American Standard Thermostat ACONT800 Series Manual

The American Standard ACONT800 Series is a programmable thermostat designed for precise temperature control of HVAC systems. It features a backlit digital display, multiple programming schedules (7-day, 5+2-day, or non-programmable), system mode selection (Heat, Cool, Auto, Off), fan control (Auto, On), filter change reminder, and compatibility with single-stage and multi-stage 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 Schedules 8. Advanced Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Backlit LCD display, Menu/Select button, Up/Down arrows, System Mode button, Fan button, Hold button, Program button.

Feature	Description
Backlit Display	Easy-to-read screen with adjustable backlight
Programmable Schedules	7-day, 5+2-day, or non-programmable options
System Modes	Heat, Cool, Auto, Off
Fan Control	Auto or Continuous On
Filter Change Reminder	Alerts when filter needs replacement
Compatibility	Single-stage and multi-stage HVAC systems
Temperature Range	40°F to 99°F (4°C to 37°C)
Battery Backup	Uses AA alkaline batteries (2)
Temperature Hold	Temporarily override schedule
Keypad Lock	Prevents unauthorized changes

Installation

Turn off power to HVAC system at circuit breaker. Remove old thermostat.

Label wires: Note wire labels (R, C, Y, G, W, O/B, etc.) from old thermostat.
Mount subbase: Secure new subbase to wall using provided screws.
Connect wires: Insert labeled wires into corresponding terminals on subbase.
Attach thermostat: Align and snap thermostat onto subbase.
Install batteries: Insert 2 AA alkaline batteries.
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 power restoration, thermostat will initialize. Follow prompts.

Set language: Default is ENGLISH.
Set time and day: Use arrows to set current time and day of week.
Select schedule type: Choose 7-day, 5+2-day, or non-programmable.
Set temperature limits: Configure heating and cooling setpoint ranges.
Configure system type: Select conventional or heat pump.
Test system: Run test cycle to ensure proper operation.

CAUTION! Ensure correct wire connections to prevent system damage.

Specifications

Model Series: ACONT800.
Power Source: 24VAC from HVAC system; battery backup (2 AA).
Display: Backlit LCD with temperature and status icons.
Temperature Control: 1°F (0.5°C) increments.
Compatibility: Single-stage and multi-stage heat/cool systems, including heat pumps.
Programming: Up to 4 periods per day (Wake, Leave, Return, Sleep).
Temperature Range: 40°F to 99°F (4°C to 37°C).
Operating Humidity: 0% to 90% RH non-condensing.
Warranty: 5-year limited warranty.

Controls and Settings

Access menu via MENU/SELECT button. Navigate with Up/Down arrows.

Front Panel: SYSTEM (mode), FAN, HOLD, PROGRAM, MENU/SELECT, Up/Down arrows.

System Modes: HEAT, COOL, AUTO, OFF. Fan Modes: AUTO (cycles with system), ON (continuous). Temperature Hold: Press HOLD to override schedule temporarily. Programming: Set Wake, Leave, Return, Sleep times and temperatures. Advanced Settings: Filter reminder interval, display brightness, temperature offset, keypad lock.

Connecting to HVAC System

Terminals: R (24V power), C (common), Y (cooling), G (fan), W (heating), O/B (heat pump reversing valve), etc.

Turn off HVAC power at circuit breaker.
Match wire labels to terminals on subbase.
For heat pump systems: Connect O/B wire per system configuration (O for cooling, B for heating).
For multi-stage systems: Connect Y2 (2nd stage cool) and/or W2 (2nd stage heat).

Tip: Refer to HVAC system manual for correct terminal designations.

Programming Schedules

Supports energy-saving schedules with up to 4 periods per day.

Press PROGRAM button.
Select day(s): All, Weekdays, Weekends, or individual days.
Set periods: Adjust Wake, Leave, Return, Sleep times and temperatures.
Copy schedule: Copy settings to other days.
Exit: Press MENU/SELECT to save and exit.
Override: Press HOLD for temporary override; press again to resume schedule.
Vacation mode: Set extended hold period via menu.

WARNING! Do not set extreme temperatures that could damage system or pipes.

Advanced Features

Filter Change Reminder: Set interval (30-365 days) in menu; icon appears when due. Keypad Lock: Enable in menu to prevent changes. Temperature Calibration: Adjust displayed temperature offset if needed. System Test: Run diagnostic to verify heating, cooling, and fan operation.

Care & Cleaning

Turn off power before cleaning. Use soft, dry cloth to clean display and casing. Do not use liquids or abrasive cleaners.

CAUTION! Do not spray cleaners directly on thermostat. Keep away from moisture and heat sources.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. UL Listed. Copyright © American Standard Heating & Air Conditioning. For support, visit www.americanstandardair.com or contact 1-800-428-4328.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Blank display	No power	Check circuit breaker; ensure wires connected; replace batteries.
System not turning on	Mode setting/wiring	Set correct mode (Heat/Cool); check wiring at thermostat and HVAC unit.
Incorrect temperature	Calibration/location	Adjust temperature offset; ensure thermostat not in direct sunlight or draft.
Schedule not following	Hold active/programming	Cancel HOLD; verify schedule times and temperatures.
Fan runs continuously	Fan setting	Set fan to AUTO mode; check G wire connection.

Reset: Remove batteries and disconnect power for 30 seconds to reset.

Service: 1-800-428-4328; www.americanstandardair.com