits
continuously.
5. Furnace awaits call from thermostat.
NORMAL HEATING SEQUENCE
1. Thermostat calls for heat .
2. The induced draft blower is energized for pre-purge pe-
riod.
3. The igniter is energized following pre-purge and is al-
lowed to preheat.
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 (4) seconds after the gas valve is ener-
gized. Gas will only continue to flow if a signal is present.
6. Circulator blower is energized on heat speed following a
fixed thirty second blower on delay. Electronic air
cleaner terminals are energized with circulator blower.
7. Furnace runs, integrated control module monitors safety
circuits continuously.
9. R and W thermostat contacts open, allowing the gas
valve to cycle off.
10. Induced draft blower is de-energized following a fifteen
(15) -second post purge. Humidifier terminals are de-
energized.
11. Circulator blower is de-energized following a selectable
heat off delay period (90, 120, 150 or 180 seconds).
Electronic air cleaner terminals are de-energized.
The adjustable delay-off timing allows the installer to cus-
tomize the comfort level.
COOLING MODE
The normal operational sequence in cooling mode is as fol-
lows:
1. R and Y thermostat contacts close, initiating a call for
cool.
2. Integrated control module performs safety circuit checks.
3. Outdoor fan and compressor are energized.
4. Circulator blower is energized on cool speed following
a fixed five second on delay. Electronic air cleaner ter-
minals are energized with circulator blower.
5. Furnace circulator blower and outdoor cooling unit run,
integrated control module monitors safety circuits con-
tinuously.
6. R and Y thermostat contacts open, completing the call
for cool.
7. Outdoor fan and compressor are de-energized.
8. Circulator blower is de-energized following a fixed forty
five second cool off delay period. Electronic air cleaner
terminals are de-energized.
9. Furnace awaits next call from thermostat.
FAN ONLY MODE
The normal operational sequence in fan only mode is as
follows:
1. R and G thermostat contacts close, initiating a call for
fan.
2. Integrated control module performs safety circuit checks.
3. Circulator blower is energized on heat speed. Elec-
tronic air cleaner terminals are energized.
4. Circulator blower runs, integrated control module moni-
tors safety circuits continuously.
5. R and G thermostat contacts open, completing the call
for fan.
6. Circulator blower is de-energized. Electronic air cleaner
terminals are de-energized.
7. Furnace awaits next call from thermostat.
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