American Standard ACONT401AN21MA User manual

Fan Mode
Filter/OD
$
ACONT401AN21MA
Comfort Control
User Manual
American Standard Inc.
6200Troup Highway
Tyler,Texas 75711
For more information contact
your local dealer (distributor)
Pub. No. 12-5037-01

Page - 23
Page - 2
Fan Mode
Filter/OD
$
Energy Savings
Page 10.
Up Arrow - Increase
temperature Page 5.
Down Arrow - Decrease
temperature Page 5.
Filter Reminder /
Outdoor Temperature
Page 7.
Fan ON / AUTO
Page 6.
Mode: Cool, Heat,
Auto, Off, EMHeat
Page 4.
Comfort
Information
Drawer Page 16.
Pub. No. 12-5037-01
Table Of
Contents Page
3 Introduction
4-11 Keypad functions
12-16 Features
17 Factory settings
18-19 Comfort Control Setup
20-21 Troubleshooting
22-23 Warranty
Pub. No. 12-5037-01
Some states do not allow limitations on how long an implied warranty last or do not
allow the exclusion or limitation of incidental or consequential damages, so the above
limitation may not apply to you. This warranty gives you specific legal rights, and you
may also have other rights which vary from state to state.
Parts will be provided by our factory organization or an authorized service organization in
your area. All you need to do is look us up in the Yellow Pages or write to the address
given below. If you wish further help or information concerning this warranty, contact:
American Standard Inc.
Troup Highway
Tyler, Texas 75711-9010
Attention: Manager, After Sale Support

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Pub. No. 12-5037-01
Introduction
Congratulations on the purchase of your new American Standard Comfort Control!
Your Comfort Control combines the latest digital control technology with intuitive func-
tions that make this control simple to understand and easy to operate. You’ll enjoy lower
utility bills at the touch of a button with the energy efficiency features built into your
Comfort Control. Your comfort settings are automatically stored in the Comfort Control’s
memory eliminating the need for battery backup in the event of power loss. Simply
follow the steps in this instruction manual and begin enjoying the benefits of your new
American Standard Comfort Control.
Pub. No. 12-5037-01
Warranty Limited Warranty
Low Voltage Comfort Control
This warranty is extended by American Standard Inc., to the original purchaser and to any
succeeding owner of the real property to which the Comfort Control is originally
affixed, and applies to products purchased and retained for use within the U.S.A. and
Canada.
If any part of your Comfort Control fails because of a manufacturing defect within 5
years from the date of the original purchase, Warrantor will furnish, without charge, a
new Comfort Control. Any local transportation, related service labor and diagnosis
calls are not included.
This Warranty does not cover failure of your Comfort Control if it is damaged while in
your possession or if the failure is caused by unreasonable use. In no event shall Warran-
tor be liable for incedental or consequential damages. In no event shall any implied
warranty of merchandise or fitness for use exceed the terms of the limited warranty
stated above.

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Pub. No. 12-5037-01
Keypad
Functions
Mode
Mode
MODE
- Pressing this key changes the system mode to Heat, Emergency Heat, Cool,
Automatic or Off. NOTE: Emergency Heat available only on Heat Pump
applications.
A border will appear around the mode on the display
to show the system mode you’ve selected.
Pub. No. 12-5037-01
Table 2 Troubleshooting
(Continued)
Symptom Possible Cause Action
Heating will not come
on.
1. System Mode not set to Heat.
2. Minimum off time delay being enforced. "waiting displayed".
3. Loose connection to control or system.
4. Heating system requires service or
control requires replacement.
1. Set Mode to heat and raise the setpoint above room temperature.
2. If heating does not come on within 5 minutes, Check Heating.
3. Check - Repair connections.
4. Repair system / Replace control.
Cooling will not come
on.
1. System Mode not set to Cool.
2. Minimum off time delay being enforced "waiting displayed".
3. Loose connection to control or system.
4. Cooling system requires service or
control requires replacement.
1. Set Mode to cool and lower the setpoint below room temperature.
2. If cooling does not come on within 15 minutes, contact servicer.
3. Repair connections.
4. Repair system / Replace control.
Cool ON or Heat ON
is displayed, but no
warm or cool air is
coming from the
registers.
1. The heating equipment turns on the
fan when the furnace has warmed up to a
setpoint.
2. Heating or cooling equipment is not
operating.
1. Wait one minute after seeing the ON icon and then check the registers.
2. Check Heating and Cooling system.
Control does not
respond to keypad
presses.
1. "Keypad locked" icon is displayed on LCD.
2. Keypad failure.
1. Unlock keypad - press Up+Down arrow together until "Keypad Locked"
disappears.
2. Replace Control.
Fan does not operate
properly in heat or
cool mode.
1. Incorrect wiring.
2. Heating or cooling equipment inoperative.
1. Correct wiring.
2. Repair system.
Fan runs all the time. 1. Fan mode set to ON.
2. Shorted control wiring.
1. Set fan mode to AUTO.
2. Check / Repair wiring.

