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American Standard AUD2B060AFV32A Installer's Manual Page 25

Variable speed, 2-stage, 80% upflow/horizontal gas-fired furnaces, fan assisted combustion system with whole house air cleaner.
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Heating: The Integrated Furnace Control (IFC) con-
trols the Variable Speed Indoor Blower.
"on" time is fixed at 45 seconds after ignition.
FAN-OFF period is field selectable by dip switches #1
and #2 located on the Integrated Furnace Control be-
tween the 5-pin and 9-pin wire connectors. The delay
may be set at 60, 100, 140, or 180 seconds. The factory
setting is 100 seconds (See unit wiring diagram).
Cooling: The fan delay-off period is set by dip switches
on the Integrated Furnace Control.
cooling delay off is field selectable by dip switches #5
and #6.
The following table and graph explain the delay-off set-
tings:
TABLE 12
FAN OFF - DELAY OPTIONS
SWITCH SETTINGS
5 - OFF
6 - OFF
5 - ON
6 - OFF
5 - OFF
6 - ON
5 - ON
6 - ON
This unit is equipped with a blower door switch which
cuts power to the blower and Gas Valve causing shut-
down when the door is removed. Operation with the
door removed or ajar can permit the escape of danger-
ous fumes. All panels must be securely closed at all
times for safe operation of the Furnace.
* - This setting is equivalent to BAY24X045 relay ben-
efit.
** - This selection provides ENHANCED MODE, which
is a ramping up and ramping down of the blower
speed to provide improved comfort, quietness, and
potential energy savings. See Wiring Diagram
notes on the unit or in the Service Facts for com-
plete wiring setup for ENHANCED MODE. The
graph which follows, shows the ramping process.
See Wiring Diagram on the unit or in the Service
Facts for complete wiring setup for Enhanced
Mode.
AIRFLOW ADJUSTMENT
WARNING
!
Disconnect power to the unit before removing the
blower door. Allow a minimum of 15 seconds for IFC
power supply to discharge to 0 volts.
Failure to follow this warning could result in property
damage, personal injury or death.
18-CD24D1-2
The blower
The
The options for
NOMINAL
SELECTION
AIRFLOW
NONE
SAME
1.5 MINUTES
100% *
3 MINUTES
50%
Enhanced
50 - 100%
Mode**
Installer's Guide
WARNING
!
Operation with the door removed or ajar can permit the
escape of dangerous fumes.
curely closed at all times for safe operation of the Fur-
nace.
Failure to follow this warning could result in property
damage, personal injury or death.
Check inlet and outlet air temperatures to make sure
they are within the ranges specified on the Furnace rat-
ing nameplate. If the airflow needs to be increased or
decreased, see the Service Facts for information on
changing the speed of the blower motor.
80%
Dehumidify
50%
Fast Cooling
OFF
1
7.5
minute
minutes
This unit is equipped with a blower door switch which
cuts power to the blower and Gas Valve causing shut-
down when the door is removed.
ROOM AIR COMFORT CONTROL
HEAT ANTICIPATOR ADJUSTMENT
Set the Comfort Control heat anticipator according to
the current flow measured, or the settings found in the
notes on the Furnace wiring diagram (found in the SER-
VICE FACTS or inside the furnace casing).
WARNING
!
Should overheating occur, or the gas supply fail to
shut off, shut off the Gas Valve to the unit before shut-
ting off the electrical supply.
Failure to follow this warning could result in property
damage, personal injury, or death.
INSTRUCTIONS TO THE OWNERS
In the event that electrical, fuel, or mechanical
failures occur, the owner should immediately
turn the gas supply off at the manual Gas Valve,
located in the burner compartment. Also turn off
electrical power to the Furnace and contact a
qualified service technician.
BURNER BOX TEMPERATURE LIMIT DEVICE
All models are equipped with a manual reset tempera-
ture limit located on the Burner Box. In case of exces-
sive temperature, the limit will open and cause the cir-
cuit to open which shuts off all flow of gas.
All panels must be se-
100% if necessary
50%
Efficiency
OFF
3
minutes
25

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