American Standard Thermostat ASYSTAT302C Manual

The American Standard ASYSTAT302C is a programmable digital thermostat designed for residential heating and cooling systems. It features a backlit LCD display, 7-day programming capability, automatic changeover between heating and cooling modes, temperature hold functions, system status indicators, and compatibility with most 24VAC HVAC systems. Below are key sections for safety, features, installation, programming, operation, and troubleshooting.

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

Features at a Glance

Key components: Backlit LCD display, Mode selection buttons, Fan control, Program/Schedule buttons, Temperature adjustment buttons, System status indicators.

Feature	Description
7-Day Programmable	Set different schedules for each day of the week
Automatic Changeover	Automatically switches between heating and cooling
Temperature Hold	Temporarily override programmed temperature
Backlit Display	Easy-to-read screen in low light conditions
System Status Indicators	LEDs show heating, cooling, or fan operation
Filter Change Reminder	Programmable reminder for HVAC filter maintenance
Battery Backup	Maintains settings during power outages
Keypad Lock	Prevents unauthorized programming changes
Adaptive Recovery	Learns system timing to reach set points efficiently
Compatibility	Works with most 24VAC heating/cooling systems

Installation

Turn off power to HVAC system before installation. Remove old thermostat carefully.

Mount backplate: Level and secure to wall using provided screws.
Connect wires: Match wire labels (R, W, Y, G, C, etc.) to terminal screws.
Attach thermostat: Align and snap onto backplate until it clicks into place.
Restore power: Turn HVAC system power back on at circuit breaker.
Install batteries: Insert 2 AA alkaline batteries for backup power.

WARNING! Always turn off power at circuit breaker before installation to prevent electrical shock or equipment damage.

First-Time Setup

After installation, configure basic settings for proper operation.

Set clock and day: Press CLOCK button, use arrows to set time and day.
Select temperature format: Choose Fahrenheit or Celsius in settings menu.
Configure system type: Set for conventional or heat pump system.
Program schedule: Set 4 periods per day (Wake, Leave, Return, Sleep).
Test operation: Verify heating and cooling systems respond correctly.

CAUTION! Ensure all wires are properly secured and not touching each other to prevent short circuits.

Specifications

Power Requirements: 24VAC from HVAC system; 2 AA battery backup.
Temperature Range: 40°F to 99°F (4°C to 37°C).
Display: Backlit LCD with temperature and system status.
Programming: 7-day, 4 periods per day programming capability.
Temperature Differential: 1°F (0.5°C) adjustable.
Compatibility: Conventional and heat pump systems (1H/1C).
Wiring Terminals: R, Rc, Rh, W, Y, G, O/B, C, AUX.
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 menus via MODE and SET buttons. Front Panel: Temperature display, MODE (Heat/Cool/Auto/Off), FAN (Auto/On), HOLD, MENU, arrows for adjustment.

Display Indicators: HEAT/COOL/FAN LEDs, battery icon, hold icon, filter reminder.

System Settings: Clock format (12/24 hr), temperature format (F/C), system type (conventional/heat pump), cycle rate, temperature differential. Programming: Set 4 periods per day with different temperatures for each day of the week. Energy Features: Adaptive recovery, filter change reminder interval, keypad lock.

Wiring Configuration

Standard wiring for most residential HVAC systems.

R/Rc/Rh: 24VAC power (connect per system type).
W/W1: Heat stage 1 (furnace or heat pump auxiliary heat).
Y/Y1: Cool stage 1 (compressor contactor).
G: Fan relay (indoor blower).
C: Common (24VAC return for powering thermostat).
O/B: Heat pump reversing valve (O for cooling, B for heating).
AUX: Additional heat stage or emergency heat.

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

Programming Schedule

Create energy-saving schedule with 4 periods per day.

Press PROGRAM button to enter programming mode.
Select day: Choose individual days or copy to other days.
Set Period 1 (Wake): Morning temperature for waking hours.
Set Period 2 (Leave): Energy-saving temperature when away.
Set Period 3 (Return): Comfort temperature when returning home.
Set Period 4 (Sleep): Nighttime energy-saving temperature.
Review schedule: Scroll through all days to verify settings.
Exit programming: Press DONE to save and return to normal operation.

WARNING! Do not set temperatures too extreme (below 55°F in winter or above 85°F in summer) to prevent pipe freezing or excessive energy use.

Energy Saving Features

Adaptive Recovery: Learns how long your system takes to reach temperature and starts early to meet schedule. Temperature Hold: Temporary override without affecting programmed schedule. Filter Change Reminder: Programmable interval (30-365 days) to maintain system efficiency.

Care & Maintenance

Clean display with soft, dry cloth only. Do not use liquids or cleaners. Replace batteries annually or when low battery icon appears. Check wiring connections periodically for corrosion or looseness.

CAUTION! Never spray cleaning fluids directly on thermostat. Turn off power before any maintenance involving wiring.

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 Heating & Air Conditioning. For support, visit www.americanstandardair.com or contact 1-800-228-2962.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Blank display	Power loss or dead batteries	Check circuit breaker; replace batteries; verify 24VAC at R and C terminals.
System not responding	Incorrect wiring or settings	Verify wiring matches system type; check mode setting (Heat/Cool/Auto).
Temperature inaccurate	Location or calibration	Relocate away from heat sources; access calibration in advanced settings.
Short cycling	Incorrect cycle rate setting	Adjust cycle rate in installer settings (typically 3-6 cycles per hour).
Fan runs continuously	Fan setting or relay stuck	Change fan setting from ON to AUTO; check G terminal wiring and relay.

Reset: Remove batteries, turn off power for 30 seconds, then restore to factory defaults.

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