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Pub. No. 12-5037-01
UP / DOWN Arrow
- Use these keys to raise or lower the Heat or Cool Setting.
- The first key press turns on the back lighting and a border around the setting to be
adjusted without changing the setting.
- Pressing the Up or Down arrow again will raise or
lower the setting that has the border around it.
- If you press and hold the Up or Down arrow, the temperature setting will advance
rapidly.
- When the control is set to Auto mode, pressing the Mode key once changes the position
of the border to heat or cool.
Pub. No. 12-5037-01
Trouble
-shooting
Table 2 Troubleshooting
Symptom Possible Cause Action
Display will not come on.
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch OFF.
3. Furnace blower compartment door or panel
loose or not properly installed.
1. Replace fuse or reset breaker.
2. Turn switch to ON.
3. Replace door panel in proper position to engage safety interlock or
door switch.
Temperature display is incorrect. Temperature display needs calibration. Calibrate Sensor - User Setup Step 49.
Outdoor temperature display is
incorrect.
Temperature display needs calibration.
Outdoor sensor located in poor sensing location.
1. Calibrate Sensor - User Setup Step 50.
2. Disconnect sensor and check circuit resistance value - Table 4.
3. Relocate outdoor sensor.
Cannot set Heating setpoint
above 80 degrees Deadband between Heating and Cooling set to high Decrease Deadband setting - User Setup Step 42.
"Service" Flashing on and off. Control EEPROM write error. Press any key and Check / Re-enter Setup Choices.
"Service" solid on and "--" in
temperature display. Indoor temperature sensor open or shorted Replace Control
Outdoor temperature display
shows "--" and Service indicator
on solid.
Outdoor temperature sensor open or shorted 1. Check outdoor sensor wiring.
2. Replace outdoor sensor.
Temperature setting will not
change. (Example: Cannot set
heating higher or cooling lower).
1. Upper and/or lower temperature limits were
reached.
2. "Keypad locked" is displayed on LCD.
1. Check the temperature setpoints:
Heating limits are 40 - 85F.
Cooling limits are 65 - 90F.
2. Unlock keypad - press Up+Down arrow together until icon disappears.

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Pub. No. 12-5037-01
FAN
- Pressing this key selects whether the indoor fan motor runs in automatic or
continuous mode.
The FAN ON indicates that you have selected to
operate the fan in continuous mode.
Pressing the Fan keypad button again returns the
indoor fan mode of operation to automatic and FAN
ON goes away.
Fan
Fan
Keypad
Functions
(cont-)
Pub. No. 12-5037-01
Lock - Unlock Keypad:
Press and hold Up Arrow and Down Arrow at the same time for several seconds.
(“Keypad Locked” icon will display on LCD screen)
User
Setup
Options
(cont-)
Table 1
Comfort Control Setup
Menu Item Factory
Setting
Setting (Choices)
(Press UP or DOWN arrow)
Step
(Press
Mode or
Fan)
Menu Item Factory
Setting
Setting (Choices)
(Press UP or DOWN arrow)
Step
(Press Mode or Fan)
Temperature
Display 00 = Fahrenheit
1 = Celcius 40
Energy Savings -
Heating Setpoint
Offset
51 - 45 Degrees Fahrenheit
1 - 25 Degrees Celcius 46
Auto or Manual
Changeover 10 = Manual 1 = Auto 41 Indoor Filter Timer Method 00 = Calendar Days 1 = Fan Run Time Days 47
Setpoint Deadband 3 2 - 10 Degrees 42 Indoor Filter
Reminder - Days 30 1 - 180 Days
0 = Disable 48
Waiting Icon 1 0 = Disable
1 = Enable 43 Calibrate Indoor
Temperature 0
Calibrated Room Temperature
+ / - 5 Degrees (1/2 degree
increments)
49
Cooling Droop 1
0 = Off
1 = 1 Degree
2 = 2 Degrees
44 Calibrate Outdoor
Temperature 0
Calibrated Outdoor Temperature
+ / - 5 Degrees (1/2 degree
increments)
50
Energy Savings -
Cooling Setpoint
Offset
51 - 25 Degrees Fahrenheit
1 - 15 Degrees Celcius 45 Exit Setup
(Press Mode) SA
SA = Save
US = Default User Settings
CA = Cancel
99
(Exit)
Note: Pressing the Energy Savings Key ($) anytime during setup will advance to step 99.
Step 99 - Make setting selection and then press MODE to exit.
SAve = Save selections
USer = Default user settings
CAncel = Cancel Selections for current session and return to previous session selections.

