Amana *M(H Furnace User Manual


 
24
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ROCEDURE
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DJUSTMENT
Integrated ignition control monitors safety circuits
continuously.
Furnace awaits call from thermostat.
HEATING M ODE
(MODE DIP SWITCH IS SET TO “1 STG” POSITION)
The normal operational sequence in heating mode is as fol-
lows:
R and W thermostat contacts close, initiating a call for
heat.
Integrated control module performs safety circuit checks.
Induced draft blower is energized for 15 second pre-purge
period causing pressure switch contacts to close.
Igniter warm up begins after 15 second prepurge expires.
Low and high-stage gas valves open 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 detected.
Circulator blower is energized on high heat speed following
a fixed thirty second blower on delay. Electronic air
cleaner terminals are energized with circulator blower.
Furnace operates; 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.
The circulator blower remains on high speed for the
selected heat off delay period.
Furnace awaits the next call from thermostat.
(MODE DIP SWITCH IS SET TO “2 STG” POSITION)
The normal operational sequence in sequence 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 for 15 second prepurge
period causing pressure switch contacts to close.
Igniter warm up begins after 15 second prepurge expires.
Low and high-stage gas valves open at end of igniter
warm up period, delivering gas to burners and establishing
flame.
High-stage gas valve closes after five seconds; low-stage
gas valve remains open.
Integrated control module monitors flame presence. Gas
valve will remain open only if flame is detected.
Circulator blower is energized on low heat speed following
a fixed thirty second blower on delay. Electronic air
cleaner terminals are energized with circulator blower.
Furnace is now operating in low-stage heating mode.
Furnace operates; integrated control module monitors
safety circuits continuously.
If low-stage delay period expires, control will shift
operation from low-stage heating mode operation to high-
stage heating mode operation. Control will energize
circulator blower high heat speed and high stage gas
valve.
Furnace is now operating in high-stage heating mode.
R and W thermostat contacts open, completing the call
for heat.
Induced draft blower is de-energized following a fifteen
second post purge.
Circulator blower is de-energized following a heat off delay
period (selectable 100 or 150 seconds; factory set at
150 seconds).
If the furnace is operating in the low-stage heating mode
when thermostat contacts open, circulator remains at
low heat speed for the selected delay off period.
If the furnace is operating in high-stage heating mode
when the thermostat contacts open, the circulator blower
remains at high heat speed for the selected heat off delay
period.
Furnace awaits the next call from thermostat.
COOLING M ODE
The normal operational sequence in cooling mode is as fol-
lows:
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
continuously.
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 the next call from thermostat.