American Standard Thermostat Trane VARIABLE SPEED II Manual

The American Standard Trane VARIABLE SPEED II Thermostat is a programmable digital thermostat designed for precise climate control with variable-speed HVAC systems. It features multi-stage heating and cooling compatibility, programmable schedules, adaptive recovery, humidity control, system status indicators, and a backlit display. 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 & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Digital backlit display, Mode buttons, Fan control, Program/Schedule buttons, System status LEDs, Wiring terminals.

Feature	Description
Multi-stage compatibility	Supports up to 2-stage heating and 2-stage cooling
Variable-speed control	Optimizes HVAC fan speed for efficiency and comfort
Programmable schedules	7-day programming with 4 periods per day
Adaptive recovery	Learns system performance to reach setpoints on time
Humidity display/control	Shows indoor humidity; compatible with humidifier/dehumidifier
Backlit display	Easy reading in low light
System status LEDs	Indicates heating, cooling, fan, or system alerts
Hold/temporary override	Manually override programmed temperature
Filter change reminder	Programmable alert for HVAC filter maintenance
Keypad lock	Prevents unauthorized changes to settings

Installation

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

Remove old thermostat: Label wires before disconnecting.
Mount new backplate: Level and secure to wall using provided screws.
Connect wires: Match labeled terminals (R, C, Y1, Y2, W1, W2, G, O/B, etc.).
Attach thermostat: Align and snap onto backplate.
Restore power at circuit breaker.

WARNING! Turn off HVAC system power before installation to prevent electrical shock or equipment damage.

First-Time Setup

Power on thermostat; follow initial configuration prompts.

Set language: Default is ENGLISH.
Configure system type: Select heat pump or conventional system.
Set stages: Define number of heating and cooling stages.
Set fan control: Auto or continuous circulation.
Program schedule: Set weekday/weekend schedules for energy savings.
Calibrate temperature: Verify reading matches room thermometer.

CAUTION! Incorrect wiring or configuration may cause system malfunction. Refer to HVAC system manual.

Specifications

Power: 24VAC from HVAC system; battery backup (optional AA batteries).
Compatibility: Multi-stage gas, electric, heat pump systems.
Temperature Range: 40°F to 99°F (4°C to 37°C).
Humidity Range: Display range 5% to 95% RH.
Programming: 7-day, 4 periods per day.
Display: Backlit LCD with Fahrenheit/Celsius option.
Wiring: Standard thermostat terminals (R, C, W1/W2, Y1/Y2, G, O/B, etc.).
Operating Temp: 32°F to 122°F (0°C to 50°C).

Controls and Settings

Access menus via MODE and MENU buttons. Front Panel: Temperature display, MODE (Heat/Cool/Auto/Off), FAN (Auto/On), HOLD, MENU, arrows, BACK.

Menu Navigation: SYSTEM SETUP, SCHEDULE, PREFERENCES, ALERTS.

System Setup: System type, stages, fan control, compressor protection. Schedule: Program times and temperatures for Wake, Leave, Return, Sleep. Preferences: Temperature units, backlight, keypad lock, filter reminder interval. Alerts: Filter change, system fault, low battery.

Connecting to HVAC System

Terminals: R (24V power), C (common), W1/W2 (heat stages), Y1/Y2 (cool stages), G (fan), O/B (heat pump reversing valve), etc.

Turn off HVAC system power.
Match thermostat wires to labeled terminals on backplate.
For heat pump: Set O/B orientation in SYSTEM SETUP menu.
For humidifier/dehumidifier: Connect to ACC terminals if equipped.

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

Programming Schedules

Create energy-saving schedules for weekdays and weekends.

Press MENU, select SCHEDULE.
Select day (Mon-Fri, Sat, Sun, or All).
Set times and temperatures for 4 periods: Wake, Leave, Return, Sleep.
Copy schedule to other days if desired.
Press BACK to save and exit.
Use HOLD for temporary override; press RUN SCHEDULE to resume.

Note: Adaptive recovery will start system early to reach setpoint by scheduled time.

Advanced Features

Adaptive Recovery: Enabled by default; learns system cycle times. Humidity Control: Connect humidistat; set desired humidity level in menu. Filter Reminder: Set interval (30-365 days); LED alert when due. Keypad Lock: Prevent changes; unlock via menu with installer code.

Care & Maintenance

Clean display with soft, dry cloth. Do not use liquids or abrasives. Replace backup batteries annually if used. Reset filter reminder after filter change.

CAUTION! Do not spray cleaning agents directly on thermostat.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. UL Listed. For HVAC system compatibility, consult installer or system manual. Copyright © American Standard Heating & Air Conditioning. For support, visit www.americanstandard.com or contact 1-800-448-3826.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Blank display	No power	Check circuit breaker; verify 24V at R and C terminals; install backup batteries.
System not turning on	Incorrect mode or wiring	Set MODE to Heat or Cool; verify wiring connections match system.
Incorrect temperature	Calibration or location	Recalibrate in menu; ensure thermostat is not near heat sources or drafts.
Schedule not following	Hold active or programming error	Press RUN SCHEDULE; review and reprogram schedule times.
Humidity not displaying	Sensor not connected or faulty	Check humidistat connection; replace if faulty.

Reset: Menu > Preferences > Factory Reset (requires installer code).

Service: 1-800-448-3826; www.americanstandard.com