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Filter/OD
Pub. No. 12-5037-01
FILTER/OD
Filter/OD
- When the optional outdoor sensor is installed, outdoor temperature can be
viewed on the Comfort Control’s display by simply pressing the “FILTER/OD”
key.
Pub. No. 12-5037-01
Entering User Setup:
Press and hold the MODE and FAN keypad buttons at the same time.
Keypad Navigation:
- Use the MODE or FAN buttons to navigate forward and backward through the Setup steps.
- Press MODE to advance forward to the next step.
- Press FAN to return to the previous step.
- Use the UP and DOWN arrow keypad buttons to select or change Setup options.
User
Setup
Options

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Pub. No. 12-5037-01
Filter/OD
Keypad
Functions
(cont-)
Filter/OD
FILTER/OD
- Press this key twice to display how many days remain before time to replace or
clean the filter. The “FILTER/OD” indicator will flash on the display when the
filter timers days remaining reaches zero.
- Press the “FILTER/OD” key twice after cleaning or
replacing the filter to turn off the filter indicator and
reset the timer.
- If the filter is serviced before the timer expires, press the “FILTER/OD” key twice to
display the “days remaining for filter”. Press the Down arrow to change the remaining
days to zero. Press the “FILTER/OD” key twice to reset the timer.
Pub. No. 12-5037-01
Factory
Default
Settings
User Defined Options and Factory Default Settings: (See Table 1, page 19)
Temperature Display - Fahrenheit or Celsius (Default is Fahrenheit)
Auto or Manual Changeover - (Default is Auto)
Setpoint Deadband - 2 - 10 degrees (Default is 3 degrees)
Waiting Indicator - Enable or Disable (Default is Enable)
Cooling Droop - Off, 1, or 2 degrees (Default is 1 degree)
Energy Saving Cooling Setpoint Offset - 0 - 25 degrees (Default is 5 degrees)
Energy Saving Heating Setpoint Offset - 0 - 45 degrees (Default is 5 degrees)
Indoor Filter Timer Method - Calendar Days or Fan Run Time Days - (Default is Calendar Days)
Indoor Filter Timer Days - 1 - 180 days (Default is 30 days)
Calibrate Indoor Temperature - + / - 5 Degrees (Default is 0 degrees)
Calibrate Outdoor Temperature - + / - 5 Degrees (Default is 0 degrees)

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Pub. No. 12-5037-01
Filter/OD
Filter/OD
FILTER/OD
- If you press and hold the filter/OD keypad button for several seconds, the display
changes to the Quick Setup option for the filter timer. Use the UP or DOWN
arrow keypad buttons to change the timer setting if desired, 1 - 180 days.
NOTE: Setting to 0 will disable filter timer.
- Press the filter/OD button again to return to normal
display or just wait a few seconds and the display will
return on its own.
Pub. No. 12-5037-01
Page - 16
Calibrate Outdoor Temperature
This option allows calibration (or deliberate miscalibration) of the outdoor temperature
sensor. The selected number is number of degrees, plus or minus, which will be added to
actual temperature. The number can range between + 5 and - 5 degrees in 1/2 degree incre-
ments. Factory default is 0. This adjusted value will be used and displayed as actual tempera-
ture. For example, if 2 is selected, 72 degrees actual will read 74 degrees.
Comfort Information Drawer
The drawer attached to the mounting base of the control is designed to provide a convenient
location for the user to locate their local servicer. A standard business card can be folded and
inserted into the slot on the drawer to remind the User whom to call when service is re-
quired.
Features
(cont-)

