Abnormal Conditions - American Standard UY060R9V3W Series Installer's Manual

The following table and graph explain the delay-off settings:
COOLING OFF - DELAY OPTIONS
SWITCH SETTINGS
5 - OFF 6 - OFF
5 - ON 6 - OFF
5 - OFF 6 - ON
5 - ON 6 - ON
* - This setting is equivalent to BAY24X045 relay
benefit.
** - 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
complete wiring setup for ENHANCED MODE. The
graph which follows, shows the ramping process.
100% if necessary
80%
Dehumidify
50%
Fast Cooling
OFF
1 7.5
minute minutes
See Wiring Diagram on the unit or in the Service Facts
for complete wiring setup for Enhanced Mode.
This unit is equipped with a blower door switch which cuts
power to the blower and gas valve causing shutdown when the
door is removed. Operation with the door removed or ajar can
permit the escape of dangerous fumes. All panels must be
securely closed at all times for safe operation of the furnace.
NOTE TO INSTALLER
Review the following warnings with the owner. Review
contents of USER'S INFORMATION MANUAL with the
owner.
ROOM AIR THERMOSTAT
HEAT ANTICIPATOR ADJUSTMENT
Set the thermostat heat anticipator according to the current
flow measured, or the settings found in the notes on the
furnace wiring diagram (found in the SERVICE FACTS or
inside the furnace casing).
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 the service agency designated
by your dealer.
18-CD20D3-18
NOMINAL
SELECTION
AIRFLOW
NONE SAME
1.5 MINUTES 100% *
3 MINUTES 50%
** 50 - 100%
50%
Efficiency
OFF
3
minutes
Installer's Guide
BURNER BOX TEMPERATURE LIMIT DEVICE
All models are equipped with a manual reset temperature
limit located on the burner box. In case of excessive tempera-
ture, the limit will open and cause the circuit to open which
shuts off all flow of gas.

ABNORMAL CONDITIONS

1. EXCESSIVE COMBUSTION PRESSURE (WIND IN
EXCESS OF 40 M.P.H.) VENT OR FLUE BLOCKAGE
On a call for heat, the variable speed draft inducer must
first ramp up to speed and close the pressure switch
before the ignition sequence is allowed to begin. If the
pressure switch does not close, the motor will ramp up to
maximum speed and continue to operate there for about
1 minute. After one minute the integrated furnace
control will turn the motor off for about 30 seconds then
back on in an attempt to reestablish proper operation.
This condition is indicative of a highly restricted or
blocked inlet or outlet vent pipe or a failed pressure
switch.
If pressure against induced draft blower outlet becomes
excessive, the pressure switch will open. If the pressure
switch is open for more than 3.5 seconds, the variable
speed draft inducer will speed up and attempt to reclose
the pressure switch.
If the pressure switch is not closed within 12 seconds or
if the maximum speed of the motor is reached, the draft
inducer sends a fault signal to the integrated furnace
control. If the unit is operating in second stage, an
inducer fault will cause the furnace control to transition
the system to first stage and it will operate there for 10
minutes before attempting to run again in second stage.
If the unit is operating in first stage, an inducer fault
will cause the furnace control to shut the system down
and wait 30 seconds before attempting to reestablish
operation in first stage.
2. LOSS OF FLAME
If loss of flame occurs during a heating cycle, or flame is
not present at the sensor, the flame control module will
close the gas valve. The flame control module will then
recycle the ignition sequence, then if ignition is not
achieved, it will shut off the gas valve and lock out the
system.
3. POWER FAILURE
If there is a power failure during a heating cycle, the
system will restart the ignition sequence automatically
when power is restored, if the thermostat still calls for
heat.
4. GAS SUPPLY FAILURE
If loss of flame occurs during a heating cycle, the system
integrated control module will recycle the ignition
sequence, then if ignition is not achieved, the integrated
control module will shut off the gas valve and lock out
the system.
5. INDUCED DRAFT BLOWER FAILURE
Please refer to the variable speed draft inducer trouble-
shooting manual for diagnostic assistance.
6. CONDENSATE DRAIN BLOCKAGE
If the condensate drain is blocked, either by debris,
improper draining, or by freezing condensate, the
pressure switch will sense the accumulation of conden-
sate in the furnace drain pan.
The unit will not operate properly until the condensate
drain has been cleared, and the condensate flows freely.
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