American Standard Thermostat Ceratherm T050120 Manual

The American Standard Ceratherm T050120 is a programmable digital thermostat designed for precise temperature control of heating and cooling systems. It features a backlit LCD display, 7-day programming capability, automatic changeover between heating and cooling modes, temperature hold functions, filter change reminder, and system status indicators. Compatible with most 24V HVAC systems including single-stage heat/cool, heat pump, and multi-stage configurations. Below are key sections for safety, features, installation, programming, operation, and troubleshooting.

Features at a Glance

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

Installation

Turn off power to HVAC system before installation. Remove old thermostat and prepare mounting location.

1. Turn off power: Switch off circuit breaker for HVAC system at main panel.
2. Remove old thermostat: Carefully disconnect wires and label them according to terminal markings.
3. Mount new baseplate: Use provided screws and level to ensure proper alignment.
4. Connect wires: Insert labeled wires into corresponding terminals on baseplate.
5. Attach thermostat: Align and snap onto baseplate until it clicks into place.
6. Restore power: Turn circuit breaker back on to power HVAC system.

WARNING! Electrical shock hazard. Always turn off power before installation. If unsure, consult qualified HVAC technician.

First-Time Setup

After installation, configure basic settings for proper operation.

1. Set date and time: Press MENU, navigate to CLOCK SETUP, enter current date and time.
2. Select temperature format: Choose between Fahrenheit (°F) or Celsius (°C).
3. Configure system type: Set for conventional or heat pump system in INSTALLER MENU.
4. Set temperature limits: Establish minimum and maximum temperature ranges.
5. Program schedule: Create initial heating and cooling schedule (see Programming section).

CAUTION! Ensure correct system type configuration to prevent equipment damage.

Specifications

• Power Requirements: 24V AC from HVAC system; 2 AA alkaline batteries for backup.
• Temperature Range: 40°F to 99°F (4°C to 37°C).
• Temperature Accuracy: ±1°F (±0.5°C).
• Display: Backlit LCD with 0.5" digits.
• Program Capacity: 4 periods per day (Wake, Leave, Return, Sleep).
• Compatibility: Single-stage and multi-stage heating/cooling systems, heat pumps with auxiliary heat.
• Wiring Terminals: R, Rc, Rh, W, W2, Y, Y2, G, O/B, C, L, AUX.
• Operating Environment: 32°F to 122°F (0°C to 50°C), 0-90% relative humidity non-condensing.
• Dimensions: 5.5" x 3.5" x 1" (140mm x 89mm x 25mm).

Controls and Settings

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

Display Icons: Flame (heating), Snowflake (cooling), Fan (blower on), Clock (schedule active), Hold (temperature override), Battery (low battery).

Basic Settings: Temperature adjustment (UP/DOWN arrows), Mode selection (Heat/Cool/Auto/Off), Fan control (Auto/Continuous). Advanced Settings: Program schedule, Filter timer, Temperature limits, Display brightness, Keypad lock, System configuration. Installer Menu: System type, Cycle rate, Temperature calibration, Equipment staging.

Wiring Configuration

Standard terminal designations and wiring connections for various HVAC systems.

Tip: Refer to HVAC equipment manual for specific wiring requirements. Take photo of old thermostat wiring before removal.

Programming Schedule

Create customized temperature schedules for energy savings and comfort.

1. Press PROGRAM button to enter programming mode.
2. Select day(s) to program: Individual days or copy to multiple days.
3. Set Wake period: Time and temperature for morning wake-up.
4. Set Leave period: Time and temperature for when occupants are away.
5. Set Return period: Time and temperature for when occupants return.
6. Set Sleep period: Time and temperature for nighttime.
7. Repeat for each day of the week as needed.
8. Press DONE to save and exit programming mode.

Energy Saving Tip: Program temperatures 7-10°F lower when away or sleeping in winter (reverse for summer cooling).

Advanced Functions

Filter Change Reminder: Set interval (30-365 days) in menu; reset after filter change. Temperature Hold: Press HOLD for temporary override; press again to cancel. Keypad Lock: Enable in menu to prevent unauthorized changes. Automatic Changeover: In Auto mode, thermostat selects heating or cooling based on setpoint. Adaptive Recovery: Learns how long system needs to reach setpoint and starts early.

Maintenance

Regular maintenance ensures optimal performance and accuracy.

1. Replace batteries: Install fresh AA alkaline batteries annually or when low battery icon appears.
2. Clean thermostat: Gently wipe display and case with soft, dry cloth.
3. Check calibration: Compare thermostat reading with accurate thermometer; recalibrate if needed.
4. Update filter reminder: Reset after each filter change.
5. Inspect wiring: Ensure connections are secure during seasonal system checks.

CAUTION! Do not use liquid cleaners or abrasives. Avoid direct sunlight or heat sources near thermostat.

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 technical support, visit www.americanstandard.com or contact 1-800-228-2962. This product may be covered by one or more patents. Installation should comply with local building codes and regulations.

Troubleshooting

Reset: Press and hold PROGRAM and UP arrow for 5 seconds to restore factory defaults (erases all programming).

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