American Standard Thermostat ACONT200AN11AA Manual

The American Standard ACONT200AN11AA is a non-programmable, single-stage heat/cool thermostat designed for residential HVAC systems. It features a simple, easy-to-read display, manual temperature control, system mode selection (Heat, Cool, Off, Auto), and fan control (On, Auto). Compatible with most 24VAC systems, it provides reliable temperature management for furnaces, air conditioners, and heat pumps (single-stage). Below are key sections for safety, features, installation, wiring, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation & Wiring 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. System Configuration 7. Operating Your Thermostat 8. Maintenance 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: Large LCD display, Temperature control buttons, System Mode switch, Fan switch, Front cover with mounting plate.

FeatureDescription
DisplayBacklit LCD showing current temperature and setpoint
Temperature ControlUp/Down buttons for setting desired temperature
System Mode SwitchHEAT, COOL, OFF, AUTO (automatic changeover)
Fan SwitchON (continuous fan) or AUTO (fan runs with HVAC cycle)
Compatibility24VAC single-stage heating and cooling systems
Power SourceSystem power (24VAC from HVAC equipment) or optional "C" wire
Temperature Range40°F to 99°F (4°C to 37°C)
Temperature SwingApproximately ±1°F (±0.5°C) differential
BacklightActivates with button press for easy viewing
MountingStandard wall plate for easy installation

Installation & Wiring

Turn off power to HVAC system at circuit breaker before installation.

  1. Remove old thermostat: Label existing wires according to terminal markings (R, W, Y, G, etc.).
  2. Mount new baseplate: Level and secure to wall using provided screws.
  3. Connect wires: Insert labeled wires into corresponding terminals on ACONT200AN11AA baseplate (R, W, Y, G, C if available).
  4. Attach thermostat: Align and snap onto baseplate.
  5. Restore power: Turn circuit breaker back on.

WARNING! Electrical shock hazard. Always turn off power before installation. If unsure, consult a qualified HVAC technician.

First-Time Setup

After installation and power restoration, configure basic settings.

  1. Set System Mode: Move switch to HEAT, COOL, or AUTO based on season.
  2. Set Fan Mode: Move switch to AUTO (recommended for efficiency) or ON.
  3. Set Temperature: Use Up/Down buttons to desired comfort level.
  4. Verify Operation: Listen for HVAC system to engage after a short delay.

CAUTION! Do not force switches or buttons. Ensure system mode matches your equipment type (e.g., do not set to COOL if you have heat-only system).

Specifications

Controls and Settings

Front Panel: LCD display, Temperature Up/Down buttons, System Mode switch (HEAT/COOL/OFF/AUTO), Fan switch (ON/AUTO).

Operation: Adjust temperature with Up/Down buttons. Change system mode based on season. Select fan operation.

Display Icons: Current temperature, Set temperature, System mode indicator, Fan indicator.

Temperature Scale: Can be switched between °F and °C (see installation guide for procedure).

System Configuration

For heat pump systems, O/B terminal setting may be required.

  1. Identify heat pump type: Determine if reversing valve energizes in COOL (O) or HEAT (B) mode.
  2. Set jumper: On baseplate, move O/B jumper to correct position (O or B).
  3. Connect wire: If using O/B terminal, connect heat pump reversing valve wire.

Tip: Refer to heat pump manufacturer's documentation for correct O/B setting. Default is usually O.

Operating Your Thermostat

Daily operation is simple and manual.

  1. To Heat: Set System Mode to HEAT. Use Up button to increase temperature setpoint.
  2. To Cool: Set System Mode to COOL. Use Down button to decrease temperature setpoint.
  3. Auto Changeover: Set System Mode to AUTO. Thermostat will automatically select HEAT or COOL based on room temperature vs. setpoint.
  4. Fan Control: Set to AUTO for normal operation (fan runs with HVAC cycles). Set to ON for continuous air circulation.
  5. To Turn Off: Set System Mode to OFF. HVAC system will not run.

WARNING! Do not rapidly change temperature settings. Allow system time to reach setpoint.

Maintenance

Minimal maintenance required. Keep thermostat clean and free from obstructions.

Clean display with soft, dry cloth. Do not use liquids or cleaners. Ensure vents around thermostat are not blocked by furniture or curtains.

CAUTION! Never spray cleaning fluids directly on thermostat. Do not open casing; no user-serviceable parts inside.

Regulatory Information

This thermostat complies with Part 15 of FCC Rules. Operation is subject to the condition that it does not cause harmful interference. This device complies with relevant safety standards. For technical support or warranty information, contact American Standard Heating & Air Conditioning at 1-800-228-2962 or visit www.americanstandardair.com.

Troubleshooting

SymptomPossible CauseCorrective Action
Blank displayNo powerCheck circuit breaker; verify wires are securely connected to R and Rc terminals.
System not turning onIncorrect mode, setpoint, or wiringEnsure System Mode is HEAT or COOL; check setpoint vs room temp; verify W (heat) or Y (cool) wire connection.
System runs continuouslyFan switch in ON positionSet Fan switch to AUTO. If problem persists, check G wire connection.
Incorrect temperature readingLocation issuesEnsure thermostat is not in direct sunlight, near heat sources, or in drafts.
Heat pump not reversing properlyIncorrect O/B settingVerify O/B jumper position matches heat pump type; check O/B wire connection.

Reset: Turn off power at breaker for 30 seconds, then restore.

Service: For persistent issues, contact qualified HVAC technician. American Standard support: 1-800-228-2962

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