American Standard Thermostat ACONT303 Manual

The American Standard ACONT303 is a programmable thermostat designed for precise temperature control of heating and cooling systems. It features a backlit digital display, 7-day programming capability, temperature hold functions, system status indicators, and compatibility with most 24V HVAC systems. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Digital display with backlight, Mode button, Fan button, Up/Down temperature buttons, Hold button, Program button.

Installation

Unpack and inspect contents. Ensure power to HVAC system is turned off at circuit breaker.

1. Remove old thermostat: Turn off power, remove cover, label wires before disconnecting.
2. Mount new baseplate: Level and secure to wall using provided screws.
3. Connect wires: Match labeled wires to corresponding terminals (R, W, Y, G, C, etc.).
4. Attach thermostat: Align and snap onto baseplate.
5. Install batteries: Insert two AA batteries for backup power.
6. Restore power: Turn circuit breaker back on.

WARNING! Always turn off power before installation to prevent electrical shock. Incorrect wiring can damage HVAC equipment.

First-Time Setup

Power on thermostat; follow initial setup prompts.

1. Set time and day: Use Up/Down buttons to set current time and day of week.
2. Configure system type: Select conventional or heat pump system.
3. Set temperature format: Choose Fahrenheit or Celsius.
4. Program schedule: Set up 4 periods per day (Wake, Leave, Return, Sleep).
5. Set filter reminder: Program interval for filter change alerts (30-365 days).

CAUTION! Ensure proper wire connections before restoring power. Test system operation after installation.

Specifications

• Power Requirements: 24V AC from HVAC system; 2 AA batteries for backup.
• Temperature Range: 40°F to 99°F (4°C to 37°C).
• Temperature Accuracy: ±1°F (±0.5°C).
• Display: Backlit LCD with adjustable contrast.
• Programming: 7-day, 4 periods per day programming capability.
• Compatibility: Most 24V heating and cooling systems, including single-stage and heat pumps.
• Wire Terminals: R, Rc, Rh, W, Y, G, O/B, C, Aux/E.
• Dimensions: 5.5" x 3.5" x 1" (140mm x 89mm x 25mm).
• Operating Temperature: 32°F to 122°F (0°C to 50°C).

Controls and Settings

Access settings via front panel buttons. Display shows current temperature, set temperature, time, and system status.

Buttons: MODE (Heat/Cool/Auto/Off), FAN (Auto/On), UP/DOWN (temperature adjustment), HOLD (temporary override), PROGRAM (schedule setup), MENU (advanced settings).

Basic Settings: Temperature setpoint, system mode, fan operation. Advanced Settings: Program schedule, filter reminder interval, temperature limits, keypad lock, system configuration, calibration offset. Display Settings: Backlight timeout, temperature format, contrast adjustment.

Connecting to HVAC System

Compatible with most 24V systems including gas, oil, electric heat, and heat pumps.

1. Identify system type: Conventional or heat pump.
2. Label existing wires: Note colors and terminal designations.
3. Connect to terminals: Match wires to correct terminals on baseplate.
4. Common wire: Connect C wire if available for continuous power.
5. Heat pump systems: Connect O/B wire for reversing valve control.

Tip: Take photo of old thermostat wiring before disconnecting for reference.

Programming Schedule

Create energy-saving schedule with 4 periods per day.

1. Press PROGRAM button to enter programming mode.
2. Select day: Choose individual days or copy to other days.
3. Set Period 1 (Wake): Set time and temperature for morning.
4. Set Period 2 (Leave): Set time and temperature for daytime when away.
5. Set Period 3 (Return): Set time and temperature for evening return.
6. Set Period 4 (Sleep): Set time and temperature for nighttime.
7. Review schedule: Scroll through all periods to verify settings.
8. Exit programming: Press PROGRAM again to save and exit.

WARNING! Do not set extreme temperature differentials (more than 5°F) between periods as this may strain HVAC system.

Energy Saving Features

Temperature Hold: Temporary override of programmed schedule. Adaptive Recovery: Learns system recovery time to reach setpoint by scheduled time. Filter Change Reminder: Reduces energy consumption by maintaining clean filters. Vacation Mode: Extended hold period for energy savings while away.

Care & Cleaning

Turn off power before cleaning. Use soft, dry cloth only; do not use liquids or cleaning sprays.

CAUTION! Do not spray liquids directly on thermostat. Keep away from moisture and direct sunlight.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. UL Listed: Meets safety standards for thermostats. Copyright © American Standard; trademarks of American Standard Companies. For support, visit www.americanstandard.com or contact 1-800-843-0304.

Troubleshooting

Reset: Remove batteries for 30 seconds to reset to factory defaults.

Service: 1-800-843-0304; www.americanstandard.com