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Amana GDH8 Installation Instructions Manual: Circulation Air Filters; Power Up; Heating Mode; Ntegrated Ignition Control )

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C
A
F
IRCULATION
IR
ILTERS
One of the most common causes of a problem in a forced air
heating system is a blocked or dirty filter. Circulating air filters
must be inspected monthly for dirt accumulation and replaced
if necessary. Failure to maintain clean filters can cause prema-
ture heat exchanger failure.
A new home may require more frequent replacement until all
construction dust and dirt is removed. Circulating air filters are
to be installed in the return air duct external to the furnace
cabinet.
MINIMUM FILTER SIZES for DISPOSABLE FILTERS
FURNACE INPUT
40M
60M
80M
100M
120M
140M
DISPOSABLE NOMINAL 300 F.M. FACE VELOCITY
H
I
ORIZONTAL
NSTALLATIONS
Filters must be installed in either the central return register or
in the return air duct work.
S
O
EQUENCE OF
PERATION
Refer to Timing Charts for sequencing.
NOTE: Dip switch positions referenced in this section applies
to (GME8, AMEH8, GDH8, ADSH8 & (A/G)MH8 MODELS
ONLY).
P
U
OWER
P
115 VAC power applied to furnace.
Integrated ignition control performs internal checks.
Integrated ignition LED will light.
Integrated ignition control monitors safety circuits
continuously.
Furnace awaits call from thermostat.
H
M
EATING
ODE
(M
DIP
ODE

SWITCH IS SET TO

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.
FILTER SIZE
2
320 in
2
483 in
2
640 in
2
800 in
2
738 in
2
738 in
(I
I
C
NTEGRATED
GNITION
"1 STG"
POSITION
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.
(M
DIP S
ODE
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.
)
ONTROL
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.
24
"2 STG"
WITCH IS SET TO
)
POSITION

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