American Standard Thermostat ACONT302 Manual

The American Standard ACONT302 is a programmable thermostat designed for residential heating and cooling systems. It features a backlit digital display, 7-day programming capability, temperature hold functions, system status indicators, and compatibility with most 24VAC HVAC systems. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting to HVAC System 7. Programming Schedule 8. Energy Saving Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Digital display with backlight, Program buttons, System switch (Heat/Cool/Off), Fan switch (Auto/On), Temperature adjustment buttons, Hold button.

Feature	Description
Digital Display	Backlit LCD showing temperature, time, and system status
7-Day Programming	Set different schedules for each day of the week
Temperature Hold	Temporarily override programmed schedule
System Switch	Selects Heat, Cool, or Off mode
Fan Switch	Controls fan operation (Auto or On)
Battery Backup	Maintains settings during power outages (requires 2 AA batteries)
Filter Change Alert	Reminder to replace HVAC air filter
Keypad Lock	Prevents unauthorized changes to settings
Temperature Limits	User-adjustable minimum and maximum temperature settings
Compatibility	Works with most 24VAC single-stage heating and cooling systems

Installation

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

Remove old thermostat: Turn off power, remove cover, label wires, disconnect from terminals.
Mount new baseplate: Use provided screws and level to ensure proper mounting.
Connect wires: Match labeled wires to corresponding terminals (R, W, Y, G, C, etc.).
Attach thermostat: Align and snap onto baseplate.
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 initial settings.

Set time and day: Press SET CLOCK button, use arrows to adjust.
Select temperature format: Press MENU, navigate to SYSTEM SETTINGS, choose °F or °C.
Configure programming: Press PROGRAM to set up 4 periods per day (Wake, Leave, Return, Sleep).
Set filter change reminder: Access MAINTENANCE menu to set interval (30-365 days).
Install batteries: Insert 2 AA batteries for backup power.

CAUTION! Ensure all wires are securely connected to prevent system malfunction.

Specifications

Power Requirements: 24VAC 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.
Compatibility: Single-stage heat/cool systems (gas, oil, electric, heat pump).
Wire Terminals: R, Rc, Rh, W, Y, G, C, O/B, Aux/E.
Dimensions: 5.5" H x 3.5" W x 1" D (140mm x 89mm x 25mm).
Operating Temperature: 32°F to 122°F (0°C to 50°C).
Warranty: 5-year limited warranty.

Controls and Settings

Access menus via MENU button. Front Panel: SYSTEM (Heat/Cool/Off), FAN (Auto/On), UP/DOWN arrows, HOLD, MENU, PROGRAM, SET CLOCK.

Display Icons: Flame (heating), Snowflake (cooling), Fan (blower on), Clock (schedule active), Hold (temperature hold active), Battery (low battery).

Settings: Time/Day, Temperature Format, Program Schedule, Temperature Limits (min/max), Filter Change Alert, Keypad Lock, System Test, Factory Reset.

Connecting to HVAC System

Match thermostat wires to system terminals. Common configurations:

Conventional Systems: R (24V power), W (Heat), Y (Cool), G (Fan), C (Common).
Heat Pump Systems: R, O/B (Reversing valve), Y (Compressor), G, C, Aux/E (Aux heat).
Dual Transformer Systems: Rc (Cooling power), Rh (Heating power).

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

Programming Schedule

Create energy-saving schedule with 4 periods per day.

Press PROGRAM button.
Select day (MON, TUE, WED, THU, FRI, SAT, SUN, or COPY to duplicate).
Set times and temperatures for each period:
- Wake: Morning temperature
- Leave: Energy-saving temperature when away
- Return: Evening temperature
- Sleep: Nighttime energy-saving temperature
Press DONE to save.
Use HOLD button to temporarily override schedule (TEMPORARY or PERMANENT hold).

WARNING! Do not set temperatures too extreme (below 50°F or above 90°F) to prevent system damage.

Energy Saving Features

Adaptive Recovery: Learns how long system takes to reach temperature, starts early to meet schedule. Temperature Limits: Set minimum heat and maximum cool temperatures. Filter Alert: Reminds when to change filter for optimal efficiency.

Care & Cleaning

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

CAUTION! Never spray liquids directly on thermostat. Keep away from direct sunlight and moisture sources.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. UL Listed: Meets safety standards. Copyright © American Standard Heating & Air Conditioning; trademarks of American Standard Companies. For support, visit www.americanstandard.com or contact 1-800-228-2962.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Blank display	No power	Check circuit breaker; ensure wires connected properly; replace batteries.
System not turning on	Incorrect settings	Verify SYSTEM switch not in OFF; check temperature setting above/below room temp.
Incorrect temperature reading	Location issues	Relocate thermostat away from heat sources, drafts, or direct sunlight.
Short cycling	Settings or equipment	Adjust temperature differential in installer settings; check HVAC equipment.
Fan runs continuously	FAN switch setting	Set FAN switch to AUTO instead of ON.
Low battery indicator	Weak batteries	Replace both AA batteries with fresh ones.

Reset: Menu > System > Factory Reset to restore default settings (erases all programming).

Service: 1-800-228-2962; www.americanstandard.com