Normal Sequence Of Operation; Power Up; Heating Mode; Cooling Mode - Amana GUCA Installation Instructions Manual

XV. Normal Sequence
of Operation

POWER UP

The normal power up sequence is as follows:
•
115 VAC power applied to furnace.
•
Integrated control module performs internal checks.
•
Integrated control module flashes LED one time.
•
Integrated control module monitors safety circuits con-
tinuously.
•
Furnace awaits call from thermostat.

HEATING MODE

The normal operational sequence in heating mode is as
follows:
•
R and W thermostat contacts close, initiating a call for
heat.
•
Integrated control module performs safety circuit
checks.
•
Induced draft blower is energized causing pressure
switch contacts to close. Humidifier terminals are
energized with induced draft blower.
•
Igniter warm up begins upon close of pressure switch
contacts.
•
Gas valve opens at end of igniter warm up period,
delivering gas to burners and establishing flame.
•
Integrated control module monitors flame presence.
Gas valve will remain open only if flame is sensed.
•
Circulator blower is energized on heat speed following
a fixed thirty second blower on delay. Electronic air
cleaner terminals are energized with circulator blower.
•
Furnace runs, integrated control module monitors safety
circuits continuously.
•
R and W thermostat contacts open, completing the call
for heat.
•
Gas valve closes, extinguishing flame.
•
Induced draft blower is de-energized following a fifteen
second post purge. Humidifier terminals are de-ener-
gized.
•
Circulator blower is de-energized following 90 second
heat off delay period. Electronic air cleaner terminals
are de-energized.
•
Furnace awaits next call from thermostat.

COOLING MODE

The normal operational sequence in cooling mode is as
follows:
•
R and Y thermostat contacts close, initiating a call for
cool.
•
Integrated control module performs safety circuit
checks.
•
Outdoor fan and compressor are energized.
•
Circulator blower is energized on cool speed following
a fixed five second on delay. Electronic air cleaner
terminals are energized with circulator blower.
•
Furnace circulator blower and outdoor cooling unit run,
integrated control module monitors safety circuits con-
tinuously.
•
R and Y thermostat contacts open, completing the call
for cool.
•
Outdoor fan and compressor are de-energized.
•
Circulator blower is de-energized following a fixed forty
five second cool off delay period. Electronic air cleaner
terminals are de-energized.
•
Furnace awaits next call from thermostat.

FAN ONLY MODE

The normal operational sequence in fan only mode is as
follows:
•
R and G thermostat contacts close, initiating a call for
fan.
•
Integrated control module performs safety circuit
checks.
•
Circulator blower is energized on cool speed. Elec-
tronic air cleaner terminals are energized.
•
Circulator blower runs, integrated control module moni-
tors safety circuits continuously.
•
R and G thermostat contacts open, completing the call
for fan.
•
Circulator blower is de-energized. Electronic air cleaner
terminals are de-energized.
•
Furnace awaits next call from thermostat.
XVI. Operational Checks

BURNER FLAME

The burner flames should be inspected with the burner
compartment door installed. A sight glass is provided for
inspection purposes. Flames should be stable, quiet, soft,
and blue (dust may cause orange tips but they must not be
yellow). Flames should extend directly outward from the
burners without curling, floating, or lifting off. Flames must
not impinge on the sides of the heat exchanger firing tubes.
Burner Flame
38
Check the burner flames for:
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off.