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Pub. No. 12-5037-01
$$
Keypad
Functions
(cont-) $
Energy Savings
- Use this key to lower your systems energy consumption and save money at the
same time! Pressing the Energy Savings keypad button changes the indoor tempera-
ture setting to a warmer temperature when the system is operating in the cooling
mode and to a cooler indoor temperature setting when operating in the heating
mode. Energy Savings will appear on the display.
Example: Heating offset of 8 degrees.
Pub. No. 12-5037-01
Service Indicator
“SERVICE” automatically flashes when an internal fault or error has been detected by the
control. See Table 2 on pages 20 & 21.
Wait Indicator
“WAITING” will illuminate when the indoor setpoint is moved in the direction of calling
for additional system capacity. “WAITING” indicates that the control is adjusting to the new
settings.
Calibrate Indoor Temperature
This option allows calibration (or deliberate miscalibration) of the room temperature sensor.
The selection is the number of degrees added to actual temperature. The number can range
between + 5 and - 5. Factory default is 0. This adjusted value will be used as actual tempera-
ture for both display and control action. For example, if 2 is selected, 72 degrees actual will
read 74 degrees.

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Pub. No. 12-5037-01
$
- Press and hold the Energy Savings keypad button to
gain Quick Access to the Energy Savings setup screen.
- Use the UP or DOWN arrow keys to change the
offset degrees setting.
NOTE: Energy Savings offset degrees are selected separately for heating and cooling.
Press the Mode keypad button while viewing this screen to access the Cooling or Heat-
ing offset degrees setting, then use the UP or DOWN arrow key to select the desired
number of offset degrees.
- Press the Energy Savings keypad button again to return to normal display or just wait a
few seconds and the display will return on its own.
Pub. No. 12-5037-01
Filter Reminder
“FILTER/OD” will automatically flash to remind the homeowner that its time to change the
filter once the preset time has expired. Pressing the “FILTER/OD” keypad button automati-
cally resets the internal clock timer. Once the timer has been reset, the number of days
remaining till the next filter change can easily be determined by simply pressing the “FIL-
TER/OD” keypad button. Pressing and holding the “FILTER/OD” keypad button provides
quick access to the filter timer setup.
Energy Savings
The Energy Savings mode can provide energy savings by offsetting the indoor setpoint to a
cooler temperature setting for heating and a warmer temperature setting for cooling. The
Energy Savings mode is activated by pressing the Energy Savings key “$” on the control
keypad. Pressing the Energy Savings key “$” again deactivates the Energy Savings mode.
Pressing and holding the Energy Savings key “$” provides quick access to the offset degree
setup for the current operating mode.
Default Factory Settings
The control is shipped with a set of factory default settings. The factory default settings can
be restored at any time using the control configuration menu. Please see Page 17 for a com-
plete listing of factory shipped default settings.
Features
(cont-)

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Pub. No. 12-5037-01
Features
Adjusting to
new setting
Auto Changeover
When the system mode is set to Auto, the control automatically switches between heating and
cooling modes to maintain the desired comfort level.
Appears when
equipment is
energized.
Setpoint Deadband
The number of degrees separating Heating and Cooling setpoints. Neither the heating or
cooling system operate when the indoor temperature is within the deadband. The amount of
separation between mode setpoints is user defined between 2 and 10 degrees. When the
control is set to Auto, and the cooling setpoint is changed to a cooler setting, the heating
setpoint also changes to maintain the selected degrees separation.The same action occurs
when the heating setpoint is changed to a warmer temperature.
Outdoor Temperature Display - (optional sensor must be installed)
View outdoor temperature from within the conditioned space by pressing the Filter/OD
keypad button. The Comfort Control’s display will return to normal display on its own
within a few seconds.
Pub. No. 12-5037-01
Backlit Display & Keys
The liquid crystal display and keypad will illuminate whenever a keypad button is pressed to
improve thermostat visibility. The back light stays on for 10 seconds after the last key press.
The Up and Down arrows are continuously lit.
Cooling Droop
Cooling Droop is an automatic function that cycles the compressor on to improve indoor
comfort by removing moisture from the air. The Droop cycle is activated when space tem-
perature is at or below the cooling sensible temperature setpoint. When this function is
active, the control will control indoor temperature at 1 or 2 degrees below cooling setpoint.
The Droop cycle is deactivated when the indoor temperature rises above the cooling
setpoint.
Keypad Lock
Locking the control keypad can help prevent unwanted tampering or changing the control
settings by pressing the controls UP and DOWN arrow keypad buttons at the same time and
holding for 2 seconds. The “KEYPAD LOCKED” icon will appear on the control’s display.
Repeating this combination unlocks the keypad.