American Standard Thermostat Enfield T373.730 Manual

The American Standard Enfield T373.730 is a programmable digital thermostat designed for residential heating and cooling systems. It features a backlit digital display, 7-day programming flexibility, automatic changeover between heating and cooling modes, system status indicators, and a built-in compressor protection delay. This manual covers installation, programming, operation, and troubleshooting for optimal HVAC control and energy efficiency.

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

Features at a Glance

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

Feature	Description
7-Day Programmable	Set different schedules for each day of the week
Automatic Changeover	Automatically switches between heating and cooling based on setpoint
Backlit Display	Easy-to-read screen with adjustable backlight timeout
System Status Icons	Indicators for Heat, Cool, Fan On/Auto, Hold, Battery
Compressor Protection	Built-in 5-minute delay to protect HVAC equipment
Temperature Display	Shows current room temperature and setpoint
Battery Backup	Uses 2 AA batteries to retain settings during power loss
Filter Change Reminder	Programmable alert to replace air filter
Fahrenheit/Celsius	Selectable temperature scale
Keypad Lock	Prevents unauthorized changes to settings

Installation & Wiring

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

Remove old thermostat: Label existing wires before disconnecting.
Mount new baseplate: Level and secure to wall using provided screws.
Connect wires: Match labeled terminals (R, C, W, Y, G, etc.) to corresponding wires.
Attach thermostat: Snap onto baseplate until it clicks into place.
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 restore, configure initial settings.

Set mode: Press MODE to select HEAT, COOL, AUTO, or OFF.
Set temperature: Use UP/DOWN arrows to adjust setpoint.
Set fan: Press FAN to select AUTO or ON continuous operation.
Set time and day: Hold SET button and use arrows to adjust.
Program schedule: Press PROGRAM to enter scheduling mode (see Section 6).
Configure preferences: Access installer settings by holding SET and MODE for 3 seconds.

NOTE: Default temperature range is 40°F to 99°F (4°C to 37°C).

Specifications

Power Supply: 24VAC from HVAC system; 2 AA battery backup.
Temperature Range: 40°F to 99°F (4°C to 37°C).
Setpoint Resolution: 1°F or 1°C.
Display: Backlit LCD with icons.
Compatibility: Single-stage conventional and heat pump systems (1H/1C).
Wiring Terminals: R, C, W, Y, G, O/B, Aux/E.
Operating Environment: 32°F to 122°F (0°C to 50°C); 0-90% RH non-condensing.
Dimensions: 3.5" H x 4.5" W x 1" D (89mm x 114mm x 25mm).
Warranty: 5-year limited warranty from date of purchase.

Controls and Display

Front Panel Buttons: MODE, FAN, UP arrow, DOWN arrow, HOLD, PROGRAM.

Display Icons: Flame (Heat), Snowflake (Cool), Fan (Blower), Clock (Schedule Active), Lock (Keypad Lock), Battery (Low Battery), Wrench (Filter Alert).

Basic Operation: Press MODE to cycle through OFF, HEAT, COOL, AUTO. Press FAN to toggle between AUTO and ON. Use UP/DOWN arrows to adjust temperature setpoint. Press HOLD to temporarily override programmed schedule. Press PROGRAM to view or edit schedule.

Programming Schedule

Create a 7-day schedule with up to 4 periods per day (Wake, Leave, Return, Sleep).

Press PROGRAM button to enter programming mode.
Use arrows to select day (MON, TUE, WED, THU, FRI, SAT, SUN, or ALL).
Select time period (Period 1, 2, 3, or 4).
Set start time using UP/DOWN arrows.
Set temperature for that period.
Repeat for each period and day.
Press PROGRAM to save and exit.

Tip: Copy schedule from one day to another by selecting the target day and pressing HOLD for 3 seconds.

Operating Modes

HEAT Mode: Controls furnace or heat pump in heating operation. System runs when room temperature falls below setpoint.

COOL Mode: Controls air conditioner or heat pump in cooling operation. System runs when room temperature rises above setpoint.

AUTO Mode: Automatic changeover. Thermostat automatically selects HEAT or COOL based on setpoint and room temperature.

OFF Mode: HVAC system is off. Fan can still be operated manually.

HOLD Function: Press HOLD to maintain current setpoint indefinitely, overriding schedule. Press HOLD again to resume program.

Advanced Settings

Access installer settings by holding SET and MODE buttons for 3 seconds. Use arrows to navigate.

CPH (Cycles Per Hour): Adjust heating and cooling cycles (3, 4, 5, or 6 CPH).
Temperature Offset: Calibrate displayed temperature (+/- 3°F).
Filter Timer: Set interval (30-365 days) for filter change reminder.
Keypad Lock: Enable/disable lock to prevent changes.
Backlight Timeout: Set duration (10, 20, 30 seconds, or Always On).
Fahrenheit/Celsius: Select temperature scale.
Factory Reset: Restore all settings to defaults.

CAUTION! Installer settings affect system performance. Record original settings before changing.

Care & Maintenance

Clean thermostat with soft, dry cloth. Do not use liquids or cleaners.

Replace batteries: When low battery icon appears, replace both AA batteries.
Reset filter timer: After replacing air filter, hold FAN button for 5 seconds to reset reminder.
Check wiring: Ensure connections are tight during seasonal inspections.

CAUTION! Turn off power before performing any maintenance on thermostat or HVAC system.

Regulatory Information

This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that it does not cause harmful interference. This thermostat is designed for use with 24VAC low-voltage systems only. Installation must comply with local electrical codes. American Standard is a trademark of American Standard Companies, Inc. For technical support, visit www.americanstandard.com or contact 1-800-843-0304.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Blank display	No power	Check circuit breaker; verify 24VAC at R & C terminals; replace batteries.
System not turning on	Incorrect mode or setpoint	Set mode to HEAT or COOL; adjust setpoint beyond room temperature.
Incorrect temperature reading	Location or calibration	Relocate away from heat sources; calibrate using temperature offset in settings.
Short cycling	CPH setting	Adjust Cycles Per Hour in installer settings (typically 3-6 CPH).
Fan runs continuously	Fan setting	Press FAN button to change from ON to AUTO.
Schedule not following	Hold active or time wrong	Press HOLD to resume schedule; verify correct time and day.
No heat/cool from heat pump	O/B setting reversed	In installer settings, change O/B terminal setting from O to B or vice versa.

Factory Reset: Hold SET and DOWN arrows for 5 seconds to restore defaults (erases all programming).

Service: 1-800-843-0304; www.americanstandard.com