American Standard Thermostat NEXIA ACONT724AS42DA Manual

The American Standard NEXIA ACONT724AS42DA is a programmable touchscreen thermostat designed for compatibility with American Standard HVAC systems. It features Wi-Fi connectivity for remote control via the Nexia app, 7-day programming, color touchscreen display, geofencing, energy usage reports, and support for multi-stage heating and cooling. 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 Wi-Fi & Nexia 7. Programming Schedules 8. Advanced Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Color Touchscreen Display, Wall Plate, Wire Terminals, Power Adapter (if required), Mounting Screws.

Feature	Description
Wi-Fi Connectivity	For remote control via Nexia app and smart home integration
7-Day Programming	Allows different schedules for each day of the week
Color Touchscreen	Intuitive interface with backlight
Geofencing	Automatically adjusts temperature based on your smartphone's location
Energy Reports	Provides usage data and efficiency tips
Multi-Stage Support	Compatible with up to 2-stage heating and 2-stage cooling systems
Humidity Control	Works with compatible humidifiers/dehumidifiers
Filter Change Reminder	Alerts when to replace HVAC air filter
Voice Control	Works with Amazon Alexa and Google Assistant
Vacation Hold	Set extended away periods with energy-saving temperatures

Installation

Unpack and inspect contents. Ensure HVAC system power is OFF at circuit breaker.

Remove old thermostat: Label wires, disconnect from old unit.
Mount new wall plate: Level and secure with screws.
Connect wires: Match labeled terminals (R, C, Y1, Y2, W1, W2, G, O/B, etc.).
Attach thermostat: Align and snap onto wall plate.
Restore power: Turn HVAC circuit breaker back ON.

WARNING! Installation should be performed by a qualified HVAC technician. Incorrect wiring can damage equipment.

First-Time Setup

Power on thermostat; follow on-screen prompts.

Select language: Choose ENGLISH (default).
Configure system type: Select heat pump, conventional, etc., as per your HVAC.
Set date and time: Ensure accurate schedule operation.
Connect to Wi-Fi: Enter network credentials for Nexia setup.
Create Nexia account: Follow app instructions for remote access.

CAUTION! Do not force thermostat onto plate. Ensure wires are secure and not pinched.

Specifications

Power: 24VAC from HVAC system or optional power adapter.
Display: 3.5-inch full-color LCD touchscreen.
Compatibility: Works with most 24VAC heating/cooling systems including heat pumps.
Wi-Fi: 802.11 b/g/n, 2.4GHz only.
Programming: 7-day, 4 periods per day.
Temperature Range: 40°F to 99°F (4°C to 37°C).
Humidity Range: 0% to 90% RH (with accessory).
Operating Temp: 32°F to 122°F (0°C to 50°C).
Warranty: 5-year limited warranty.

Controls and Settings

Access menus via touchscreen. Main Screen: Displays current temp, set point, mode, and humidity.

Touch Buttons: Menu, Up/Down, Mode (Heat/Cool/Auto/Off), Fan (Auto/On), Hold.

Settings Menu: System Setup (equipment configuration), Wi-Fi, Schedules, Preferences (display, units, backlight), Alerts (filter, maintenance), Dealer Info. Advanced: Calibration, test mode, reset.

Connecting to Wi-Fi & Nexia

Requires 2.4GHz Wi-Fi network and Nexia account.

From thermostat: Menu > Wi-Fi > Scan and select network > Enter password.
Download Nexia app on smartphone/tablet.
Create account or log in.
Add device: Follow in-app steps to pair thermostat.

Tip: Ensure smartphone is on same Wi-Fi network during setup. Disable VPN if connection fails.

Programming Schedules

Create energy-saving schedules for weekdays and weekends.

Access: Menu > Schedules.
Select day(s): Set for All Days, Weekdays, Weekends, or individual days.
Add periods: Up to 4 periods per day (Wake, Leave, Return, Sleep).
Set temp and mode for each period.
Save schedule.
Override temporarily: Press Hold for manual override until next scheduled period.

WARNING! Do not set extreme temperatures that could cause system short-cycling or pipe freeze risk.

Advanced Features

Geofencing: In Nexia app, enable location-based control to adjust temp when you leave/return. Energy Reports: View monthly usage in app. Filter Reminder: Set interval (1-12 months) in Alerts menu. Vacation Hold: Set extended away period from app or thermostat.

Care & Cleaning

Turn off power before cleaning. Use soft, dry cloth to wipe screen. Do not use liquids, sprays, or abrasive cleaners.

CAUTION! Avoid static electricity. Do not press screen with sharp objects.

Regulatory Information

FCC Compliance: This device complies with Part 15 of FCC Rules. Operation subject to conditions: (1) not cause harmful interference, (2) accept any interference received. ICES-003: Complies with Canadian standards. Copyright © American Standard Heating & Air Conditioning. For support, visit www.americanstandardair.com or contact 1-800-228-2962.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Blank screen	No power	Check circuit breaker; ensure wires (R, C) are connected.
Wi-Fi not connecting	Wrong credentials/network	Verify 2.4GHz network and password; restart router/thermostat.
HVAC not turning on	Incorrect settings/wiring	Verify system type in setup; check wire connections at thermostat and air handler.
Inaccurate temperature	Location/calibration	Relocate thermostat away from heat sources; use temperature calibration in settings.
Nexia app not updating	Internet/account issue	Check internet connection; log out and back into app; reboot thermostat.

Reset: Menu > Settings > Reset > Restore Factory Defaults (Note: erases all settings).

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