American Standard Thermostat ASYSTAT605 Manual

The American Standard ASYSTAT605 is a programmable digital thermostat designed for residential heating and cooling systems. It features a backlit LCD display, 7-day programming capability, temperature hold functions, system mode selection (Heat/Cool/Auto/Off), fan control (Auto/On), and compatibility with most 24VAC single-stage 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 Tips 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Backlit LCD display, Mode buttons, Fan control, Up/Down temperature adjustment, Program/Schedule button, Hold button.

Feature	Description
LCD Display	Shows current temperature, set point, time, day, and system status
7-Day Programming	Allows separate schedules for each day of the week
Temperature Hold	Temporarily overrides programmed schedule
System Mode	Heat, Cool, Auto, or Off selection
Fan Control	Auto (runs with HVAC) or On (continuous)
Backlight	Illuminates display when buttons are pressed
Battery Backup	Uses 2 AA batteries to retain settings during power loss
Filter Change Alert	Reminder light indicates when to replace HVAC filter
Keypad Lock	Prevents unauthorized changes to settings
Temperature Range	40°F to 99°F (Heat), 50°F to 99°F (Cool)

Installation

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

Remove old thermostat: Label wires, disconnect from terminals.
Mount new baseplate: Level and secure to wall using provided screws.
Connect wires: Match labeled wires to corresponding terminals (R, W, Y, G, C, etc.).
Attach thermostat: Align and snap onto baseplate.
Install batteries: Insert 2 AA batteries for backup power.
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 initial settings.

Set time and day: Press CLOCK button, use arrows to adjust.
Select temperature format: Press MENU, navigate to UNITS, choose °F or °C.
Configure system type: In MENU > INSTALL, select appropriate system (Conventional or Heat Pump).
Set program schedule: See Programming section for details.
Test operation: Set mode to Heat or Cool, adjust temperature to verify system response.

CAUTION! Allow system to complete start-up cycle before adjusting settings.

Specifications

Power Requirements: 24VAC from HVAC system; 2 AA batteries for backup.
Display: Backlit LCD with temperature, time, and icons.
Programming: 7-day, 4 periods per day (Wake, Leave, Return, Sleep).
Temperature Control: 1°F resolution; adjustable within operating range.
Compatibility: Single-stage heating and cooling systems (gas, electric, oil).
Wiring Terminals: R, Rc, Rh, W, Y, G, C, O/B (for heat pump).
Operating Environment: 32°F to 122°F (0°C to 50°C); less than 85% humidity.
Dimensions: 5.5" H x 3.5" W x 1" D (approx.).

Controls and Settings

Front panel buttons: MODE (Heat/Cool/Auto/Off), FAN (Auto/On), UP/DOWN arrows, HOLD, MENU, CLOCK, PROGRAM.

Menu Navigation: Press MENU to access settings: CLOCK, SCHEDULE, INSTALL, PREFERENCES, FILTER ALERT.

Temperature Adjustment: Use UP/DOWN arrows to change set point. Hold Function: Press HOLD to maintain current temperature until canceled. Program Override: Press HOLD again to resume schedule. Keypad Lock: Press and hold MENU and DOWN arrow for 3 seconds to lock/unlock.

Wiring Configuration

Standard terminal designations for single-stage systems.

Terminal	Wire Color	Function
R / Rc	Red	24VAC Power (Cooling)
Rh	Red	24VAC Power (Heating)
W	White	Heat Stage 1
Y	Yellow	Cool Stage 1
G	Green	Fan Control
C	Blue/Black	Common (24VAC Return)
O/B	Orange	Heat Pump Reversing Valve

Tip: Refer to HVAC system manual or existing thermostat wiring for correct configuration.

Programming Schedule

Create a 7-day schedule to optimize comfort and energy savings.

Press PROGRAM button.
Select day: Use arrows to choose day (MON, TUE, etc.) or copy to all days.
Set periods: For each period (Wake, Leave, Return, Sleep), set time and temperature.
Navigate: Use NEXT to move between periods and days.
Save: Press PROGRAM again to exit and save automatically.

Example Schedule: Wake: 6:00 AM, 70°F; Leave: 8:00 AM, 62°F; Return: 5:00 PM, 68°F; Sleep: 10:00 PM, 65°F.

Energy Saving Tips

Utilize programmable features to reduce energy consumption.

Set back temperatures when away or asleep (recommended: 7-10°F difference).
Use Auto mode to let thermostat switch between Heat and Cool based on set points.
Keep fan in Auto mode unless continuous circulation is needed.
Replace HVAC filter regularly (use Filter Alert reminder).
Ensure thermostat is not exposed to direct sunlight or drafts for accurate readings.

Care & Cleaning

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

CAUTION! Avoid spraying cleaners directly on thermostat. Ensure unit is completely dry before restoring power.

Regulatory Information

FCC Part 15: Class B digital device; complies with limits for residential use. UL Listed. Copyright © American Standard Heating & Air Conditioning. For support, visit www.americanstandardair.com or contact customer service at 1-800-228-2962.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Blank display	Power loss / dead batteries	Check circuit breaker; replace AA batteries.
System not responding	Incorrect wiring / mode setting	Verify wiring connections; ensure mode is set to Heat or Cool.
Inaccurate temperature	Location / drafts	Relocate thermostat away from heat sources, windows, or vents.
Schedule not following	Hold active / programming error	Cancel HOLD function; review and reprogram schedule.
Fan runs continuously	Fan set to ON	Change FAN setting to AUTO.
Filter alert light on	Filter timer expired	Replace HVAC filter; reset alert in MENU > FILTER ALERT.

Reset: Remove batteries and disconnect from HVAC power for 30 seconds to restore factory defaults.

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