American Standard Thermostat ACONT102 Manual

The American Standard ACONT102 is a non-programmable digital thermostat designed for single-stage heating and cooling systems. It features a large, easy-to-read backlit display, simple up/down temperature adjustment, system mode selection (Heat, Cool, Off), and fan control (Auto, On). Compatible with most 24VAC systems, it includes installation instructions for wiring, setup, and basic troubleshooting. 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. Wiring Configuration 7. Operation 8. System Mode Selection 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Digital backlit display, Temperature adjustment buttons, System mode switch, Fan control switch, Mounting plate, Wire terminals.

Feature	Description
Digital Display	Large LCD with backlight for easy reading
Temperature Adjustment	Up/Down buttons for setting desired temperature
System Mode Switch	Select Heat, Cool, or Off
Fan Control Switch	Select Auto (fan runs with system) or On (continuous fan)
Mounting Plate	For secure wall installation
Wire Terminals	Labeled terminals (R, W, Y, G, C) for system connection
Battery Backup	Uses AA batteries to maintain settings during power loss (if applicable)
Temperature Hold	Manual override to maintain set temperature
Filter Change Reminder	Optional indicator light or display message
System Indicator Lights	LEDs for Heat, Cool, and Fan operation

Installation

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

Remove old thermostat: Label wires, disconnect from old unit.
Mount new baseplate: Level and secure to wall using provided screws.
Connect wires: Match labeled wires (R, W, Y, G, C) to corresponding terminals on baseplate.
Attach thermostat: Align and snap onto baseplate.
Restore power: Turn circuit breaker back on.

WARNING! Electrical shock hazard. Ensure power is off before handling wires. If unsure, consult a qualified HVAC technician.

First-Time Setup

After installation and power restoration, configure basic settings.

Set temperature: Use Up/Down buttons to desired setting.
Select system mode: Switch to Heat, Cool, or Off as needed.
Set fan mode: Switch to Auto or On.
Check operation: Verify system turns on and reaches set temperature.
Install batteries: If model includes battery backup, insert AA batteries.

CAUTION! Do not force switches or buttons. Ensure system mode matches season (Heat for winter, Cool for summer).

Specifications

Type: Non-programmable digital thermostat.
Compatibility: Single-stage heating and cooling systems (24VAC).
Power Source: 24VAC from HVAC system; optional battery backup (AA x2).
Temperature Range: 40°F to 90°F (4°C to 32°C).
Display: Backlit LCD, shows setpoint and room temperature.
Controls: Mechanical switches for System and Fan; buttons for temperature.
Wiring: Standard terminals: R (power), W (heat), Y (cool), G (fan), C (common).
Operating Temp: 32°F to 122°F (0°C to 50°C).
Dimensions: Standard wall plate size.

Controls and Settings

Front Panel: Temperature Up/Down buttons, System Mode switch (Heat/Cool/Off), Fan switch (Auto/On). Display shows set temperature and room temperature.

Operation: Adjust temperature with buttons; system will run to reach setpoint. Use System switch to select heating or cooling mode. Use Fan switch for automatic or continuous fan operation.

Advanced Features: Filter change reminder (if equipped), temperature hold function, battery indicator (if applicable).

Wiring Configuration

Standard 5-wire setup for basic single-stage systems.

Turn off HVAC system power.
Identify wires from wall: Typically color-coded (Red, White, Yellow, Green, Blue/Black).
Connect to baseplate terminals:
- R (Red) – 24VAC Power
- W (White) – Heat
- Y (Yellow) – Cool
- G (Green) – Fan
- C (Blue/Black) – Common
Secure wires and snap thermostat onto baseplate.

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

Operation

Daily use for temperature control.

Set temperature: Press Up or Down button until desired temperature shows on display.
Select mode: Move System switch to Heat (for heating) or Cool (for air conditioning).
Fan setting: Set Fan switch to Auto (fan runs only when system is on) or On (fan runs continuously).
System off: Move System switch to Off to turn off heating/cooling.
Temperature hold: Press and hold Up or Down button to override schedule (if applicable).

WARNING! Do not set temperature too high or too low; extreme settings can strain system.

System Mode Selection

Choose correct mode for season and comfort.

Heat: Use in colder months. System will activate furnace or heat pump when room temperature falls below setpoint.
Cool: Use in warmer months. System will activate air conditioner when room temperature rises above setpoint.
Off: Turns off heating and cooling. Fan may still run if set to On.
Fan Auto/On: Auto runs fan with system cycles; On runs fan continuously for air circulation.

Care & Maintenance

Keep thermostat clean and free of obstructions.

Cleaning: Wipe display and casing with dry, soft cloth. Do not use liquids or sprays.
Batteries: Replace backup batteries annually or when low battery indicator appears.
Filter reminder: Reset filter change reminder after replacing HVAC filter (if equipped).
Check wiring: Ensure wires are secure behind thermostat if performance issues arise.

CAUTION! Do not open thermostat casing. No user-serviceable parts inside.

Regulatory Information

UL Listed. Complies with FCC Part 15 for digital devices. For use with 24VAC systems only. Copyright © American Standard Heating & Air Conditioning. For support, visit www.americanstandard.com or contact customer service at 1-800-STATD-20 (1-800-782-8320).

Troubleshooting

Symptom	Possible Cause	Corrective Action
Blank display	No power	Check circuit breaker; ensure wires are connected securely at R and C terminals.
System not turning on	Incorrect mode or setpoint	Verify System switch is in Heat or Cool; set temperature above (Cool) or below (Heat) room temp.
Inaccurate temperature reading	Location or drafts	Relocate thermostat away from heat sources, drafts, or direct sunlight.
Fan not running	Fan switch or wiring	Set Fan switch to On; check G wire connection.
Short cycling	Wiring or system issue	Verify wiring matches diagram; consult HVAC technician if problem persists.

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

Service: 1-800-STATD-20; www.americanstandard.com